A Stereo-Atlas of Ostracod Shells edited by R. H. Bate, J. W. Neale, Lesley M. Sheppard and David J. Siveter Volume 9, Part 2; December, 1982 Published by the British Micropalaeontological Society, London Editors Dr R.H. Bate, Department of Palaeontology, British Museum (Natural History), Cromwell Road, London SW7 5BD. Prof. J.W. Neale, Department of Geology, The University, Hull HU6 7RH. Dr Lesley M. Sheppard, SSI (U.K.) Limited, 12 New Burlington Street, London W1X IFF. Dr David J. Siveter, Department of Geology, The University, Leicester LEI 7RH. Editorial Board Dr G. Bonaduce, Stazione Zoologica, 80121 Napoli, Italy. Dr J.-P. Cohn, Esso Production Research - European, 213 Cours Victor Hugo, 33321 Begles, France. Dr P. De Deckker, Research School of Pacific Studies, Australian National University, PO Box 4, Canberra ACT 2600, Australia. Dr D. van Harten, Universiteit van Amsterdam, Geologisch Instituut, Nieuwe Prinsengracht 130, Amsterdam, The Netherlands. Dr I. Purper, Departamento de Paleontologia e Estratigrafia, UFRGS, 90 000 Porto Alegre RS, Brazil. Dr R.E.L. Schallreuter, Universitat Hamburg, Geologisch-Palaontologisches Institut, Bundesstrasse 55, D 2000 Hamburg 13, West Germany. Officers of the British Micropalaeontological Society Chairman Dr B. Owens, Institute of Geological Sciences, Ring Road, Halton, Leeds. Secretary Dr A.R. Lord, Department of Geology, University College London, Gower Street, London WC1. Treasurer Dr R.H. Bate, Department of Palaeontology, British Museum (Natural History), Cromwell Road, London SW7 5BD. Editor Dr L.M. Sheppard, SSI (U.K.) Limited, 12 New Burlington Street, London W1X IFF. Circular Editor Dr E.G. Spinner, Department of Geology, The University, Mappin Street, Sheffield SI. Conodont Group: Chairman Dr R.L. Austin, Department of Geology, The University, Southampton. Secretary Dr A.C. Higgins, Department of Geology, The University, Sheffield SI. Foraminifera Group: Chairman Dr M.B. Hart, Department of Geology, Plymouth Polytechnic, Drake Circus, Plymouth PL4 8AA. Secretary Dr M.D. Fewtrell, Erico Research Laboratories Ltd., Lane House, 233-235 Roehampton Lane, London SW15 4LB. Microplankton Group: Chairman Dr J. P. G. Fenton, Robertson Research International Ltd., Ty’n-y-Coed, Llanrhos, Llandudno, Gwynnedd LL30 ISA. Secretary Mr R. Woollam, Institute of Geological Sciences, Ring Road, Halton, Leeds. Ostracod Group: Chairman Dr R.C. Whatley, Department of Geology, University College of Wales, Aberystwyth, Dyfed SY23 3DB. Secretary Dr D.J. Horne, Department of Geology, City of London Polytechnic, Walburgh House, Bigland Street, London EL Palynology Group: Chairman Mr M.J. Fisher, British National Oil Corporation. 150 St. Vincent Street, Glasgow G2 5LJ. Secretary Dr D.J. Smith, BP Research Centre, Chertsey Road, Sunbury-on-Thames, Middlesex. Instructions to Authors Contributions illustrated by scanning electron micrographs of Ostracoda in stereo-pairs are invited. Format should follow the style set by the majority of papers in this issue. Descriptive matter apart from illustrations should be cut to a minimum; preferably each plate should be accompanied by one page of text only. 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 Dr David J. Siveter. The front cover shows a female left valve, external and internal views, of Bilobatia serralobata Schallreuter. Printed by United Printing Services, Blackpool, England. A Stereo -Atlas of Ostracod Shells edited by R. H. Bate, J. W. Neale, Lesley M. Sheppard and David J. Siveter Volume 9, 1982 Part 1 (pp. 1-84); 16th July, 1982 Part 2 (pp. 85-144); December, 1982 Published by The British Micropalaeontological Society, London Stereo- Atlas of Ostracod Shells 9, ii Contents Contents 1 On Braderupia asymmetrica (Neckaja); by R. E. L. Schallreuter 1 2 On Bilobatia serralobata Schallreuter; by R. E. L. Schallreuter 9 3 On Byrsolopsina manca Schallreuter sp. nov.; by R. E. L. Schallreuter 17 4 On Loxoconcha cuneiformis Malcolmson; by D. J. Horne and E. Robinson 21 5 On Loxoconcha dimorpha Hartmann; by D. J. Horne 27 6 On Loxoconcha linleyi Horne sp. nov.; by D. J. Horne 33 7 On Waiparacythereis joanae Swanson; by K. Swanson 41 8 On Acanthocythereis dohukensis Khalaf sp. nov.; by S. K. Khalaf 47 9 On Actinocythereis iraqensis Khalaf sp. nov.; by S. K. Khalaf 51 10 On Chrysocythere naqibi Khalaf sp. nov.; by S. K. Khalaf 55 11 On Hermanites transversicostata Khalaf sp. nov.; by S. K. Khalaf 59 12 On Propontocypris trigonella (Sars); by J. Athersuch and J. E. Whittaker 63 13 On Propontocypris pirifera (G. W. Muller); by J. Athersuch and J. E. Whittaker 69 14 On Bonnyannella robertsoni (Brady); by J. Athersuch 77 15 On Hithis colonus Schallreuter & Siveter sp. nov.; by R. E. L. Schallreuter & D. J. Siveter 85 16 On Homeokiesowia epicopa Siveter sp. nov.; by D. J. Siveter 89 17 On Schallreuteria superciliata (Reed); by D. J. Siveter 93 18 On Concavhithis latosulcatus Schallreuter gen. et sp. nov.; by R. E. L. Schallreuter 101 19 On Gellensia nodoreticulata Schallreuter sp. nov.; by R. E. L. Schallreuter 105 20 On Airina amabilis (Neckaja); by R. E. L. Schallreuter 109 21 On Bennelongia tunta De Deckker sp. nov.; by P. De Deckker 1 17 22 On Caboncypris nunkeri De Deckker gen. et sp. nov.; by P. De Deckker 125 23 On Cypretta yapinga De Deckker sp. nov.; by P. De Deckker 133 24 Index for Volume 9, 1982 141 25 On Eucypris fontana (Graf)- Addenda; by P. De Deckker 144 Stereo- Atlas of Ostracod Shells 9 (15) 85-88 (1982) 595.336.13 (113.312) (755 : 162.079.39) : 551.35 + 552.55 Hithis colonus (1 of 4) ON HITHIS COLONUS SCHALLREUTER & SIVETER sp. nov. by R. E. L. Schallreuter and David J. Siveter (University of Hamburg, West Germany and University of Leicester, England) Hithis colonus sp. nov. Holotype: Type locality: Derivation of name: Figured specimens: Brit. Mus. (Nat. Hist.) no. OS 6681, $ RV. [Paratypes: Brit. Mus. (Nat. Hist.) nos. OS 6682-91 and Geologisch-Palaontologisches Institut, University of Hamburg no. 2675]. Section in field on South side of road, 0.2 km SE of Strasburg Junction, just W of Strasburg, Shenandoah County, Virginia, U.S.A., c. lat. 39° 0' N, long. 78° 22' W. Locality 3 of Whittington & Evitt (Mem. geol. Soc. Amer., 59, 5, 1954) and Tripp & Evitt ( Geol . Mag., 118, 666, 1982); lower part of Edinburg Formation, middle Ordovician. Latin colonus, inhabitant of a colony; ‘Virginia' being named by Sir Walter Raleigh in honour of Queen Elizabeth I. Brit. Mus. (Nat. Hist.) nos. OS 6681 (holotype, $ RV: PI. 9, 88, fig. 3), OS 6682 (o'LV: PI. 9. 86, figs. 4, 5; PI. 9, 88, fig. 4), OS 6683 (9 LV: PI. 9, 88, fig. 2), OS 6685 ( 9RV: PI. 9, 88, fig. 1), OS 6686 (9 LV: PI. 9, 86, figs. 1-3; PI. 9, 88, fig. 5). All specimens are silicified, from the type horizon and locality; material kindly sent for study by Mr. R. Tripp. Explanation of Plate 9, 86 Figs. 1-3,9 LV (OS 6686, 1460/xm long): fig. 1, ext. post; fig. 2, ext. lat.; fig. 3, ext. ant. Figs. 4, S^LV (OS 6682, 1430/xm long): fig. 4, ext. lat.; fig. 5, ext. ant. Scale A (250/xm; x 40), figs. 1, 3; scale B (250/xm; x 37), fig. 2; scale C (250/xm; x 37), figs. 4, 5. .ilJ- -++-t- + -i- t + -+ 7 n + + + Stereo- Atlas of Ostracod Shells 9, 87 Hithis colonus (3 of 4) Diagnosis: Hithis with L4 as a broad, mostly dorsal inflation in posterior third of domicilium. L3 elongate, tilts backwards, becoming confluent dorsally with L4 and separated from it ventrally by a broad depression (S3). LI elongate parallel to anterior margin. Dolon from anterior part of ventral to anteroventral regions, strongly convex (“false pouch"), with row of long spines confluent with velum. Velum developed pre-dolonally and post-dolonally as a ridge, bears long spines at least to anterior cardinal corner and also near posterior cardinal corner. Terminations to at least mid ventral-anterior series of spines apparently joined by a ‘bar’ in both dimorphs. Lobes lack ornament. Remarks: This is the first record of Hithis outside Baltoscandia. Two other congeneric taxa are known (Schallreuter, Palaeontographica 144, 76, 1973), the type-species H. hithis Schallreuter, 1964 from M Ordovician Backsteinkalk erratic boulders of N Germany and H. leviconvexus Schallreuter, 1967 from U Ordovician Ojlemyrflint erratic boulders on Gotland. Hithis is thus one of several ostracod genera common to both the European and N American plates during M Ordovician times. H. colonus is larger than both H. hithis (9 c. 0.74 mm long) and H. leviconvexus (9 c. 1.20mm long). It most resembles//, hithis, which also has a short, strongly convex dolon with a row of spines at about the border of lateral and ventral surfaces, and a similar S2 and preadductorial node. Compared to//, hithis the dolon in H. colonus extends further anteriorly, its dolonal spines are stronger, LI and L4 are lobes rather than single ventral spine-like nodes, its velum is developed above and behind the dolon as a spinose ridge (cf. only spines in H. hithis) and its lateral surface lacks spines or granules. H. leviconvexus is possibly synonymous with//. ? mamillosa Krause (Z. Deutsch. geol. Ges., 44 (3), 393, 1892; cf. Schallreuter Stereo-Atlas of Ostracod Shells 6, 85, 1979). It is distinguished from both congeneric taxa by its weakly convex dolon. H. colonus represents a second lineage and possibly a separate subgenus. Distribution: Known at present only from the type locality. TP Tr Explanation of Plate 9, 88 Fig. 1 ,9RV, int. lat. (OS 6685, 1400/xm long); fig. 2,9LV, int. lat. (OS 6683, 1450/xm long); fig. 3,9 RV, ext. lat. (holotype, OS 6681, 1450/xm long); fig. 4,cfLV, ext. vent. (OS 6682); fig. 5,9LV, ext. vent. obi. (OS 6686). Scale A (300/xm; x 33), fig. 1; scale B (300/xm; x 30), fig. 2; scale C (250/xm; x 37), fig. 3; scale D (250/xm; x 37), figs. 4, 5. I I I Lll I + T I Stereo- Atlas of Ostracod Shells 9, 86 i J i i- Hithis colonus (2 of 4) 1—1-1- h-M- l_ J_L I I I I + - I I I f-H Stereo- Atlas of Ostracod Shells 9, 88 Hi this colonus (4 of 4) i~r -n -14 i- i_r m- i-r 'IT' "tT" r 44 I I ■I- I _Lh I I I ■llJ. T + + Stereo-Atlas of Ostracod Shells 9 (16) 89-92 (1982) 595.336.13 (113.312) (429 : 162.005.51) : 551.35 + 552.55 Homeokiesowia epicopa (1 of 4) ON HOMEOKIESO WIA EPICOPA SIVETER sp. nov. by David J. Siveter (University of Leicester, England) Homeokiesowia epicopa sp. nov. 1978 Tallinnella sp. nov. 1; D. J. Siveter, in: R. H. Bate and E. Robinson (Eds.), A Stratigraphical Index of British Ostracoda, Geol. J., special issue 8, 48, pi. 1, figs. 9, 10. Holotype: Brit. Mus. (Nat. Hist.) no. OS 6695, 9 LV. Type locality: Old quarry about 300m south of Cwm Agol Farm, about 8 km west of Llandeilo, Dyfed, Wales; approx, lat. 51° 51' N, long. 4° 05’ W (Nat. Grid. Ref. SN 56552070). Llandeilo ‘Flags’, Llandeilo Series, M Ordovician. Derivation of name: Greek, epikopos, furnished with oars; fancied resemblance of the nodes and velum to an ancient galley ship. Figured specimens: Brit. Mus. (Nat. Hist.) nos. OS 6669 (c/RV: PI. 9, 90, figs. 2, 3; PI. 9, 92, fig. 1), OS 6670 (9 LV: PI. 9, 90, fig. 4), OS 6695 (holotype, 9 LV: PI. 9, 90, fig. 1; PL 9, 92, fig. 2), OS 6696 (9 RV: PI. 9, 92, figs. 3-5), OS 6697 ( 9 RV : PI. 9, 92, fig. 6). All figured specimens are from the type locality and horizon. Explanation of Plate 9, 90 Fig. 1,9LV, ext. lat. (holotype, OS 6695, 2130/u.m long). Figs. 2, 3,cfRV (OS 6669, 1840/aiti long): fig. 2, ext. lat.; fig. 3, ext. post. Fig. 4, 9LV, ext. lat. (OS 6670, 1860^01 long). Scale A (500/u.m; x 25), fig. 1; scale B (500/u.m; x 30), figs. 2-4. -t-r-i + + H JiJ ++-t Stereo-Atlas of Ostracod Shells 9, 9 1 Homeokiesowia epicopa (3 of 4) Diagnosis: Remarks: Distribution: Large species of Homeokiesowia having small nodes on moderately developed lobes. Dorsal parts of LI, L3 and L4 are bulbous, extending above dorsum. L2 consists of dorsal and ventral nodes connected by weak, sinous ridge. L4 and the more prominent L3 are ridge-like centrally and each has a ventral node. Female dolon in lateral view extends from posterodorsal region to below posterior base of L3. Valves granulose. The tallinnelline Homeokiesowia Schallreuter, 1979 is here recorded from outside the M Ordovician (Viru Series) of Baltoscandia for the first time. H. epicopa shows incipient dissolution of its lobes into nodes, a development more completely accomplished in the Estonian type-species, H. frigida (Sarv, 1959) (see Schallreuter, Stereo-Atlas of Ostracod Shells 6 (15), 75-78, 1979). The lobal morphology in H. epicopa represents a more primitive condition than that of congeneric forms. H. epicopa further differs from H. frigida in its larger size (females can be twice as large), by its shorter dolon which in lateral outline is more abruptly restricted posteroventrally, by the absence of tubercles covering the velum and of spine-like structures above LI and L2. Both species show well developed infravelar antral dimorphism and have a similar pattern of nodes in front of and behind S2. The only other known congeneric species, H. pernodosa Opik ( Publ . geol. Inst. Univ. Tartu, 50, 31, 1937) is poorly known, but also displays a more advanced lobal dissolution than in H. epicopa. All the known material of H. epicopa is silicified. In addition to the figured valves, other material (Brit. Mus. (Nat. Hist.)) includes OS 6694 and valves labelled “ Tallinella sp.” in IO 6257. Besides the type locality,//, epicopa is known at present from one other nearby locality at a similar horizon (C. Jones, pers. comm.). Explanation of Plate 9, 92 Fig. l,cfRV, ext. dors. (OS 6669); fig. 2,9LV, ext. vent. obi. (holotype, OS 6695). Figs. 3-5,9 RV (OS 6696 1910p,m long): fig. 3. ext. ant.; fig. 4, ext. lat.; fig. 5, ext. vent. Fig. 6, 9 RV, int. vent. obi. (OS 6697, 2100/xm long). Scale A (500/a.m; x 30), fig. 1 ; scale B (500/xm; x 25), fig. 2; scale C (500/j.m; x 30), figs. 3-5; scale D (500p.m; x 25), fig. 6. ■tr" -Tr — 1_ XL. I I I — 1 LX -l-L- t“ + T -i-r Stereo-Atlas of Ostracod Shells 9, 90 Homeokiesowia epicopa (2 of 4) 1-1-1-- I—M-- -t— M-- Stereo-Atlas of Ostracod Shells 9, 92 Homeokiesowia epicopa (4 of 4) •t— t — ■t— i — — IT ‘“tT r —I J — i— I I . I I I — I 1 l T "t Stereo- Atlas of Ostracod Shells 9 (17) 93-100 (1982) 595.336.13 (113.313) (420 : 162.003.54) : 551.35 + 552.52 Schallreuteria superciliata (1 of 8) Derivation of name: Diagnosis: ON SCHALLREUTERIA SUPERCILIATA (REED) by David J. Siveter (University of Leicester, England) Genus SCHALLREUTERIA gen. nov. Type-species: Beyrichia (Ctenobolbina?) superciliata Reed, 1910 In honour of Dr. R. E. L. Schallreuter, University of Hamburg, for his considerable contribution to our knowledge of Ordovician ostracods. Wehrliinae with four distinct, non-cristate lobes. Anterior and postadductorial lobes (LI, L3) project as cusps well above the dorsal margin; L4 widest and with a low cusp, L3 slender, L2 diminutive. Infravelar antral dimorphism; females with long convex, sausage-shaped dolon, with fine transverse external ‘ribbing’ and a row of fine peripheral spines having a grill-like appearance. Velum in tecnomorphs has rows of small spines. Valves granulose and tuberculate-spinose. Explanation of Plate 9, 94 Figs. l-S^RV (A109790a, 2050/xm long): fig. 1, ext. ant., ornament on velum and ant. lobe; fig. 2, ext. lat. ; fig. 3, ornament on L3-L4. Scale A (lOO^tm; x 100), fig. 1; scale B (500/a.m; x 34), fig. 2; scale C (100/u.m; x 135), fig. 3. ■n _r, -t-t-i + + H + + -t Stereo- Atlas of Ostracod Shells 9, 95 Schallreuteria superciliata (3 of 8) Remarks: Rakverella Opik ( Publ . geol. Inst. Univ. Tartu 50, 45, 1937) and Pectidolon Schallreuter ( Geologie , 15, 205, 1966) show closest morphological similarity to Schallreuteria, which differs particularly in its more well defined, non-cristate quadrilobation and by its wider and less markedly grill-like dolonal periphery. In dolonal and velar morphology Schallreuteria displays typical wehrliine characteristics and is the first recorded representative of the subfamily from outside Baltoscandia. The special kind of antral dimorphism which typifies the Wehrliinae Schallreuter (Ber. geol. Ges. D.D.R., 10 (4), 484, 1965) is most spectacularly displayed in Bilobatia Schallreuter, 1976 (see Schallreuter, Stereo-Atlas of Ostracod Shells, 9 (2), 9-16, 1982). Schallreuteria superciliata (Reed, 1910) 1910 Beyrichia ( Ctenobolbina ?) superciliata sp. nov. F. R. C. Reed, Geol. Mag., (5), 7, 218, pi. 17, figs. 14, 14a. 1910 Beyrichia (Tetradella) Turnbulli sp. nov. F. R. C. Reed, Geol. Mag., (5), 7, 219, pi. 17, figs. 12, 12a, 13, 13a. 1934 Ctenobolbina superciliata (Reed); R. S. Bassler & B. Kellett, Spec. Pap. geol. Soc. Am., 1, 53, 207. 1934 Tetradella turnbulli (Reed); R. S. Bassler & B. Kellett, Ibid., 1, 210, 483. 1947 Tetradella superciliata (Reed); J. C. Harper, Geol. Mag., 84, 350, pi. 10, fig. 6. 1978 'Beyrichia' superciliata Reed, 1910; D. J. Siveter, in: R. H. Bate & E. Robinson (Eds.), A Stratigraphical Index of British Ostracoda, Geol. J., special issue 8, 52, pi. 3, figs. 3, 4, 6. Lectotype: (here designated). Sedgwick Museum, University of Cambridge no. A10985 a-b; tecnomorphic RV external and internal moulds, Reed, pi. 17, figs. 14, 14a, 1910. For a lectotype designation of 'B.' turnbulli see Remarks below. Explanation of Plate 9, 96 Fig. 1 , partcfLV, ext. lat. (A109790b; length visible 1880p.m). Figs. 2, 3,9 RV (A29968b, 2250pm long): fig. 2, ext. lat.; fig. 3, ornament on L1-L2. Scale A (500p,m; x 34), fig. 1; scale B (500/a.m; x 31), fig. 2; scale C (100p.m; x 86), fig. 3. -Tf- -Tf- Schallreuteria superciliata (2 of 8) ~n -14 Stereo-Atlas of Ostracod Shells 9, 94 L-J-U f-M-- Stereo-Atlas of Ostracod Shells 9, 96 IT It I I n Schallreuteria superciliata (4 of 8) i i H- 4 r r -T-t-t- Stereo-Atlas of Ostracod Shells 9, 97 Schallreuteria superciliata (5 of 8) Type locality: Figured specimens: Diagnosis: Near Alston road, c. 1km NE of Melmerby, Cumbria, England, Nat. Grid Ref.: NY 62313832; approx, lat 54° 44' N long. 2° 35' W. See W. T. Dean (Proc. Yorks, geol. Soc., 32, 210-14, 1959). Melmerby Beds ( = Part of the Dufton Shales), Longvillian, Caradoc Series, Ordovician. Sedgwick Museum, University of Cambridge nos. A 109790a (dRV: PI. 9, 94, figs. 1-3), A 109790b (d'LV: PI. 9, 96, fig. 1), A29968b(9RV: PI. 9, 96, figs. 2, 3), A10983b ( 9RV: PI. 9, 98, figs. 1-4; PI. 9, 100, fig. 1), A10984b (9 RV: PI. 9, 100, fig. 2), A10985b (lectotype, tecnomorphic RV: PI. 9, 100, fig. 3). All specimens form part of Reed’s original material and are from the type locality. Species of Schallreuteria with prominent single spines adjacent to adventral structure: in both dimorphs one spine occurs below S2 and one posteroventrally, male has third spine below LI. Sulci irregularly granulose to smooth; discrete tubercles, often arranged in rows, occur along lobes. Explanation of Plate 9, 98 Figs. 1-4, 9RV (lectotype of \8.’ turnbulli, A10983b, 2120/am long): fig. 1, ext. lat.; fig. 2, ornament on S2-L3; fig. 3, syllobial ornament; fig. 4, peripheral spines on dolon. Scale A (500/am; x 33), fig. 1; scale B (100/am; x 120), fig. 2; scale C (50/am; x 185), fig. 3; scale D (50/am; x 200), fig. 4. rr rr -t-r — i -M — I H 4-U _l T Tt Stereo-Atlas of Ostracod Shells 9, 99 Schallreuteria superciliata (7 of 8) -M--4 Remarks: All known material consists of moulds and the delicate lobal cusps are sometimes not preserved in the casts (cf. females PI. 9, 96, fig. 2 and PI. 9, 98, fig. 1). Based on Reed's only figured (tecno- morphic) specimen of ‘B.’ superciliatia (lectotype designated above) and his two figured (female right) valves of \B.’ turnbulli (lectotype here designated: A10983a - b = Reed 1910, pi. 17, figs. 12, 12a) the two species are considered synonymous. This fact but not the dimorphic nature of the taxa, was recognised by Harper (1947), who attributed the specific differences described by Reed to factors of preservation. The figures in Reed’s paper were printed ‘in reverse’; all 3 valves are re- illustrated herein. Conspecific material consists of A10984a — b (9 RV: Reed 1910, pi. 17, figs. 13, 13a), A29967a — b (tecnomorphic LV), A29968a — b ( 9 RV), and A109790a — b (incomplete tecnomorphic carapace). Harper (1947, 350) incorrectly used the term ‘holotype’ for Reed’s only figured valve of ‘ B .’ superciliata. The second syntype of 'B.' superciliata , A29971a — b (tecnomorphic RV) is not conspecific with the designated lectotype and probably belongs to Rigidella. In adults of S. superciliata the development of tubercles varies. There can be 3-4 conspicuous tubercles aligned respectively along L2, the posterior part of L3 and the anterior part of L4 (e.g. PI. 9, 96, fig. 2) though the full complement of tubercles is lacking in some adults (e.g. PI. 9, 98, fig. 1). Distribution: Known with certainty only from the type locality in the Cross Fell inlier. Tetradella cf. superciliata is recorded from the Longvillian of the Harthwaite Sike section of the same inlier (Dean 1959, 207). Explanation of Plate 9, 100 Fig. 1,9RV, syllobial ornament (A10983b); fig. 2, 9RV (A10984b, 2230yam long); fig. 3, tecnomorph RV, ext. lat. (lectotype of B.' superciliata. A10985b, 1975/u.m long). Scale A (100/am; x 120), fig. 1; scale B (500/am; x 31), fig. 2; scale C (500/am; X 31), fig. 3. L±_L I I I -1-4 I I I I t— l-T -t-r -i-t-i— -L_ j_i_. -+-++- Stereo- Atlas of Ostracod Shells 9, 1 00 — n i i i i i i -14 i i i i n Schallreuteria superciliata (8 of 8) ] Schallreuteria superciliata (6 of 8) i j Stereo-Atlas of Ostracod Shells 9, 98 i i i r t-r IT IT rr i i —I J — I — Stereo- Atlas of Ostracod Shells 9 (18) 101-104 (1982) 595.336.13 (113.313) (492.71 : 161.008.54) : 551.35 + 552.55 Concavhithis latosulcatus (1 of 4) ON CONCAVHITHIS LATOSULCATUS SCHALLREUTER gen. et sp. nov. by Roger E. L. Schallreuter (University of Ham burg, German Federal Republic) Genus CONCAVHITHIS gen. nov. Type-species: Concavhithis latosulcatus sp. nov. Derivation of name: Diagnosis: Remarks: Latin, concavus, concave and the generic name Hithis, alluding to the concave posterior ventral margin. Gender masculine. A medium-sized, unisulcate genus of Sigmoopsinae. Free margin in posterior half of centroventral region concave. Nearly unisulcate; S2 in dorsal half very broad and deep, ventrally small, narrower and not very deep; SI almost obsolete, S3 a weak sulcus or a semisulcus. Field ( = L4) posterior of S3 much closer to the contact plane than field anterior of S3. LI and L2 virtually fused, preadductorial node discernable. L3 consisting of a posteroventral lobe and a dorsal bulb-like lobal spine. Tecnomorphs with a keel-like velum. Females with a small velar flange and a velar antrum, and a histial ridge without an antrum. Marginal sculpture on both valves appears as a normal or small flange-like ridge. Lateral surface punctate to reticulate. Marginal surface reticulate except for the velar antrum. Histial canaliculus with a row of puncta. Concavhithis is considered a descendant of Sigmoopsis and is distinguished from it by several features but the main difference is its spine-like dorsal L3. In the typical Sigmoopsis species the males possess a histial ridge and the females a histial flange with a histial antrum. Explanation of Plate 9, 102 Figs. 1, 2, tecnomorphic RV (holotype, GPIMH 2678, 1005p.m long): fig. 1, ext. lat. ; fig. 2, ext. vent. obi. Scale A (100p.m; x 99), figs. 1,2. J I L T + ~t + + -1 + + + -l -J -n- +++-- Stereo- Atlas of Ostracod Shells 9, 1 03 Concavhithis latosulcatus (3 of 4) Remarks (contd): Holotype: Type locality: Derivation of name: Figured specimens: Diagnosis: Remarks: Distribution: One evolutionary trend in Sigmoopsis is to reduce the histial sculptures. In one of the youngest species, S. granulata, the male histium is still present but developed only as a brim whereas the velum is developed as a distinct keel. In the females of S. granulata the histium is developed as a flange-like keel but there is no histial antrum, only a canaliculus with a row of puncta. Concavhithis latosulcatus sp. nov. Geologisch-Palaontologisches Institut und Museum, University of Hamburg, no. 2678, tecno- morphic RV. [Paratypes: nos. 2679-2682]. Upper Ordovician Ojlemyrflint erratic boulder no. Syl56 of the Upper Kaolinsand (Lower Pleistocene), near Braderup, Isle of Sylt (N Frisian Is., N Sea), Germany; lat 54° 56'N, long. 8° 21'E. Latin, latus , broad and sulcatus, sulcate; alluding to the broad S2. Geologisch-Palaontologisches Institut und Museum, University of Hamburg (GPIMH) nos. 2678 (tecnomorphic RV: PI. 9, 102, figs. 1,2), 2679 (fragmentary tecnomorphic (?) RV: PI. 9, 104, fig. 1), 2680 (incomplete tecnomorphic LV: PI. 9, 104, fig. 2) and 2681 (fragmentary ?RV: PI. 9, 104, fig. 3). All specimens are from the type locality; boulder coll, by Ulrich von Hacht, 1981. As for the genus. Concavhithis latosulcatus is another example of a palaeocope with a ventricular concavity. Other examples are Disulcina ? longissima Schallreuter (N. Jb. Geol. Palaont. Mh. 1971 ( 1 1), figs. 1.1-3), Wehrlia olbertzae Schallreuter (Ber. geol. Ges. DDR 10 (4), 484, pi. 1 1, fig. 2, 1965 and Palaeonto- graphica (A) 153 (4/6), 208, pi. 42 (=9), fig. 1, 1976) and Tetrada ventroconcava Schallreuter, 1976 (op. cit., 174-5, pi. 35 (=2), figs. 19, 20). Ventricular concavities in palaeocopes are rare exceptions of no great taxonomic significance. Known only from the type locality. Explanation of Plate 9, 104 Fig. 1, fragmentary (tecnomorphic ?) RV, ext. lat. (paratype, GPIMH 2679); fig. 2, incomplete tecnomorphic LV, ext. lat. (paratype, GPIMH 2680, 975p.m long); fig. 3, fragmentary 9 RV, ext. ant. obi. (paratype, GPIMH 2681). Scale A ( 100p.m; x 101), figs. 1,2; scale B ( 100p.m; x 80), fig. 3. ■TT- ■Tf 2a -i~r i i Stereo- Atlas of Ostracod Shells 9, 102 Concavhithis latosulcatus (2 of -i-i 4) i-fl— — M- - J-L- 4— (- Stereo- Atlas of Ostracod Shells 9, 1 04 Concavhithis latosulcatus (4 of 4) M— t-r IT "IT r i j 4 — L J.1J -r-f- T-t-t Stereo-Atlas of Ostracod Shells 9 (19) 105-108 (1982) Gellensia nodoreticulata (1 of 4) 595.336.13 (113.313) (486 : 161.018.57 + 492.71 : 161.008.54) : 551.35 + 552.55 ON GELLENSIA NODORETICULATA SCHALLREUTER sp. nov. by Roger E. L. Schallreuter (University of Hamburg, German Federal Republic) Gellensia nodoreticulata sp. nov. Holotype: Type locality: Derivation of name: Figured specimens: Geologisch-Palaontologisches Institut und Museum, University of Hamburg, no. 2683, 9LV. [Paratype: no. 2685, tecnomorphic RV], Upper Ordovician Ojlemyrflint erratic boulder no. Sy56 of the Upper Kaolinsand (Lower Pleistocene), near Braderup, Isle of Sylt (N Frisian Is., N Sea), Germany; lat. 54° 56' N, long. 8° 21' E. Latin, nodus , node and reticulatus, reticulate; alluding to the reticulate preadductorial node. Geologisch-Palaontologisches Institut und Museum, University of Hamburg (GPIMH) nos. 2683 (incomplete? LV: PI. 9, 106, figs. 1, 2) and 2684 (nearly complete tecnomorphic RV: PI. 9, 106, figs. 1,2). No. 2683 is from the type locality; coll, by Ulrich von Hacht, 1977. No. 2684 is from the upper Ordovician Ojlemyrflint erratic boulder no. G13 from the beach at Haftings, Isle of Gotland (Baltic Sea), lat. 57° 53' N, long. 18° 37' E; coll, by Horst Kaufmann, 1975. Explanation of Plate 9, 106 Figs. 1, 2, incomplete 9LV (holotype, GPIMH 2683, 1315/xm long): fig. 1, ext. vent.; fig. 2, ext. lat. Scale A (100p,m; x 76), figs. 1, 2. H 4-1- JiJ- T rr Stereo- Atlas of Ostracod Shells 9, 107 ++-+- Gellensia nodoreticulata (3 of 4) Diagnosis: Species of Gellensia with females a little more than 1.32 mm long. Velar frill nearly entire, narrowing in the dorsal regions, more so posterodorsally than anterodorsally. Marginal sculpture appears as a ridge. Preadductorial node reticulate, lateral surface pustulate. Remarks: Gellensia nodoreticulata differs from the Middle Ordovician type-species, G. gellensis Schallreuter (Geologie 16 (5), 617, 1967), mainly by its reticulate preadductorial node, its pustulate lateral surface, its ridge-like marginal sculpture and especially its posteriorly longer velar frill. G. gotlandica Schallreuter (op. cit., 618) has a relatively higher domicilium, a posteriorly shorter velar frill and a spinose lateral surface. Gellensia nodoreticulata very much resembles Cystomatochilina. Gellensia, Cysto- matochilina and the related Platybolbina all show a phylogenetic trend to extend the velar frill to the cardinal corners. In Platybolbina (Reticulobolbina) and Gellensia the frill is restricted in the Middle Ordovician species and entire but narrow at the cardinal corners in the Upper Ordovician species (Schallreuter, Geologie 18 (7), 879, 1969). In Cystomatochilina the frill is entire and clipped at the cardinal corners even in the Middle Ordovician C. matura Schallreuter (Ber. geol. Ges. DDR, 10 (4), pi. 9, fig. 2, 1965; Palaeontographica (A), 149 (4/6), pi. 22 (1), fig. 2, 1975). In the Upper Ordovician type-species C. umbonata (Krause) the frill is entire and also very broad at the cardinal corners (Jaanusson, Bull. geol. Inst. Univ. Upsala 37 (3/4) =Publ. Palaeont. Instn. Univ. Upsala 17, fig. 16, 1957). Cystomatochilina umbonata of Sarv ( Eesti NSV Tead. Akad. Geol. Inst, uurimused 9, pi. 1, fig. 1, 1962) from the Porkuni Stage (F:) of Estonia is perhaps a tecnomorphic valve of Gellensia nodoreticulata but the characteristic preadductorial node and the diagnostic dorsal parts of the velar frill are broken away. Distribution: Ojlemyrflint (Upper Ordovician) erratic boulders of the Isle of Gotland (Baltic Sea) and of the Upper Kaolinsand (Lower Pleistocene) of the Isle of Sylt (N Frisian Is., N Sea). Explanation of Plate 9, 108 Figs. 1, 2, nearly complete tecnomorphic RV (GPIMH 2684, 1245/a.m long): fig. 1, ext. lat.; fig. 2, ext. vent. Scale A (100p.m; x 80), figs. 1, 2. LI -i-L tt Stereo- Atlas of Ostracod Shells 9, 106 Gellensia nodoreticulata (2 of 4) IT TT Li_L Stereo- Atlas of Ostracod Shells 9, 1 08 Gellensia nodoreticulata (4 of 4) "TT- •l '■ -4-4 Stereo-Atlas of Ostracod Shells 9 (20) 109-116 (1982) 595.336.13 (113.312) (492.71 : 161.008.54) : 551.35 + 552.55 Airina amabilis (1 of 8) ON AIRINA AMABILIS (NECKAJA) by Roger E. L. Schallreuter (University of Hamburg, German Federal Republic ) 1958 Airina amabilis (Neckaja, 1958) Dilobella amabilis sp. n. A. I. Neckaja, Trudy vses. neft. nauchno-issled. geol.-razv. Inst. (VNIGRI), 115 (= Mikro fauna 1959 1960 non 1966 1970 1973 1976 1976 1979 SSSR 9), 349-350, pi. 1, figs. 20, 21. Brevibolbina amabilis (Neckaja); L. I. Sarv, Eesti NSV Tead. Akad. Geol. inst. uurimused, 4, 142-144, 193, tab. 2 (189), pi. 25, figs. 1-4, text-fig. 14B. Brevibolbina amabilis (Neckaja); L. 1. Sarv, Ibid., 5, tab. 1. Brevibolbina amabilis', R. M. Mannil, Istorija razvitija Baltijskogo bassejna v ordovike (Evolution of the Baltic Basin During the Ordovician) , 52 (? 1967). Brevibolbina amabilis (Neckaja); A. Roomusoks, Stratigrafija viruskoj i charjuskoj serij (ordovik) Severnoj Estonii I (Stratigraphy of the Viruan Series (Middle Ordovician) in Northern Estonia), 135, 152, 153, 196, 260, tabs. 10 (178), 12 (219), 15 (296). Dilobella amabilis Neckaja; R. E. L. Schallreuter, Palaeontographica (A), 144 (1/3), 74 ( = not Brevibolbina', closer to Disulcina). Brevibolbina amabilis (Neckaja); N. Sidaraviciene, Sovet. geol., 1976 (8), tab. 1 (49). Brevibolbina amabilis (Neckaja); V. Jaanusson, The Ordovician System (Ed. Bassett, M. G.; Proc. Palaeont. Assoc. Symp. Birmingham 1974), text-fig. 10 (faunal log). Brevibolbina amabilis; N. Sidaraviciene, Eesti NSV Tead Akad. Toimetised (Geol.), 28 (4), text-figs. 1-3 (faunal logs). Explanation of Plate 9, 1 1 0 Figs. 1-3, 9 RV (GPIMH 2527, 659p,m long): fig. 1, ext. lat. ; fig. 2, ext. vent.; fig. 3, ext. ant. Scale A (100p,m; x 120), figs. 1-3. liJ T + -t -r-t + + 44 4 -7-rr + + 4 Stereo- Atlas of Ostracod Shells 9, 1 1 1 Airina amabilis (3 of 8) Holotype: Type locality: Figured specimens: Vsesojuznyj neftjanoj naucno-issledovatel’skij geologorazvedocnyj institut (VNIGRI), Leningrad, no. 4-128, 9 RV (carapace ?). py. Diagnosis: Bol’sie Korcany, Leningrad obi., Russia; lat. 59° 33' N, long. 29° 2' E. Gubkov beds = Schundorov Substage of the Idavere Stage (C,B), Viru Series (middle Ordovician). Geologisch-Palaontologisches Institut und Museum, University of Hamburg (GPIMH) nos. 2527 ( 9RV: PI. 9, 110, figs. 1-3), 2528(?RV: PI. 9, 112, fig. 1), 2529(9LV: PI. 9, 112, fig. 2), 2530 (juv. car.: PI. 9, 112, fig. 3), 2531 (tfLV: PI. 9, 114, figs. 1, 2), 2532 (juv. RV: PI. 9, 114, fig. 3), 2533 (? LV: PI. 9, 1 16, fig. 1), 2534 ( 9RV: PI. 9, 1 16, fig. 2) and 2535 (juv. LV: PI. 9, 1 16, fig. 3). All the figured specimens are from middle Ordovician Hornstein erratic boulders nos. Sy 52 (nos. 2528, 2529, 2531, 2532, 2534, 2535) and Sy 108 (nos. 2527, 2530, 2533) of the Upper Kaolinsand (Lower Pleistocene), near Braderup, Isle of Sylt (N Frisian Is., N Sea), Germany; lat. 54° 56' N, long. 8° 21' E; coll, by Ulrich von Hacht in 1978 and 1979. Species of Airina with adult females 0.64- 0.77mm long. Cavum lies in a weak sulcal depression; slit-like caval opening moderately long, has a dorsal prolongation in the form of a very narrow rudimentary slit. At dorsal border two strong plical elevations form an epicline dorsum. No connection between posterior bow of the plica and the posteroventral spine. Explanation of Plate 9, 1 1 2 Fig. 1, 9 RV, ext. lat. (GPIMH 2528, 644Mm long); fig. 2.9LV, ext. lat. (GPIMH 2529, 762p,m long); fig. 3, juv. car. (GPIMH 2530, 537Mm long). Scale A (lOO^im; x 120), fig. 1; scale B (100ju,m; x 100), figs. 2, 3. ext. vent. — l— 1- 1 l 1 -Tf- ■Tr 1 1 ±1 ~rr I— M- I I I .Lli. I. I ' t-+T" Stereo- Atlas of Ostracod Shells 9, 110 Airina amabilis (2 of 8) l_i- -14 h — h- Stereo-Atlas of Ostracod Shells 9, 1 1 2 Airina amabilis (4 of 8) M- i -r r -I- . Stereo- Atlas of Ostracod Shells 9, 1 1 3 Airina amabilis (5 of 8) Remarks: Sidaraviciene (op. cit., 1976, 1979), author of the genus Airina ( Paleontologija i stratigrafija Pribaltiki i Belorussii = Palaeontology and Stratigraphy of the Baltic and the Byelorussia, 3, 25, 1971), placed this species in Brevibolbina, as did Sarv (op. cit. 1959). Brevibolbina differs markedly, mainly by having a sulcus developed not as a cavum but as a graben, by its distinct conical pre- adductorial node and especially by its “false brood pouch” with its strongly convex dolonate botulus (Schallreuter, Stereo-Atlas Ostracod Shells, 6, 72; 6, 74, 1979). Airina possesses a typical admarginal botulate antrum. In the original description of Airina type-species Hallatia cornuta Neckaja (in Abushik et al., Trudy VNIGRI, 115 = Mikrofauna SSSR, 9, 247, 1958), no cavum is mentioned. The holotype (op. cit., pi. 2, fig. 7) only exhibits a weak sulcus. I suppose that the caval slit is hidden by material so that only the sulcal depression (also present in A . amabilis) is seen. If this is not the case and Airina cornuta does not possess a cavum, A. amabilis would belong to a new genus. Airina adducta Sidaraviciene, 1971 (op. cit., 25-26, pi. 1, fig. 1) shows a distinct caval slit. In this respect and in its antral morphology (cf. Sidaraviciene 1971, fig. lb and PI. 9, 110, fig. 2) this species is very similar to A. amabilis. A. adducta differs from A. amabilis mainly by its larger size (1.00mm long), its missing (or weak ?) dorsal plica and its (presumably cristal) keel between the dorsal border and its posteroventral spine. Airina mezciemensis Gailite ( Fauna i stratigrafija paleozoja i mesozoja Pribaltiki i Belorussii = The Fauna and Stratigraphy of Paleozoic and Mesozoic of Baltic and Byelorussia, 49-50, pi. 1, figs. 6a -b, 1975) is larger (99 : 0.90- 1.1 0 mm) than A. amabilis, possesses a shorter caval slit and lacks plical elevations. A keel similar to that in A. adducta is present posterocentrally and posteroventrally in A. mezciemensis, forming a spine-like projection which distinctly overlaps the free margin in lateral view. In A. adducta this projection does not reach over the free margin and in A. cornuta it only slightly overlaps the free margin. Explanation of Plate 9, 1 14 Figs. 1, 2, incomplete^ LV (GPIMH 2531, 640yum long): fig. 1, ext. lat. ; fig. 2, ext. vent. Fig. 3, juv. RV, ext. lat. (GPIMH 2532, 590/um long). Scale A (lOOyum; x 130), figs. 1, 2; scale B (lOOyurn; x 90), fig. 3. .Hi -t-r— i - _l_l _J Stereo- Atlas of Ostracod Shells 9, 1 1 5 Airina amabilis (7 of 8) -M--+ Remarks (contd.): A. amabilis (Kukruse-Kerla stages; C2-D:), A. adducta (Oanda-Rakvere stages D3-E), A. cornuta (F,) and A. mezciemensis (Pirgu Stage, FiC) form a phylogenetic lineage. In A. amabilis a strong dorsal plica and separate posteroventral spine is present. In A. adducta the plica is lacking and there is a keel-like connection between the posterior plical bow and the posteroventral spine. In A. adducta the keel reaches the dorsal border and the posteroventral spine does not overlap the free margin (Sidaraviciene, op. cit., pi. 1, fig. la, 1971). In A. cornuta the keel also reaches the dorsal border and the posteroventral spine slightly overlaps the free margin (Abushik et. al., op. cit., pi. 2, fig. 7a). In A. mezciemensis the keel is present only in the posterocentral and posteroventral regions and the posteroventral spine distinctly overlaps the free margin in lateral view (Gailite, op. cit., pi. 1, fig. 6a). Sarv (op. cit., 142, 1959) considered Ctenobolbina ? aff .obliqua of Opik ( Tartu ulikooli j.o. loodusuurijate seltsi aruanded =Ann. soc. rebus naturae invest. Univ. Tartu constitutae, 43 (1/2) 100; respectively Tartu ulikooli geol.-inst. toimetused =Publ. geol. Inst. Univ. Tartu, 50, 36, 1937) conspecific with Brevibolbina amabilis. This seems not to be not the case because of the sigmoidal sulcus, missing dorsal elevations and other distinguishing features of ‘C. obliqua' . A. amabilis is another good example of the sulcal sculpture called (Schallreuter, Ber. geol. Ges. DDR, 9 (3), 390-391, 1964; 10 (4), 482-483, 1965) a cavum. A cavum consists of a relatively large inner ‘bubble’ of shell material which has only a small slit-like external opening. The function of the cavum is unknown; perhaps it was some kind of buoyancy organ. Distribution: NW Russian Platform (Leningrad, Estonia, Lithuania): Kukruse (C2)-Keila stages (D2), upper part of Viru Series (middle Ordovician). Lower upper part of Viru Series in Hornstein erratic boulders of the Upper Kaolinsand (Lower Pleistocene) near Braderup, Isle of Sylt (N Frisian Is., N Sea), Germany. Explanation of Plate 9, 1 1 6 Fig. 1,? LV, int. lat. (GPIMH 2533, 710/um long); fig. 2,? RV, int. lat. (GPIMH 2534, 638yu.ni long); fig. 3, juv. LV, ext. lat. (GPIMH 2535, 506/um long). Scale A (100/um; x 105), figs. 1, 3; scale B (100/um; x 125), fig. 2. i Stereo- Atlas of Ostracod Shells 9, 114 Airina amabilis (6 of 8) I— J- L - I I I I Stereo- Atlas of Ostracod Shells 9, 116 Airina amabilis (8 of 8) i- r H T Stereo- Atlas of Ostracod Shells 9 (21) 117-124 (1982) 595.337.12 (119.9) (943 : 163.145.21) : 551.312 Bennelongia tunta (1 of 8) ON BENNELONGIA TUNTA DE DECKKER sp. nov. by Patrick De Deckker ( Australian National University, Canberra) 1981 Bennelongia tunta sp. nov. Bennelongia sp. De Deckker, Trans. R. Soc. S. Aust., 105, 95, fig. 8r. Holotype: Type locality: Derivation of name: Figured specimens: Diagnosis: Australian Museum, Sydney, dissected d, P32574. Billabong (20° 12' 23" S, 145° 58' 41" E) at the northern end of Lake Powlathanga, very close to Powlathanga Homestead, 35 km W of Charters Towers, Queensland, Australia. Material collected by P. De Deckker (4. VI. 1981). From an Aboriginal language of Queensland meaning spear in reference to the numerous denticles along a great part of the periphery of the left valve. Australian Museum, Sydney nos. P32574 (holotype d car.; LV: PI. 9, 124, figs. 1-2; RV: PI. 9, 124, fig. 3; Text-fig. 1 B-E; Text-fig. 2A, C-H), P32575(tfLV: PI. 9, 118, fig. 3), P32576 (9 car.; LV: PI. 9, 120, fig. 1; RV: PI. 9, 120, fig. 2; Text-fig. 2E), P32577 (9 RV: PI. 9, 118, fig. 2, Text-fig. 1A, F), P32578 (cf car.: PI. 9, 120, fig. 3), P32579 (9car.: PI. 9, 122, fig. 2), P32580 (9 car.: PI. 9, 118, fig. 1; PI. 9, 122, fig. 4), P32581 (juv. car.: PI. 9, 122, fig. 1); P32582 (juv. car.: PI. 9, 122, fig. 6), P32583 juv. (RV: PI. 9, 122, fig. 3; LV: PI. 9, 122, fig. 5). All from type locality. Oblong shell with LV the larger and forming a dorsal “keel” which embraces the shorter and more ellipsoidal RV; periphery of LV denticulated antero- and posterodorsally and of RV ventrally. Explanation of Plate 9, 1 1 8 Fig. l,9car., ext. rt. lat. (P32580, 2200/am long); Fig. 2,9RV, ext. lat. (P32577, 1965/am long); fig. 3,d'LV, ext. lat. (P32575, 2160/am long). All paratypes. Scale A (1000/am; x 28), figs. 1-3. -LlJ T-t-t -+-r — t -M-H JiJ -M- + -t--t — Stereo- Atlas of Ostracod Shells 9, 1 1 9 Bennelongia tunta (3 of 8) Diagnosis (contd): Remarks: Distribution: Valves asymmetrical especially anteroventrally where the larger LV is beak-shaped with broad concave depression posterior to the beak; RV almost smoothly curved except for narrow and pointed beak-shaped structure at edge. Lateral lobe and distal end of inner lobe of hemipenis both pointed and curved inward. B. tunta can swim actively and has a green shell. The small, smooth and narrow claw fixed on the inner side of the last segment of the male antenna (Text-fig. ID) is longer, broader and denticulated in females. Other species of Bennelongia, which like B. tunta are characterized by a conspicuous inner list forming a lip-like flap anteroventrally only in the LV, have been recently described or reviewed in De Deckker (Trans. R. Soc. S. Aust., 105, 91-138, 1981) and De Deckker and McKenzie (ibid 105, 53-58, 1981). B. tunta is easily distinguished from other species of the genus by the following features: rectangular outline of the shell, much narrower shape in dorsal view, prominent dorsal “keel” seen on taller LV; lateral lobe of hemipenis in shape of a bird of prey’s beak. The ventral area of both valves is characterized by a number of small pustules which are closely arranged in rows; these are best seen near the mouth region. Arrangement of adductor muscle scars (see PI. 9, 120, fig. 1) like that of B. harpago as illustrated on Fig. 7 in De Deckker and McKenzie (op. cit.) except that the central scar in the posterior row is missing in B. tunta. Undissected paratype material of B. tunta is deposited at the Australian Museum under no. P32584. B. tunta was originally recorded from Cauckingburra Swamp (collected by Dr B. V. Timms, 16. VII. 1974, see De Deckker, 1981 op. cit.) near Lake Buchanan, SW. of Charters Towers in Queensland. It was re-collected on 3. VI. 1981 by P.D.D. It also has been found some 400km S. of Charters Towers in 3 adjacent roadside swamps on the northern side of the road between Alice and Barcaldine (20km E. of Barcaldine and 2 km E. of Geera Railway Station) on 30.V.1981 by P.D.D. The type locality is on the W. of Charters Towers. Explanation of Plate 9, 120 Fig. 1,9 LV, int. lat. (P32576, 2340/am long); fig. 2,9 RV, int. lat. (P32576, 2060/am long); fig. S.d'car., ext. It. lat. (P32578, 20251am long). All paratypes. Scale A (1000/am; x 28), figs. 1-3. -TV ■tr -_L±_L I Stereo- Atlas of Ostracod Shells 9, 118 J-L I I I I I I I I -i-r Bennelongia tunta (2 of 8) f-rt- i-t-t- “IT IT I— i- U Bennelongia tunta (4 of 8) M- t-r- Explanation of Plate 9, 1 24 Figs. 1-3, car. (holotype, P32574), figs. 1, 2, LV, ant. int. lat. at different angles; fig. 3, RV, ant. int. lat. Scale A (500/nm; x 55), figs. 1-3. Explanation of Plate 9, 1 22 Fig. 1, juv. car., ext. It. lat. (P32581, 1050/u,m long); fig. 2,$?car., ext. vent. (P32579, 2170jum long); fig. 3, juv. RV, int. lat. (P32583, 1680/u.m long); fig. 4, juv. car., ext. dors. (P32580, 2200/u.m long); fig. 5, juv. LV, int. lat. (P32583, 1680/u.m long); fig. 6, juv. car., ext. rt. lat. (P32582, 1335ju.m long). All paratypes. Scale A (lOOO^m; x 28), figs. 1-6. Stereo- Atlas of Ostracod Shells 9, 123 Bennelongia tunta (7 of 8) Text-fig. 2,d'(holotype, P32574) A: thoracopoda I; C: mandibular palp; D: thoracopoda II; E: hemipenis; F: furca; G: Zenker organ; H: furcal attachment. 9 (paratype, P32576) B: rake-like organ. Scale 1: 100/u.m for A, C-H; 2: lOO/rm for B. -t-t -ti- JJJ -M-4- -Ll_l Stereo- Atlas of Ostracod Shells 9, 121 -r-t— t- Bennelongia tunta (5 of 8) Text-fig. l,?(paratype, P32577) A: maxillular processes and palp; F: maxillar palp.d'(holotype, P32574)B: antennula, C: left maxillar palp; D: antenna; E: right maxilla. FT- L±X. t' + T' Stereo- Atlas of Ostracod Shells 9, 122 Bennelongia tunta (6 of 8) — hi — — J— 1_ ±_l. Stereo-Atlas of Ostracod Shells 9, (22) 125-132 (1982) 595.337.12 (119.9) (941.163.116.33) : 551.312.2 Caboncypris nunkeri (1 of 8) ON CABONCYPRIS NUNKERI DE DECKKER gen. et sp. nov. by Patrick De Deckker (Australian National University, Canberra) Derivation of name: Diagnosis: Remarks: Holotype: Type locality: Derivation of name: Genus Caboncypris gen. nov. Type species: Caboncypris nunkeri sp. nov. From an Aboriginal language of Western Australia meaning large, combined with Cypris. Large size (~ 3mm long), smooth to pseudopunctate shell with broad selvage in both valves and placed far away from outer edge. Ventral overlap of LV over RV. “Sensory” organ on side of 2nd segment of antenna like a tiny depression; distal segment of maxillula elongated; mandibular palp with oc bristle smooth and as long as penultimate segment, fi bristle shorter and tufted, y bristle slightly longer than distal segment and pilose on its distal half; rake-like organ with 6 to 7 teeth plus a bifid one; male maxillar palps asymmetrical; penultimate segment of thoracopoda I weakly divided; furca with 2 claws and 2 smaller setae; furcal attachment simple and bifurcate; Zenker’s organ with more than 60 rosettes. The morphology of the furca (2 claws, 2 setae) and of the furcal attachment (proximal part bifurcate and median part simple) places Caboncypris in the Eucypridinae Bronstein, 1947. Caboncypris nunkeri sp. nov Australian Museum, Sydney, dissected dT32563 Roadside swamp, on edge of Armidale golf course along Forrest road situated E. of Forrestdale Lake, near Perth, Western Australia. Material collected by J. Terni (8. IX. 1981). From an Aboriginal language of Western Australia meaning pretty. Explanation of Plate 9, 126 Fig. l.c/LV, ext. lat. (P32564, 2950/u.m long); fig. 2,c/RV, ext. lat. (P32564, 2740/u.m long); fig. 3, dear., ext. It. lat. (P32567, 2960/am long). All paratypes. Scale A (1000/um; x 20), figs. 1-3. -Ti— t- --t-r --M- iJ. -+-4 Stereo- Atlas of Ostracod Shells 9, 127 Caboncypris nunkeri (3 of 8) Figured specimens: Diagnosis: Remarks: Distribution: Australian Museum, Sydney, Nos. P32563 (holotype, d RV: PI. 9, 128, fig. 2; LV: PI. 9, 128, fig. 3; rake-like organs: PI. 9, 132, fig. 3;Text-fig. l;Text-fig. 2A-I), P32564 (dear.; LV: PI. 9, 126, fig. 1; RV: PI. 9, 126, fig. 2; Zenker’s organ: PI. 9, 132, fig. 2; hemipenis: PI. 9, 132, fig. 4), P32565 (9 maxillular palp: Text-fig. 2E); P32567 (dear.: PI. 9, 126, fig. 3); P32568 (dear.: PI. 9, 130, fig. 1), P32569(9car.: PI. 9, 128, fig. 1; PI. 9, 130, fig. 3), P32570 (danatomy: PI. 9, 130, fig. 2); P32571 (danatomy: PI. 9, 130, fig. 4), P33572 (danatomy: PI. 9, 132, fig. 1). All from type locality. Ellipsoid shell in lateral view with flattened ventral area where two concavities occur, one at \ of length from anterior end and other in middle. LV larger and overlapping RV in dorsal area by forming a narrow “keel”. Selvage prominent throughout and similar in both valves being well removed from outer edge except in mouth region where it is near outer edge at level of anterior concavity. Posteriorly, selvages in both valves interlock with RV selvage external. Maxillular palps of male asymmetrical with inner edge of right grasping organ bearing a lump. Lateral lobe of hemipenis digitate and curved inward; inner lobe broad and tongue-shaped. Furcal claws unequal. Caboncypris differs from the Australian endemic genus Australo cypris, which it closely resembles, by the position of the selvage in both valves which is an important taxonomic feature at generic level in the tribe Mytilocypridini (see De Deckker, Aust. J . Zool. Suppl. Ser. 58, 1-62, 1978), to which Caboncypris belongs. Caboncypris differs from the megalocypridine genera by having a narrow digitate outer lobe on the hemipenis (in Megalocypris it is trapezoid, Apatelecypris tongue-like and Hypselecypris circular shaped); also, the furcal attachment in all these 3 genera has a hook-like process near the articulary extremity whereas none is present in Caboncypris. C. nunkeri has been collected at the type locality on several occasions by J. Terni to whom I am most grateful. It has also been collected once before in 1905 by the Hamburg Scientific Expedition to Western Australia. I wish to thank Prof. G. Hartmann for supplying material from this collection. Explanation of Plate 9, 128 Fig. l,d'car., ext. rt. lat. (paratype, P32569, 3125/xm long); fig. 2,cfRV, int. lat. (holotype, P32563, 2900/u.m long); fig. 3,d'LV, int. lat. (holotype, P32563, 3030/a.m long). Scale A (1000/xm; x 20), figs. 1-3. -Ti~ --rt- J..L + T -1-1- -i~r Stereo- Atlas of Ostracod Shells 9, 126 Caboncypris nunkeri (2 of 8) tt-i-- i-L. I M- t-r “IT “IT Caboncypris nunkeri (4 of 8) +- + Stereo- Atlas of Ostracod Shells 9, 128 i l -l-L— I— I -±1_1 Stereo- Atlas of Ostracod Shells 9, 129 Caboncypris nunkeri (5 of 8) Text-fig. Td^holotype, P32563) A: maxillular processes and palp; B: antennula; C: antenna; D: furca. Fig. l.d'car., ext. vent. (P32568, 2910/am long); fig. 2, d, rt. lat., anatomy and part of LV visible after RV removed (P32570, 3200/am long); fig. 3,$car., ext. dors. (P32569, 3060/am long); fig. 4, d, It. lat. tilted, anatomy and part of RV visible after LV removed (P32571, 2600/am long). All paratypes. Scale A (1000/am; x 20), figs. 1, 3; B(1000/am; x 17.5), fig. 2; C(1000/am; x 25), fig. 4. -r-r — i •-M — 1 H 4-U _l_t _l T M + -(-4 Stereo- Atlas of Ostracod Shells 9, 1 3 1 Caboncypris nunkeri (7 of 8) Text-fig. 2,d'(holotype, P32563) A: furcal attachment; B: left maxilla; C: right maxillar palp; D: mandibular palp; F: mandibular coxale; G: thoracopoda I; H: rake-like organ; I: hemipenis. 9 (paratype, P32565) E: maxillular palp. Scale 1: 100/am for A-D, F-G, I; 2: 100/am for E, H. Fig. 1 , d. It. lat., anatomy after both valves removed (paratype, P32572, 2225/am long); fig. 2,d, Zenker organ (paratype, P32564, 560/am long); fig. 3,d, hemipenis (paratype, P32564, 560/am long); fig. 3, o , rake-like organs (holotype, P32563); fig. 4 ,d, hemipenis (paratype, P32564, 760/u.m long). Scale A (1000/am, x 28), fig. 1; B (200/am; x 115), figs. 2, 4; C (100/am; x 185), fig. 3. TT t r — 1~ i -i-i I Lli I l~T Stereo- Atlas of Ostracod Shells 9, 130 J -i Caboncypris nunkeri (6 of 8) -i-rt" - 1 — hi — I — J_ 1 — H — t- Stereo- Atlas of Ostracod Shells 9, 132 '“IT -IT -14. Caboncypris nunkeri (8 of 8) H- t— r i f IT i- r r Tr i — 1 4- Stereo-Atlas of Ostracod Shells 9 (23) 133-140 (1982) 595.337.12 (119.9) (948.163.132.13) : 551.312.4 Cypretta yapinga (1 of 8) ON CYPRETTA YAPINGA DE DECKKER sp. nov. by Patrick De Deckker (Australian National University, Canberra) Cypretta yapinga sp. nov. Holotype: Type Locality: Derivation of name: Figured specimens: Australian Museum, Sydney, dissected d, P32557. Mudginberri Lagoon, a billabong along Magela Creek (lat. 12° 36' S, long. 132° 52' E), some 200km E of Darwin, Northern Territory, Australia. Material collected by Dr. R. Marchant (17.1.1980). From an Aboriginal language of the Northern Territory, meaning big. Australian Museum, Sydney nos. P32556 (d car.; LV: PI. 9, 136, fig. 2; RV: PI. 9, 136, fig. 3; PI. 9, 140, fig. 1; Zenker’s organ: PI. 9, 140, fig. 3; Text-fig. 1; Text-figs. 2 C-H), P32557 (holotype d'car.; LV: PI. 9, 134, fig. 1; RV: PI. 9, 134, fig. 3; hemipenis: PI. 9, 140, fig. 2; Zenker’s organ: PI. 9, 140, fig. 5), P32558 (? LV: PI. 9, 134, fig. 2; Text-figs. 2A-B), P32559($LV: PI. 9, 136, fig. 1), P32560 (d car.: PI. 9, 138, fig. 1; PI. 9, 140, fig. 4), P32561 (d'car.: PI. 9, 138, fig. 3), P32562 (?car.: PI. 9, 138, fig. 2). All from type locality. Explanation of Plate 9, 134 Fig. l,cS'LV, ext. lat. (holotype, P32557, 900^m long); fig. 2,$LV, ext. lat. (paratype, P32558, 1010/am long); fig. 3,d'RV, ext. lat. (holotype, P32557, 975/u.m long). Scale A (500/am; x 58), figs. 1-3. IT— t— - rrr I--M- 1-4-4- t- t-- Stereo- Atlas of Ostracod Shells 9, 135 Cypretta yapinga (3 of 8) Diagnosis: Shell triangular in lateral view with length-height ratio between 1.4 and 1.5; greatest height at Remarks: Distribution: about middle. Dorsal area, where left valve is embraced by right and at the point of greatest height, forming a conspicuous pointed boss. In front of the boss, shell broadly curved but behind it is steeply inclined. Selvage in same position in both valves but much broader in right valve. Furca without anterior seta or with a miniscule one. Lateral lobe of hemipenis tongue-shaped and outer lobe small and wedge-shaped. For outline see Text-fig. 2F. Zenker’s organ with about 17 rosettes. When preserved in alcohol, the shell of C. yapinga is colourless. This species possesses the radial septae (PI. 9, 140, fig. 1) best seen in transparent light as in all Cypretta species. However, the row of posteroventral nodes on the inner lamella in RV typical of the genus could not be seen in C. yapinga. A general review of Cypretta species is available in Sohn and Kornicker ( Smithson . Contr. Zool. 141, 1973) and shows that C. yapinga is one of the largest species known in the genus. It is also represented by both sexes, a fairly uncommon feature for Cypretta species. In females, there is an additional claw attached to the last segment of the antenna; it is 2L the length of the other claws and is thinner. Undissected specimens of C. yapinga are deposited in the Australian Museum under no. P32565. So far C. yapinga has only been recorded from the type locality. For more details on Mudginberri Lagoon see Marchant Aust. J. mar. Freshwat. Res. 33, 329-342, 1982). At the time of collection (17.1.1980) pH of the water was between 6 and 7, water temperature close to 30°C and water was turbid. The sample was collected in the littoral zone, over submerged grass and macrophytes. I wish to thank R. Marchant for this information and the specimens. Uranium mining (Ranger Uranium Mine) has recently started near Magela Creek and C. yapinga could prove to be an ideal biological “sensor” to study the input of metals in the creek waters and which could be taken up by the organisms in their shells in the billabongs along the Creek. Explanation of Plate 9, 136 Fig. 1 ,9 LV, int. lat P32559, 960/xm long); fig. 2, dCV, int. lat. (P32556, 950/u.m long); fig. 3,c(RV, int. lat. ( P32556, 990pm long). All paratypes. Scale A (500^.m; x 58), figs. 1-3. J-4-L _L. 1 1 I I I I .Lii. - — 1- + T Stereo- Atlas of Ostracod Shells 9, 134 Cypretta yapinga (2 of 8) i— l-t-- i-i-t-- LJ.L r I- -i—t- Stereo- Atlas of Ostracod Shells 9, 136 Cypretta yapinga (4 of 8) t- T “IT ’ ' TT Explanation of Plate 9, 1 40 Fig. 1,