I REPRINTED JANUARY 1991 I A Stereo -Atlas of Ostracod Shells edited by R. H. Bate, J. W. Neale, David J. Siveter and P. C. Sylvester -Bradley J.i 3 S ¥■ j, T** tssHH r< * w * Jri _ _ „ *2jk | A ? . * I S ' ' V I#* ’ * V5 * w S|f #■ i < J iiiL ■tic- Volume 4, Part 2; 28th December 1977 ( 4 cfl| Published by The British Micropalaeontological Society in association" with Robertson Research International Ltd., Llandudno, Wales ■ I . Editors Dr. R.H. Bate, Department of Palaeontology, British Museum (Natural History), Cromwell Road, London SW7 5BD. Dr. J.W. Neale, Department of Geology, The University, Hull HU6 7RH. Dr. David J. Siveter, Department of Geology, The University, Leicester LEI 7RH. Professor P.C. Sylvester-Bradley, Department of Geology, The University, Leicester LEI 7RH. Editorial Board Dr. Richard H. Benson, Smithsonian Institution, Washington, D.C., 20560. U.S.A. Dr. Alwine Bertels, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina. Dr. K. Ishizaki, Institute of Geology and Paleontology, Tohoku University, Sendai, Japan. Dr. C.W. Haskins, Robertson Research International Limited, ‘Ty’n-y-Coed’, Llanrhos, Llandudno, N. Wales, LL30 ISA. Dr. P.J. Jones, Bureau of Mineral Resources, P.O. Box 378, Canberra City, A.C.T 2601 , Australia. Prof. Dr. E. Kempf, Geologisches Institut der Universitat Koln, Ziilpicher Strasse 49, D-5 Koln 1, German Federal Republic. Dr. H.J. Oertli, S.N.P.A., Centre de Recherches, 64001 Pau, France. Prof. G. Ruggieri, Instituto e Museo di Geologia dell’Universita di Palermo, Corso Tukory, 131. 90134 Palermo, Italy. Mr. P.F. Sherrington, Petro-Canada, P.O. Box 2844, Calgary, Alberta T2P 2M7, Canada. Instructions to Authors Contributions illustrated by scanning electron micrographs of Ostracoda in stereo-pairs are invited. Full instructions may be obtained on request from any one of the Editors or Editorial Board. 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 the Editors. Acknowledgments This Volume of the Stereo-Atlas has been aided by generous financial support from Robertson Research International Limited. Stereo -viewing for users of the Atlas In order to obtain maximum information and benefit from the use of the Stereo-Atlas it is essential that the user view the micrographs stereoscopically . Small pocket-sized stereo-viewers are most suitable for this purpose. Two suppliers are: C.F. Casella & Co. Ltd., Regent House, Britannia Walk, London N1 7ND, and Air Photo Supply Corpn., 1 58 South Station, Yonkers, New York 10705. U.S.A. Plates printed by The Broadwater Press Ltd., Welwyn Garden City, Herts., England. t — y . Stereo-Atlas of Ostracod Shells 4 (13) 79 - 86 (1977) Heterocyprideis macrotuberculata (1 of 8) 595.337.14 (11 9)(26 1 .26: 161.000.57: 551.351 + 552.51 ON HETEROCYPRIDEIS MACROTUBERCULATA MASSON & WHATLEY sp. nov. by Douglas Masson and Robin Whatley (University College of Wales, Aberystwyth) Holotype: Type locality: Derivation of name: Heterocyprideis macrotuberculata sp. nov. Brit. Mus. (Nat. Hist.) no. OS 7593, 9 RV. [Paratypes: nos. OS 7594 - OS 7598] . British Petroleum engineering borehole. Forties Field, North Sea; lat. 57° 45'N, long. 0° 55'E. Quaternary, marine, muddy silt. Found from 0 - 45m below sediment surface. Alluding to the large and prominent subcentral tubercle. Figured specimens: Brit. Mus. (Nat. Hist.) nos. OS 7593 (holotype, 9 RV: PI. 4, 80, fig. 1 ; PI. 4, 84, figs. 1 , 2; PI. 4, 86, fig. 3), OS 7594 (9 LV: PI. 4, 84, fig. 3), OS 7595 (<5 LV: PI. 4, 82 fig. 1), OS 7596 (6 RV: PI. 4, 80 fig. 2), OS 7598 (9 RV: PI. 4', 82, fig. 2; PI. 4, 86, figs. 1, 2). All the figured specimens are from sample 3 (13), 22m below sediment surface, Forties Field, North Sea. Explanation of Plate 4, 80 Fig. 1 , 9 RV, ext. lat. (holotype, OS 7593, 900 pm long); fig. 2, 6 RV, ext. lat. (OS 7596, 880 pm long). Scale A (200 pm\ x 80), figs. 1, 2. mT H- F ■F— 1-4- ■I »~F 4" Stereo-Atlas of Ostracod Shells 4,81 Heterocyprideis macrotuberculata (3 of 8) Diagnosis: Strongly and irregularly reticulate with subcentral tubercle strong, prominent and reticulate. Free margin surrounded by four ridges between which are puncta. Posterior loop subperipheral. Remarks: All three species of the genus are confined to the Northern Atlantic and Arctic. The present species differs radically from H. sorbyana (Jones) (Palaeontogr. Soc. [Monogr.J 1856), the latter lacking subcentral tubercle and peripheral ridges. H. fascis (Brady & Norman, 1889) (Scient. Trans. R. Dubl. Soc. (2) 4), is more similar but is smaller, less strongly ornamented and has a more peripherally situated posterior loop. H. macrotuberculata occurs most commonly with H. sorbyana (Jones), Eucytheridea bradii (Norman), Eucytheridea punctillata (Brady), Elofsonella concinna (Jones), Trachyleberis dunelmensis (Norman), and several species of Cytherepteron, the most common being C. arcuatum Brady, Crosskey & Robertson and C. nodosum Brady. This indicates that the species is marine. It has only been recovered from fine grained sediments and probably inhabits waters of no great depth on the continental shelf. Distribution: This species appears to be confined to the top 45m of the 130m of the Quaternary succession studied to date in the Forties Field. It only occurs in large numbers in one sample, at a depth of 22m below the sediment surface. There are no published records of the species. Explanation of Plate 4, 82 Fig. 1, 6 LV, ext. lat. (OS 7595, 950 pm long); fig. 2, 9 RV, int. lat. (OS 7598, 910 pm long). Scale A (200 pm\ x 80), figs. 1,2. Stereo-Atlas of Ostracod Shells 4, 83 Heterocyprideis macrotuberculata (5 of 8) Explanation of Plate 4, 84 Figs. 1, 2, ? RV (holotype, OS 7593): fig. 1, ext. ant. spines; fig. 2, ext. lat . , subcentral tubercle. Fig. 3, 9 LV, (OS 7594, 950 long), ext. lat., detail of ornament. Scale A (50 pm; x 450), fig. 1 ; scale B (100 //m; x 160), figs. 2, 3. 1 — C4-. ■I — 1-1- ■ iJ., +■ Stereo-Atlas of Ostracod Shells 4, 85 Heterocyprideis macrotuberculata (7 of 8) Explanation of Plate 4, 86 Figs. 1,2,9 RV (OS 7598): fig. 1 , int. lat., detail of muse. sc. ; fig. 2, int. lat., hinge. Fig. 3, 9 LV (holotype, OS 7593), ext. obi. ant. Scale A (100 pm\ x 160), figs. 1,2; scale B (200 ^m; x 80), fig. 3. . . Stereo-Atlas of Ostracod Shells 4 (14) 87 - 90 (1977) Progonocy there reticulata (1 of 4) 595.337.14 (1 16.222) (427.4: 162.001. 54):551. 351 + 552.54 ON PROGONOCYTHERE RETICULATA BATE by Lesley M. Sheppard (British Museum [Natural History] , London) Progonocythere reticulata Bate, 1963 1963 Progonocythere reticulata sp. nov. R.H. Bate, Bull. Br. Mus. nat. Hist.fGeol.) 9, 2, 27, pl.l , figs. 7 - 13, pi. 2, figs. 1-11. 1966 Glyptocythere reticulata (Bate); E. Brand & H.Malz, Senckenberg. leth. 47, pi. 60, figs. 94, 95. Holotype: Brit. Mus. (Nat. Hist.) 10 909, 9 carapace. Type locality: Basement Beds (marl facies), Bajocian, Eastfield Quarry, S Cave, Yorkshire, England. Grid. Ref.: SE 913323. Figured specimens: Brit. Mus. (Nat. Hist.) nos. 10 909 (9 car.: PI. 4, 88, fig. 1), 10 913 (d LV: PI. 4, 88, fig. 2), 10 917 (d RV: PI. 4, 88, fig. 3), 10 5498 (9 LV: PI. 4, 90, fig. 1), 10 5499 (9 car.: PI. 4, 90, fig. 3), 10 5500 (dear.: PI. 4, 90, fig. 2). All specimens are from the type locality and level. Explanation of Plate 4, 88 Fig. 1 , 9 car., ext. rt. lat. (holotype, 10 909, 595 pm long); fig. 2, d LV, ext. lat. (paratype, 10913, 663/xm long); fig. 3, d RV, ext. lat. (paratype, 10 917, 654 pm long). Scale A (100 pm; x 94), fig. 1 ; scale B (200 pm; x 98), figs. 2, 3. t~U4. Stereo-Atlas of Ostracod Shells 4, 89 Progonocythere reticulata (3 of 4) Diagnosis: Species of Progonocythere with strongly reticulate shell surface, the ornamentation comprising 4 - 5 sided pits which increase in size towards the centre of the carapace. Remarks: This is the most ornate of all Progonocythere species and the oldest of the Progonocythere/Glyptocythere lineage. Features characteristic of both genera can be seen but the shape and form of both dimorphs so strongly resemble that of P. cristata Bate, particularly the concave posterodorsal slope well displayed in the male, that it is here considered a species of Progonocythere. Currently it is used as the index species of the P. reticulata Subzone (lower part of the discites ammonite zone) at the base of the Bajocian. Distribution: A marine species. Apart from the type locality where it is a common ostracod it has so far only been found elsewhere in the Hydraulic Limestone of Kirkham Priory and near Castle Howard, Yorkshire, England. Explanation of Plate 4, 90 Fig.l , 9 LV, ext. lat. (10 5498, 544 pm long); fig. 2, 9 car., ext. vent. (10 5499, 612 pm long); fig. 3,d car., ext. dors. (10 5500, 646 pm long). Scale A (100 pm; x 1 10), fig. 1 ; scale B (100 pm; x 98), fig. 2; scale C (100 pm; x 100), fig. 3. Stereo-Atlas of Ostracod Shells 4, 88 Progonocythere reticulata (2 of 4) Stereo-Atlas of Ostracod Shells 4, 90 Progonocythere reticulata (4 of 4) . - Stereo-Adas of Ostracod Shells 4 (15) 91 - 94 (1977) Glyptocy there oscillum (1 of 4) 595.337.14 ( 1 1 6. 222)(423.8 : 1 62.003.5 1 ): 5 51.351 + 552.52 ON GLYPTOCYTHERE OSCILLUM JONES & SHERBORN by Lesley M. Sheppard (British Museum [Natural History] , London ) Glyptocythere oscillum (Jones & Sherborn, 1888) 1888 Cy there oscillum sp. nov. T.R. Jones & C. D. Sherborn, Proc. Bath Nat. Hist. Fid. Cl. 6, 254, pi. 3, figs. 8a - c. 1888 Cytheridea striblita sp. nov. T.R. Jones & C.D. Sherborn, Ibid., p. 268, pi. 3, figs. 7a - c. 1969 Glyptocythere oscillum (Jones & Sherborn); R.H.Bate, Bull. Br. Mus. nat. Hist. (Geol.) 17, 8, 412, pi. 5, fig. 2, pi. 12, fig. 2. Holotype: Brit. Mus. (Nat. Hist.) 1 1849, 9 RV. Type locality: Blue Fullers’ Earth Clay, Bathonian; Midford, Somerset, England. Grid. Ref.: ST 765605. Figured specimens: Brit. Mus. (Nat. Hist.) nos. I 1849 (9 RV: PI. 4,92, fig. 1), 10 3916 (d RV: PI. 4, 92, fig. 3), 10 3943 (6 LV: PI. 4, 94, fig. 3), 10 5495 (6 LV: PI. 4, 94, fig. 2), 10 5496 (9 car.: PI. 4, 94, fig. 5), 10 5497 (9 RV: PI. 4,94, fig. 1), 10 5501 (9 LV: PI. 4, 92, fig. 2; PI. 4, 94, fig. 4), 10 5502 (9 car.: PI. 4, 94, fig. 6). Nos. I 1849, 10 3916, 10 3943 are all from the type locality and level. 10 5501 is from depth 20.50m - 20.80m, Bathonian, Upper Fullers’ Earth, Horsecombe Vale, I.G .S. Borehole 15, Somerset, England; Grid. Ref.: Explanation of Plate 4, 92 Fig. 1 , 9 RV, ext. lat. (holotype, I 1849, 552 pm long); fig. 2, 9 LV, ext. lat. (10 5501 , 484 pm long); fig. 3, 6 RV, ext. lat. (10 3916, 578 pm long). Scale A (100 pm; x 108), fig. 1 ; scale B (1 00 pm; x 1 23), fig. 2; scale C ( 100 pm; x 112), fig. 3. — t~t- Stereo-Atlas of Ostracod Shells 4, 93 Glyptocythere oscillum (3 of 4) Figured specimens: ST 755622. 10 5495 is from depth 10.30m - 10.60m, Upper Fullers’ Earth, Horsecombe Vale Borehole (contd.) 15. 10 5496 is from depth 48.73m - 49.60m, Upper Fullers’ Earth, Baggridge, I.G.S. Borehole 2, Somerset; Grid Ref.: ST 741560. 10 5497 and 10 5502 are both from the Combe Down Oolite, Baggridge Borehole (depths 8.23m -9.50m and 12.18 - 13.40m respectively). Diagnosis: Species of Glyptocythere having a carapace strongly ornamented by two lateral grooves which are joined by a narrow vertical groove passing between two irregular swollen areas. A broad dorso-median sulcus extends down to the median groove. Remarks: Cardinal angles particularly well developed in the right valve. Normal pore canals prominently displayed over carapace and yield sieve plates. Hinge has 5 - 6 terminal teeth in the right valve, a median loculate groove and is regarded as entomodont. G. oscillum is currently being used as the index ostracod indicating the base of ostracod zone 5 at the top of the hodsoni ammonite zone. Distribution: A marine species so far found in the Bathonian, Blue Fullers’ Earth Clay, Midford, Somerset; the Combe Down Oolite and Upper Fullers’ Earth, I.G.S. borehole no. 2, Baggridge, Somerset; the Upper Rags, I.G.S. borehole no. 3, Baggridge, Somerset; the Upper Fullers’ Earth, Horsecombe Vale, Somerset, and the Cornbrash, Kirtlington Cement Quarry, Oxon, England. rr Explanation of Plate 4, 94 Fig. 1,9 RV, int. lat. hinge (10 5497); fig. 2, 6 LV, int. lat. hinge (10 5495); fig. 3, 6 RV, ext. lat. (lectotype of C. striblita, 10 3943, 620 pm long); fig. 4, normal pore canal (10 5501); fig. 5, 9 car., ext. dors. (10 5496, 510 long); fig. 6, 9 car., ext. vent. (10 5502, 476 pm long). Scale A (100 pm; x 278), fig. 1 , scale B (100 pm; x 211), fig. 2; scale C (100 ,um; x 72), fig. 3; scale D (10 pm; x 647), fig. 4; scale E (100 pm; x 88), fig. 5; scale F (100 pm; x 94), fig. 6. Stereo-Atlas of Ostracod Shells 4, 92 Glyptocy there oscillum (2 of 4) Stereo-Atlas of Ostracod Shells 4, 94 Glyptocythere oscillum (4 of 4) ■ Stereo-Atlas of Ostracod Shells 4(16)95 -98(1977) Glyptocythere scitula (1 of 4) 595.337.14 (1 16.222)(427.4:162.001.54): 551.351 + 552.52 ON GLYPTOCYTHERE SCITULA BATE by Lesley M. Sheppard (British Museum [Natural History] , London) Glyptocythere scitula Bate, 1965 1 965 Glyptocythere scitula sp. nov. R.H. Bate, Bull. Br. Mus. nat. Hist. (Geol.) 11,3, 1 08, pi. 7, figs. 1 - 1 3, pi. 8, figs. 1 - 9, pi. 9, figs. 1 - 4. Holotype: Brit. Mus. (Nat. Hist.) 10 1750, 9 carapace. Type locality: Bed 5, Glyptocythere scitula Zone, Grey Limestone Series, Bajocian; Yons Nab Headland, Cayton Bay, Yorkshire, England. Grid. Ref.: TA 082843. Figured specimens: Brit. Mus. (Nat. Hist.) nos. 10 1750 (9 car.: PL 4, 96, fig. 1 ; PI. 4, 98, fig. 4), 10 1751 (<5 LV: PI. 4, 98, fig. 3), 10 1754 (9 LV: PI. 4, 96, fig. 2), 10 1756(9 RV: PI. 4, 98, fig. 2). 10 1765 (6 car.: PI. 4, 98, fig. 5), 10 1772 (V:: Stereo-Atlas of Ostracod Shells 4 (22) 131 - 134 (1977) Ommatokrithe prolata (1 of 4) 595.337.14 ( 1 1 8.2 1 1 )(678:1 63.039. 1 0): 551.351 + 552.52 ON OMMATOKRITHE PROLATA AHMAD gen. et sp. nov. by Manzoor Ahmad (University of Hull, England) Genus OMMATOKRITHE gen. nov. Type-species: Ommatokrithe prolata sp. nov. Greek omma, ommatos, eye + krithe, the genus (Greek for ‘barley’). Gender, feminine. Lateral surface with a distinct glassy eye tubercle just below the anterodorsal cardinal angle. Hinge adont with a groove in the left valve widening towards the front and slightly locellate in the posterior quarter. Normal pores are of sieve type. So far all known genera in the family Krithidae are blind. The new genus, although identical in other features to Krithe Brady, Crosskey & Robertson, 1874, can easily be distinguished by its distinct eye tubercle. Derivation of name: Diagnosis: Remarks: Explanation of Plate 4, 132 Fig. 1 , 9 LV, ext. lat. (holotype, OS 7768, 744 pm long). Figs. 2, 3, <5 LV (paratype, OS 7769, 780 pm long): fig. 2, ext. lat.; fig. 3, hinge. Scale A (200 pm \ x 128), fig. 1 ; scale B (200 pm \ x 1 23), fig. 2 ; scale C ( 1 00 pm \ x 260), fig. 3. -T-tr ■H — i-r- TT •F cj- i — i-t- Stereo-Atlas of Ostracod Shells 4, 133 Ommatokrithe prolata (3 of 4) Ommatokrithe prolata sp. nov. Holotype: Brit. Mus. (Nat. Hist.) coll. no. OS 7768, 9 LV. [paratypes: Brit. Mus. (Nat. Hist.) coll. nos. OS 7769 - OS 77711. Type locality: Derivation of name: Diagnosis: Figured specimens: Distribution: S Mtwero, in sisal waste gully, Tanzania; lat. 9° 55' S, long. 39° 44'E. Miocene. Latin prolatus = elongated. A species with 14 anterior marginal pore canals, all except one concentrated anteroventrally and three along the mid-ventral margin. Sexual dimorphism is present. Brit. Mus. (Nat. Hist.) coll. nos. OS 7768 (9 LV: PL 4, 132, fig. 1), OS 7769 (