A Stereo-Atlas of Ostracod Shells edited by I. Boomer, D. J. Horne, A. R. Lord and D. J. Siveter Volume 25, Parts 1 and 2; 1998 Published under the aegis of the British Micropalaeontological Society, London ISSN 0952-7451 Editors Dr Ian Boomer, Department of Geography, University of Newcastle, Newcastle-upon-Tyne, NEl 7RU. Tel: +191 222 5111; Fax: +191 222 5241; Email: ian.boomer@ncl.ac.uk. Dr David J. Horne, School of Earth Sciences, University of Greenwich, Chatham Maritime, Kent, ME4 4AW. Tel: +181 331 9841; Fax: +181 331 9805; Email: d.j.horne@greenwich.ac.uk. Professor Alan R. Lord, Department of Geological Sciences, University College, Gower Street, London WCIE 6BT. Tel: +171 380 7131; Fax: +171 388 7614; Email: dean.maps@ucl.ac.uk. Dr David J. Siveter, Department of Geology, The University, Leicester LEI 7RH. Tel: +116 523925; Fax: +116 523918; Email: djs@leicester.ac.uk. Editorial Board Dr J.-P. Colin, Esso Production Research - European, 213 Cours Victor Hugo, F-33321 Begles, France. Dr M.A. Ayress, Ichron Ltd., 16 Dalby Court, Gadbrook Business Centre, Rudheath, Northwich, Cheshire, CW9 7TN. Dr R.E.L. Schallreuter, Geologisches-Palaontologisches Institut, Universitat Hamburg, Bundesstrasse 55, D-20146 Hamburg, Germany. Professor N. Ikeya, Institute of Geosciences, Shizuoka University, Shizuoka 422, Japan. Subscriptions Subscriptions should be sent to Prof Alan Lord at the above address. Subscriptions can be made by credit card (for which there is a £1 surcharge). Officers of the British Micropalaeontological Society Chairman: Prof R.J. Aldridge, Department of Geology, The University, Leicester LEI 7RH. Secretary: Dr A.J. Powell, Dinosystems, 37 Alton Road, Richmond, Surrey, TW9 lUJ. Treasurer: Dr J.B. Riding, British Geological Survey, Keyworth, Nottingham, NG12 5GG. Membership Treasurer: Dr L.T. Gallagher, Network Stratigraphic Consulting Ltd., Unit 57, The Enterprise Centre, Cranbourne Road, Potters Bar, Hertfordshire EN6 3DQ. Editor, Journal of Micropalaeontology: Prof. Malcolm Hart, University of Plymouth. Editor, Newsletter of Micropalaeontology: Phil Donoghue, University of Birmingham. Calcareous Nannofossil Group: Chairman - Jeremy Young; Secretary - Matthew Hampton. Conodont Group: Chairman - Giles Miller; Secretary - Gail Radcliff. Foraminifera Group: Chairman - Norman McLeod; Secretary - Mike Kaminski. Ostracod Group: Chairman - Matthew Wakefield; Secretary Ian Slipper. Palynology Group: Chairman - Dave Jolley; Secretary - Duncan McLean. Instructions to Authors Contributions illustrated by scanning electron micrographs of Ostracoda in stereo-pairs are invited. All contributions submitted for possible publication in A Stereo-Atlas of Ostracod Shells are peer-reviewed by an appropriate inter- national specialist. “Instructions to Authors” and plate blanks for mounting micrographs may be obtained from Dr Ian Boomer at the address above. Manuscripts should be submitted with a copy of the text on disc in MS Word 6 for Windows (PC) or Rich Text Format (RTF). The editors wish to thank Dr Eugene Kempf (University of K51n) for his assistance in preparing this issue. The front cover shows the holotype (RV, NHM no. OS 14850, upper, dorsal view and lower, external lateral view) of Hemiparacytheridea larw’oodi Boomer, 1996 from the Oligocene of ODP Site 865B, Central Pacific Ocean. This species was described in A Stereo-Atlas of Ostracod Shells. 22, 116-119. A Stereo-Atlas of Ostracod Shells edited by I. Boomer, D. J. Horne, A. R. Lord and D. J. Siveter Volume 25, 1998 Published under the aegis of the British Micropalaeontological Society, London Stereo-Atlas of Ostracod Shells 25, ii Contents Contents 1 On Ginginella maudriseensis sp. nov.; by S. Majoran 1 2 On Fuscinullina (Fuscinullina) pectinata Kanygin; by R.E.L. Schallreuter 5 3 On Callistocythere pumila Hanai; by A. Tsukagoshi 9 4 On Darwinula stevensoni Brady & Robertson; by G. Rosetti, D.J. Horne & K. Martens 17 5 On Beckerhealdia circumreptata Blumenstengel; by G. Becker 23 6 On Egorovellina operosa Kanygin; by R.E.L. Schallreuter 27 7 On Bumire pilloides Schallreuter; by R.E.L. Schallreuter 31 8 On Muhuaella spinosa gen. et sp. nov.; by E. Olempska 35 9 On Editella dawubaensis gen. et sp. nov.; by E. Olempska 39 10 On Schizocythere ikeyai Tsukagoshi & Briggs sp. nov.; by A. Tsukagoshi & W.M. Briggs Jr. 43 1 1 On Vania perdita Krhta & Siveter gen. et sp. nov.; by M. Krhta & D.J. Siveter 53 12 On Swainocythere minusculum (Ruggieri) Errata; by I. Boomer & E. Kempf 57 13 Index for volume 25 (for 1998) 58 Stereo-Atlas of Ostracod Shells 25 ( 1 ) 1-4 (1998) Ginginella maudhseensis (1 of 4) 595.337.1 (1 16.333.3) (269.4 : 163.003.65) : 551.352 ON GINGINELLA MAUDRISEENSIS MAJORAN sp. nov. by Stefan Majoran (Department of Marine Geology, Goteborg University, Sweden) Ginginella maudriseensis sp. nov. Department of Marine Geology, Goteborg University, Sweden, no. DMGUG.SAtl.29; RV Maud Rise, Southern Ocean, Ocean Drilling Program, Leg 113, Hole 689B (64°31.0'S, 03°06.0'E) Core 25, core catcher (0-1 cm); Late Maastrichtian, Abathomphalus mayaroensis Zone. With reference to the type locality Maud Rise, Southern Ocean. Department of Marine Geology, Goteborg University, Sweden, nos DMGUG.SAtl.28 {adult LV; PI. 25, 2, fig. 1 ), DMGUG.SAtl.30 (adult RV: PI. 25, 2, fig. 2), DMGUG.SAtl.29 (holotype, adult RV: PI. 25, 2, fig. 3), DMGUG.SAtl.31 (adult RV: PI. 25, 4, fig. 1), DMGUG.SAtl.33 (adult LV: PI. 25, 4, fig. 2), DMGUG.SAtl.32 (adult LV: PI. 25, 4, fig. 3). All from Maud Rise. Leg 1 13, Hole 689B (64°31.0'S, 03°06.0'E); Late Maastrichtian, Abathomphalus mayaroensis Zone. A species of Ginginella with a posterior margin provided with a stout semicircular aspinose ridge. Valve subrectangular to subtrapezoid in lateral view. Greatest height at the anterior cardinal angle from which the dorsal and ventral margins converge slightly towards the posterior. Anterior margin broadly rounded. Posterior margin, as seen in internal view, gently convex along its ventral part where it is continuous with the ventral margin; the posterior extremity is at mid-height; the dorsal part of the posterior margin is subvertical in the left valve, more rounded in the right valve; it forms an angle with the dorsal margin at the posterior cardinal angle. Anterior and posterior margins each furnished with a distinct ridge. In dorsal view, the marginal ridge and valve margin are separated by a furrow which bears minor transverse ridgelets. Postadjacent and adjacent to the antero- and posteromarginal ridges, respectively, there is a moat-like compression of the valve surface. The anterior and posterior ridges are continuous with a common ventral ridge, which shows a protrusion posteroventrally. Dorsally, the anteromarginal ridge is continuous with the dorsal margin. Holotype: Type locality: Derivation of name: Figured specimens: Diagnosis: Explanation of Plate 25, 2 Fig. 1, LV, ext. lat. (holotype, DMGUG.SAtl.28, 447pm long). Fig. 2, RV, ext. dors. (DMGUG.SAtl.30, 440pm long). Fig. 3, RV, ext. lat. (DMGUG.SAtl.29, 441pm long). Scale A ( 100 pm; X 160), figs. 1-3. Stereo-Atlas of Ostracod Shells 25, 3 Ginginella maudriseensis (3 of 4) The posteromarginal ridge forms an angular junction of 120° with a distinct dorsomedian ridge at the site of the posterior cardinal angle. Posterior half of the valve below the dorsomedian ridge is irregularly ornamented with rather broad and smooth muri disrupted by cavities which in some specimens contain secondary reticulation and pores. Anteromedian region of the valve surface is generally smooth. Size and outline of inner lamella typical for the genus. Hinge modified merodont, although the characteristic generic crenulation of the median hinge-bar is not clearly visible (possibly as a consequence of suboptimal preservation). Internal muscle-scars not observed. Remarks: As noted by Neale (Spec. Pap. Palaeont, 16, 41^1, 1975) there is a close relationship between the genus Ginginella, (originally described from the Santonian of Western Australia by Neale op. cit., pi. 1, fig. 8, pi. 6, figs. 1-3, 1975) and the genus Munseyella Van den Bold (Micropaleontology, 3, 7, 1957). The costate ornamentation of the new species is more characteristic of the genus Ginginella than Munseyella. The type-species G. ginginensis (see J. W. Neale, op. cit. \ and R. H. Bate, Spec. Pap. Palaeont, 10, 78, pi. 9, figs. 8-13, 1972) differs mainly from the new species in the nature of the interrupted marginal ridge posterodorsally. The occurrence of the present forms at a palaeodepth of 1200 m (E. Thomas, Proc. Ocean Drill. Prog. (Sci. Res.), 113, 901-914, 1990) where the palaeotemperature was approximately 9°C (L. D. Stott & J. P. Kennett, Proc. Ocean Drill. Prog. (Sci. Res.) 113, 829-848, 1990), is in contrast to the epi-neritic, warm-water preference of the genus Munseyella (F. P. C. M. van Morkhoven, Post-Palaeozoic Ostracoda II, 1 15-1 17, figs. 166-171, 1963). The genus Munseyella is rare in the South Atlantic; it is more common in the North Americas, Far East and Australasia. Bertels (Micropaleontology 19, 327, pi. 2, figs. 3a-b, 1973; Micropaleontology 21, 116, pi. 6, figs, la-b, 1975) recorded a few species of this genus from the early Tertiary and Maastrichtian of Argentina, none of which are particularly similar to the present species. The Eocene Munseyella bungoona McKenzie et al. (Revta esp. Paleont., 8, 94-97, pi. 4, figs. 2-17, pi 8, figs. 7-10, 1993) from Australia is similar to the present forms with respect to the presence of an aspinose posteromarginal ridge. There is no other known Tertiary or Quaternary species of Munseyella described from Australia and New Zealand which is similar to the present form (see McKenzie et al, op. cit.; Swanson, N. Z. ocean. Inst. Mem., 78, 19-21, figs. 22-24, 1979; Whatley & Downing, Revta esp. Micropaleont., 15, 379-380, pi. 6, figs. 18-20, 1983). Distribution: Known only from the type locality. Explanation of Plate 25, 4 Fig. 1, RV, int. lat. (DMGUG.SAtl.31, 430 pm long). Fig. 2, LV, ext. dors. (DMGUG.SAtl.33, 440 pm long). Fig. 3, LV int. lat. (DMGUG.SAtl.32, 441 pm long). Scale A (100 pm; X 160), figs. 1-3. ' ll i*>"Ai'34!i Stereo-Atlas of Ostracod Shells 25, : Ginginellu maudriseensis (2 of 4; Stereo-Atlas of Ostracod Shells 25, 4 Ginginella maudriseensis (4 of 4) Stereo-Atlas of Ostracod Shells 25 (2) 5-8 (1998) FuscinuUina (Fuscinullina) pectinata (1 of 4) 555.336.13 (1 13.311)(57 : 161.150.64) : 551.351 ON FUSCINULLINA {FUSCINULLINA) PECTINATA KANYGIN by Roger E. L. Schallreuter (University of Hamburg, Hamburg, Germany) Genus FUSCINULLINA Kanygin, 1967 Type species (by original designation): Fuscinullina pectinata Kanygin, 1967 Diagnosis: A medium sized genus of the Soanellidae (Hollinacea). Trilobate; lobes LI and L2 united to form one lobe (Ll/2); sulci S2 and S3 and lobes L3 and L4 are also present. Remarks: According to A.V Kanygin (Ostrakody ordovika gornoj sistemy Cherskogo, 70, 1967) the three lobes repre- sent LI, L2 and L3, while the two sulci between them represent S2 and S3. This designation can not be correct because, in lobate Palaeozoic ostracods, S2 and S3 are never considered to be anterior of L2 and L3. Thus Kanygin ’s numbering of the sulci was correct, but not that of the lobes. VA. Ivanova (Trudy Paleont. Inst. Akad. naukSSSR, 172, 170, 1979) designated the lobes correctly but in 1990 (Practical manual on microfauna of the USSR, 4, 63) again used the (original) incorrect numbering for the lobes. Fuscinites Ivanova, 1979 (op. cit., 176) is herein considered to be only a subgenus of Fuscinullina. Fuscinullina (Fuscinites) differs from Fuscinullina (Fuscinullina) by lacking ridges on Ll/2. Occurrence: Lower and middle Ordovician, NE Siberia. Explanation of Plate 25, 6 Figs. 1, 2, LV (holotype, 256/53a, 1.65 pm long): fig. 1, ext. lat.; fig. 2, ext. vent. Fig. 3, RV ext. lat. (256/53b, 1.60 pm long). Scale A (250 pm; X43), figs. 1-3. Stereo-Atlas of Ostracod Shells 25, 7. Fuscinullina (Fuscinullina) pectinata (3 of 4) Fuscinullina (Fuscinullina) pectinata Kanygin, 1 967 1967 Fuscinullina pectinata gen. et sp. nov. A.V. Kanygin, Ostrakody ordovika gornoj sistemy Cherskogo, 69-71, 92, 93, 106, 110, 111, 121, 132, 135, 137, 139, 140, 150, figs. 5 (Fuscinullina sp.), 11,12 (Fussimullina), tables 2 (p. 1 17), 4 (Fuscinllina), 8 (p. 88), 9 (p. 90), pi. 10, figs. 4-9. 1971 Fuscinullina pectinata Kanygin; A.V Kanygin Trudy Inst. geol. geofiz. Sibirsk. otd. Akad. nauk SSSR, (IGiG), 128, 63-64, 92, 93, 97, 106, tables 8 (p. 88), 9 (p. 90), pi. 14, figs. 2-5. 1979 Fuscinullina pectinata Kanygin; VA. Ivanova, Trudy Paleont. Inst. Akad. nauk SSSR, 172, 169, 170, pi. 16, fig. 2. 1985 Fuscinullina pectinata Kanygin; A.V Kanygin, Trudy IGiG, 615, 7. 1986-7 Fuscinullina pectinata Kanygin; E.K. Kempf, Geol. Inst. Univ. Koln Sonderveroff, 50, 361, 51, 437, 52, 483. 1990 Fuscinullina pectinata Kanygin; A.V. Ivanova, Practical manual on microfauna of the USSR, 4, 63, 233, pi. 8, fig. 10. Holotype: Institute of Geology and Geophysics, Siberian branch of the Russian Academy of Sciences, Novosibirsk (IGiG), no. 256/53a; left valve. Type localitv: Charkindzha Stream, Omulev Mountains, NE Siberia; Sien Formation, lower Ordovician, (approximately 64°N, 150°E). Figured specimens: Institute of Geology and Geophysics, Siberian branch of the Russian Academy of Sciences, Novosibirsk (IGiG), nos. 256/53a (LV: PI. 25, 6, figs. 1, 2), 256/53b (RV: PI. 25, 6, fig. 3; PI. 25, 8, fig. 3) and 256/53v (LV: PI. 25, 8, figs. 1, 2). All specimens from the type locality (holotype: sample 62080; other from sample 62084). Diagnosis: As for the genus which is currently monotypic. Distribution: Lower and middle Ordovician, NE Siberia, Russia. Sien Formation, Charkindzha Stream, West Omulev Mountains; Taryn-Yuryakh Formation, Unga Stream, Selennyakh Range, and middle Sakkyryr Formation, Vodopadnyj Stream, Sette-Daban Ridge, Verchojan Mountains. Acknowledgements: I thank Dr. A.V. Kanygin (Russian Academy of Sciences, Novosibirsk) for loan of the type material. Explanation of Plate 25, 8 Figs. 1, 2, LV (256/53v, 1.63 mm long): fig. 1, ext. lat.; fig. 2, ext. vent. Fig. 3, RV, ext. vent. (256/53b, 1.60 mm long). Scale A (250 pm; X43), figs. 1-3. Stereo-Atlas of Ostracod Shells 25. 6 Fiiscimdliua (FuscinuUina) pectinata (2 of 4) Stereo-Atlas of Ostracod Shells 25 (3) 9-16 (1998) Callistocythere pumila (1 of 8) 595.337.1 (119.9) (520 : 161.130.32 + 137.37 + 130.15 ) ; 551.351 ON CALLISTOCYTHERE PUMILA HANAI by Akira Tsukagoshi (The University Museum, University of Tokyo, Tokyo, Japan) Callistocythere pumila Hanai, 1957 1957 Callistocythere pumila sp. nov.; Hanai, T. J. Fac. Sci. Univ. Tokyo, 10, pi. 10, figs. 2a-c. 1975 Callistocythere pumila', Okubo, I. Proc. Jap. Soc. Syst. ZooL, 11, fig. 1. 1979 Callistocythere laevis sp. nov.; Okubo, I.. Res. Crust. (Carcinol. Soc. Japan), 9, text-fig. 5, pi. 2, figs. e-h. 1998 Callistocythere pumila', Yamane, K. Bull. Ehime Pref. Sci. Mus., 3, pi. 3, fig. 5. Holotype: The University Museum, The University of Tokyo [UMUT] no. CA 2578; a carapace without soft parts (Length=0.49 mm, Height=0.25 mm, Width=0.21 mm). [Paratypes: nos. UMUT CA 2579-2581]. Type locality: A shore about 1 kmN.E. of Akase railroad station, Uto City, Kumamoto Pref., Kyushu, Japan. ( 131°16'E, 32°40'N). Figured specimens: The University Museum, The University of Tokyo [UMUT] nos. CA 2578 (Holotype 9 car.: PI. 25, 14, figs. 1, 2), RA 27778 (9 car.: PI. 25, 10, fig. 1), RA 27779 (9 car.: PI. 25, 10, fig. 2, PI. 25, 14, fig. 5), RA 27780 (9 car.: PI. 25, 10, fig. 3), RA 27781 (9 car.: PI. 25, 10, fig. 4), RA 27782 (9 car.: PI. 25, 10, figs. 5, 6, PI. 25, 16, figs. 1-4, PI. 25, 16, fig. 7), RA 27783 (9 car.: PI. 25, 10, fig. 7), RA 27784 (9 car.: PI. 25, 10, fig. 8), RA 27785 (o- car.: PI. 25, 12, fig. 1), RA 27786 (o* car.: PI. 25, 12, fig. 2, PI. 25, 14, fig. 6), RA 27787 (o* car.: PI. 25, 12, fig. 3), RA 27788 (cr car.: PI. 25, 12, fig. 4), RA 27789 (O' car.: PI. 25, 12, figs. 5, 6, PI. 25, 16, fig. 5, 6), RA 27790 (cr car.: PI. 25, 12, fig. 7), RA 27791 (o' car.: PI. 25, 12, fig. 8), RA 27792 (A-1 car.: PI. 25, 14, fig. 3), RA 27793 (A-1 car.: PI. 25, 14, figs 3, 4, 7), RA 27794 (O' car.: Text-fig. IF, G), RA 27795 (O' car.: Text-fig. 1, A-E), RA 27796 Explanation of Plate 25, 10 Fig.l, 9 car. rt. lat. (RA 27778, 530 pm long). Fig. 2, 9 car. It. lat. (RA 27779, 510 pm long). Fig. 3, a car. dors. (RA 27780, 530 pm long). Fig. 4, 9 car. vent. (RA 27781, 540 pm long). Fig. 5, 6, 9 car. (RA 27782, 480 pm long): fig. 5, disarticulated car. It. valve, int. lat.; fig. 6, disarticulated car. rt. valve, int. lat. Fig. 7, 9 car. ant. (RA 27783, 230 pm thick). Fig. 8, 9 car. post. (RA 27784, 220 pm thick). Scale A (200 pm; X97), figs. 1-8. Stereo-Atlas of Ostracod Shells 25, 1 1 Callistocythere pumila (3 of 8) (9 car.: Text-fig. 2). Specimens of RA 27778-RA 27781, RA 27783-RA 27788, RA 27790, RA 27791, RA 27794, RA 27795 collected from bottom sand of inner bay of Tsukumo Inlet, Noto Pen. Ishikawa Pref., Japan (depth=ca. 70 cm, 137°14.0'E, 37°18.8'N, on 23 June, 1987); RA 27782, RA 27789, RA 27792, RA 27793, RA 27796 from a pebble beach, Simodaira, Hukami-cho, Ushibuka City, Kumamoto Pref., Kyushu, Japan (depth=ca. 1 m, 130°06.6'E, 32°15.8'N, on 4 July, 1993). Diagnosis: Conspicuous sexual dimorphism in carapace ornamentation: Female with numerous deep fossae on whole carapace except for noticeable flat tubercle in antero-dorsal area, irregular undulated ridges in posterior half, two strong parallel marginal ridges in developed anteriorly; Male weakly ornamented in median area, two strong marginal ridges and few fossae in anterior, some fossae and a few marginal ridges in posterior areas. In the male copulatory organ, the copulatory duct (ductus ejaculatorius) coils several times, glans sticks out into the open centre of coiling. Two large curved clasping organs developed, the outer one being the larger. Thin subtriangular supporting lobe at distal end. Remarks: The morphology of this species occupies intermediate position between two genera, i.e. Leptocythere and Callistocythere. The male and female forms correspond to the former and the latter respectively. Because of the morphological differences between the two sexes, they were originally described as different species by Okubo (1975 and 1979, respectively), therefore Callistocythere laevis Okubo, 1979 is a junior synonym. This species inhabits shallow brackish-water environments of muddy sand substrates in inner bay or open lagoon near river mouth. Acknowledgements: I express my deep appreciation to Dr. Ian Boomer (University of Newcastle) for his critical reading of the manu- script. I also thank Dr. Takahiro Kamiya (Kanazawa University) for his united efforts in collecting samples. This study was partly supported by the Grant-in-Aid for Scientific Research (No. 09740636) of the Ministry of Education, Science and Culture, Government of Japan. Explanation of Plate 25, 12 Fig.l, cr car. rt. lat. (RA 27785, 520 pm long). Fig. 2, O' car. It. lat. (RA 27786, 520 pm long). Fig. 3, O' car. dors. (RA 27787, 540 pm long). Fig. 4, O’ car. vent. (RA 27788, 530 pm long). Fig. 5, 6, O' car. (RA 27789, 479 pm long): fig. 5, disarticulated car. It. valve, int. lat.; fig. 6, disarticulated car. rt. valve, int. lat. Fig. 7, O' car. ant. (RA 27790, 190 pm thick). Fig. 8, O' car. post. (RA 27791, 180 pm thick). Scale A (200 pm; X97), figs. 1-8. Stereo-Atlas of Ostracod Shells 25, 10 CuHistocylhere puniila (2 of 8) Stereo- Atlas of Ostracod Shells 25, 12 Callistocythere piimila (4 of 8) Stereo-Atlas of Ostracod Shells 25, 13 Callistocythere pumila (5 of 8) Text-fig. 1. Appendages of Callistocythere pumila, cr. A, antennule; B, antenna; C, mandible; D, maxilla; E, fifth limb; F, left male copulatory organ; G, right male copulatory organ. Figs. A-E from RA 27795; F, G from RA 27794. Scale bar indicates 100 pm. Explanation of Plate 25, 14 Figs. 1, 2, 9 car. (CA 2578, 490 pm long): fig. 1, car. rt. lat.; fig. 2, car. It. lat. Fig. 3, A-1 juvenile, rt. lat. (RA 27792, 420 pm long). Fig. 4, 7, A-1 juvenile (RA 27793, 410 pm long): fig. 4, It. lat.; fig. 7, carapace ornamentation in dorsal area. Fig. 5, 9 carapace ornamentation in dorsal area (RA 27779). Fig. 6, O' carapace ornamentation in dorsal area (RA 27786). Scale A (200 pm; X88), figs. 1, 2; scale B (200 pm; X97), figs. 3, 4; (60 pm; X323 ), figs. 5-7. Stereo-Atlas of Ostracod Shells 25, 15 Callistocythere pumila (7 of 8) Text-fig. 2. Distribution of marginal pore canals (RA 27796, 9)- Scale bar indicates 100 pm. Text- fig. 3. Geographical distribution of Callistocythere pumila Hanai, 1957. The localities from the Inland Sea are cited in Okubo (1975, 1979) and Yamane ( 1 998). Explanation of Plate 25, 16 Figs. 1^, 7, 9 car. (RA 27782): fig. 1, post, hinge element, LV; ant. hinge element, TV; fig. 3, ant. hinge element, RV; fig. 4, post, hinge element, RV, fig. 7, snap-structure on vent, area, RV Figs. 5, 6, O’ car. (RA 27789): fig. 5, adductor muscle scars, TV, fig. 6, adductor muscle scars, RV Scale A (30 pm; X650), figs. 1-7. Stereo-Atlas of Ostracod Shells 25, 14 Callistocythere piimila (6 of 8) Callistocythere pianila (8 of 8) Stereo-Atlas of Ostracod Shells 25, 16 Stereo-Atlas of Ostracod Shells 25 (4) 17-22 (1998) Dan^inula stevensoni (1 of 6) 595.337.13 (119.9) (493 : 161.003.51) : 551.312 ON DARWINULA STEVENSONI {BKAm & ROBERTSON) by Giampaolo Rossetti, David J. Hore and Koen Martens (Department of Environmental Sciences, University of Parma, Italy; School of Earth and Environmental Sciences, University of Greenwich, UK. and Royal Belgian Institute of Natural Sciences, Brussels, Belgium) Genus DARWINULA Brady & Robertson. 1885 1870 Polycheles gen. nov., G.S. Brady & D. Robertson, Ann. Mag. Nat. Hist., ser. 4, 6, 25 (junior homonym). 1872 Dai-winella nom. nov., G.S. Brady & D. Robertson, ibid., ser, 4, 9, 50 (junior homonym). 1885 Darwinula nom. nov,, G.S. Brady & D. Robertson, Quart. J. Geol. Soc. Lond., 41, p. 346, Type-species (by original designation): Polycheles stevensoni Brady & Robertson, 1870 Diagnosis: Elongated and mostly large (up to c. 0.8 mm) darwinulids, without internal teeth in the LV and without ventral keel on the RV. Hinge adont. Both R/L and L/R overlap possible. Dorsal margin evenly sloping, not rounded or straight over part of its length. Central muscle scar always situated towards the front in adult specimens. Large caudal brooding cavity externally visible. In frontal view, LV and RV almost symmetrical, not oblique. First segment on A1 with 2 dorsal setae; second segment with 3 ventral setae. A2 with 2 long setae and a spine on exopodite; first endopodal segment with two apical 5-claws. Postabdomen present. Furca in adults present or absent. Remarks: The present diagnosis is much more restricted than before (I.G. Sohn, Micropaleontology, 33,150-163, 1987), since the entire D. africana group has been moved into two new genera (G. Rossetti & K. Martens, in prep.). Only species of the stevensoni and serricaudata groups (sensu Martens et ai, in press) are retained in Darwinula s.s. Darwinula stevensoni Brady & Robertson, 1870 1870 (partim) Argilloecia (?) aurea sp. nov., G.S. Brady & D. Robertson, Ann. Mag. Nat. Hist., ser. 4, 6, 16, pi. 8, figs. 4, 5 1870 Polycheles stevensoni sp. nov., G.S. Brady & D. Robertson, ibid., ser. 4, 6, 25, pi. 7, figs. 17, pi. 10, fig. 13. 1872 Darwinella stevensoni (Brady & Robertson, 1870), G.S. Brady & D. Robertson, ibid., ser. 4, 9, 50. 1885 Darwinula stevensoni (Brady & Robertson, 1870), G.S. Brady & D. Robertson, Quart. J. Geol. Soc. Land., 41, 346 1895 Darwinula improvisa sp. nov., C.H. Turner, Minn. Geol. Nat. Hist. Survey, Zool. Ser, 2, 336, pi. 81, figs. 1-3, 13 (D. inopina in the caption of fig. 13). 1912 (partim) Darwinula aurea (Brady &. Robertson, 1870), G.W. Muller, in: F.E. Schultze (Ed.), Das Tierreich, 31, 240, figs. 63-65. 1968 Darwinula variabilis sp. nov., M.L. Tagliasacchi-Masala, Rend. Sem. Fac. Sc. Univ. Cagliari, 37, 624, pi. 3, 4. 1953 Darwinula variabilis sp. nov., D.R.Rome, Rev. Zool. Bot. Ajh, 41, 39, pi. 2, figs. 16-25. Explanation of Plate 25, 18 Fig. 1, 9 car., dors. (O.C. 1888, 735 pm long); fig. 2, 9 car., lat. (O.C. 1889, 715 pm long); fig. 3, 9 car., ventr. (O.C. 1890, 705 pm). Scale A (100 pm; X 126), figs. 1-3. Error of SEM magnification is c. 5%. Stereo-Atlas of Ostracod Shells 25, 19 Darwinula stevensoni (3 of 6) Lectotype: Type locality: Figured specimens: Diagnosis: Remarks: Distribution: Acknowledgements: Female carapace, Hancock Museum (Newcastle-upon-Tyne, UK.) no. 1.56.08 (designated by I.G. Sohn, op.cit, 1987). Somerton Broad, Norfolk, England (see Sohn, op. cit.); other original localities were reported by Brady & Robertson (op. cit., 1870). Royal Belgian Institute of Natural Sciences (Brussels, Belgium), Ostracod Collection, nos. O.C. 1829 (9: Text-fig. ID; Text-fig. 2D), O.C. 1830 (9: Text-figs. 1 A, F; Text-figs. 2B, C), O.C. 1831 (9: Text-fig. IE), O.C. 1832 (9: Text-fig. 2A), O.C. 1833 (9 RV and LV: PI. 25, 20, figs. 3, 4), O.C. 1834 (9: Text-figs. IB, C), O.C.1888 (9 car.: PL 25, 18, fig. 1), O.C. 1889 (9 car.: PI. 25, 18, fig. 2), O.C. 1890 (9 car.: PI. 25, 18, fig. 3), O.C. 1891 (9 RV and LV: PI. 25, 20, figs. 1, 2). All specimens collected by K. Martens on May 18, 1995 from Hollandersgatkreek, NW Belgium (lat. 51°15'47"N, long. 03°31 '58"E). Slightly saline lake, sandy bottom, animals collected at 1-1.5 m deep, along edge of littoral Typha-stand; water temperature = 12.8°C, pH=8.8, conductivity=3.44 mS/cm. Large-sized darwinulid. Valves pearly white, with smooth surface and widely spaced setae; RV overlapping LV on all sides except at the hinge. Seen ventrally, shell ovoid, posterior part rounded, forming a brood chamber, anterior part rather pointed; margin of the RV sinuous anteriorly and quite straight at the posterior 3/5; greatest width at about 2/3 of the length. In lateral view, shell elongate, greatest height in the posterior quarter; posterior margin more broadly rounded than the anterior one, the latter more pointed and slightly curved towards the ventral side; ventral margin almost straight, dorsal margin gently curved. Central muscle scar consisting of 9-12 spots arranged in a circular rosette. Hinge adont. Exopodite of antenna with unequal bristles a and b, the latter half as long as the former (Text-fig. 1 A). Second segment of mandibular palp bearing four terminal setae, three short (y, x and w) and one larger (z), the latter reaching beyond the tip of the next segment; third segment with two subterminal setae (a and b) and two terminal setae, one shorter (c) and the other (d) wider in the first half (“seta stevensoni”) (Text-fig. ID). Second segment of the maxillar endopodite with two setae (a and b) of equal length (Text-fig. IF). Furca absent in adult specimens. Abdomen ending as a conical, vermiform process (Text-fig. 2D). Male unknown (see below). The Darwinuloidea represent a prominent example of so-called ancient asexuals: bisexual populations are unknown since at least the end of the Cretaceous (c. 70 Ma), possibly since the Jurassic (c. 120 Ma) (I.G. Sohn, op. cit.), and as citations of some Mesozoic males are doubtful, possibly since the Permian (250 Ma) (I. Schoen et al., TREE, 11. 296-297, 1996). However, from recent faunas, males of D. stevensoni have been reported twice. In their original description of D. stevensoni, Brady & Robertson (op. cit., 1870) (see also G.S. Brady & A.M. Norman, Trans. R. Dub. S., N. S., 4, 122, pi. 10, figs. 1 1, 12; pi. 13, fig. 9, 1889) reported and even illustrated the carapace and the copulatory organ of a male of this species. Turner (op. cit., pi. 81, figs. 1, 2) also reported a male of D. improvisa (a synonym of D. stevensoni ) from North America, but only illustrated the Al and the T2 of this presumed male. Since then, researchers have intensively looked for males in this lineage but without any success. Morphology of both valves and soft parts of the species D. stevensoni has been redescribed extensively by G. Rossetti & K. Martens (Bull. Inst. R. Sci. Nat. Belg.. Biol., 66, 73-93, 1996). Morphological variability betw’een geographically and climatically distant populations is minimal or absent. Recent, fresh and brackish waters, ubiquitous. Cosmopolitan. This work has been supported by the E.U. Human Capital and Mobility Program (contract ERBCHRXCT/93/0253). We thank J. Cillis and C. Behen (Brussels) for the technical assistance with SEM-images and with line drawings, respectively. Soft parts illustrated here are reproduced with permission of the editor of the Bulletin van het Koninklijk Belgisch Instituut voor Natuurwetenschappen, Dr K. Wouters (Brussels). Explanation of Plate 25, 20 Fig. 1, 9 LV, int. lat. (O.C. 1891, 710 pm long); fig. 2, 9 RV, int. lat. (O.C. 1891, 730 pm long); fig. 3, 9 LV, detail of adductor muse. sc. (O.C. 1833); fig. 4, 9 RV, detail of adductor muse. sc. (O.C. 1833). Scale A (100 pm; X 126), figs. 1, 2; scale B (50 pm; X710), figs. 3, 4. Error of SEM magnification is c. 5%. Stereo- Atlas of Ostracod Shells 25, 21 Darwinula stevensoni (5 of 6) Text-fig. 1. Appendages of 9 D. stevensoni. A, A1 (O.C. 1830); B, A2 (O.C. 1834); C, Md-masticatory process (O.C. 1834); D, Md-palp, second and third segment (O.C. 1829); E, Mxl-palp (O.C. 1831); F, Mx2 (O.C. 1830). Scale bar = 49 pm for lA-F Stereo-Atlas of Ostracod Shells 25, 22 Darwinula stevensoni (6 of 6) Text-fig. 2. Appendages of 9 D. stevensoni. A, Mxl, branchial plate (O.C. 1832); B, T1 (O.C. 1830); C, T2 (O.C. 1830); D, Abd. (O.C. 1829). Scale bar = 49 pm for 1 A-D. Stereo-Atlas of Ostracod Shells 25 (5) 23-26 (1998) Beckerhealdia circumreptata (1 of 4) 595.337.22 (113.45) (430:162.050.11): 551.35 ON BECKERHEALDIA CIRCUMREPTATA BLUMENSTENGEL by Gerhard Becker (Senckenberg Museum, Frankfurt am Main, Germany) Genus BECKERHEALDIA Blumenstengel, 1 994 Type-species (by original designation): Beckerhealdia circumreptata Blumenstengel, 1994 Non-lobate, possible quasillitid genus. Outline elongate, subovate in lateral view, symmetrically biconvex in dorsal view. Extramarginal ridge runs along ventral, anterior and posterior margins terminating in anterodorsal, posterodorsal and posteroventral spines. Delicate (ad)marginal structures developed (margina). Beckerhealdia was initially thought to be closely related to Marginohealdia Blumenstengel, 1965. Originally assigned to the Family Healdiidae Harlton, 1933 (H. Blumenstengel, Freiberger ForschHft., C183, 42, 1965), Marginohealdia is now con- sidered to be a thlipsurid genus (F. Adamczak, pers. comm.)- Based on its overall carapace morphology Blumenstengel (op. cit.) suggested that Beckerhealdia had healdiid affinities; this idea is now rejected in favour of a possible quasillitid affinity. The overall healdiid carapace morphology suggested by Blumenstengel (op. cit.) is now rejected. Adventral structures are un- common amongst healdiids but are common in the quasillitids (marginal ridge) and bufinids (marginal tubercles); admarginal and extramarginal elevations are known in roponellids (F. Adamezak, Senck. leth., 57, 360, 368, 382, 1976). Posteriorly and anteriorly situated protuberances are well known in the Family Quasillitidae Coryell & Malkin, 1936. Timorhealdia Bless. 1987 was also considered to be closely related to Beckerhealdia (Blumenstengel, op. cit, 736, 1994) but this is also disputed. Although Beckerhealdia shows quasillitid affinities, its familial status must remain in doubt until its internal features (condition of the free margin, hinge structure) are known. In the quasillitid genus Beckmannillites Becker, 1988, an adventral structure (rim, bend) is present which is hook-like at the anterior cardinal angle; posterior spines are strong in both valves. This Givetian genus, however, shows a rather distinct pre-sulcal lobe. Similar patterns of ornamentation are known from Lower Devonian Quasillites (G. Becker, Palaeontographica A209, 146, 1989). The extensive extramarginal ridge and small carapace distinguish Beckerhealdia from these genera. Presently monospecific, known only from the Upper Devonian (late Fammenian) of Thuringia, Germany. Diagnosis: Remarks: Distribution: Explanation of Plate 25, 24 Figs. 1^, adult car. (holotype, Xe 18541, 830 pm long): fig. 1, rt. lat.; fig. 2, dors.; fig. 3, post.; fig. 4, anterior. Scale A (100 pm; X87), figs. 1, 2, 4; scale B ( 100 pm: X70), fig. 3. Stereo-Atlas of Ostracod Shells 25, 25 Beckerhealdia circumreptata Blumenstengel, 1994 Beckerhealdia circumreptata (3 of 4) 1994 Beckerhealdia circumreptata sp. nov. H. Blumenstengel, N. Jb. Geol Paldont. Mh. 1994, 733-740, fig. 1/1-8, figs. 21-6 1997 Beckerhealdia circumreptata Blumenstengel; H. Blumenstengel, Beitr. Geol. Thiiring., N.E, 4, 30, tab. 2, 3, fig. 2, pi. 1, fig. 1. 1998 Beckerhealdia circumreptata Blumenstengel; G. Becker, Senck. leth., 78, in press. Holotype: Type locality: Figured specimens: Diagnosis: Remarks: Distribution: A ckn owl edgemen ts : Forschungs-Institut Senckenberg, Frankfurt am Main, Germany (SMF) no Xe 18541; adult carapace (for full catalogue numbers see Becker, in press). Gositzfelsen East, Fischersdorf near Saalfeld, Thuringia, Germany, 50°36'N, 1 1°4'E; cephalopod limestones, lower part of the Upper Clymenia Formation (bed 15/1), Upper Devonian (Kalloclymenia Stage, do V, Fammenian). Forschungs-Institut Senckenberg, Frankfurt am Main, Germany (SMF) no Xe 18541, (holotype: car., PI. 25, 24, figs. 1^, PI. 25, 26, Fig. 2), Xe 18542 (LV, paraype, PI. 25, 26, Figs. 1, 3, 4). All of the figured specimens are from the type locatilty. Beckerhealdia species with distinct extramarginal ridge; spines strongly developed; posterior spines pointing backwards, anterodorsal spine pointing upwards; valve surface smooth; margina a narrow ridge. Beckerhealdia circumreptata is characterised by its strongly developed ridges and spines. The species belongs to Becker’s ‘Thuringian Ecotype’ (G. Beeker in: K. Bandel & G. Becker, Senck. leth., 56, 61, 1975), it is characteristie of low-energy environments and is considered to be nektobenthonic. However, the small volume of the carapace (relatively little carapaee convexity) seems indicative of a hemipelagie species, perhaps from basinal biotopes. The same phenomenon was also reported from another Thuringian genus, Kirkbyites Johnson, 1936 (Family Amphissitidae Knight, 1928, Superfamily Kirkbyacea Ulrich & Bassler, 1906) by Becker (J. Micropalaeont., 10, 29, 1991). Known from the Upper Devonian (late Fammenian) Dasberg Formation, cristata-tergocornuta ostracod Biozone (sensu Blumenstengel, op. cit. 29, 1997), Thiiringisches Schiefergebirge, Germany. Support of the laboratories of the Johann Wolfgang Goethe-Universitat and the Senckenberg Museum, Frankfurt is grate- fully acknowledged. This paper forms part of the D.F.G. Project “Faunenvergleich Rhenohercynikum/Saxothuringikum”, no. 50. Explanation of Plate 25, 26 Figs. 1, 3, 4. juv. LV (paratype, Xe 18542, 625 pm long): fig. 1, dors, obi.; fig. 3, dors.; fig. 4, dors. obi. Fig. 2, adult car., vent, (holotype, Xe 18541, 830 pm long). Scale A (100 pm; X 130), figs. 1, 3, 4; seale B (100 pm; X85), fig. 2. Stereo-Atlas of Ostracod Shells 25, 24 Beckerheaklia circwnreptata (2 of 4) Stereo-Atlas of Ostracod Shells 25, 26 Beckerhealdia circwnreptata (4 of 4) Stereo-Atlas of Ostracod Shells 25 (6) 27-30 (1998) Egorovellina operosa (1 of 4) 595.336.13 (113.312) (57 : 161.138.68) : 551.351 ON EGOROVELLINA OPEROSA KANYGIN by Roger E.L. Schallreuter (University of Hamburg, Hamburg, Germany) Ger\m EGOROVELLINA Kanygin, 1965 Type species (by original designation); Egorovellina operosa Kanygin, 1965 Diagnosis: A large egorovellid with only three vertical lobes in the anterior and central part of the valve. L4 lacking or only weakly developed. Remarks: Egorovellina differs from Egorovella Ivanova, 1950 mainly by the absence or weakly developed nature of L4. Egorovellina exhibits typical egorovellid dimorphism. This kind of sexual dimorphism was called “marginal dimorphism” by Kanygin (Paleont. Zh., 1965, 59, 1965). Schallreuter [Geologie, 15, 197, 1966) proposed the term “egorovellid dimorphism” to differentiate it from the dimorphism of marginal sculptures sensu Jaanusson {Bull. Geol. Inst. Univ. Uppsala, 37, 188, 1957), which often occurs in connection with antral dimorphism, when, for example, the marginal sculpture forms the inner antral fence in admarginal antral dimorphism. Egorovellid dimorphism is characterised by one dimorph having a broad marginal surface, in the anterior and ventral part of the valve, with ridges parallel to the free margin. The origin of this kind of dimorphism is still unknown. It resembles the kind of dimorphism found in the sigmoopsines, but in egorovellids the areas between the ridges do not appear to represent antra. Egorovellid dimorphism may be a kind of domiciliar dimorphism characterised by a broader domicilium in the anteroventral part of the valve. The ridges may represent “strengthening ridges”, as defined by Henningsmoen {Geol. Foren. Stockholm Fork., 86, 357, 1965). Occurrence: Middle Ordovician, NE Siberia. Explanation of Plate 25, 28 Figs. 1-5. 9 RV (256/37b, 4.00 mm long): fig. 1, ext. lat.; fig. 2, ext. vent.; fig. 3, ext ant.; fig. 4, detail of ant. lobe; fig. 5, detail of post, side of ant. lobe. Scale A (500 pm; X20), figs. 1, 2; scale B (500 pm; X 18), fig. 3; scale C (100 pm; X90), fig. 4; scale D (100 pm; X70), fig. 5. Stereo-Atlas of Ostracod Shells 25, 29 Egorovellina operosa (3 of 4) Egorovellina operosa Kanygin, 1965 1965 Egorovellina operosa sp. nov., A.V Kanygin, Paleont. Zh., 1965, 70, 71, pi. 8, figs. 5-7. 1967 Egorovellina operosa Kanygin; A.V Kanygin, Ostrakody ordovika gornoj sistemy Cherskogo, 85, 86, 126, 127, 138, 139, 151, table 2 (p. 118), pi. 14, figs. 6-8a. 1970 Egorovellina operosa Kanygin; Trudy Inst. geol. geofiz. Sibirsk. otd. Akad. nauk SSSR, (IGiG), 71, 162, pl.l, figs 1, 2. 1986-7 Egorovellina operosa Kanygin, 1967A; E.K. Kempf, Geol. Inst. Univ. Kdln Sonderverdff., 50, 328, 51, 415, 52, 451. 1990 Egorovellina operosa Kanygin; A.V Ivanova, Practical manual on microfauna of the USSR, 4, 70, 233, pi. 8, fig. 18. Holotype: Type locality: Figured specimens: Diagnosis: Remarks: Distribution: Acknowledgements: Institute of Geology and Geophysics, Siberian branch of the Russian Academy of Sciences, Novosibirsk (IGiG), no. 256/37a; tecnomorph, right valve. River Khonikukishan, Selennyakh Range, NE Siberia; Kalyshan Formation, middle Ordovician, (approximately 68°N, 138°E). Institute of Geology and Geophysics, Siberian branch of the Russian Academy of Sciences, Novosibirsk (IGiG), nos. 256/37a (tecnomorph, RV; PI. 25, 30, figs. 1-4) and 256/37b (9 RV: PI. 25, 28, figs. 1-5). Both specimens from the type locality. Up to 4.00 mm long. Weakly convex, anterior marginal surface in females steep to contact plane. No L4; non-lobate area behind L3 very broad. Lobes narrow; all nearly straight. E. curvicostata Kanygin, 1965 {op. cit.) is smaller (2.22 mm long) and more convex, with a less steep anterior marginal surface in females. Furthermore, the lobes are broader and the posterior non-lobate area is narrower, L3 is more bowed (1965, pi. 8, figs. 2-4', Kanygin, 1967 op. cit., pi. 14, figs. 3-5a). Kanygin (1965) considered the holotype as male but because of its smaller size (3.35 mm) compared to the female (4.00 mm) this is questionable. Middle Ordovician, Kalyshan Formation. Outcrops along the rivers Khonikukishan, Kalyshan and Oshibkovyj, Selennyakh Range, NE Siberia. I thank Dr. A.V Kanygin (Russian Academy of Sciences, Novosibirsk) for loan of the type material. Explanation of Plate 25, 30 Figs. 1-4. tecnomorph RV (holotype; 256/37a, 3.35 mm long): fig. 1, ext. lat.; fig. 2, ext. vent.; figs. 3,4, vent. obi. detail of ant. lobe (LI) showing details of ornament. Scale A (500 pm; X24), figs. 1, 2; scale B ( 100 pm; X80), fig. 3; scale C (25 pm; X290), fig. 4. Stereo-Atlas of Ostracod Shells 25 (7) 3 1-34 (1998) Bumire pilloides (1 of 4) 595.336.12 (1 13.31 1) (941:163.125.19); 551.351 ON BUMIRE PILLOIDES SCHALLREUTER gen. et sp. nov. by Roger E.L. Schallreuter (University of Hamburg, Germany) Genus BUMIRE gen. nov. Type-species: Bumire pilloides sp. nov. After the former Bureau of Mineral Resources. Geology and Geophysics, Canberra, A.C.T., Australia. Small, amplete to very slightly postplete. Valves of about equal size, lateral surface forms a large u-shaped lobal area (L1-L3) around a shallow, open, mid-dorsal sulcal area. L3 broader than LI; anterior flank of LI steeper to contact plane than posterior side of L3. Dorsal ends of lobes gently inflated but not protruding over the straight hinge-line; they are especially distinct in larvae (giving them an appearance like the genus Pilla). A tiny pre- adductorial node (L2) branches from LI into the sulcus, dividing the sulcus into SI and a slightly deeper S2. No adventral sculptures present, except for a narrow flange (ventrally) or ridge near free margin. Surface reticulate. Bumire resembles the pilline Eodominina Schallreuter with which it may occur. In Eodominina L2 is also tiny but LI and L3 are more distinctly developed and more spine-like at the dorsal margin. Furthermore, the sulcal area between the lobes is, relatively, much deeper (compare PI. 25, 32, fig. 4 and R.E.L. Schallreuter, Stereo- Atlas Ostracod Shells, 20, 124, fig. 3, 1993). Bumire is possibly a primitive pilline. However, it also resembles certain ‘leperditellocopes’; it is more like forms such as Ectoprimitioides Berdan (see New Mexico Bureau Mines Miner. Resources Mem., 44, 278, 1988) and is less like the typical non-sulcate forms such as Leperditella and Primitiella. Compared with Bumire, Ectoprimitioides is more elongate, less rounded and has a relatively longer hinge-line (see J.C. Kraft, Geol. Soc. Amer. Mem., 86, pi. 6, figs. 1-5, 1962) Lower Ordovician, Australia. Explanation of Plate 25, 32 Fig. 1. LV ext. lat. (paratype, 23063, 635 pm long). Fig. 2, LV ext. lat. (paratype, MB 0.234, 610 pm long). Fig. 3, RV ext. lat. (paratype, 23060, 535 pm long). Fig. 4, car. ext. dors, (holotype, 23058, 540 pm long). Scale A (100 pm; X85), figs. 1, 2; scale B (100 pm, X 100), figs. 3, 4. Derivation of name: Diagnosis: Remarks: Occurrence: Stereo-Atlas of Ostracod Shells 25, 33 Bumire pilloides (3 of 4) Bumire pilloides sp. nov. Holotype: Type locality: Derivation of the name: Diagnosis: Figured specimens: Distribution: Commonwealth Palaeontological Collection, Canberra, A.C.T., Australia (CPC), no. 23058, carapace. [Paratypes: CPC nos. 23059-23064; Museum fur Naturkunde, Berlin (MB) nos. 0.234-0.236]. Type section of the lower Ordovician Emanuel Formation at Prices Creek, northern Western Australia; lat. 18°35'48"N, long. 125°53'0"E; middle part of the Emanuel Formation (exact horizon not yet defined); possibly the lower part of the Arenig Series. With reference to the similarity of the two bulb-like lobes of some juveniles with the morphology of the some- times co-occurring pilline genus Eodominina. As for the genus, which is currently monotypic. Commonwealth Palaeontological Collection, Canberra, A.C.T., Australia (CPC), nos. 23058 (holotype, car.: PI. 25, 32, fig. 4), 23059 (paratype, RV: PI. 25, 34, fig. 1), 23060 (paratype, RV: PI. 25, 32, fig. 3), 23061 (paratype, car.: PI. 25, 34, fig. 4), 23062 (paratype, RV: PI. 25, 34, fig. 3) and 23063 (paratype, LV: PI. 25, 32, fig. 1 ). Museum fiir Naturkunde, Berlin (MB) nos. 0.234 (paratype, LV; PI. 25, 32, fig. 2) and 0.235 (paratype, RV: PI. 25, 34, fig. 2). Known with certainty only from the middle part of the Emanuel Formation, possibly lower Arenig, lower Ordovician, at the type locality. Explanation of Plate 25, 34 Fig. 1, LV ext. lat. (paratype, 23063, 635 pm long). Fig. 2, LV ext. lat. (paratype, 0.234, 610 pm long). Fig. 3, RV ext. lat. (paratype, 23060, 535 pm long). Fig. 4, car. ext. dors, (holotype, 23058, 540 pm long). Scale A (100 pm; X85), figs. 1, 2; scale B ( 100 pm ; X 100), figs. 3, 4. Stereo-Atlas of Ostracod Shells 25, 34 Binnire pilloides (4 of 4) Stereo-Atlas of Ostracod Shells 25 (8) 35-38 (1998) Muhuaella spinosa (1 of 4) 595.336.21 (113.51) (510:161.106.25): 551.35 ON MUHUAELLA SPINOSA OLEMPSKA gen. et sp. nov. by Ewa Olempska (Institute of Paleobiology, Warszawa, Poland) Genus MUHUAELLA gen. nov. Type-species: Muhuaella spinosa sp. nov. From Muhua, the type locality. Gender, feminine. Medium sized Cavellinidae. Right valve larger. Anterior end much higher than posterior. Broad and shallow S2. Distinct centroventral lobe, terminating in a posteriorly directed spine. Narrow adventral ridge entire in male carapaces, absent at posterior end in females. Adductor muscle-scar field consists of numerous small scars. Hinge structure confluent anteriorly and posteriorly with contact groove. Dimorphism of kloedenellid type, with distinct limen in females. Juvenile specimens have spine in anterodorsal corner of right valve. Valve surface smooth. No calcified inner lamella present. Right, holosolenic, larger valve and multiple muscle scars indicate the cavellinid affinities of this species. In lateral view Muhuaella is similar to Kloedenellitina Egorov (VG. Egorov, Ostracoda from the Frasnian stage of the Russian Platform. Part 1: Kloedenellidae. 1-175. Moscow, 1950), which was assigned to the Family Beyrichiopsidae Henningsmoen, 1953 by Sohn (in: R.C. Moore, Treatise on Invertebrate Paleontology, Q185, 1961). Muhuaella is distinguished from Kloedenellitina in having a strongly inflated centroventral lobe with a posteroventral spine and in having a different hinge structure confluent with the contact groove. Explanation of Plate 25, 36 Fig. 1. 9 car. It. lat. (holotype, O.XLV/101, 1200 gm long). Fig. 2. car. juv. dors. (O.XLV/102, 960 gm long). Fig. 3. 9 car. dors. (O.XLV/103, 1200 gm long). Fig. 4. cr car. It. lat. (O. XLV/104, 1080 gm long). Fig. 5. 9 car. vent. (O.XLV/105, 1090 gm long). Fig. 6. o* car. vent. (O.XLV/106, 1040 gm long). Scale (500 gm; X43), figs. 1-6. Derivation of name: Diagnosis: Remarks: Stereo- Atlas of Ostracod Shells 25, 37 Muhuaella spinosa (3 of 4) Muhuaella spinosa sp. nov. Holotype: Type locality: Derivation of the name: Diagnosis: Figured specimens: Distribution: Institute of Paleobiology, Polish Academy of Sciences, Warszawa (ZPAL) no. O.XLV/101: 9 carapace. Muhua, Guizhou province. South China, lat. 25°46'N, long. 106°23'E; Siphonodella crenulata Zone, Dawuba Formation, Tournaisian, early Carboniferous. From Latin spina - spine, referring to the posteroventral spine. As for the genus, which is currently monotypic. Institute of Paleobiology, Polish Academy of Sciences, Warszawa (ZPAL) nos. O.XLV/101 (holotype 9 car.: PI. 25, 36, fig. 1), O.XLV/102 (car. juv.: PI. 25, 36, fig. 2), O.XLV/103 (9 car.: PI. 25, 36, fig. 3), O.XLV/104 (O' car.: PI. 25, 36, fig. 4), O.XLV/105 (9 car.: PI. 25, 36, fig. 5), O.XLV/106 (o' car.: PI. 25, 36, fig.6), O.XLV/107 (9 RV: PI. 25, 38, fig. 1), O.XLV/108 (9 LV: PI. 25, 38, fig. 2), O.XLV/109 (o' RV: PI. 25, 38, fig. 3), O.XLV/110 (car. juv.: PI. 25, 38, fig. 4), O.XLV/111 (O' LV: PI. 25, 38, fig. 5). All of the figured specimens are from the type level and locality (Mu-42). Muhua, South China; early Carboniferous, Tournaisian. The material is silicified. Known only from the type locality, early Carboniferous, China. Explanation of Plate 25, 38 Fig. 1. 9 RV int. lat. (O.XLV/107, 1200 gm long). Fig. 2. 9 LV int. lat. (O.XLV/108, 1 120 gm long). Fig. 3. O' RV int. lat. (O.XLV/109, 1000 gm long). Fig. 4. car. juv. It. lat. (O.XLV/110, 920 gm long). Fig. 5. o* LV int. lat. (O.XLV/111, 960 gm long). Scale (500 gm; X43), figs. 1-5. Stereo-Atlas of Ostracod Shells 25, 36 Muhuaella spinosa (2 of 4) Stereo-Atlas of Ostracod Shells 25 (9) 39^2 (1998) Editella dawubaensis (1 of 4) 595.337.14 (1 13.51) (510:161.106.25): 551.35 ON EDITELLA DAWUBAENSIS OLEMPSKA gen. et sp. nov. by Ewa Olempska (Institute of Paleobiology, Warszawa, Poland) Genus EDITELLA gen. nov. Type-species: Editella dawubaensis sp. nov. Derivation of name: Diagnosis: Remarks'. Diminutive, from Editia Brayer, 1986, a closely related genus. Gender, feminine. Small Editiidae genus, with left valve slightly larger than right. Dorsal margin long; lobal area curves slightly above hinge line; ventral margin slightly sinuate at mid-length. Dorsal and ventral margins nearly parallel. Anterior margin rounded, posterior less so. Dorsal ridge extends from anterodorsal part of valve, subparallel to dorsal margin for 3/4 of total valve length then curves posteriorly. Submarginal ridge devel- oped near to free margin anteriorly, ventrally and posteriorly. Eye tubercle poorly developed. Duplicature broad anteriorly, narrow ventrally. Vestibulum shallow, only present anteriorly. Central muscle field comprises a group of five elongated scars arranged in a vertical row. Crenulated contact groove impressed in inner lamella of left valve. Hinge merodont. Valve surface reticulate. In contrast to Editia Brayer (J. Paleont., 26, 162-74, 1952), Adeditia Gramm & Egorov (Paleontol. Zh., 2, 50-60, 1986) and Proeditia Buschmina (in'. K.W. Simakov (ed.), XIV Pacific Science Congress. Field Excursion Guidebook for tour IX. Biostratigraphy and fauna of the Devonian-Carboniferous boundary deposits, suppl. 5, 5-70, Magadan, 1979), Editella lacks carinae on its surface. In its lateral valve outline and in possessing a dorsoposterior ridge Editella is similar to Editia albertensis Green (Bull. Res. Counc. Alberta, 11, 1-237, 1963), but differs in lacking anterior and anteroventral carinae. Explanation of Plate 25, 40 Fig. 1. car. rt. lat. (holotype, O.XLV/201, 600 pm long). Fig. 2. car. vent. obi. (O.XLV/202, 600 pm long). Fig. 3. car. dors. (O.XLV/203, 640 pm long). Fig. 4. car. vent. (O.XLV/204, 560 pm long). Scale A (200 pm; X 103), figs. IM. Stereo- Atlas of Ostracod Shells 25, 41 Editella dawubaensis (3 of 4) Editella dawubaensis sp. nov. Holotype: Type locality: Derivation of the name: Diagnosis: Figured specimens: Distribution: Institute of Paleobiology, Polish Academy of Sciences, Warszawa (ZPAL) no. O.XLV/201: carapace. Muhua, Guizhou province. South China; lat. 25°46'0"N, long. 106°23'0"E; Siphonodella crenulata Zone, Dawuba Formation, Tournaisian, early Carboniferous. From Dawuba Formation, the type horizon. As for the genus, which is currently monotypic. Institute of Paleobiology, Polish Academy of Sciences, Warszawa (ZPAL) nos. O.XLV/201 (holotype, car.: PI. 25, 40, fig. 1), O.XLV/202 (car.: PI. 25, 40, fig. 2), O.XLV/203 (car.: PI. 25, 40, fig. 3), O.XLV/204 (car.: PI. 25, 40, fig. 4), O.XLV/205 (LV: PI. 25, 42, fig. 1), O.XLV/206 (RV: PI. 25, 42, fig. 2), O.XLV/207 (RV: PI. 25, 42, fig. 3). All of the figured specimens are from the type level and locality (sample Mu-42). Muhua, South China; Tournaisian, early Carboniferous. The material is silicified. Known only from the type locality, early Carboniferous, China. Explanation of Plate 25, 42 Fig. 1. LV int. lat. (O.XLV/205, 560 pm long). Fig. 2. RV int. lat. (O.XLV/206, 680 pm long). Fig. 3. LV int. lat. (O.XLV/207, 720 pm long). Scale (200 pm; X103), figs. 1-3. Stereo-Atlas of Ostracod Shells 25 (10) 43-52 (1998) Schizocythere ikey^ai (1 of 10) 595.337.1 (119.9) (520 : 161.144.43 + 268.7 : 162.146.70 + 147.70 + 149.71) ; 551.351 ON SCHIZOCYTHERE IKEYAI TSVKAGOSm & BRIGGS sp. nov. by Akira Tsukagoshi and William M. Briggs, Jr. (The University Museum, The University of Toky’o, Japan, and Institute of Arctic and Alpine Research, University of Colorado, USA) Schizocythere ikeyai sp. nov. 1987 Schizocythere okhotsukensis Hanai; T. M. Cronin, & N. Ikeya, J. Micropalaeontol. , 6, 86, pi. 2, fig. 14. 1990 Schizocythere sp. A; E. M. Brouwers, U. S. Geol. Surv. Prof. Pap., 1510, 18, pi, 1, fig. 14, pi. 5, figs. 10, 11. 1992 Schizocythere sp.; N. Ikeya, B.-C. Zhou, & J. Sakamoto, Centenary of Japanese Micropaleontology, 11, figs. 14, 15. 1996 Schizocythere sp, 1; H. Ozawa, Sci. Rep. Kanazawa Univ., 41, pi. 8, fig. 10. The University Museum, The University of Tokyo (UMUT) no. RA 27688; O’ carapace with soft parts (Length=0.66 mm. Height=0.40 mm). [Paratypes: nos. RA 27689-27698, 27773-27777]. Nakase, Akkeshi Bay, eastern Hokkaido, Japan (ca. 43°0'N, 144°48'E), bottom sediment, ca. 10 m water depth. The University Museum, The University of Tokyo (UMUT) nos. RA 27688 (o’ car. with soft parts: PI. 25, 44, Figs. 1, 2, Text-fig. 1 A, B, E, Text-fig. 2 A-D, F, G), RA 27689 (O’ car.: PI. 25, 44, Figs. 3, 4), RA 27690 (9 car.: PI. 25, 46, Figs. 1,2. PI. 25, 50, Figs. 7, 8), RA 27691 (9 car.: PI, 25, 46, Fig. 3), RA 27692 (9 car.: PI. 25, 46, Fig. 4), RA 27693 (9 RV: PI. 25, 48, Fig. 1, PI. 25, 50, Figs. 1, 2, 5), RA 27694 (9 LV: PL 25, 48, Fig. 2, PI. 25, 50, Figs. 3, 4, 6, 9), RA 27695 (O’ car.: PI. 25, 48, Fig. 3), RA 27696 (A-1 RV: PI. 25, 48, Fig. 4), RA 27697 (A-1 LV: PI. 25, 48, Fig. 5), RA 27698 (9 car. with soft parts: Text-fig. 1 C, D, Text-fig. 2 E), RA 27773 (9 RV: PI. 25, 51, Figs. 1, 6) and RA 27777 (A-3 RV: PI. 25, 51, Fig. 5) from Beaufort Sea, 70°34.9'N, 145°36.0'W, ca 37 m water depth, RA 27774 (A-1 LV: PI. 25, 51, Figs. 2, 7) from Beaufort Sea, 70°55.5'N, 146°30.0'W, ca 109 m water depth, RA 27775 (A-1 RV: PI. 25, 51, Fig. 3) from Beaufort Sea, 70°34.4'N, 146°33.0'W, ca 36 m water depth, RA 27776 (A-3 LV: PI. 25, 51, Fig. 4) from Beaufort Sea, 71°10.9'N, 148°32.0'E, ca 37 m water depth. All specimens from the type locality unless otherwise stated. Holotype: Type locality: Figured specimens: Explanation of Plate 25, 44 Fig.l, O’ RV, ext. lat. (Holotype: RA 27688). Fig. 2, O’ LV, ext. lat. (Holotype: RA 27688). Fig. 3, O’ RV, ext. lat. a smooth ornamented form i 1 (Paratype: RA 27689). Fig. 4, O’ LV, ext. lat. a smooth ornamented form (Paratype: RA 37689). Figs. 1 and 2 are SEM non-coated specimens. I All specimens were collected from the type locality. j i Scale A (200 pm; X89), figs. 1, 2; scale B (200 pm; X89), figs 3, 4. ; i ?'*?*" Stereo-Atlas of Ostracod Shells 25, 45 Schizocythere ikeyai (3 of 10) Derivation of name: Diagnosis: Remarks: Acknowledgements: In honour of Prof Noriyuki Ikeya, Shizuoka University. A species of Schizocythere with relatively rounded lateral outline, distinct marginal ridges except for dorsal area and an inconspicuous central ridge on well calcified and thick carapace. Numbers of funnel-type and sieve-type pores are 13 and about 66, respectively (the typical distribution pattern of lateral pore systems is shown in Text-fig. 3). In male copulatory organs, outer lobes (supporting lobe) are very thin ventrally, thick distally and dorsally. Distal end of outer lobe stout, curved and tapered to a point in left hemipenis, smaller in right. Ductus ejaculatorius almost straight, tip does not extend beyond edge of hemipenis. Wide variations in carapace ornamentation are shown (pis. 25, 44 and 25, 51 ). For example, the Beaufort Sea specimens (PI. 25, 51, Fig. 1), particularly the adults, are more costate than either of the two Hokkaido forms (PI. 25, 44, Figs.l, 2 and 3, 4), as indicated by the well-developed median lateral ridge (connecting with anterior and posterior marginal ridges), which is absent from the Hokkaido forms. The smooth Hokkaido form (PI. 25, 44, Figs 3, 4) has a subdued reticulum with broad mural elements, with the muri in the anteroventral and ventral sectors of the lateral field widened laterally at the expense of some of the sola. The muri of the reticulum of the ‘more reticulate’ Hokkaido form (PI. 25, 44, Figs. 1, 2), such as the holotype, are more pronounced less extended laterally, while the sola have secondary reticulation. However, the shape of male copulatory organ (Text-fig. 2 F, G) in the Hokkaido specimens, and distributional pattern of lateral pore system (Text-fig. 3) in Hokkaido and Beaufort Sea specimens are remarkably stable. The distribution pattern of lateral pore system was compared with S. kishinouyei and S. okhotskensis which are closely related species and clear differences were shown by Tsukagoshi & Kamiya (Biol. Jour. Linn. Soc. 57, 350, Fig 4, 1996; where the present species was figured as Schizocythere sp. 1 ). In Japan, this species ranges from the Late Pliocene to Recent. Following the Pleistocene, it became widely distributed in the North Pacific and western Arctic Oceans (Text-fig. 4). The authors express their deep appreciation to Prof N. Ikeya (the Shizuoka University) for access to his extensive collections; to Mr. Y. Takashima (the Hokkaido University) for his kind help in collecting samples at the type locality; to Drs. E. Reimnitz and P. Barnes (U. S. Geological Survey) and B. Pelletier, G. Vilks and F. Wagner (Geological Survey of Canada) for collecting and permission to use the samples from the Beaufort Sea. Discussions with Dr. Q. Siddiqui (Saint Mary’s University, Halifax) were helpful. The staff members of the Akkeshi Marine Biological Station provided various amenities to the first author. This study was supported in part by the Grant-in-Aid for Scientific Research (Nos. 04740443 and 09740636) of the Ministry of Education, Science and Culture, Government of Japan (to the first author); and in part by grants from the Geological Survey of Canada, the National Science Foundation (DPP-81-06802) and the U. S. Geological Survey (to the second author). Explanation of Plate 25, 46 Fig 1, 9 RV, ext. lat. (Paratype: RA 27690). Fig. 2, 9 LV, ext. lat. (Paratype: RA 27690). Fig. 3, 9 ext. ant. (Paratype: RA 27691). Fig. 4, 9 ext. dor. (Paratype RA 27692). All specimens were collected from the type locality. Scale A (200 pm; X89), figs 1^. Stereo-Atlas of Ostracod Shells 25, 44 Schizocythere ikeycii (2 of 10) Schizocythere ikeyai (4 of 10) Stereo-Atlas of Ostracod Shells 25, 46 Stereo-Atlas of Ostraeod Shells 25, 47 Schizocythere ikeyai (5 of 10) Text-fig. 1 . Appendages of S. ikeyai. A, antennule. B, antenna. C, mandible. D, maxilla. E, int. view of RV by transmitted light. Figs. A, B, E from RA 27688 (o', Holotype), Figs. C, D from RA 27698 (9, Paratype). Scale bar 50 pm for A-D, 200 pm for E. Explanation of Plate 25, 48 Fig. 1, O’ RV, int. lat. (Paratype; RA 27693). Fig. 2, O’ LV, int. lat. (Paratype; RA 27694). Fig. 3, O’ ext. vent. (Paratype; RA 27695). Fig. 4, A-1 RV, ext. lat. (RA 27696). Fig. 5, A-1 LV, ext. lat. (RA 27697). All specimens were collected from the type locality. Scale A (200 mm; X89), figs 1-5. Stereo-Atlas of Ostraeod Shells 25, 49 Schizocythere ikeyai (7 of 10) Text-fig. 2. Appendages of S. ikeyai. A, brush-shaped organ. B, first thoracic leg. C, second thoracic leg. D, third thoracic leg. E, female genitalia and caudal rami. F, left male copulatory organ. G, distal end of right male copulatory organ. Figs A-D, F, G from RA 27688 (O’, Flolotype), E from RA 27698 (9, Paratype). Scale bar indicates 50 pm for A-G. Explanation of Plate 25, 50 Fig 1, Anterior element of hingement on RV (Paratype; RA 27693). Fig. 2, Posterior element of hingement on RV (Paratype; RA 27693). Fig. 3, Anterior element of hingement on LV (Paratype, RA 27694). Fig. 4, Posterior element of hingement on LV (Paratype, RA 27694). Fig. 5, Central muscle scars on RV (Paratype; RA 27693). Fig. 6, Central muscle scars on LV (Paratype; RA 27694). Fig. 7, Funnel-type pore system (Paratype; RA 27690). Fig. 8, Sieve-type pore system (Paratype; RA 27690). Fig. 9, Internal view of sieve-type pore system (Paratype; RA 27694). All specimens were collected from the type locality. Scale A (ca. 30 pm; X330) figs. 1^, (ca. 20 pm; X500) figs. 5, 6; (ca. 6 pm; X 1600) figs. 7-9. Stereo-Atlas of Ostracod Shells 25, 5 1 Schizocylhere ikeycii (9 of 10) Stereo-Atlas of Ostracod Shells 25, 52 Schizocythere ikevai ( 10 of 10) Text-fig. 3. Typical distributional pattern of lateral pore systems in Schizocythere ikeyai sp. nov. Black dots and asterisks indicate sieve -type and funnel-type pore systems, respectively. - -i- Text-fig. 4. Geographical and geological distribution of Schizocythere ikeyai sp. nov. The occurrences from Cook Inlet, Kodiak Shelf, Norton Sound. Pribilof Islands and Chukchi Sea indicate broad localities according to Brouwers [op. cit., 1990). Black solid circles and triangles indicate Recent and Late Pliocene to Pleistocene occurrences, respectively. Explanation of Plate 25, 51 Fig. 1, 9 RV, ext. lat. (Paratype: RA 27773). Fig. 2., A-1 LV, ext. lat. (Paratype: RA 27774). Fig. 3, A-1 RV, ext. lat. (Paratype: R.\ 27775). Fig. 4. A-3 RV, ext. lat. (Paratype: RA 27776). Fig. 5, A-3 LV, ext. lat. (Paratype: RA 27777). Fig. 6, an example of well-preserved carapace surface (Paratype: RA 27773). Fig. 7, an example of poorly-preserved carapace surface (Paratype: RA 27774). All specimens were collected from Beaufort Sea of Alaska. Scale bar indicates 200 pm for 1-5 and ca. 30 pm for 6, 7. Stereo-Atlas of Ostracod Shells 25 ( 1 1 ) 53-56 (1998) Vania perdita (1 of 4) 595.337.14 (113.331) (510:161.106.25): 551.35 ON VANIA PERDITA KRUTA AND SIVETER gen. et sp. nov. by Miroslav Kruta and David J. Siveter (Akademie Ved CR, Geol. Ustav, Prague, Czech Republic; University of Leicester, England) Genus VANIA gen. nov. Type-species; Vania perdita sp. nov. In honour of M. Vafia, Laboratory of GLU AV ER, Prague. Gender feminine. Valves reticulate, elongate, weakly amplete. Dorsal margin almost straight; lobal area reaches over ventral valve margin in lateral view. Cardinal angles obtuse, indistinct. Posterior lobe broad, has inflated connec- tion to broader anterior lobal area; area behind posterior lobe is much less elevated. Adductorial sulcus well developed, occurs just behind mid-length, widens dorsally. Dimorphism unknown. The taxonomic position of this genus is uncertain, particularly as details of its internal morphology are unknown. In valve shape and general lobal and sulcal morphology its appearance is like forms assigned to the cytherellid kloedenellaceans (e.g. see Borovitchella Gramm, Lethaia, 18, 49, 1985), but it is distinguished particularly by its more posterior sited adductorial sulcus and straighter dorsal margin. Bairdiocypris vafra Wang (Acta micropal. sin., 14, 463, 1997), from the Devonian of S. China, is possibly congeneric. Derivation of name: Diagnosis: Remarks: Explanation of Plate 25, 54 Fig. 1. RV ext. lat., having badly worn shell (paratype, L 20478, 0.83 mm long). Fig. 2. RV ext. lat. (paratype, L 28812, 0.96 mm long). Scale A (250 pm; X 1 13), fig. 1; scale B (250 pm; X95), fig. 2. Stereo-Atlas of Ostracod Shells 25, 55 Vania perdita (3 of 4) Vania perdita sp. nov. 1988 Vania perdita Kruta g. et s. n. (MS); A. Pribyl, Shot: geol. ved., Paleont., 29, 130 (nom. mtd.). 1990 Vania perdita Kruta & Siveter 1989; M. Kruta in R. Whatley & C. Maybury (eds), Ostracoda and Global Events, 234, pl.l, fig. 5 (nom. mid. ). Chapman & Hall, London. 1993a Vania perdita Kruta & Siveter; W. Hansch, N. Jb. Geol. Paldont. Abh., 187, 185, fig. 1. (nom. nud.). 1993b Vania perdita Kruta & Siveter; Hansch, in McKenzie, K.G. & Jones, P.J. (eds) Ostracoda in the Earth and Life Sciences, 30, fig 5 (2) (nom. mid. ). Balkema, Rotterdam. Holotype: National Museum, Prague, nos. L 28811; a large RV [Paratypes: National Museum, Prague, nos. L 20478, a large RV; L 20480, a juvenile RV; L 28812, a large RV] Bed 9, Pfidoli Series, Upper Silurian, at Klonk, near Suchomasty, Bohemia, Czech Republic; lat. 49°52'E, long. 14°6'N. This is the international stratotype section of the Silurian-Devonian Boundary. Latin ‘perditus ', lost; alluding to the uncertain taxonomic position of this species. As for the genus whieh is currently monospecific. National Museum, Prague, nos. L 20478, (paratype, RV: PI. 25, 54, fig. 1), L 20480 (juvenile RV; PI. 25, 56, fig. 3), L 28811 (holotype, RV: PI. 25, 54, figs. 1, 2), L 28812 (paratype, RV: PI. 25, 54, fig. 2). All from the type level and locality. This species was first recognised in an unpublished thesis (M. Kruta, Beyrichiida (Ostracoda) ze svrchniho siluru stratotypu Klonk [Barrandian], Charles University, Prague) and has featured as a nomen nudem in several papers. All specimens are preserved on limestone slabs. We have 28 valves, including probable adults and probably six instars (length; 0.93 mm to 0.42 mm). Occurs throughout the Pfidoli Series, Upper Silurian, Bohemia, Czech Republic (see Hansch, 1993a, 1993b). Explanation of Plate 25, 56 Figs. 1, 2, technomorphic RV (holotype, L 28811, 0.80 mm long): fig. 1. ext. lat.; fig. 2, ext. post. Fig. 3, juv. RV, ext. lat. (paratype, L 20480, 0.51 mm long). Scale A (250 pm; X 1 10), figs. 1, 2; scale B ( 100 pm; X 100), fig. 3. Type locality: Derivation of the name: Diagnosis: Figured specimens: Remarks: Distribution: Stereo-Atlas of Ostracod Shells 25, 54 Vania perdUa (2 of 4) Stereo-Atlas of Ostracod Shells 25 (12) 57 (1998) Swainocythere minusculum (1 of 1 ) ON SWAINOCYTHERE MINUSCULUM (RUGGIERI) Errata by Ian Boomer & Eugene Kempf (Department of Geography, University of Newcastle, Newcastle, UK. and Geological Instutute, University of Koln, Koln, Germany) Dickson {A Stereo-Atlas of Ostracod Shells, 23, 1^, 1996) illustrated a species which she assigned to Swainocythere miniscula Ruggieri. Unfortunately a number of nomenclatoral errors are now apparent in that work. Ruggieri (Soc. Geol. Ital. Boll., 94, 1977) first described the species in 1977, not 1975 as reported in Dickson’s synonymy, nor 1976 as reported in her title. Ruggieri {ibid.) initially referred this new species to the genus Cytheropteron? thus Dickson created a new combination and should have placed the original author in parentheses. Furthermore, the species name was mis-spelt in the Dickson paper, reporting it as minisculum, not minusculum. The correct citation for this species should read Swainocythere minusculum (Ruggieri, 1977). Since the paper by Dickson was published the specimens have been assigned new registration numbers in the collections of the British Geological Survey at Keyworth, Nottinghamshire, U.K. The cited specimen and the new numbers are given below, we wish to thank Dr Ian Wilkinson (BGS) for this information. Illustration Cited numbers New Registration Numbers PI. 23, 2, Fig. 1 89/15-1.1-1 MPK10776 PI. 23, 2, Figs. 4, 5 89/15-1.1-2 MPK 10777 PI. 23, 2, Fig. 3 89/15-1.1-3 MPK10778 PI. 23,4, Figs. 1,3,4 89/15-1.1-4 MPK10779 PI. 23, 4, Fig. 2 89/15-2.85-5 MPK10780 PI. 23, 4, Fig. 5 89/15-5.85-6 MPK10781 Stereo-Atlas of Ostracod Shells 25 (13) 58-59 (1998) Index, Volume 25, 1998 ( \ of 2) General Index Becker, G., On Beckerhealdia circumreptata Blumenstengel; 23-26 Beckerhealdia circumreptata Blumenstengel; 23-26 Boomer, I. & Kempf, E. On Swainocythere minusculum (Ruggieri) Errata; 61 Briggs. W.M. Jr., & Tsukagoshi, A., On Schizocythere ikeyai Tsukagoshi & Briggs sp. nov.; 43-52 Bumire pilloides Schallreuter; 3 1-34 Callistocythere pumila Hanai; 9-16 circumreptata, Beckerhealdia', 23-26 Darwinula stevensoni Brady & Robertson; 17-22 dawubaensis, Editella', 41-44 Editella da-wubaensis Olempska gen. et sp. nov.; 41^4 Egorovellina operosa Kanygin; 27-30 Fuscinidlina (Fuscinullina) pectinata Kanygin; 5-8 Ginginella maudriseensis Majoran sp. nov.; 1—4 Home, D.J, Rossetti, G. & Martens, K., On Darwinula stevensoni Brady & Robertson; 17-22 ikeyai, Schizocythere', 43-52 Kempf, E. & Boomer, I. On Swainocythere minusculum (Ruggieri) Errata; 61 Kruta, M. & Siveter, D.J., On Vania perdita Kruta & Siveter gen. et sp. nov.; 53-56 Majoran, S., On Ginginella maudriseensis Majoran sp. nov.; 1^ Martens, K., Rossetti, G. & Home, D.J., On Darwinula stevensoni Brady & Robertson; 17-22 maudriseensis, Ginginella', 1-M minuscula, Swainocythere', 61 Muhuaella spinosa Olempska gen. et sp. nov.; 35-38 Olempska, E., On Editella dawubaensis Olempska gen. et sp. nov.; 41^4 Olempska, E., On Muhuaella spinosa Olempska gen. et sp. nov.; 35-38 operosa, Egorovellina', 27-30 pectinata, Fuscinullina (Fuscinullina)', 5-8 perdita, Vania', 53-56 pilloides, Bumire', 31-34 pumila, Callistocythere', 9-16 Rossetti, G., Home, D.J. & Martens, K., On Darwinula stevensoni Brady & Robertson; 17-22 Schallreuter, R.E.L., On Bumire pilloides Schallreuter; 31-34 Schallreuter, R.E.L., On Egorovellina operosa Kanygin; 27-30 Schallreuter, R.E.L., On Fuscinullina (Fuscinullina) pectinata Kanygin; 5-8 Schizocythere ifeya/ Tsukagoshi & Briggs sp. nov.; 43-52 Siveter, D.J. & Kmta, M., On Klonxotis idoneus Kruta & Siveter gen. et sp. nov.; 13-16 Siveter, D.J. & Kmta, M., On Vania perdita Kmta & Siveter gen. et sp. nov.; 9-12 spinosa, Muhuaella', 35-38 stevensoni, Darwinula', 17-22 Swainocythere minusculum (Ruggieri); 61 Tsukagoshi, A. On Callistocythere pumila Hanai; 9-16 Tsukagoshi, A. & Briggs, W.M. Jr., On Schizocythere ikeyai Tsukagoshi & Briggs sp. nov.; 43-52 Vania perdita Kmta & Siveter gen. et sp. nov.; 53-56 Stereo- Atlas of Ostracod Shells 24 (7) 41-42 (1998) Index, Volume 25, 1998 (2 of 2) Index; Geological Horizon See 1 (1) 5-22 (1973) for explanation of the Schedules in the Universal Decimal Classification (119.9) (116.333.3) (113.51) (113.45) (1 13.333) (113.312) (113.311) Recent: Callistocythere pumila; 9-16 Darwinula stevensoni; 17-22 Schizocythere ikeyai; 43-52 Maastrichtian: Ginginella maudriseensis; 1—4 Lower Carboniferous: Editella dawubaensis; 41^4 Muhuaella spinosa] 35-38 Upper Devonian: Beckerhealdia circumreptata\ 23-26 Upper Silurian: Vania perdita; 53-56 Middle Ordovician: Egorovellina operosa; 27-30 Lower Ordovician: FuscinuUina (Fuscinullina) pectinata\ 5-8 Bumire pilloides; 3 1-34 Index; Geographical Location See 1 (1) 5-22 (1973) for explanation of the Schedules in the Universal Decimal Classification (520) Japan: Callistocythere pumila', 9-16 Schizocythere ikeyai', 43-52 (510) China: Editella dawubaensis', 41-44 Muhuaella spinosa', 35-38 Vania perdita', 53-56 (493) Belgium: Darwinula stevensoni', 17-22 (430) Germany: Beckerhealdia circumreptata', 23-26 (269.4) Atlantic sector of Antarctic Ocean: Ginginella maudriseensis', \-4 (268.7) Arctic Ocean: Schizocythere ikeyai', 43-52 (57) Asiatic Former US. S.R.: Egorovellina operosa; 27-30 Fuscinullina (Fuscinullina) pectinata', 5-8 (941) Western Australia: Bumire pilloides', 31-34 Stereo- Atlas of Ostracod Shells: Vol. 24, Parts 1 and 2 CONTENTS 24(1) 1-4 24(2) 5-12 24(3) 13-16 24 (4) 17-24 24(5) 26-33 24(6) 34^0 24(7) 41-42 On Cytheroptewn crassiscutum Ayress sp. nov.; by M. Ayress. On Cythere hanaii Tsukagoshi & Ikeya; by A. Tsukagoshi. On Eodominina ema Schallreuter sp. nov.; by R.E.L Schallreuter. On Severobolbina elliptica (Steusloff); by R.E.L. Schallreuter. On Scrobisylthis reticulatus (Sarv); by R.E.L. Schallreuter. On Kirkbyrhiza retifera (Roth); by G. Becker, L.E. Petersen & R.F. Lundin. Index for volume 24 (1998 for 1997) Prepaid annual subscription (valid for Volume 25, 1998) Individual subscription £30.00 or US$60.00 for Volume 24 (post free) Institutional subscription £95.00 or US$160.00 for Volume 24 (post free) Back volumes available as individual parts or as complete runs. 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