A Stereo-Atlas of Ostracod Shells edited by J. Athersuch, D. J. Horne, D. J. Siveter, and J. E. Whittaker Volume 20, Part 2; 31st December, 1993 Published under the aegis of the British Micropalaeontological Society, London ISSN 0952-7451 Editors Dr J. Athersuch, StrataData Ltd., 16 Ottershaw Park, Ottershaw, Surrey KT16 OGQ. Dr D.J. Horne, School of Earth Sciences, University of Greenwich, Walburgh House, Bigland Street, London El 2NG. Dr David J. Siveter, Department of Geology, The University, Leicester LEI 7RH. Dr J.E. Whittaker, Department of Palaeontology, British Museum (Natural History), Cromwell Road, London SW7 5BD. Editorial Board Dr J.-P. Colin, Esso Production Research - European, 213 Cours Victor Hugo, 33321 Begles, France. Dr M.A. Ayress, Department of Geology, Australian National University, G.P.O. Box 4, Canberra, ACT 2601, Australia. Dr W. Hansch, Emst-Moritz-Amdt Universitat, Sektion Geologische Wissenschaften, F.L.-Jahnstr. 17a, 2200 Greifswald, Germany. Prof. R. Lundin, Department of Geology, Arizona State University, Tempe, Arizona 85287-1404, U.S.A. Dr R.E.L. Schallreuter, Universitat Hamburg, Geologisch-Palaontologisches Institut, Bundesstrasse 55, D 2000 Hamburg 13, Germany. Prof. N. Ikeya, Institute of Geosciences, Shizuoka University, Shizuoka 422, Japan. Officers of the British Micropalaeontological Society Chairman Professor A.R. Lord, Department of Geological Sciences, University College London, Gower Street, London WC1E 6BT. Secretary Dr J.B. Riding, British Geological Survey, Keyworth, Nottingham NG12 5GG. Treasurer Dr I.P. Wilkinson, British Geological Survey, Keyworth, Nottingham NG12 5GG. Journal Editor Dr M.C. Keen, Department of Geology, The University, Glasgow G12 8QQ. Newsletter Editor Dr A.J. Powell, Millenia Ltd., Unit 3, Weyside Park, Newman Lane, Alton, Hampshire GU34 2PJ. Conodont Group Chairman Dr J.J. Stone, Department of Geology, Trinity College, Dublin 2, Ireland. Conodont Group Secretary Dr S.J. Tull, Cambridge Arctic Shelf Programme, West Building, Gravel Hill, Huntington Road, Cambridge CB3 0DJ. Foraminifera Group Chairman Dr M.D. Simmons, BP Exploration Operating Company Ltd., 4/5 Long Walk, Stockley Park, Uxbridge, Middlesex UB11 IBP. Foraminifera Group Secretary Dr S.R. Packer, Millenia Ltd., Unit 3, Weyside Park, Newman Lane, Alton, Hampshire GU34 2PJ. Ostracod Group Chairman Dr N.R. Ainsworth, Paleo Services Ltd., Unit 15, Paramount Industrial Estate, Sandown Road, Watford WD2 4XA. Ostracod Group Secretary Dr I.D. Boomer, Institute of Earth Studies, The University of Wales, Penglais, Aberystwyth, Dyfed SY23 3DB. Palynology Group Chair Professor D.J. Batten, Institute of Earth Studies, The University of Wales, Penglais, Aberystwyth, Dyfed SY23 3DB. Palynology Group Secretary Dr A. McNestry, British Geological Survey, Keyworth, Nottingham NG12 5GG. Calcareous Nannofossil Group Chairman Dr L.T. Gallagher, Paleo Services, Unit 15, Paramount Industrial Estate, Sandown Road, Watford WD2 4XA. Calcareous Nannofossil Group Secretary Dr N.M. Hine, British Geological Survey, Keyworth, Nottingham NG12 5GG. Instructions to Authors Contributions illustrated by scanning electron micrographs of Ostracoda in stereo-pairs are invited. Format should follow the style set by the papers in this issue. Descriptive matter apart from illustrations should be cut to a minimum; preferably each plate should be accompanied by only one page of text. Blanks to aid in mounting figures for plates may be obtained from any one of the Editors or Editorial Board. Completed papers should be sent to one of the Editors. All contributions submitted for possible publication in the Stereo-Atlas of Ostracod Shells are reviewed by an appropriate international specialist. The front cover shows a male left valve (upper) and a female right valve (lower) of Euryholhina bispinata (Harris, 1957) from the middle Ordovician Edinburg Formation of Virginia, U.S.A. British Museum (Natural History), nos. OS 14028 and OS 13536 respectively. Photographed by M. Williams and C. Giles Miller. A Stereo-Atlas of Ostracod Shells edited by J. Athersuch, D. J. Horne, D. J. Siveter, and J. E. Whittaker Volume 20, 1993 Part 1 (pp. 1-62); 31st August, 1993 Part 2 (pp. 63-127); 31st December, 1993 Published under the aegis of the British Micropalaeontological Society, London Stereo- Atlas of Ostracod Shells 20, ii Contents Contents 1 On Cyiheromorpha diamphidia Maybury sp. nov.; by C.A. Maybury. 1 2 On Semicytherura paraclausi Maybury sp. nov.; by C.A. Maybury. 5 3 On Kiltsiella rosensteinae (Sarv); by D.J. Siveter & L.I. Sarv. 9 4 On Sulcella huecoensis Dewey & Kohn sp. nov.; by C.P. Dewey & P. Kohn. 13 5 On Nipponocy there colalongoae (Ciampo); by V. Drapala & M.A. Ayress. 17 6 On Nipponocythere cuneata Ayress & Correge sp. nov.; by M.A. Ayress & T. Correge. 25 7 On Kuiperiana dryppa (Whatley & Cole); by M.A. Ayress & V. Drapala. 29 8 On Aboilia blessi Becker & Adamczak gen. et sp. nov.; by G. Becker & F.F. Adamczak. 33 9 On Baltonotella elegans (Harris); by M. Williams & J. Vannier. 37 10 On Kayina hybosa Harris; by M. Williams & J. Vannier. 41 11 On Punctoschmidtella pauciperforata (Harris); by M. Williams & J. Vannier. 45 12 On Wenlockiella phillipsiana (Jones & Holl); by R.F. Lundin & L.E. Petersen. 49 13 On Parulrichia diversa (Jones & Holl); by D.J. Siveter & R.F. Lundin. 55 14 On Parulrichia bispinosa Lundin & Siveter sp. nov.; by R.F. Lundin & D.J. Siveter. 59 15 On Asiacicatricula varia (Michailova); by D.J. Siveter, E.D. Michailova & A.F. Abushik. 63 16 On Malguzaria sarvi Michailova; by D.J. Siveter, E.D. Michailova & A.F. Abushik. 67 17 On Anabarochilina primordialis (Linnarsson); by D.J. Siveter, M. Williams, A.F. Abushik, V. Berg-Madsen & L. Melnikova. 71 18 On Cryptophyllus nuculopsis Harris; by M. Williams. 77 19 On Neoamphissites costatus Becker & Wang; by G. Becker & Wang Shang-qi. 81 20 On Sinabairdia nodosa Becker & Wang; by G. Becker & Wang Shang-qi. 85 21 On Tuberoscapha obesa Becker & Wang; by G. Becker & Wang Shang-qi. 89 22 On Bulbosohnia bolboformis Becker & Wang; by G. Becker & Wang Shang-qi. 93 23 On Semicytherura curvicauda Maybury sp. nov.; by C.A. Maybury. 97 24 On Loxocorniculum multireticulatum Maybury sp. nov.; by C.A. Maybury. 101 25 On Trachyleberis bathymarina sp. nov.; by M.A. Ayress. 105 26 On Pseudulrichia albraca Schallreuter & Lehnert sp. nov.; by R.E.L. Schallreuter & O. Lehnert. 109 27 On Lodesia adiastola Schallreuter & Lehnert gen. et sp. nov.; by R.E.L. Schallreuter & O. Lehnert. 113 28 On Eopilla ingelorae Schallreuter gen. et sp. nov.; by R.E.L. Schallreuter. 117 29 On Eodominina nuela Schallreuter gen. et sp. nov.; by R.E.L. Schallreuter. 121 30 Index for Volume 20, (1993). 125 Stereo-Atlas of Ostracod Shells 20 (15) 63-66 (1993) Asiacicatricula varia (1 of 4) 595.336.11 (1 13.331) (575.1 : 161.66.40): 551.351 ON ASIACICATRICULA VARIA (MICHAILOVA) by David J. Siveter, Elena D. Michailova & Anna F. Abushik (University of Leicester, England; Institute of Mining, St. Petersburg, Russia; All-Russian Geological Research Institute, St. Petersburg) Derivation of name: Diagnosis: Remarks: Genus Asiacicatricula gen. nov. Type-species: Saccarchites varius Michailova, 1971 Latin Asia + cicatricula, feminine diminutive of “scar”; referring to its geographical occurrence and dolonoid scar. Gender: feminine. Craspedobolbinine with obsolete lobation; lateral surface of valves more or less gently convex overall except for flattened area adjacent to anterior cardinal corner. Velum seemingly obsolete; position represented merely by a bend at margins of lobal area. Marginal ridge narrow, rounded at edge, occurs between cardinal corners; separated from lobal area by narrow groove. Crumina elongate, primarily anteroventral, almost completely assimilated within domicilium, hangs just below ventral margin of valve in lateral view; dolonoid scar well developed, long, straight. Weakly developed tubercles irregularly scattered over valve surface; crumina smooth. The beyrichiacean Family Craspedobolbinidae Martinsson, 1962 embraces those species which primarily have tubular structures in the velum (occasionally they may be reduced) and a crumina which originates by invasion of the velar tubules, thus leaving traces of a dolonoid pouch closing mechanism in the form a dolonoid scar (Craspedobolbininae) or a velar edge deflection on the crumina (Amphitoxotidinae). Saccarchites lacks a dolonoid scar (Martinsson 1963, op. cit., 52). The typical craspedobolbinine dolonoid scar in Asiacicatricula (PI. 20, 64, figs. 3, 4; PI. 20, 66, fig. 4) not only clearly indicates its taxonomic affinity but it also implies that the homalogue to the (obsolete) velum must be the bend forming the margin to the lobes in lateral view and that the uninterrupted ridge below the crumina must, therefore, be interpreted as a marginal ridge. The alternative explanation (i.e. that the “marginal ridge” is really the velum) would imply that a dolonoid scar could develop as a result of metamorphosis of part of the lobal area, a phenomenon counter to all known data relating to the formation of the crumina in the Beyrichiacea. Explanation of Plate 20, 64 Figs. 1-3, 9 RV (203/267, 2300 pm long): fig. 1, ant.; fig. 2, ext. lat . ; fig. 3, vent. Figs. 4, 5, 9 RV (204/267, 2250/ym long): fig. 4, obi. vent.; fig. 5, ext. lat. Scale A (500 /tm; x22), figs. 1-3; scale B (500 pm; x22), figs. 4, 5. Stereo-Atlas of Ostracod Shells 20, 65 Asiacicatricula varia (3 of 4) Thus, Asiacicatricula differs fundamentally from other members of the family in that it lacks a velum as such and it has a crumina which is almost completely assimilated within the domicilium. All beyrichiacean subfamilies show a simplification of the beyrichiacean carapace (e.g. obsoletion of the lobes and a reduction of the velum) in their advanced stock (e.g. Martinsson, A., 1962, 1963, Bull. geol. Instn Univ. Uppsala , 41, 1-369 & 42, 1-63 respectively). This trend is clearly confirmed herein in Asiacicatricula, a member of the most primitive subfamily. The simplified, “advanced” beyrichiaceans are often of upper Palaeozoic age and their distinction, if any, from taxa that have traditionally been referred to as Paraparchitacea ( sensu Scott, H., 1961, Treatise on Invertebrate Paleontology, Univ. Kansas Press) and Apar- chitacea (e.g. sensu Rozhdestvenkaja, A. A., 1972, Ostracodes from the Upper Devonian of Bashkiria, Acad. Nauk, S.S.S.R., Bashkirian Fil. Inst. Geol., 194pp) is difficult and needs to be resolved (e.g. see Becker, G. et at. 1974, Meded. Rijks. geol. Diest. (N.S.), 25, 19; Abushik, A.F., 1990, In: Abushik, A.F. et al., Practical Manual on microfauna of U.S.S.R., 4, Palaeozoic Ostracoda, 103. Min. Geol. U.S.S.R. All-Union Geol. Res. Instit. Nedra, Leningrad). 1 97 1 Saccarchites Holotype. Type locality: Figured specimens: Diagnosis. Remarks. Distribution Ackno w ledge men t. Asiacicatricula varia (Michailova, 1971) varius sp. nov., E.D. Michailova, Sci. Notes Instit. Mines Leningrad, 59 (2), 123, pi. 1, figs. 1-4, pi. 3, fig. 4. Museum collections, Institute of Mines, St Petersburg, Russia, no. 3/267; female right valve. About 200 m NW of Kanda village, Merishkor Mountain, S slope of N Nuratau Ridge, Uzbekistan, central Asia; lat. 40°30'N, long. 66°45,E. Fljdynsai Beds, Merishkor Horizon, upper part of Wenlock Series, Silurian. Museum collections, Institute of Mines, St. Petersburg, nos. 200/267 (tecnomorphic LV: PL 20, 66, fig. 5), 201/267 (tecno- morphic LV: PI. 20, 66, fig. 6), 202/267 (cr RV: PI. 20, 66, figs. 1-3), 203/267 (9 RV: PI. 20, 64, figs. 1-3, PI. 20, 66, fig. 4), 204/267 (9 RV: PI. 20, 64, figs. 4, 5). Specimen 202/267 is from sample 109/9; all of the other figured valves are from sample 106/5. All from the type section; collected by Michailova. As for the genus, which is monotypic. In the central lateral part of the lobal area a small, smooth, ovoid spot is very faintly discernable in some specimens (PI. 20, 64, fig. 2, PI. 20, 66, fig. 1). This may represent an adductorial muscle spot, a feature known from several beyrichiaceans such as Saccarchites Swartz & Whitmore, 1956, Myomphalus Swartz & Whitmore, 1956, and Bolbineossia Kesling et al., 1958. Hjdynsai Beds and their lateral equivalents, Wenlock Series, Silurian, Uzbekistan, central Asia. Three localities near Kanda (see type locality); one locality 1 km downstream from Matcha village, left bank of River Isfara, N slope of Turkistan Range; one locality in the Kyzyl-Kum Hills, Tamdytau Range. The Royal Society and NATO are thanked for their support. Explanation of Plate 20, 66 Figs. 1-3, cr RV (202/267, 2500 pm long): fig. 1, ext. lat.; fig. 2, post.; fig. 3, vent. Fig. 4. 9 RV, obi. vent, detail of crumina showing dolonoid scar (203/267). Fig. 5, tecnomorphic LV, ext. lat. (200/267, 1700 gm long). Fig. 6, tecnomorphic LV, ext. lat. (201/267, 1250//m long). Scale A (500 pm; x20), figs. 1-3; scale B (100 /ym; x65), fig. 4; scale C (300 /tm; x25), fig. 5; scale D (300 /tm; x28), fig. 6. Asiacicatricula varia (2 of 4) Stereo-Atlas of Ostracod Shells 20, 66 Stereo-Atlas of Ostracod Shells 20, 64 Asiacicatricula varia (4 of 4) Stereo-Atlas of Ostracod Shells 20 (16) 67-70 (1993) Malguzaria sarvi (1 of 4) 595.336.11 (113.333) (575.1 : 161.68.39): 551.351 ON MALGUZARIA SARVI MICHAILOVA by David J. Siveter, Elena D. Michailova & Anna F. Abushik (University of Leicester, England; Institute of Mining, St. Petersburg, Russia; All-Russian Geological Research Institute, St. Petersburg) Genus MALGUZARIA Michailova, 1972 Type-species (by original designation): Malguzaria sarvi Michailova, 1972 Diagnosis: Beyrichiacea having both torus and edge of velum as straight, parallel ridges across to anterior part of crumina. Three well developed lobes; syllobium divided dorsally by curved sulcule, also has a narrow, shallow sulcus parallel and near to its posterior margin. Lobal area and crumina have fine striation/reticulo-striation; lateral part of crumina also has c. 20 short, narrow ridges. Supersulcal tubercle present, above preadductorial node. Tecnomorphs have anteroventral pit/depression. Velum appears merely as right-angle bend between lobal area and adventral parts of valve. Marginal area wide, flange-like, in lateral view. Remarks: Michailova (1972) placed this genus in the subfamily Amphitoxotidinae, but the Russian Practical Manual on Microfauna (Abushik, 1990) questioned such an assignment. The subfamilial/familial assignment of Malguzaria within the superfamily Beyrichiacea is, indeed, difficult to resolve. Anteroventral depressions are prominent in both amphitoxotidines (Craspedobolbinidae) and beyrichiines (Beyrichiidae). Indeed, in having a marked anteroventral depression, reticulo-striate ornament, and (two) ridges over the crumina Malguzaria recalls many amphitoxotidine genera such as Huntonella Lundin, 1968, Sarmatotoxotis Siveter, 1980 and Hogburgiella and Lophoctenella (both Martinsson, 1962). However, Malguzaria differs fundamentally from craspedobolbinids in lacking a well developed, tubulous velum. This difference is based on our interpretation of the lateroventral bend (i.e. that bend of the shell between the latero-lobal and contiguous adventral surfaces) and the ventrally adjacent ridge (PI. 20, 68, figs. 4, 5), both of which cross the crumina, as homologues of the velum and torus of other beyrichiaceans. This homology implies that the relatively wide flange which flanks the lobal area is a marginal flange, not a velum. Explanation of Plate 20, 68 Figs. 1-6, o' RV (50/268; 1080/rm long): fig. 1, ant.; fig. 2, ext. lat . ; fig. 3, post.; fig. 4, obi. vent.; fig. 5, vent.; fig. 6, ornament on syllobium. Scale A (250/rm; x45), figs. 1-5; scale B (50 ^m; x 175), fig. 6. Stereo-Atlas of Ostracod Shells 20, 69 Malguzaria sarvi (3 of 4) The marginal flange and type of ornament of Malguzaria is more akin to similar features in various “atypical beyrichiids” (see A. Martinsson, Bull. geol. Instn Univ. Uppsala 41, 347, 1962 & 42, 19, 1963 respectively; and J. Berdan, Prof. Pap. U.S. geol. Surv. 730, 24-26, 1972), such as Psuedobeyrichia Swartz & Whitmore, 1956 and Bingeria Martinsson, 1962. Those groups of beyrichiid-like forms which lack any kind of velar ridge or velar bend but which have a flange-like marginal structure were distin- guished by Abushik (In: Abushik, A.F., Gusseva, E.A. & Zanina, I.E. Palaeozoic ostracodes from key sections in the European part of the U.S.S.R., 81, 1971, Nauka, Moscow) as the family Wellerellidae. Pending a thorough first-hand revision of such forms, many of which are North American genera, at present we prefer not to assign Malguzaria to a beyrichiacean higher taxon. 1972 1981 1990 Malguzaria sarvi Michailova, 1972 Malguzaria sarvi sp. nov., E.D. Michailova, Notes Instit. Mines Leningrad, 63 (2), 34, pi. 1, figs. 1-3. Malguzaria sarvi Michailova; E.D. Michailova, Sci. Notes All-Union Paleont. Soc., 24, 129, fig. 2, 130, fig. 3. Malguzaria sarvi Michailova; A.F. Abushik, In: A.F. Abushik et al.. Practical Manual on microfauna of U.S.S.R., 4, Palaeozoic Ostracoda, 88, pi. 27, figs. 6-8. Ministry Geol. U.S.S.R. All-Union Geol. Res. Instit. Nedra, Leningrad. Holotype: Museum collections, Institute of Mines, St. Petersburg, Russia, no. 5/268; female carapace. Section in left bank of the Ettkitchu River, 0.5 km upstream from Myk village, Malguzar Range, South Tien-Shan, Uzbekistan, central Asia; lat. 39°45'N, long, 68°30'E. Isfara horizon, Pridoli Series, Upper Silurian. Museum collections. Institute of Mines, St Petersburg, nos. 50/268 (cr RV: PI. 20, 68, figs. 1-6), 51/268 (9 RV: PI. 20, 70, figs. 4, 6), 52/268 (9 RV: PI. 20, 70, figs. 1-3, 5), 53/268 (9 cara. crumina only: PI. 20, 70, fig. 8), 54/268 (tecnomorphic LV: PI. 20, 70, fig. 7). All from the type section; collected by Michailova. As for the genus, which is monotypic. The anteroventral depression of M. sarvi undergoes a marked ontogenetic transformation and in all but the smallest tecnomorphs its morphology is unlike any other species within the Beyrichiacea. In adult tecnomorphs it forms a shallow pit actually within the anteroventral lobal area (PI. 20, 68, figs. 1, 2, 4, 5). In smaller tecnomorphs it is a relatively deeper, more prominent, but still enclosed depression (PI. 20, 70, fig. 7). In the smallest juveniles examined (two valves in Michailova coll., Inst. Mines, St. Petersburg; not figured) this depression is positioned at the anteroventral margin of the lobal area and (typical of all other beyrichiaceans having this feature) its anteroventral part is not enclosed by the lobal area. Known only from the type locality, Uzbekistan, central Asia. The Royal Society and NATO are thanked for their support. Type locality: Figured specimens: Diagnosis: Remarks: Distribution: Ackno w l edge men t: Explanation of Plate 20, 70 Figs. 1-3, 5, 9 RV (52/268; estimated 1100 pm long); fig. 1, ant.; fig. 2, ext. lat.; fig. 3, vent.; fig. 5, ornament on crumina. Figs. 4, 6, 9 RV (51/268; 1375 pm long): fig. 4, ext. lat.; fig. 6, post. Fig. 7, tecnomorphic LV, ext. lat. (54/268; 810/rm long). Fig. 8, 9 cara., ext. vent, of crumina (53/268). Scale A (250 gm; x45), figs. 1-3, 7, 8; scale B (50//m; x200), fig. 5; scale C (250 //m; X 36), figs. 4, 6. Malguzaria sarvi (2 of 4) Stereo-Atlas of Ostracod Shells 20, 68 Stereo-Atlas of Ostracod Shells 20, 70 Malguzaria sarvi (4 of 4) Stereo-Atlas of Ostracod Shells 20 (17) 71-76 (1993) Anabarochilina primordialis (1 of 6) 595.330 (113.23) (420 : 162.001 .52 + 485 : 161 .013.58 + 57 : 161.106.72): 551.351 +552.54 ON ANABAROCHILINA PRIMORDIALIS (LINNARSSON) by David J. Siveter, Mark Williams, Anna F. Abushik, Vivianne Berg-Madsen & Ludmila Melnikova (University of Leicester, England; All-Russian Geological Research Institute, St. Petersburg; University of Uppsala, Sweden; Palaeontological Institute, Moscow) Genus ANABAROCHILINA Abushik, 1960 Type-species: Leperditia primordialis Linnarsson, 1869 (senior subjective synonym of Anabarochilina ventriangulosa Abushik, 1960 and type-species of Svealuta Opik, 1961) 1960 Anabarochilina gen. nov., A.F. Abushik, Vest. Leningr. gos. Univ., (Geol.), 1960, (6), 96. 1961 Svealuta gen. nov., A. A. Opik, Bull. Bur. Miner. Resour. Geol. Geophys. Aust. 53, 174. Diagnosis: Large, subamplete bradoriids (?); lateral valve surface characteristically smooth and convex. Marginal rim continuous ventrally, posteriorly and dorsally; demarcated from lateral surface by furrow. Up to three nodes, situated in mid-anterior to anterodorsal region. Remarks: Jones & McKenzie (1980, 207) thought that Anabarochilina differs from Svealuta in having its anterodorsal-most node (Nl) continuous with the rim of the dorsal margin. Based on comparison of their respective type-species we consider that these genera are synonymous. Jones & McKenzie (1980) referred Anabarochilina to the Bradoriina Raymond, 1935, a taxon which they held to be a heterogeneous group of ancestral ostracods and other bivalved crustaceans. In size and overall morphology we consider that Anabarochilina is at least superficially similar to many leperditicopiids (e.g. see Berdan, J. M., Prof. Pap. U.S. geol. Surv., 1066-j, 1984). Exfoliated specimens of A. primordialis reveal a network of fine anastomosing lines diverging from the posterior side of N3 (PI. 20, 72, fig. 1; PI. 20, 74, fig. 1); lines of similar appearance occur in many Explanation of Plate 20, 72 Figs. 1-3, RV (8663, 11.90 mm long); fig. 1, ext. lat.; fig. 2, vent.; fig. 3, dors. Fig. 4, RV ext. lat. (BDA 2313, 8.30 mm long). Scale A (2000 /tm; x5), figs. 1-3; scale B (1500 /rm; x7), fig. 4. Stereo-Atlas of Ostracod Shells 20, 73 Anabarochilina primordialis (3 of 6) leperditicopiids (Berdan 1984, 12, pi. 6, fig. 13, pi. 8, figs. 3, 5), where they originate from the adductor muscle scar region and have been interpreted as possible impressions of a muscular structure. The hinge structures of Anabarochilina are unknown. The suggestion that its valves were possibly joined at the dorsum without a hinge line (Jones & McKenzie 1980) is not supported by the fact that disarticulated valves of A. primordialis from Scandinavia show well defined straight dorsal margins (hinge line ?). Distribution: Late middle Cambrian of southern Britain, Scandinavia and Australia and early upper Cambrian of Russia. Anabarochilina primordialis (Linnarsson, 1869) 1868 Leperditia sp. ; J.G.O. Linnarsson, Ofvers. K. VetenskAkad. Forh. Stockh., 1868 (1), 54. 1869 Leperditia primordialis, n. sp., J.G.O. Linnarsson, K. svenska. VetensAkad. Handl., 8 (2), 84, pi. 2, figs. 65, 66. 1869 Leperditia (Isochilina) primordialis n. sp., J.G.O. Linnarsson, Ofvers. K. VentenskAkad. Forh. Stockh., 1869 (2), 196. 1875 Leperditia primordialis Linrs.; J.G.O. Linnarsson, Ofvers. K. VetensksAkad. Forh. Stockh., 1875 (5), 45. 1895 “Leperditia” primordialis Linrs.; I.D. Wallerius, Undersokningar dfver zonen med Agnostus laevigatus / Vestergotland, 62, Lund. 1902 “Leperditia” primordialis Linnarsson; K.A. Gronwall, Danm. geol. Unders., (ser. 2), 13, 162. 1910 L. primordialis', A.H. Westergard, Acta. Univ. fund., (N.F.2), 6, 5. 1924 Aristozoe primordialis Linnss.; E. Kummerow, Jb Preuss. geol. Landesanst., 44, 445. 1928 Aristozoe (?) primordialis (Linrs.); A.H. Westergard, Geol. For. Stockh. Forh., 50, 198. 1929 Leperditia primordialis Lin.; G. Giirich, Mitt, miner. -geol. Stlnst. Hamb., 11, 43. 1930 Aristozoe (?) primordialis (Linrs.); I.D. Wallerius, Geol. Fur. Stockh. Forh., 50, 57. 1931 Alula primordialis (Linnarsson); E.O. Ulrich & R.S. Bassler, Proc. U.S. nat. Mus., 78 (4), 59, pi. 8, figs. 11, 12. 1931 Aristozoe (“Leperditia”) primordialis Linn.; E. Kummerow, Zentbl. Miner. Geol. Palaont., (Abt. B), 1931, 253, fig. 15. 1940 Alula primordialis (Linrs.); A.H. Westergard, Sveriges. geol. Unders., C 437, 12, 14, 26, 48, 49, 66. 1944 Alula primordialis-, A.H. Westergard, Sveriges geol. Unders., C 459, 33. 1960 Anabarochilina ventriangulosa sp. nov., A.F. Abushik, Vest. Leningr. gos. Univ. (Geol.), 1960, no. 6, 97, figs. 2-4. 1960 Anabarochilina ventriarcuata sp. nov., A.F. Abushik, Vest. Leningr. gos. Univ., (Geol.), 1960, no. 6, 98, figs. 5, 6. 1961 Svealuta primordialis (Linnarsson); A. A. Opik, Bull. Bur. Miner. Resour. Geol. Geophys. Aust., 53, 174, fig. 58. Explanation of Plate 20, 74 Fig. 1, RV ext. lat. (8662, 8.89 mm long). Fig. 2, LV ext. lat. (holotype of Leperditia primordialis, 5322, 9.25 mm long). Fig. 3, LV ext. lat. (holotype of Anabarochilina ventriangulosa, N 4342/60, 10.00 mm long). Fig. 4, RV ext. lat. (holotype of Anabarochilina ventriarcuata , damaged anteriorly, N4342/62, 11.10mm long). Scale A (1500 gm; x7), figs. 1, 2; scale B (1500 pm; x6) fig. 3; scale C (2000 pm; x5), fig. 4. Stereo-Atlas of Ostracod Shells 20, 74 Anabarochilina primordialis (4 of 6) Stereo-Atlas of Ostracod Shells 20, 75 Anabarochilina primordialis (5 of 6) 71961 Anabarochilina sp. M. aff. /I. primordialis (l.lnnarsson); A. A. Opik, Bull. Bur. Miner. Resour. Geol. Geophys. Aust., 53, 174, pi. 24, figs. la-e. 1964 Aluta primordialis (Linnarsson); K.J. Muller, N. Jb. Geol. Palaont. Abh., 121 (1), 4. 1978 Svealuta primordialis (Linnarsson); A.W.A. Rushton, Palaeontology, 21, 278, pi. 26, fig. 8. 1980 Leperditia primordialis Linnarsson; P.J. Jones & K.G. McKenzie, Alcheringa, 4, 207. 71985a Svealuta primordialis-, V. Berg-Madsen, Acta Univ. Upsaliensis, (Abstr. Uppsala Dissertations, Faculty Science), 781, 30, fig. 5H. 1985b Svealuta primordialis-, V. Berg-Madsen, Bull. geol. Soc. Denmark, 34, 171. Holotype: Type locality: Figured specimens: Diagnosis: Remarks: Sveriges Geologiska Undersokning, Uppsala, Sweden, no. 5322; left valve. Late middle Cambrian Lejopyge laevigata Zone, Blinningsberg, near Falkoping, Vastergotland, Sweden; lat. 58°10'N, long. 13°33'E. Sveriges Geologiska Undersokning, Uppsala, nos. 8663 (RV: PI. 20, 72, figs. 1-3), 8662 (RV: PI. 20, 74, fig. 1), and 5322 (holotype of Leperditia primordialis LV: PI. 20, 74, fig. 2). British Geological Survey, Keyworth, England, no. BDA 2313 (RV: PI. 20, 72, fig. 4). Palaeontological Institute, Academy of Sciences, Moscow, nos. N 4342/60 (holotype of Anabarochilina ventriangulosa, LV: PL 20, 74, fig. 4). Specimen no. 5322 is from the type horizon and locality; 8662 and 8663 are from the middle Cambrian L. laevigata Zone, Djopadalen (between Torbjorntorp and Gudhem), Vastergotland, Sweden. BDA 2313 is from the L. laevigata Zone, Mancetter Grits and Shales Formation, Merevale borehole no. 3, at depth 198.82 m, Nuneaton area, England (see Taylor, K. & Rushton, A.W.A. , Bull. geol. Surv. Gt Br., 35, 1971). N 4342/60 and N 4342/62 are from the Aijusakan stage, early upper Cambrian, vicinity of the River Kotui, E. Siberia. Species of Anabarochilina with three mid-anterior to anterodorsally situated nodes separated by furrows. N1 low relief, subtriangular in dorsal profile, continuous with dorsal part of marginal rim. N2 subrounded and markedly convex, in lateral view projects over anterior part of marginal rim. N3 low relief, situated immediately behind N2. Marginal rim wider and pointed mid-posteriorly. Part 3 of Angelin’s Palaeontologica Scandinavica was never published but several of the plates were printed and privately distributed in 1854 and 1860 (see Spjeldnaes, N., Geol. For. Stockh. Forh., 88, 407, 1966). These include Plate A, which has the earliest known illustrations (figs. 9a-c; left and right valves) of A. primordialis. We consider that Leperditia primordialis Linnarsson, 1869, Anabarochilina ventriarcuata Abushik, 1960 and Anabarochilina ventriangulosa Abushik, 1960 are all synonymous; holotypes of all three taxa are illustrated herein. We think that Anabarochilina sp. M. aff. A. primordialis of Opik (1961), which was based on a single anteriorly incomplete right valve from the late middle Cambrian of Australia, might also be conspecific with A. primordialis. Opik misinterpreted (1961, fig. 58) the morphology of A. primordialis in not recording the presence of N3 or the continuous nature of N1 with the dorsal part of the marginal rim. Opik (1961) also stated that A. primordialis was abundant in the middle Cambrian Solenopleura brachymetopa Zone in Sweden, but we know Stereo-Atlas of Ostracod Shells 20, 76 Anabarochilina primordialis (6 of 6) Distribution: Acknowledgements: of no firm supporting evidence for that supposed occurrence. Moreover, he made no reference to its confirmed occurrence in the overlying L. laevigata Zone in Scandinavia. Berg-Madsen’s (1985a, fig. 5H) A. primordialis from the Upper Alum Shale ( Lejopyge laevigata Zone) of Bornholm, Denmark is herein referred to that species with doubt as it is incomplete and differs in the absence of anterior nodes and in the form of the marginal rim. Widely documented from the late middle Cambrian L. laevigata Zone in Denmark (Berg-Madsen 1985b), Sweden (Westergcird 1928, Wallerius 1930) and southern Britain (Nuneaton area; see Rushton 1978) and from the Aijusakan stage, early upper Cambrian of E. Siberia, Russia (Abushik 1960). Its supposed presence in the under- lying S. brachymetopa Zone in Scandinavia (see above) has not been corroborated. DIS and MW thank the Natural Environment Research Council (Grant GR8655) for supporting this research. Text-fig. 1. Terminology for the nodes in A. primordialis (right valve). Stereo-Atlas of Ostracod Shells 20 (18) 77-80 (1993) Cryptophyllus nuculopsis (1 of 4) 595.336 (113.312) (766 : 162.097.34): 551.351 + 552.52 ON CRYPTOPHYLLUS NUCULOPSIS HARRIS by Mark Williams (University of Leicester, England) Cryptophyllus nuculopsis Harris, 1957 1957 Cryptophyllus nuculopsis n. sp., R.W. Harris, Bull. Okla geol. Surv., 55, 182, pi. 5, figs. 11a, b. 1962 Cryptophyllus nuculopsis-, P.J. Jones, Bull. Bur. Miner. Resour. Geol. Geophys. Aust., 62-3, 5. 1968 Cryptophyllus nuculopsis Harris; P.J. Jones, Bull. Bur. Miner. Resour. Geol. Geophys. Aust. 99, 65. Holotype: Type locality: Figured specimens: Diagnosis: Remarks: Museum of Comparative Zoology, Harvard University, U.S.A., no. MCZ 4568; a carapace. From C.E. Decker’s Zone 31 (see Harris 1957), Mountain Lake Member, Bromide Formation, Simpson Group, middle Ordovician; U.S. Highway 77 section (sec. 25, T2S, R1E), Arbuckle Mountains, Oklahoma, U.S.A.; approximately lat. 34°25'N, long. 97°08'W. Museum of Comparative Zoology, Harvard University, U.S. A., no. MCZ 4568 (Holotype car.: PI. 20, 78, figs. 1, 3; PI. 20, 80, fig. 3). The Natural History Museum, London, [BMNH] no. OS 14581 (car.: PI. 20, 78, fig. 2; PI. 20, 80, figs. 1, 2). Holotype from the type horizon and locality. OS 14581 from the Mountain Lake Member, Bromide Formation, Highway 99 section (see Harris 1957), approximately 39 metres below the top of the Formation. Posteriorly elongated Cryptophyllus, lateral outline like that of the bivalve genus Mytilus. Up to eight retained lamellae. C. nuculopsis differs from the type species of Cryptophyllus Levinson, 1951, C. oboloides (Ulrich & Bassler, 1923), by its posteriorly elongate outline and consistently greater number of retained lamellae. The carapace of C. nuculopsis appears to be equivalved with no evidence of overlap. Explanation of Plate 20, 78 Figs. 1-3, car. (holotype, MCZ 4568, 0.72 mm long): fig. 1, LV ext. lat.; fig. 3, dors. obi. Fig. 2, car. ant. (OS 14581, 0.70 mm long). Scale A (100 pm; x 103), figs. 1, 2; scale B (100 pm; x96), fig. 3. Stereo-Atlas of Ostracod Shells 20, 79 Cryptophyllus nuculopsis (3 of 4) The lamellae of C. nuculopsis are typical for the genus Cryptophyllus, contrasting with the morphology of lamellae in the related genus Eridoconcha Ulrich & Bassler, 1923 (e.g. see Williams & Jones 1990, Stereo-Atlas Ostracod Shells, 17, 13-18) by lacking adventral ridges. Transverse thin sections show successive lamellae underlapping previous lamellae, the contact between the lamellae viewed in transverse profile being “v”-shaped (Text-fig. 1). In Simpson Group species of Cryptophyllus the morphology of the exposed portion of the lamellae in transverse profile can be gently concave as in C. nuculopsis, planar to weakly convex as in C. magnus (Harris, 1931), or convex as in C. gibbosus Harris, 1957. C. nuculopsis occurs in the Bromide Formation together with other eridostracans ( Eridoconcha simpsoni Harris, 1931 and C. gibbosus) where they characterise open marine shelf environments. Distribution: Tulip Creek Formation and Mountain Lake Member of the Bromide Formation, Simpson Group, middle Ordovician, Oklahoma, U.S. A. Acknowledgements: N.E.R.C. (Britain), the Humboldt Foundation (Germany) and the Universite Claude Bernard, Lyon (France) supported this research. Dr J.M. Berdan is thanked for loan of specimens. Text-fig. 1 . Schematic transverse section through the first four lamellae of a valve of C. nuculopsis (based on a thin-sectioned carapace, MP 435/7, Leicester University, Geology Department collection). Explanation of Plate 20, 80 Figs. 1, 2, car. (OS 14581, 0.70 mm long): fig. 1, LV ext. lat.; fig. 2, post. Fig. 3, car., LV ext. lat. obi. (holotype, MCZ 4568, 0.72 mm long). Scale A (100 //m; x 103), figs. 1-3. Stereo-Atlas of Ostracod Shells 20, 78 Cryptophyllus nuculopsis (2 of 4) Stereo-Atlas of Ostracod Shells 20 (19) 81-84 (1993) Neoamphissites costatus (1 of 4) 595.336.14 (113.63) (510 : 161.104.31): 551.351 + 552.54 ON NEOAMPHISSITES COSTATUS BECKER & WANG by Gerhard Becker & Wang Shang-qi (Senckenberg Museum, Frankfurt am Main, Germany & Institute of Geology and Palaeontology, Nanjing, China) Genus Neoamphissites Becker & Wang, 1992 Type-species (by original designation): Neoamphissites costatus Becker & Wang, 1992 Diagnosis: Amphissitid genus with small but distinct subcentral node, rather conspicuous posterior lobe and diffuse anterior lobe restricted to the anteromedian part of the valve. Outer carina flange-like; dorsal ridge and reduced inner carina developed; distinct horizontal ridge, crossing the subventral node; subdued additional ridge(s) possible. Ridges coarse; carapace surface delicately reticulate. Remarks: Neoamphissites belongs to the Family Amphissitidae Knight, 1928 (Superfamily Kirkbyacea Ulrich & Bassler, 1906) because of the presence of a subcentral node. Within the family, it seems closely related to the middle Pennsylvanian (Desmoinesian)+lw/7/?/s,5/Yes' (Amphikegelites) Sohn, 1983 (Bull. Am. Paleont., 84/316, 12). In Neoamphissites, however, the subcentral node is more distinct; more- over, a low anterior lobe, restricted to the anteromedian part of the valve, and horizontal ridge(s) are developed. The latter feature resembles somewhat the Middle Devonian genus Amphizona Kesling & Copeland, 1954 (Family Arcyzonidae Kesling, 1961). The genus is monotypic. Distribution: Upper Permian of China. Explanation of Plate 20, 82 Figs. 1, 3, adult RV (holotype, NIGP 115670, 1 1 10 pm long): fig. 1, ext. lat.; fig. 3, ext. vent. lat. obi. Fig. 2, juv. RV, vent, (paratype, NIGP 115672, 810 //m long). Scale A (300 //m; x67), figs. 1, 3; scale B (lOO^m; x95), fig. 2. Stereo-Atlas of Ostracod Shells 20, 83 Neoamphissites costatus (3 of 4) Neoamphissites costatus Becker & Wang, 1992 1992 Neoamphissites costatus sp. nov. G. Becker & Wang Shang-qi, Palaeontographica, A224, 15, pi. 2, figs. 1-3. Holotype: Type locality: Figured specimens: Diagnosis: Remarks: Distribution: Institute of Geology and Palaeontology (NIGP), Academia Sinica, Nanjing, China, no. NIGP 115670; an adult right valve. Beichuan, Sichuan Province, China; lat. 104°19'E, long. 31°56'N. Silicious limestones, Wuchuap- ing Formation, Wuchuapingian, Upper Permian. Institute of Geology and Palaeontology (NIGP), Academia Sinica, Nanjing, China, nos. NIGP 115670 (holotype, adult RV: PI. 20, 82, figs. 1, 3; PI. 20, 84, figs. 1, 3), NIGP 115672 (paratype, juv. RV: PI. 20, 82, fig. 2; PI. 20, 84, figs. 2, 4). All of the figured specimens are from the type locality and horizon. Neoamphissites species with three horizontal ridges (inner carina, horizontal and dorsal ridges); an additional, short ridge may occur anteromedianly (cf. PI. 20, 82, fig. 1 and PI. 20, 84, fig. 4). Neoamphissites costatus is easily recognizable by the three horizontal ridges: reduced inner carina, horizontal and dorsal ridges. An additional short, anteromedian ridge is present in the juvenile specimens available; this may due to ontogenetic or some other form of (non-genetic) variation. The species is considered to be benthic. The fauna is considered to be from an offshore environment. Only known from the type locality, Permian of China. Explanation of Plate 20, 84 Figs. 1, 3, adult RV (holotype, NIGP 115670, 1 1 10/ym long): fig. 1, ext. dors. lat. obi.; fig. 3, vent. obi. Figs. 2, 4, juv. RV (paratype, NIGP 115672, 810yum long): fig. 2, dors.; fig. 4, ext. dors. lat. obi. Scale A (300 pm\ x67), figs. 1, 3; scale B (100 pm; x95), figs. 2, 4. Stereo-Atlas of Ostracod Shells 20, 82 Neoamphissites costatus (2 of 4) Stereo-Atlas of Ostracod Shells 20, 84 Neoamphissites costatus (4 of 4) Stereo-Atlas of Ostracod Shells 20 (20) 85-88 (1993) Sinabairdia nodosa (1 of 4) 595.337.11 (113.63) (510.161.104.31): 551.351 + 552.54 ON SINABAIRDIA NODOSA BECKER & WANG by Gerhard Becker & Wang Shang-qi (Senckenberg Museum, Frankfurt am Main, Germany & Institute of Geology and Palaeontology, Nanjing, China) Genus Sinabairdia Becker & Wang, 1992 Type-species (by original designation): Sinabairdia nodosa Becker & Wang, 1992 Diagnosis: Sculptured bairdiid genus with typical overall bairdiid morphology (outline, contact structures of free margin) and conspicuous, centrally located hump-like inflation with centre above mid-height. Remarks: Sinabairdia belongs to the Family Bairdiidae Sars, 1888 (Superfamily Bairdiacea Sars, 1888). It is characterized by its distinct, subcentrally located carapace protuberance. Petasobairdia of Chen 1982 sensu Chen 1987 (see Shi Cong-guang & Chen Dequing, Stratigraphy and Palaeontology of the system boundaries in China, Permian and Triassic boundary , 46, Nanjing, University Press House, 1987) is considered to be congeneric material (see Becker & Wang, op. cit., 33). Distribution: Upper Permian of China. Sinabairdia nodosa Becker & Wang, 1992 1992 Sinabairdia nodosa sp. nov. G. Becker & Wang Shang-qi, Palaeontographica, A224, 33-34, pi. 11, figs. 1-3. Holotype: Institute of Geology and Palaeontology (NIGP), Academia Sinica, Nanjing, China, no. NIGP 115743; an adult carapace. Explanation of Plate 20, 86 Figs. 1, 3, adult car. (holotype, NIGP 115743, 1650 pm long): fig. 1, rt. lat.; fig. 3, dors. Fig. 2, adult LV, vent, (paratype, NIGP 115745, 1 600 pm long). Scale A (300 pm; X45), figs. 1-3. Stereo-Atlas of Ostracod Shells 20, 87 Sinabairdia nodosa (3 of 4) Type locality: Figured specimens: Diagnosis: Remarks: Distribution: Beichuan, Sichuan Province, China, lat. 104°19'E, long. 31°56'N. Silicious limestones, Wuchuap- ing Formation, Wuchuapingian, Upper Permian. Institute of Geology and Palaeontology (NIGP), Academia Sinica, Nanjing, China, nos. NIGP 115743 (holotype, adult car.: PI. 20, 86, figs. 1, 3; NIGP 115745 (paratype, adult LV: PI. 20, 86, fig. 2; PI. 20, 88, fig. 1), NIGP 115744 (paratype, adult RV: PI. 20, 88, figs. 2, 3). All of the figured specimens are from the type locality and horizon. Sinabairdia species with posterodorsally located and distinctly tuberculate hump. In general outline Sinabairdia nodosa resembles Petasobairdia cf. bicornuta of Chen, 1982 sensu Chen 1987 {op. cit.), from the Upper Permian Changsingian of Zhejiang Province, China. S. nodosa is distinguished from that taxon by having a dorsal spine on its left valve and a pointed posterior termination to its carapace. The species is considered to be benthic. The fauna is considered to be from an offshore environment. Only known from the type locality, Permian of China. Explanation of Plate 20, 88 Fig. 1, adult LV, int. lat. (paratype, NIGP 115745, 1600 pm long). Figs. 2, 3, adult RV (paratype, NIGP 115744, 1580 pm long): fig. 2, vent.; fig. 3, int. lat. Scale A (100 gm; x45), figs. 1-3. Sinabairdia nodosa (2 of 4) Sinabairdia nodosa (4 of 4) Stereo-Atlas of Ostracod Shells 20, 86 Stereo-Atlas of Ostracod Shells 20, 88 Stereo-Atlas of Ostracod Shells 20 (21) 89-92 (1993) Tuberoscapha obesa (1 of 4) 595.337.11 (113.33) (517 : 161.1 10.41): 551.351 +552.54 ON TUBEROSCAPHA OBESA BECKER & WANG by Gerhard Becker & Wang Shang-qi (Senckenberg Museum, Frankfurt am Main, Germany & Institute of Geology and Palaeontology, Nanjing, China) Genus Tuberoscapha Becker & Wang, 1992 Type-species (by original designation): Tuberoscapha obesa Becker & Wang, 1992 Diagnosis: Beecherellid genus with lobe-like lateral swellings. Remarks: Bairdiacea with an elongate, subrectangular to trapeziform outline and compressed or flattened valve margins and undifferentiated hinges are placed in the Family Beecherellidae Ulrich, 1894. The best known genera are Acanthoscapha Ulrich & Bassler, 1923 (synonym: Alanella Boucek, 1936) and Beecherella Ulrich, 1891. Acanthoscapha has its greatest length along the dorsal margin and Beecherella at the ventral margin. Taxonomically, the Acanthoscapha-Beecherella group has recently been severely “split” by several workers. There are, in fact, intermediate genera (i.e. Beecher oscapha Becker, 1992 [ Sencken- berg. leth., 71, 401] and Corniacanthoscapha Shi & Wang, 1987 [Late Silurian to Devonian Stratig- raphy and Palaeontology between Tewo and Liqu of west Qinling Mts., China, Nanjing, University Press House, Pt. 2, 323) or genera more-or-less related to Acanthoscapha (i.e. Sohnia Adamczak, 1976 [ Senckenberg . leth. 57, 343], Rabienoscapha Becker, 1989 and Carenthascapha Becker, 1989 [Geol. Jb. Hessen, 117, 9, 12]). Tuberoscapha Becker & Wang, 1992 also belongs to this group. It is distinguished from all Acanthoscapha species by the lateral swellings of its valves. Explanation of Plate 20, 90 Figs. 1, 3, adult RV (paratype, NIGP 115371, 950/ym long): fig. 1, ext. lat.; fig. 3, dors. obi. Fig. 2, adult LV, dors, (holotype, NIGP 115770, 1250 pm long). Scale A (200 //m; x86), fig. 1; scale B (200 pm; x68), fig. 2; scale C (200 pm\ x 100), fig. 3. Stereo-Atlas of Ostracod Shells 20, 91 Tuberoscapha obesa (3 of 4) The taxonomic splitting is analogous to that affecting other groups (e.g. Amphissitidae, Tricor- ninidae and sculptured Bairdiidae) and is a result of the increased availability of material in connec- tion with intensified studies on pelagic facies. The latter are the realm of the Thuringian Ecotype, to which the taxa mentioned belong. Distribution: Middle/Upper Silurian of China. Tuberoscapha obesa Becker & Wang, 1992 1992 Tuberoscapha obesa sp. nov. G. Becker & Wang Shang-qi, Palaeontographica, A224, 40, 41, pi. 23, figs. 5-8. Holotype: Type locality: Figured specimens: Diagnosis: Remarks: Distribution: Institute of Geology and Palaeontology (NIGP), Academia Sinica, Nanjing, China, no. NIGP 115770; an adult Damaoqi, Neimongol (Inner Mongolia) Autonomous Region, lat. 110°14'E, long. 41°40'N. Silicious limestones, Bateaobao Formation, Wenlock or Ludlow Series, Middle/Upper Silurian. Institute of Geology and Palaeontology (NIGP), Nanjing, China nos. NIGP 115770 (holotype, adult LV: PI. 20, 90, fig. 2; PI. 20, 92, figs. 1-3) and NIGP 115771 (paratype, adult RV: PL 20, 90, figs. 1, 3). All of the figured specimens are from the type locality and horizon. Tuberoscapha species with two lateral swellings; posterior swelling more conspicuous. Carapace surface striate. Tuberoscapha obesa is characterized by having distinct, striate swellings. Tuberoscapha sp. A Becker & Wang, 1992 {op. cit., 41) shows narrow, inconspicuous swellings. The species is considered to be necto-benthic. The fauna is from an open marine to basinal environment. Only known from the type locality, Silurian of China. Explanation of Plate 20, 92 Figs. 1-3, adult LV (holotype, NIGP 115611, 1250 //m long): fig. 1, int. lat.; fig. 2 vent.; fig. 3, ext. lat. Scale A (300 yum; x 72), fig. 1; scale B (300 pm; x68), figs. 2, 3. Stereo-Atlas of Ostracod Shells 20, 90 Tuberoscapha obesa (2 of 4) Stereo-Atlas of Ostracod Shells 20, 92 Tuberoscapha obesa (4 of 4) Stereo-Atlas of Ostracod Shells 20 (22) 93-96 (1993) Bulbosohnia bolboformis (1 of 4) 595.337.11 (113.33) (517: 161.110.41): 551.351 +552.54 ON BULBOSOHNIA BOLBOFORMIS BECKER & WANG by Gerhard Becker & Wang Shang-qi (Senckenberg Museum, Frankfurt am Main, Germany & Institute of Geology and Palaeontology, Nanjing, China) Genus Bulbosohnia Becker & Wang, 1992 Type-species (by original designation): Bulbosohnia bolboformis Becker & Wang, 1992 Diagnosis: Beecherellid genus with mid-dorsal hump. Remarks: Bairdiacea with an elongate, subrectangular to trapeziform outline and compressed or flattened valve margins and undifferentiated hinges are placed in the Family Beecherellidae Ulrich, 1894. The best known genera are Acanthoscapha Ulrich & Bassler, 1923 (synonym: Alanella Boucek, 1936) and Beecherella Ulrich, 1891. Acanthoscapha has its greatest length along the dorsal margin and Beecherella at the ventral margin. Taxonomically, the Acanthoscapha-Beecherella group has recently been severely “split” by several workers. There are, in fact, intermediate genera (i.e. Beecheroscapha Becker, 1992 [Senckenberg. leth., 71, 401] and Corniacanthoscapha Shi & Wang, 1987 [Late Silurian to Devonian Stratigraphy and Palaeontology between Tewo and Ligu of west Qinling Mts., China, Nanjing, University Press House, Pt. 2, 323]) or genera more-or-less related to Acanthoscapha (i.e. Sohnia Adamczak, 1976 [Senckenberg. leth. 57, 343], Rabienoscapha Becker , 1989 and Carenthascapha Becker, 1989 [Geol. Jb. Hessen, 117, 9, 12]). Bulbosohnia Becker & Wang, 1992 also belongs to this group. It is distinguished from all Acanthoscapha species (especially A. subnavicula Abushik, 1968) and from the Sohnia species by its dorsal hump. The taxonomic splitting is analogous to that affecting other groups (e.g. Amphissitidae, Tricorninidae Explanation of Plate 20, 94 Figs. 1-3, adult car. (holotype, NIGP 115782, 1380 /ym long): fig. 1, rt. lat. ; fig. 2, dors, obi.; fig. 3, vent. obi. Scale A (300 /ym; x60), figs. 1, 3; scale B (300 pm; x56), fig. 2. Stereo-Atlas of Ostracod Shells 20, 95 Bulbosohnia bolboformis (3 of 4) and sculptured Bairdiidae) and is a result of the increased availability of material in connection with intensified studies on pelagic facies. The latter are the realm of the Thuringian Ecotype, to which the taxa mentioned belong. Distribution: Silurian of China and N. America. Bulbosohnia bolboformis Becker & Wang, 1992 1992 Bulbosohnia bolboformis sp. nov. G. Becker & Wang Shang-qi, Palaeontographica , A224, 42, 43, pi. 14, figs. 1-4. Holotype: Type locality: Figured specimens: Diagnosis: Remarks: Occurrence: Institute of Geology and Palaeontology (NIGP), Academia Sinica, Nanjing, China, no. NIGP 115782; an adult carapace. Damaoqi, Neimongol (Inner Mongolia) Autonomous Region, lat. 110°14'E, long. 41°40'N. Silicious limestones, Bateaobao Formation, Wenlock or Ludlow Series, Middle/Upper Silurian. Institute of Geology and Palaeontology (NIGP), Nanjing, China nos. NIGP 115782 (holotype, adult car.: PI. 20, 94, figs. 1-3), NIGP 115783 (paratype, adult LV: PI. 20, 96, fig. 1), NIGP 115784 (paratype, adult LV: PI. 20, 96, fig. 2), NIGP 115785 (paratype, adult car.: PI. 20, 96, fig. 3). All of the figured specimens are from the type locality and horizon. Bulbosohnia species with globular hump; dorsal projections located admarginally. Bulbosohnia bolboformis is similar to Acanthoscapha subnavicula Abushik, 1968 of Copeland 1977 (Bull, geol. Surv. Can., 275, 40) from the Silurian of Canada. The latter material is probably conspecific. In Bulbosohnia sp. A of Becker & Wang, 1992 (op. cit., 43), the hump is inconspicuous and the anterodorsal projection located extramarginally. The Middle Devonian Sohnia sohni Adamczak, 1976 (Senckenbergiana, 57, 344) resembles B. bolboformis in general carapace morphology; however, it lacks a hump. B. bolboformis is considered to be nectobenthic. The fauna is from an open marine to basinal environment. The species is known with certainty only from the type locality. Probably also occurs in the Wenlock- Ludlow series, Silurian, District of Mackenzie, Canada. Explanation of Plate 20, 96 Fig. 1, adult LV, ext. lat. (paratype, NIGP 115783, 1000 pm long). Fig. 2, adult LV, int. lat. (paratype, NIGP 115784, 1330 pm long). Fig. 3, adult car., vent, (paratype, NIGP 115785, 1460 pm long). Scale A (100 /ym; x78), fig. 1; scale B (300 pm; x57), fig. 2; scale C (300 pm; x 53), fig. 3. Bulbosohnia bolboformis (2 of 4) Stereo-Atlas of Ostracod Shells 20, 94 Bulbosohnia bolboformis (4 of 4) Stereo-Atlas of Ostracod Shells 20, 96 Stereo-Atlas of Qstracod Shells 20 (23) 97-100 (1993) Semicytherura curvicauda (1 of 4) 595.337.14 (118.22) (420: 162.006.50): 551.351 ON SEMICYTHERURA CURVICAUDA MAYBURY sp. nov. by Caroline A. Maybury (Institute of Earth Studies, University of Wales, Aberystwyth) Holotype: Type locality: Derivation of name: Figured specimens: Diagnosis: Semicytherura curvicauda sp. nov. The Natural History Museum, London [BMNH] no. OS 14574; 9 RV. [Paratypes nos. OS 14572, OS 14573, OS 14575, OS 14576], Mixed sample, sample no. 1, Vicarage Pit, St. Erth, Cornwall, England (5°26'N, 50°10'N; Nat. Grid Ref. SW 556352): Upper Pliocene. Latin, referring to the curved, ornamental murus which commences at the caudal process and is one of the diagnostic characteristics of the new species. The Natural History Museum, London [BMNH] nos. OS 14572 (paratype, 9 LV: PI. 20, 98, fig. 1), OS 14574 (holotype, 9 RV: PI. 20, 98, fig. 2), OS 14573 (paratype, o’ LV: PI. 20, 98, fig. 3). OS 14575 (paratype, cr RV: PI. 20, 100, fig. 1). OS 14576 (paratype, 9 RV: PI. 20, 100, figs. 2-4). All paratypes are from the same sample as the holotype. See C.A. Maybury, Taxonomy, Palaeoecology and Biostratigraphy of Pliocene Benthonic Ostracoda from St. Erth and NW France, unpub. PhD thesis, Univ. Wales, 1, 3-6, 1985 for further sample details. A subrectangular, very small, reticulate Semicytherura with a prominent, curved murus commencing at the dorsal side of the caudal process. The four adductor scars, with the dorsalmost scar set Explanation of Plate 20, 98 Fig. 1, 9 LV, ext. lat. (paratype, OS 14572, 340 //m long): Fig. 2, 9 RV, ext. lat. (holotype, OS 14574, 340 qm long): Fig. 3, cr LV, ext. lat. (paratype, OS 14573, 370 /im long). Scale A (100 /tm; X 179), figs. 1-3. Stereo-Atlas of Ostracod Shells 20, 99 Semicytherura curvicauda (3 of 4) a little apart from the others, are marked externally by fossae in the anteromedian section of the valve. Remarks: This distinctive species with its robust ornament is one of 28 new species and one new subspecies of Semicytherura, which have been recovered from the St. Erth beds. Distribution: This species has been recovered from the Upper Pliocene deposits of St. Erth, Cornwall, England (sample nos. 1-3, 7, 14-16, 18, 21, 23, 25-28) and the Upper Pliocene (Redonian) deposits of Le Bosq d’Aubigny, NW France. See C. Maybury {op. cit.) and J.-P. Margerel, Les Foraminiferes du Redonien. Systematique, Repartition stratigraphique, Paleoecologie, Nantes, 1, 8-26. 1968 for details of the British and French samples respectively. Explanation of Plate 20, 100 Fig. 1, cr RV, ext. lat. (paratype, OS 14575, 350 qm long): Figs. 2-4 9 RV, (paratype, OS 14576, 350 //m long): Fig. 2, int. lat.; fig. 3, ant. hinge element; fig. 4, post, hinge element. Scale A (100 qm: x 179), figs. 1-2; scale B (25 qm; x403), figs. 3-4. Stereo-Atlas of Ostracod Shells 20, 98 Semicytherura curvicauda (2 of 4) Stereo-Atlas of Ostracod Shells 20, 100 Semicytherura curvicauda (4 of 4) Stereo-Atlas of Ostracod Shells 20 (24) 101-104 (1993) Loxocorniculum multireticulatum (1 of 4) 595.337.14 (118.22) (44 : 162.002.48): 551.351 ON LOXOCORNICULUM MULTIRETICULA TUM MAYBURY sp. nov. by Caroline A. Maybury (Institute of Earth Studies, University of Wales, Aberystwyth) Holotype: Type locality: Derivation of name: Figured specimens: Diagnosis: Loxocorniculum multireticulatum sp. nov. The National History Museum, London [BMNH] no. OS 14577; 9 LV. [Paratypes nos. OS 14578-OS 14580]. Shell-rich sand, Le Temple du Cerisier, SW of Rennes (approx, lat. 48°07'N, long. 1°41'W), NW France; Upper Pliocene, Redonian. Latin, from its well developed reticulate ornament. The Natural History Museum, London [BMNH] nos. OS 14577 (holotype, 9 LV: PI. 20, 102, fig. 1), OS 14578 (paratype, 9 RV: PI. 20, 102, fig. 2), OS 14579 (paratype, cr LV: PI. 20, 102, fig. 3), OS 14580 (paratype, 9 LV: PI. 20, 104, figs. 1-4). All paratypes are from the same sample as the holotype. See J.-P. Margerel, Les Foraminiferes du Redonien. Systematique, Repartition stratigraphique, Paleoecologie, Nantes 1, 8-26, 1968 for further details of the sample locality. A medium sized, subelliptical Loxocorniculum with its maximum height at anterior cardinal angle in female and at posterior third in male. Coarsely reticulate with posterodorsal protuberance looping over and obscuring the posterodorsal margin. Explanation of Plate 20, 102 Fig. 1, 9 LV, ext. lat. (holotype, OS 14577, 500 qm long); Fig. 2, 9 RV, ext. lat. (paratype, OS 14578, 520 gm long); Fig. 3, o* LV, ext. lat. (paratype, OS 14579, 600 /um long). Scale A (200 gm; x 107), figs. 1-3. Stereo-Atlas of Ostracod Shells 20, 103 Loxocorniculum multireticulatum (3 of 4) Remarks: The new species differs from the type, Loxocorniculum fischeri (Brady) (G.S. Brady in De Folin, L. & Perier, L. Les Fonds de la Mer, Paris, Savy, 1 (1), 154, pi. 18, figs. 15, 16, 1869), and most of the species assigned to Loxocorniculum in that the posterodorsal protuberance is less well defined. Distribution: This species is known only from the two Apigne localities: Borehole II and Le Temple du Cerisier, NW France; Upper Pliocene, Redonian. See J.-P. Margerel (op. cit.) for further sample details. Explanation of Plate 20, 104 Figs. 1-4, 9 LV, (paratype, OS 14580, 550 gm long); fig. 1. int. lat.; fig. 2, post, hinge element; fig. 3. ant. hinge element; fig. 4, muse, sc. Scale A (200 /tm; x 107), fig. 1; scale B (25 //m; x374), figs. 2, 3; scale C (25 ^m; x470), fig. 4. Stereo-Atlas of Ostracod Shells 20 (25) 105-108 (1993) Trachyleberis bathymarina (1 of 4) 595.337.14 (119.1) (265.7 : 163.160.33): 551.352 + 552.52 ON TRACHYLEBERIS BATHYMARINA AYRESS sp. nov. by Michael A. Ayress (Department of Geology, Australian National University, Canberra) Holotype: Type locality: Derivation of name: Figured specimens: Diagnosis: Trachyleberis bathymarina sp. nov. National Museum of Victoria, Melbourne, Australia, no. P 197948. Tasman Sea, Ocean Sciences Institute, University of Sydney core 1/86 6GC3, 90-91 cm, west Lord Howe Rise, present day water depth 1540 m. Latitude 32°58.8'S, longitude 159°59.9'E. Late Pleistocene foraminiferal ooze. Referring to the occurrence of this species in the deep-sea. National Museum of Victoria, Melbourne, Australia, nos. P 197948 (holotype, o* LV: PI. 20, 106, figs. 1, 5), P 197949 (paratype, O’ RV: PI. 20, 106, figs. 2, 3), P 197950 (paratype, 9 LV: PI. 20, 106, figs. 1, 4), P 197951 (paratype, 9 RV: PI. 20, 108, figs. 2, 3); all from the type locality at core intervals 90-91 cm, 179-180 cm, 165-166 cm and 145-146 cm, respectively. An eyeless, weakly primarily and secondarily reticulate species of Trachyleberis with short complex, mostly conjunctive spines and a narrow ocular rib extending through compressed anterior region. Marginal rim dentate and bearing large conular tubercles. Subcentral tubercle weakly developed. Sexual dimorphism strong; females much shorter and more inflated than males. Explanation of Plate 20, 106 Figs. 1, 5, o* LV (holotype, P 197948, 1310/tm long): fig. 1, ext. lat.; fig. 5, ext. surface detail. Figs. 2, 3, O' RV (P 197949, 1310/vm long); fig. 2, dors.; fig. 3, ext. lat. Fig. 4, 9 RV, subcentral muse. sc. (P 197951, 1190^m long). Scale A (500 /rm; X 50), figs. 1-3; scale B (100 /rm; x230), fig. 4; scale C (100 /rm; X 175), fig. 5. Stereo-Atlas of Ostracod Shells 20, 107 Trachyleberis bathymarina (3 of 4) Remarks: Distribution: Acknowledgement: Assigned to Trachyleberis on the basis of ornament, ocular rib and internal features. Nevertheless, it has a more rounded posterior margin and is more regularly spinose than is normal for the genus. In these respects it resembles Henry howella, but it lacks the longitudinal ridges and well-developed subcentral tubercle characteristic of that genus and in addition has a distinct ocular rib, compressed anterior and a weak reticulation, features uncharacteristic of Henryhowella. Other similar spinose deep-sea genera, Legitimocythere and Rugocythereis ( = Pennyella), differ in having a ventro- lateral spinose ridge in the former, and in the latter a much smaller, more subtriangular valve outline, mid-ventral snap-knob and a thicker postero-ventral marginal rim. Late Quaternary to Recent of the Tasman Sea, depths between 1340 and 2238 m; Chatham Rise, depths between 1204 and 3125 m, and Recent of the Kerguelen Ridge, depths between 915 and 3614 m. I would like to thank the staff of the Electron Microscope Unit (ANU) for their assistance and Professor Whatley for critically reviewing the manuscript. Explanation of Plate 20, 108 Figs. 1, 4, 9 LV (P 197950, 1250 am long): fig. 1, ext. lat.; fig. 4, int. lat. Figs. 2, 3, 9RV (P 197951, 1190 /tm long): fig. 2, ext. lat.; fig. 3, int. lat. Scale A (100 //m; x50), figs. 1-4. Stereo-Atlas of Ostracod Shells 20, 106 Tnachyleberis bathymarina (2 of 4) Trachyleberis bathymarina (4 of 4) Stereo- Atlas of Ostracod Shells 20, 108 Stereo-Atlas of Ostracod Shells 20 (26) 109-112 (1993) Pseudulrichia albraca (1 of 4) 595.336.12 (113.312) (82 : 164.070.31): 551.351 + 552.54 ON PSEUDULRICHIA ALBRACA SCHALLREUTER & LEHNERT sp. nov. by Roger E.L. Schallreuter & Oliver Lehnert (University of Hamburg & University of Erlangen-Nurnberg, Germany ) Pseudulrichia albraca sp. nov. Holotype: Type locality: Derivation of name: Diagnosis: Figured specimens: Geologisch-Palaontologisches Institut und Museum, University of Hamburg, Germany (GPIMH), no. 3242c; a right valve. [Paratypes: GPIMH nos. 3242a-b, d-h; 3243]. Quebrada Las Aquaditas. SW San Jose de Jachal, San Juan Province, W Precordillera, Argentina, lat. 30°19'S, long. 69° 10.5 'W; Pygodus anserinus conodont zone. Las Aguaditas Formation, Llanvirn-Llandeilo, Ordovician. Artificial combination from Latin altero bracchio carens, one-armed; alluding to the reduced anterior spine in comparison to typical representatives of the genus. Valve length up to about 0.61 mm. Main sulcus (S2) distinctly in front of mid-length and above mid-height. Anterior of S2 there is a low node; posterior of S2 and above mid-height there is a well developed posteriorly curved lobal spine. Geologisch-Palaontologisches Institut und Museum, University of Hamburg, nos. GPIMH 3242a (paratype, RV: PI. 20, 112, fig. 3), 3242b (paratype, LV: PI. 20, 110, fig. 3), 3242c (holotype, LV (PI. 20, 110, fig. 2), 3242e (paratype, RV: PI. 20, 112, fig. 2), 3242f (paratype, LV: PL 20, 110, fig. 1) and 3242g (RV: PI. 20, 112, fig. 1). Explanation of Plate 20, 110 Fig. 1, LV ext. lat. (paratype, GPIMH 3242f, 0.41 mm long). Fig. 2, LV ext. lat. (holotype, GPIMH 3242c, 0.57 mm long). Fig. 3, LV ext. lat. (paratype, GPIMH 3242b, 0.45 mm long). Scale A (100 /rm; x 160), fig. 1; scale B (100 //m; x 110), fig. 2; scale C (100 /rm; x 140), fig. 3. Stereo-Atlas of Ostracod Shells 20, 1 1 1 Pseudulrichia albraca (3 of 4) All of the figured specimens are silicified and are from the same sample (Lehnert SE-CON 51) as the holotype. Remarks: The most morphologically similar of all published species of Pseudulrichia is P. posterocerata Blumenstengel ( Freiberger ForschHft., (C), 182, 69, 1965) from the Upper Ordovician of Thuringia. P. posterocerata also possesses a weak anterior node and a strongly developed posterior spine. P. albraca is distinguished from that species by the more anterior position of its main sulcus S2 and of the spine and node. Distribution: Known only from type locality, Ordovician of Argentina. Explanation of Plate 20, 112 Fig. 1, RV ext. lat. (GPIMH 3242g, 0.51 mm long). Fig. 2, RV ext. lat. (paratype, GPIMH 3242e, 0.54 mm long). Fig. 3, RV ext. lat. (paratype, GPIMH 3242a, 0.47 mm long). Scale A (100 //m; x 120), figs. 1, 2; scale B (100 //m; X 140), fig. 3. Stereo-Atlas of Ostracod Shells 20, 112 Pseudulrichia albraca (4 of 4) Stereo-Atlas of Ostracod Shells 20, 1 10 Pseudulrichia albraca (2 of 4) Stereo-Atlas of Ostracod Shells 20 (27) 113-116 (1993) Lodesia adiastola (1 of 4) 595.336.12 (113.312) (82 : 164.070.31): 551.351 + 552.54 ON LODESIA ADIASTOLA SCHALLREUTER & LEHNERT gen. et sp. nov. by Roger E.L. Schallreuter & Oliver Lehnert (University of Hamburg & University of Erlangen-Niirnberg, Germany) Genus Lodesia gen. nov. Type species: Lodesia adiastola sp. nov. Anagram of the related Delosia Gailite, in which the lobes are similarly fused. Small genus. Distinctly in front of mid-length and above mid-height, near the dorsal border, there is a cone-like node, behind which there is a posteriorly curved spine. Node and spine are fused dorsally and are separated by a slit-like sulcus (S2) in their ventral part. In having a strongly developed Aechmina-Mke spine and a slit-like S2 positioned at the anteroven- tral part of the spine Lodesia resembles Delosia Gailite, 1967 (Gailite, L.K. 1967. Ostracodes. In: Gailite, L.K., Rybnikova, M.B. & Ulst, R.Z. The Stratigraphy, fauna and conditions of deposition of the Silurian rocks of the central East Baltic. Min. Geol. U.S.S.R., Inst. Geol. Zinatne, Riga). In the latter genus the spine is very stout, the S2 is pit-like and a prominent pseudovelum is present (see Schallreuter, R.E.L., Geol. Palaont. Westfalen, 7, 55, pi. 2, fig. 2b, 1987). Derivation of name: Diagnosis: Remarks: Explanation of Plate 20, 114 Fig. 1, LV ext. lat. (holotype, GPIMH 3244a, 494 am long). Fig. 2, LV ext. lat. (paratype, GPIMH 3244b, 465 fum long). Fig. 3, LV ext. lat. (paratype, GPIMH 3245, 482 //m long). Scale A (100 /2m; x 135), figs. 1, 3; scale B (100 /2m; X 140), fig. 2. Stereo-Atlas of Ostracod Shells 20, 115 Lodesia adiastola (3 of 4) Holotype: Type locality: Derivation of name: Diagnosis: Figured specimens: Distribution: Lodesia adiastola sp. nov. Geologisch-Palaontologisches Institut und Museum, University of Hamburg (GPIMH), no. 3244a; a left valve. [Paratypes: GPIMH nos. 3244b-e, 3245], Quebrada Las Aquaditas, SW San Jose de Jachal, San Juan Province, W Precordillera, Argentina, lat. 30°19'S, long. 69° 10.5 'W; Pygodus anserinus conodont zone. Las Aguaditas Formation, Llanvirn-Llandeilo, Ordovician. From Greek adiastolos, confused; alluding to the dorsally fused node and spine. As for the genus, which is currently monotypic. Geologisch-Palaontologisches Institut und Museum, University of Hamburg, nos. GPIMH 3244a (holotype, LV: PI. 20, 114, fig. 1), 3244b (paratype, LV: PL 20, 114, fig. 2), 3244c (paratype, LV PL 20, 116, fig. 1), 3244d (paratype, LV: PI. 20, 116, fig. 2), 3244e (paratype, RV: PI. 20, 116, fig. 3) and 3245 (LV: PL 20, 114, fig. 3). All of the figured specimens are from the same sample (Lehnert SE-CON 160) as the holotype. The material is silicified. Ostracod associates include Trispinatia rusconii (de Garcia & Proserpio, 1978) and Reginea ? jaanussoni (de Garcia & Proserpio, 1978). Known only from type locality, Ordovician of Argentina. Explanation of Plate 20, 1 16 Fig. 1, LV ext. lat. (paratype, GPIMH 3244c, 445 /rm long). Fig. 2, LV ext. lat. (paratype, GPIMH 3244d, 445 long). Fig. 3, RV ext. lat. (paratype, GPIMH 3244e, 433 /ym long). Scale A (100 /ym; x 150), fig. 1; scale B (100 /ym; x 135), fig. 2; scale C (100 /ym; X 155), fig. 3. Stereo-Atlas of Ostracod Shells 20 (28) 117-120 (1993) Eopilla ingelorae (1 of 4) 595.336.12 (113.31 1) (941 : 163.125.19): 551.351 ON EOPILLA INGELORAE SCHALLREUTER gen. et sp. nov. by Roger E.L. Schallreuter (University of Hamburg, Germany) Genus Eopilla gen. nov. Type species: Eopilla ingelorae sp. nov. Eo+pilla; the genus is considered to be an ancestor of Pilla Schallreuter & Siveter (Stereo-Atlas Ostracod Shells 15, 25-28, 1988). Small to medium-sized Pillinae. Quadrilobate; Li and L3 more strongly developed than L2 and L4. L2 long to very short ( = preadductorial node-like). Lobes broad to narrow, in some cases crista- like. Lobes connected ventrally. This genus is distinguished from the other genera of the subfamily Pillinae by the development of a distinct fourth lobe (L4) in the posterior part of the valve. Eopilla ingelorae sp. nov. Commonwealth Palaeontological Collections, Australian Geological Survey, Canberra, A.C.T., Australia (CPC), no. 23569; a left valve. [Paratypes: CPC nos. 23570-23574]. Type section of the Emanuel Formation at Prices Creek, northern Western Australia; lat. 18°35'48"S, long. 125°53'00"E. Lower Emanuel Formation, upper Tremadoc, lower Ordovician. Derivation of name: Diagnosis: Remarks: Holotype: Type locality: Explanation of Plate 20, 118 Fig. 1, LV ext. lat. (holotype, CPC 23569, 0.78 mm long). Fig. 2, dorsally incomplete RV ext. lat. (paratype, CPC 23570, 0.83 mm long). Fig. 3, juv. LV ext. lat. (paratype, CPC 23571, 0.69 mm long). Scale A (100 //m; x 100), fig. 1; scale B (100 //m; x75), fig. 2; scale C (100 yirm; x85), fig. 3. Stereo-Atlas of Ostracod Shells 20, 119 Eopilla ingelorae (3 of 4) Derivation of name: Diagnosis: Figured specimens: Remarks: Distribution: In honour of Dr Ingelore Hinz-Schallreuter for her help in Canberra in 1991. Valve length up to about 0.90 mm. Lobes narrow, of crista-like appearance; may protrude very slightly over the hinge-line. L2 narrow and long. Connecting lobe weak to virtually obsolete. Commonwealth Palaeontological Collections, Australian Geological Survey, Canberra, nos. CPC 23569 (holotype, LV: PI. 20, 118, fig. 1), 23570 (paratype, dorsally incomplete RV: PI. 20, 118, fig. 2), 23571 (paratype, LV PI. 20, 118, fig. 3), 23572 (paratype, anterodorsally incomplete RV: PI. 20, 120, fig. 1), 23573 (paratype, LV: PI. 20, 120, fig. 2) and 23574 (posterodorsally incomplete RV: PI. 20, 120, fig. 3). All of the figured specimens are from the same sample (WCB 705/46) as the holotype. Eopilla ingelorae is the oldest known Australian Ordovician ostracod. The Chinese species Eopilla sinensis, E. sinensis wangi and E. taitzehoensis Hou ( Acta palaeont. sin., 1, 40-50, 1953), all of which may be synonyms of each other, are characterized by having much broader lobes and a shorter L2 which forms a preadductorial node. Known only from the lower Emanuel Formation, upper Tremadoc, at the type locality (samples WCB 705/46-69). Explanation of Plate 20, 120 Fig. 1, anterodorsally incomplete juv. RV ext. lat. (paratype, CPC 23572, 0.52 mm long). Fig. 2, LV ext. lat. (paratype, CPC 23573, 0.73 mm long). Fig. 3, posterodorsally incomplete RV ext. lat. (paratype, CPC 23574, 0.71 mm long). Scale A (100 /vm; x 140), fig. 1; scale B (100 pm; x 100), fig. 2; scale C (100 /mi; x85), fig. 3. ■ V'- § ‘ Stereo-Atlas of Ostracod Shells 20, 120 Eopilla ingelorae (4 of 4) wm0m Stereo-Atlas of Ostracod Shells 20, 118 Eopilla ingelorae (2 of 4) Stereo-Atlas of Ostracod Shells 20 (29) 121-124 (1993) Eodominina nuela (1 of 4) 595.336.12 (113.311) (941 : 163.125.19): 551.351 ON EODOMININA NUELA SCHALLREUTER gen. et sp. nov. by Roger E.L. Schallreuter (University of Hamburg, Germany) Derivation of name: Diagnosis: Remarks: Genus Eodominina gen. nov. Type species: Eodominina nuela sp. nov. From Greek Eos, early; the genus is considered to be an ancestor of Dominina Burrett & Laurie (in Burrett et at., Mem. australas. Palaeontol., 1, 191, 1983). Small to medium-sized. Two prominent lobes, one in front and one behind S2 ; both occur mainly in dorsal half of valve and are connected in ventral half; each lobe is dorsally bulb- to spine-like. Tiny preadductorial node. No pseudovelum. In contrast to Webby Ha and Pilla (both Schallreuter & Siveter; see Stereo-Atlas Ostracod Shells, 15, 17-28, 1988), Eodominina, like Dominina, lacks a lobe-like pseudovelum. Dominina is distin- guished from Eodominina mainly by the development of a prominent, discreet bulb at the dorsal margin between the two main lobes. Endominina is possibly a synonym of the poorly documented Sinoprimitia Hou (Acta palaeont. sin., 1, 77, 1953) from the lower Ordovician of Hupeh, China. The latter genus also possesses two rounded dorsal nodes but no other taxonomically important features are known. Explanation of Plate 20, 122 Fig. 1, car. ext. It. lat. (holotype, CPC 23575, 0.86 mm long). Fig. 2, RV ext. lat. (paratype, CPC 23578, 0.79 mm long). Fig. 3, car. ext. vent. (CPC 23577, 0.70 mm long). Scale A (100 /ym; x90), fig. 1; scale B (100 /ym; x95), fig. 2; scale C (100 /ym; x75), fig. 3. Stereo-Atlas of Ostracod Shells 20, 123 Eodominina nuela (3 of 4) Holotype: Type locality: Derivation of name: Diagnosis: Figured specimens: Distribution: The main anterior lobe of Eodominina is considered to be Li and the small low node immedi- ately behind it (PI. 20, 124, fig. 3) is interpreted as a preadductorial node (L2). Moreover, if Domi- nina originates from Eodominina, the main posterior lobe of the latter must be considered as equivalent to L4 because in Dominina L3 is developed as a prominent bulb. Eodominina nuela sp. nov. Commonwealth Palaeontological Collections, Australian Geological Survey, Canberra, A.C.T., Australia (CPC), no. 23575; a carapace. [Paratypes: CPC nos. 23576-23578 and Geologisch-Palaontologisches Institut und Museum, University of Hamburg (GPIMH) no. 3247.] Type section of the Emanuel Formation at Prices Creek, northern Western Australia; lat. 18°35'48"S, long. 125°53'00"E. Upper Emanuel Formation, lower Arenig, lower Ordovician. After its occurrence in the upper Ema nuel Formation. Valves up to about 1.10 mm long. Lobes relatively narrow, dorsally spine-like, characteristically protruding over the hinge-line in lateral view, the posterior more so than the anterior lobe. Commonwealth Palaeontological Collections, Australian Geological Survey, Canberra, nos. CPC 23575 (holotype, car.: PI. 20, 122, fig. 1), 23576 (paratype, car.: PI. 20, 124, fig. 2), 23577 (para- type, car.: PI. 20, 122, fig. 3; PI. 20, 124, fig. 3), 23578 (paratype, RV: PL 20, 122, fig. 2). Geologisch-Palaontologisches Institut und Museum, University of Hamburg GPIMH 3247 (para- type car.: PI. 20, 124, fig. 1). All of the specimens are from the same sample (WCB 705/249) as the holotype. Known only from the upper Emanuel Formation, lower Arenig, at type locality (samples WCB 705/229-250). Explanation of Plate 20, 124 Fig. 1, car. ext. rt. lat. (paratype, GPIMH 3247, 0.86 mm long). Fig. 2, car. ext. rt. lat. (paratype, Fig. 3, car. ext. dors, (paratype, CPC 23577). Scale A (100 /ym; X 105), figs. 1, 2; scale B (100 /ym; x75), fig. 3. CPC 23576, 0.71 mm long). I Stereo-Atlas of Ostracod Shells 20, 122 Eodominina nuela (2 of 4) Stereo-Atlas of Ostracod Shells 20, 124 Eodominina nuela (4 of 4) Stereo-Atlas of Ostracod Shells 20 (30) 125-127 (1993) General Index Index, Volume 20, 1993 (1 of 3) Aboilia blessi Becker & Adamczak gen. et sp. nov.; 33-36 Abushik, A.F., Berg-Madsen, V., Melnikova, L., Siveter, D.J. & Williams, M., On Anabarochilina primordialis (Linnarsson); 71-76 Abushik, A.F., Siveter, D.J. & Michailova, E.D., On Asiacicatricula varia (Michailova); 63-66 Abushik, A.F., Siveter, D.J. & Michailova, E.D., On Malguzaria sarvi Michailova; 67-70 Adamczak, F.F., & Becker, G., On Aboilia blessi Becker & Adamczak gen. et sp. nov.; 33-36 adiastola, Lodesia\ 113-116 albraca, Pseudulrichia\ 109-112 Anabarochilina primordialis (Linnarsson); 71-76 Asiacicatricula varia (Michailova); 63-66 Ayress, M.A., On Trachyleberis bathymarina Ayress sp. nov.; 105-108 Ayress, M.A. & Correge, T., On Nipponocythere cuneata Ayress & Correge sp. nov.; 25-28 Ayress, M.A. & Drapala, V., On Kuiperiana dryppa (Whatley & Coles); 29-32 Ayress, M.A. & Drapala, V., On Nipponocythere colalongoae (Ciampo); 17-24 Baltonotella elegans (Harris); 37-40 bathymarina, Trachyleberis ; 105-108 Becker, G. & Adamczak, F.F., On Aboilia blessi Becker & Adamczak gen. et sp. nov.; 33-36 Becker, G. & Wang, S., On Bulbosohnia bolboformis Becker & Wang; 93-96 Becker, G. & Wang, S., On Neoamphissites costatus Becker & Wang; 81-84 Becker, G. & Wang, S., On Sinabairdia nodosa Becker & Wang; 85-88 Becker. G. & Wang, S., On Tuberoscapha obesa Becker & Wang; 89-92 Berg-Madsen, V., Melnikova, L., Siveter, D.J., Williams, M. & Abushik, A.F., On Anabarochilina primordialis (Linnarsson); 71-76 blessi, Aboilia', 33-36 bispinosa, Parulrichia', 59-62 bolboformis, Bulbosohnia', 93-96 Bulbosohnia bolboformis Becker & Wang; 93-96 colalongoae , Nipponocythere', 17-24 Correge, T. & Ayress, M.A., On Nipponocythere cuneata Ayress & Correge sp. nov.; 25-28 costatus, Neosamphissites\ 81-84 Cryptophyllus nuculopsis Harris; 77-80 cuneata, Nipponocythere', 25-28 curvicauda, Semicytherura', 97-100 Cyrheromorpha diamphidia Maybury sp. nov.; 1-4 Dewey, C.P. & Kohn, P., On Sulcella huecoensis Dewey & Kohn sp. nov.; 13-16 diamphidia, Cytheromorpha; 1-4 diversa, Parulrichia', 55-58 Drapala, V. & Ayress, M.A., On Kuiperiana dryppa (Whatley & Coles); 29-32 Drapala, V. & Ayress, M.A., On Nipponocythere colalongoae (Ciampo); 17-24 dryppa, Kuiperiana-, 29-32 elegans, Baltonotella', 37-40 Eodominina nuela Schallreuter gen. et sp. nov.; 121-124 Eopilla ingelorae Schallreuter gen. et sp. nov.; 117-120 huecoensis, Sulcella', 13-16 hybosa, Kayina ; 41-44 ingelorae, Eopilla', 117-120 Kayina hybosa Harris; 41-44 Kiltsiella rosensteinae (Sarv); 9-12 Kohn, P. & Dewey, C.P., On Sulcella huecoensis Dewey & Kohn sp. nov.; 13-16 Kuiperiana dryppa (Whatley & Coles); 29-32 Lehnert, O. & Schallreuter, R.E.L., On Lodesia adiastola Schallreuter & Lehnert gen. et sp. nov.; 113-116 Lehnert, O. & Schallreuter, R.E.L., On Pseudulrichia albraca Schallreuter & Lehnert sp. nov.; 109-112 Lodesia adiastola Schallreuter & Lehnert gen. et sp. nov.; 1 13-1 16 Loxocorniculum multireticulatum Maybury sp. nov.; 101-104 Lundin, R.F. & Petersen, L.E., On Wenlockiella phillipsiana (Jones & Holl); 49-54 Lundin, R.F. & Siveter, D.J., On Parulrichia diversa (Jones & Holl); 55-58 Lundin, R.F. & Siveter, D.J., On Parulrichia bispinosa Lundin & Siveter sp. nov.; 59-62 Malguzaria sarvi Michailova; 67-70 Maybury, C.A., On Cytheromorpha diamphidia Maybury sp. nov.; 1-4 Maybury, C.A., On Loxocorniculum multireticulatum Maybury sp. nov.; 101-104 Maybury, C.A., On Semicytherura curvicauda Maybury sp. nov.; 97-100 Maybury, C.A., On Semicytherura paraclausi Maybury sp. nov.; 5-8 Melnikova, L., Siveter, D.J., Williams, M., Abushik, A.F. & Berg-Madsen, V., On Anabarochilina primordialis (Linnarsson); 71-76 Michailova, E.D., Abushik, A.F. & Siveter, D.J., On Asiacicatricula varia (Michailova); 63-66 Michailova, E.D., Abushik, A.F. & Siveter, D.J., On Malguzaria sarvi Michailova; 67-70 multireticulatum, Loxocorniculum', 101-104 Neoamphissites costatus Becker & Wang; 81-84 Nipponocythere colalongoae (Ciampo); 17-24 Nipponocythere cuneata Ayress & Correge sp. nov.; 25-28 nodosa, Sinabairdia', 85-88 nuculopsis, Cryptophyllus', 77-80 nuela, Eodominina', 121-124 obesa, Tuberoscapha', 89-92 paraclausi, Semicytherura', 5-8 Parulrichia bispinosa Lundin & Siveter sp.nov.; 59-62 Parulrichia diversa (Jones & Holl); 55-58 Stereo-Atlas of Ostracod Shells 20, 1 26 Index, Volume 20, 1993 (2 of 3) pauciperforata, Punctoschmidtella; 45-48 Petersen, L.E. & Lundin, R.F., On Wenlockiella phillipsiana (Jones & Holl); 49-54 phillipsiana, Wenlockiella ; 49-54 primordialis, Anabarochilina ; 71-76 Pseudulrichia albraca Schallreuter & Lehnert sp. nov.; 109-112 Punctoschmidtella pauciperforata (Harris); 45-48 rosensteinae, Kiltsiella ; 9-12 Sarv, L.I. & Siveter, D.J., On Kiltsiella rosensteinae (Sarv); 9-12 sarvi, Malguzaria', 67-70 Schallreuter, R.E.L., On Eodominina nuela Schallreuter gen. et sp. nov.; 121-124 Schallreuter, R.E.L., On Eopilla ingelorae Schallreuter gen. et sp. nov.; 117-120 Schallreuter, R.E.L. & Lehnert, O., On Lodesia adiastola Schallreuter & Lehnert gen. et sp. nov.; 113-116 Schallreuter, R.E.L. & Lehnert, O., On Pseudulrichia albraca Schallreuter & Lehnert sp. nov.; 109-112 Semicytherura curvicauda Maybury sp. nov.; 97-100 Semicytherura paraclausi Maybury sp. nov.; 5-8 Sinabairdia nodosa Becker & Wang; 85-88 Siveter, D.J. & Lundin, R.F., On Parulrichia bispinosa Lundin & Siveter sp. nov.; 59-62 Siveter, D.J. & Lundin, R.F., On Parulrichia diversa (Jones & Holl); 55-58 Siveter, D.J., Michailova, E.D. & Abushik, A.F., On Asiacicatricula varia (Michailova); 63-66 Siveter, D.J., Michailova, E.D. & Abushik, A.F., On Malguzaria sarvi Michailova; 67-70 Siveter, D.J. & Sarv, L.I., On Kiltsiella rosensteinae (Sarv); 9-12 Siveter, D.J., Williams, M., Abushuk, A.F., Berg-Madsen, V. & Melnikova, L., On Anabarochilina primordialis (Linnarsson); 71-76 Sulcella huecoensis Dewey & Sohn sp. nov.; 13-16 Trachyleberis bathymarina Ayress sp. nov.; 105-108 Tuberoscapha obesa Becker & Wang; 89-92 Vannier, J. & Williams, M., On Baltonotella elegans (Harris); 37-40 Vannier, J. & Williams, M., On Kayina hybosa Harris; 41-44 Vannier, J. & Williams, M., On Punctoschmidtella pauciperforata (Harris); 45-48 varia, Asiacicatricula ; 63-66 Wang, S. & Becker, G., On Bulbosohnia bolboformis Becker & Wang; 93-96 Wang, S. & Becker, G., On Neoamphissites costatus Becker & Wang; 81-84 Wang, S. & Becker, G., On Sinabairdia nodosa Becker & Wang; 85-88 Wang, S. & Becker, G., On Tuberoscapha obesa Becker & Wang; 89-92 Wenlockiella phillipsiana (Jones & Holl); 49-54 Williams, M., On Cryptophyllus nuculopsis Harris; 77-80 Williams, M., Abushik, A.F., Berg-Madsen, V., Melnikova, L. & Siveter, D.J., On Anabarochilina primordialis (Linnarsson); 71-76 Williams, M. & Vannier, J., On Baltonotella elegans (Harris); 37-40 Williams. M. & Vannier, J., On Kayina hybosa Harris; 41-44 Williams, M. & Vannier, J., On Punctoschmidtella pauciperforata (Harris); 45-48 Stereo- Atlas of Ostracod Shells 20, 1 27 Index, Volume 20, 1993 (3 of 3) (113.23) (113.31) (113.311) (113.312) (113.33) (113.331) (265.7) (420) (44) (47) (485) (510) (517) Index; Geological Horizon See 1 (1) 5-22 (1973) for explanation of the Schedules in the Universal Decimal Classification Middle Cambrian: (113.333) Upper Silurian: Anabaro chili na primordialis; 71-76 Malguzaria sarvi; 67-70 Ordovician: (113.61) Lower Permian: Aboilia blessi ; 33-36 Sulcella huecoensis ; 13-16 Lower Ordovician: (113.63) Upper Permian: Eodominina nuela; 121-124 Neoamphissites costatus; 81-84 Eopilla ingelorae; 117-120 Sinabairdia nodosa ; 85-88 Middle Ordovician: (118.22) Pliocene: Baltonotella elegans ; 37-40 Cytheromorpha diamphidia; 1-4 Cryptophyllus nuculopsis ; 77-80 Loxocorniculum multireticulatum; 101-104 Kayina hybosa ; 41-44 Semicytherura curvicauda ; 97-100 Lodesia adiastola; 113-116 Semicytherura paraclausi; 5-8 Pseudulrichia albraca; 109-112 (119) Quaternary: Punctoschmidtella pauciperforata; 45-48 Nipponocythere colalongoae; 17-24 Silurian: (119.1) Pleistocene: Bulbosohnia bolboformis\ 93-96 Kuiperiana dryppa; 29-32 Parulrichia bispinosa ; 59-62 Nipponocythere cuneata; 25-28 Tuberoscapha obesa; 89-92 Lower Silurian: Trachyleberis bathymarina; 105-108 Asiacicatricula varia; 63-66 Kiltsiella rosensteinae ; 9-12 Parulrichia diversa\ 55-58 Wenlockiella phillipsiana; 49-54 Index; Geographical Location See 1 (1) 5-22 (1973) for explanation of the Schedules in the Universal Decimal Classification South-West Pacific: (57) Asiatic Russia: Kuiperiana dryppa; 29-32 Anabarochilina primordialis; 71-76 Nipponocythere colalongoae; 17-24 (575.1) Uzbekistan: Nipponocythere cuneata; 25-28 Asiacicatricula varia; 63-66 Trachyleberis bathymarina : 105-108 Malguzaria sarvi; 67-70 England: (71) Canada: Anabarochilina primordialis; 71-76 Aboilia blessi; 33-36 Cytheromorpha diamphidia; 1-4 (766) Oklahoma: Parulrichia diversa; 55-58 Baltonotella elegans; 37-40 Semicytherura curvicauda; 97-100 Cryptophyllus nuculopsis; 77-80 Semicytherura paraclausi; 5-8 Kayina hybosa; 41-44 Wenlockiella phillipsiana; 49-54 Punctoschmidtella pauciperforata; 45-48 France: (768) Tennessee: Loxocorniculum multireti culatum; 101-104 Parulrichia diversa; 59-62 Russia/Estonia: (789) New Mexico: Kiltsiella rosensteinae; 9-12 Kiltsiella rosensteinae; 9-12 Sweden: (82) Argentina: Anabarochilina primordialis; 71-76 Lodesia adiastola; 113-116 China: Pseudulrichia albraca; 109-112 Neoamphissites costatus; 81-84 (941) Western Australia: Sinabairdia nodosa; 85-88 Eodominina nuela; 121-124 Mongolia: Bulbosohnia bolboformis; 93-96 Tuberoscapha obesa; 89-92 Eopilla ingelorae; 117-120 BPCC Blackpool COLOUR PRINTERS 0253 22351 Fax: 0253 295733 Stanley Road • Blackpool Stereo-Atlas of Ostracod Shells: Vol. 20, Part 2 CONTENTS (15) 63-66 (16) 67-70 (17) 71-76 (18) 77-80 (19) 81-84 (20) 85-88 (21) 89-92 (22) 93-96 (23) 97-100 (24) 101-104 (25) 105-108 (26) 109-112 (27) 113-116 (28) 117-120 (29) 121-124 (30) 125-127 On Asiacicatricula varia (Michailova); by D.J. Siveter, E.D. Michailova & A.F. Abushik. On Malguzaria sarvi Michailova; by D.J. Siveter, E.D. Michailova & A.F. Abushik. On Anabarochilina primordialis (Linnarsson); by D.J. Siveter, M. Williams, A.F. Abushik, V. Berg-Madsen & L. Melnikova. On Cryptophyllus nuculopsis Harris; by M. Williams. On Neoamphissites costatus Becker & Wang; by G. Becker & Wang Shang-qi. On Sinabairdia nodosa Becker & Wang; by G. Becker & Wang Shang-qi. On Tuberoscapha obesa Becker & Wang; by G. Becker & Wang Shang-qi. On Bulbosohnia bolboformis Becker & Wang; by G. Becker & Wang Shang-qi. On Semicytherura curvicauda Maybury sp. nov; by C.A. Maybury. On Loxocorniculum multireticulatum Maybury sp. nov.; by C.A. Maybury. On Trachyleberis bathymarina Ayress sp. nov.; by M.A. Ayress. On Pseudulrichia albraca Schallreuter & Lehnert sp. nov.; by R.E.L. Schallreuter & O. Lehnert. On Lodesia adiastola Schallreuter & Lehnert gen. et sp. nov., by R.E.L. Schallreuter & O. Lehnert. On Eopilla ingelorae Schallreuter gen. et sp. nov., by R.E.L. Schallreuter. On Eodominina nuela Schallreuter gen. et sp. nov.; by R.E.L. Schallreuter. Index for Volume 20, (1993). 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