A Stereo-Atlas of Ostracod Shells

edited by R. H. Bate, D. J. Horne, J. W. Neale,
and David J. Siveter

Volume 11, Part 1; 29th June, 1984

Published by the British Micropalaeontological Society, London

Editors

Dr R.H. Bate, SSI (UK) Ltd., Tannery House, Tannery Lane, Send, Woking, Surrey GU23 7EF.
Prof. J.W. Neale, Department of Geology, The University, Hull HU6 7RH.

Dr D.J. Horne, Department of Geology, City of London Polytechnic, Walburgh House, Bigland Street,
London El 2NG.

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. Colin, 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 R.H. Bate, SSI (UK) Ltd., Tannery House, Tannery Lane, Send, Woking, Surrey
GU23 7EF.

Secretary Dr P.P.E. Weaver, Institute of Oceanographic Sciences, Brook Road, Wormley, Godaiming,
Surrey GU8 5UB. Tel: 042-879 4141.

Treasurer Dr J.E. Whittaker, Department of Palaeontology, British Museum (Natural History),
Cromwell Road, London SW7 5BD. Tel: 01-589 6323.

Journal Editor Dr. L.M. Sheppard, SSI (U.K.) Limited, Tannery House., Tannery Lane, Send, Woking,
Surrey GU23 7EF.

Newsletter Editor Dr R.L. Austin, Department of Geology, The University, Southampton S09 5NH.
Tel: (0703) 559122/557941.

Conodont Group Chairman Dr R.L. Austin, Department of Geology, The University, Southampton
S09 5NH.

Secretary Dr H. A. Armstrong, Department of Geology, The University, Newcastle-upon-Tyne NE1 7RU.
Tel: (0632) 328511.

Foraminifera Group Chairman Dr M.D. Brasier, Department of Geology, University of Hull, Hull HU6 7RX.
Secretary Dr J.V. Weston, SSI (UK) Ltd., Tannery House, Tannery Lane, Send, Woking GU23 7EF.
Tel: (0483) 223902.

Microplankton Group Chairman Dr G.C. Wilkinson, Britoil, 150 St. Vincent Street, Glasgow G2 5LJ.
Secretary Dr S.G. Molyneux, British Geological Survey, Ring Road, Halton, Leeds LS15 8TQ. Tel: (0532)
605343.

Ostracod Group Chairman Dr J. Athersuch, B.P. Research Centre, Chertsey Road, Sunbury-on-Thames,
Middlesex TW16 7LN.

Secretary Mr. I.P. Wilkinson, British Geological Survey, Nicker Hill, Keyworth, Nottingham NG12 5GG.
Tel: (06077) 6111.

Palynology Group Chairman Dr M.C. Boulter, Palynology Research Unit, N.E. London Polytechnic,
Romford Road, London E15 4LZ.

Secretary Mr N. Hooker, Britoil, 150 St. Vincent Street, Glasgow G2 5LJ. Tel: 041-204 2525.
Calcareous Nannofossil Group Chairman Dr M.K.E. Cooper, SSI (UK) Ltd., Tannery House, Tannery
Lane, Send, Woking GU23 7EF.

Secretary Miss H. Stowe, Micropalaeontology Unit, University College, Gower Street, London WC1E 6BT.
Tel: 01-387 7050.

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 of Hemicythere villosa (Sars, 1866)

Printed in the UK by UPS Blackpool Ltd., Stanley Road, Blackpool

Stereo-Atlas of Ostracod Shells 11 (1) 1-4 (1984) Hippula turris (1 of 4)

595.336.13 (113.312) (430.2 : 161.013.54) : 551.35+ 552.55

ON HIPPULA (CETONA) TURRIS (SCHALLREUTER)

by Roger E. L. Schallreuter
(University of Hamburg, German Federal Republic)

Hippula (Cetona) turris Schallreuter, 1967

1967 Oecematobolbina (Cetona) turris sp. n. R. E. L. Schallreuter, Neus . Jb. Geol. Palaont. Mh . , 1967 (7), 445, 446, fig. 7.3-4.

1970 Hippula turns ', R. E. L. Schallreuter, Hercynia N. F., 6 [1969] (3), tab. 2 (294/5).

1973 Hippula (Cetona) turris (Schallreuter); W. Neben & H. H. Krueger, Staringia, 2, pi. 94, fig. 6.

1977 Hippula turris ', R. E. L. Schallreuter, Palaont, Z., 51 (1/2), 38.

1980 Hippula (Cetona) turris (Schallreuter); R. E. L. Schallreuter & M. Kruta, Neus. Jb. Geol. Palaont. Mh., 1980 (8), 506.

1982 Hippula turns', R. E. L. Schallreuter, Palaeontographica (A), 178 (1/3), 27.

Holotype: Sektion Geologische Wissenschaften, University of Greifswald, German Democratic Republic; no.

29/15, posteriorly incomplete 9LV.

Type locality : Beach at Dornbusch, Isle of Hiddensee (Baltic Sea), Germany; lat. 54°36'N, long. 13° 7' E,

Backsteinkalk erratic boulder (no. and type 1 B 1 ; equivalent of the upper Viruan Skagen Limestone
of Central Sweden), middle Ordovician.

Figured specimens: Geologisch-Palaontologisches Institut und Museum, University of Hamburg (GPIMH) nos. 2739

( 9RV: PI. 11, 2, fig. 1), 2740 (cTLV: PI. 11, 2, fig. 2) and 2741 (posterodorsally incomplete 9LV:
PI. 11, 4, figs. 1, 2). Nos. 2739 and 2740 are from Backsteinkalk erratic boulder no. Gis 30 (type
1B14; equivalent of the upper Viruan upper Dalby Limestone of Central Sweden), from the beach
of Gislovshammar, SE Scania, Sweden; lat. 55° 29' N, long. 14° 18' E; coll, by the author in 1978.
No. 2741 is from Backsteinkalk erratic boulder no. Stal (type 1B1), from the beach at Staberhuk,
Isle of Fehmarn (Baltic Sea), Germany ; lat. 54° 24.5' N, long. 11° 19' E; coll, by the author in 1980.

Explanation of Plate 11, 2

Fig. 1, 9RV, ext. lat. (GPIMH 2739, 1.13 mm long excluding spines); fig. 2,cfLV, ext. lat. (GPIMH 2740. 1.05 mm long excluding
spines). Scale A (100 /nm; x 72), fig. 1; scale B (100 /tm; x 91), fig. 2.

Stereo- Atlas of Ostracod Shell 11, 3 Hippula turris (3 of 4)

Diagnosis: Species of Hippula (Cetona) with S2 distinct, long and sigmoidal, dorsally rather deep. Preadduc-

torial node rather distinct; a relatively broad, conical bulb. Posteroventral lobe strongly developed,
stituated ventrocentrally, ending in a long reticulate spine. Velar flange in males forming an angle
with the lateral surface of about 90°, in females rather obtuse. Torus very broad (transverse), nearly
(9) or as broad (tf) as velar flange. Adult valves c. 1.00-1.13 mmm long (excluding spines). Length:
height ratio 1.60-1.80.

Remarks: Ivanova ( Trudy-paleont . Inst., 172, 36, 1979) considered the cavities of the “histial” flange of the

females of Oecematobolbina as a prototype of the locular type of dimorphism. This is considered
impossible because loculi are always formed on the inner side of the dolon (the antrum), not the outer
side.

Copeland (Bull. geol. Surv. Can., 347, 16, 1982) considered Schallreuter’s subgeneric distinc-
tion within Hippula untenable in the light of his material from the District of Mackenzie, Canada.
In H. varicata he described the “histium” as consisting of three fluted flanges on the heteromorphic
valve, and a single flange on the tecnomorphic valve. He could not observe this phenomenon in the
European material. As shown herein (PI. 11. 2, fig. 2) the males also possess the characteristic torus
with an entervening row of diamond-shaped spaces. Perhaps the North American forms exhibit a
tendency to reduce the tori. Parahippula ventrospinosa (Kraft, Mem. geol. Soc. Am., 85, 1962)
resembles Hippula in having radiating furrows of the velar flange in both dimorphs (op. cit., pi. 11,
figs. 14a, 15, 17, pi. 12, figs. 4, 5, 7 cf. PI. 11, 2, figs. 1, 2). Such furrows could be the rudiments of the
cavities. The missing tori in the tecnomorphs of H. varicata could be explained as an example of
proterogenesis.

Distribution: Known only from upper Viruan Backsteinkalk erratic boulders of northern Germany and southern

Sweden (types 1B1, 1B3, IB 14, cf. R. E. L. Schallreuter, op. cit., 1970), middle Ordovician.

Explanation of Plate 11, 4

Figs. 1-2, posterodorsally incomplete 9LV (GPIMH 2741, 1.07mm long excluding spines): fig. 1, ext. lat.; fig. 2, ext. ventrolat.
Scale A (100/u.m; x 82), figs. 1, 2.

Stereo- Atlas of Ostracod Shells 11,4 Hippula turns (4 of 4)

Stereo-Atlas of Ostracod Shells 11 (2) 5-8 (1984) Schallreuteria lippensis (1 of 4)

595.336.13 (113.312) (430.1:161.010.54) : 551.35 + 552.55

ON SCHALLREUTERIA (LIPPEA) LIPPENSIS SCHALLREUTER

subgen. et sp. nov.

by Roger E. L. Schallreuter
(University of Hamburg, German Federal Republic)

Genus SCHALLREUTERIA Siveter, 1982

1982 Schallreuteria gen. nov.; D. J. Siveter, Stereo-Atlas of Ostracod Shells, 9, 93-100, pis. 9, 94; 9, 96; 9, 98; 9, 100.

Subgenus LIPPEA subgen. nov.

Type-species: Schallreuteria (Lippea) lippensis sp. nov.

As for the type-species.

Subgenus of Schallreuteria with only one sulcus (S2) and less pronounced quadrilobation.

The type-species of Schallreuteria, S. superciliata (Reed, 1910), from the Longvillian (Caradoc
Series) of England, is distinctly quadrilobate (cf. Siveter, op. cit.) and is thus considered a more
conservative form. It belongs to the main line of the genus from which S. ( Lippea ) is separated by its
loss of quadrilobation which occured at the latest by the lower upper Viruan (= Hamagian/Soudleyan).
The characteristic dorsal spines of lobes LI and L3 of S. superciliata are also present in 5. lippensis
(cf. Siveter, op. cit., PI. 9, 96, fig. 2).

The main differences between S. (Schallreuteria) and 5. (Lippea) are the same as in the genera
Rakverella and Pectidolon . Therefore, Pectidolon is now considered to be a subgenus of Rakverella.
Rakverella is characterized by special cristae which are not present in Schallreuteria (Siveter, 95).
Schallreuteria (Lippea) lippensis sp. nov.

1970 Rakverella pectinata-, R. E. L. Schallreuter, Hercynia N. F., 6, (3), 289, tab. 2 (292, 293) (pars).

1973 Rakverella pectinata (Oepik); W. Neben & H. H. Krueger, Staringia, 2, pi. 92, fig. 5.

Explanation of Plate 11, 6

Figs. 1-4, ?LV (holotype, GPIMH 2900, 1353 ;u.m long): fig. 1, ext. lat. ; fig. 2, ext. vent, obi.; fig. 3, ornament of lateral surface (pillars,
removed pillars, and reticulation); fig. 4, detail of surface reticulation.

Scale A (250 ^.m; x 58), figs. 1-2; scale B (50 /xm; x 290), fig. 3; scale C (50 gm; x 225), fig. 4.

Derivation of name:
Diagnosis:
Remarks:

Stereo- Atlas of Ostracod Shells 11, 7 Schallreuteria lippensis (3 of 4)

1976 Rakverella pectinata (Opik); R. E. L. Schallreuter, Palaeontographica (A), 153 (4/6), 203-205 (pars), pi. 6(39), figs. 1, 2.

1983 Rakverella pectinata (Opik); R. E. L. Schallreuter, Palaeontographica (A), 180 (4/6), 165, 166, 179 (pars), pi. 11, fig. 3.

Holotype:
Type locality:

Derivation of name:
Figured specimens:

Diagnosis:

Remarks:

Distribution:

Geologisch-Palaontologisches Institut und Museum, University of Hamburg (GPIMH), no. 2900,?
LV. [Paratypes: nos. 2902-2904].

Lower upper Viruan (middle Ordovician) 14B2-type Backsteinkalk erratic boulder of the Baltic
group (cf. R. E. L. Schallreuter 1970, op. cit., 287), no. Lipl, from the beach at Lippe, Hohwacht
Bay, Baltic Sea, Germany; lat. 54° 20.5' N,long. 1(> 38.5' E.

After the type locality.

GPIMH nos. 2900 ( ? LV : PI. 11, 6, figs. 1-4; PI. 11, 8, fig. 2), 2902(?RV:P1. 11, 8, fig. l)and 2901
(?RV : PI. 11, 8, fig. 3). Nos. 2900 and 2902 are from the type locality; boulder collected by the
author in July 1983. No. 2901 is from Backsteinkalk erratic boulder no. G29 (cf. Schallreuter 1983,
op. cit., 165); lat. 57° 18' N,long. 18° 8' E.

Species of S. (Lippea) with LI as a strong, broad dorsal spine, L2 a slender dorsal spine; weak pre-
adductorial node and weak anteroventral node; L3 an elongate lobe with strong dorsal spine and
weak posteroventral lobe-like elevation; L4 a slender dorsal spine and very weak ventral inflation.
Only weak laterovelar furrow. Special reticulation (net standing on pillars), different on lateral
surface and dolon. Females 1.30-1.39 mm long.

The material was formerly assigned by Schallreuter (1983) to Rakverella pectinata (Opik), which
was considered by Henningsmoen (1953) and Sarv (1959) as synonymous with R. bonnemai
(Schallreuter 1976, op. cit., 204). The more abundant and better preserved material now in hand
shows that the material does not belong to R. pectinata and that Henningsmoen and Sarv were
apparently correct in considering that species synonymous with R. bonnemai. The holotype of R.
pectinata is a steinkern, but the size and arrangement of the posterior spines is similar to that of
R. bonnemai.

Backsteinkalk erratic boulders (14B2-type) of northern Germany and Sweden (Isle of Gotland,
Baltic Sea). Boulders Lipl, 14B2, 812, G14, G29 and G39; middle Ordovician.

Explanation of Plate 1 1, 8

Fig. 1, ?RV, ext. lat. (paratype, GPIMH 2902, 1314 long); fig. 2, ?LV, detail of ornament of dolon (holotype, GPIMH 2900); fig. 3,
9RV, int. lat. (GPIMH 2901, 1390 pm long). Scale A (250/xm; x 59.5), figs. 1, 3; scale B (50/xm; x 350), fig. 2.

Stereo-Atlas of Ostracod Shells 11. 6

Schallreuteria lippensis (2 of 4)

Stereo-Atlas of Ostracod Shells 11,8

Schallreuteria lippensis (4 of 4)

Stereo-Atlas of Ostracod Shells 11 (3) 9-12 (1984) Duringia spinosa (1 of 4)

595.336.13 (113.313) (430.2 : 161.011.50) : 551.35 + 552.55

ON DURINGIA SPINOSA (KNUPFER)

by Roger E. L. Schallreuter
( University of Hamburg, German Federal Republic)

Genus DURINGIA gen. nov.

Type-species: Eurychilina spinosa Kniipfer, 1968

Derivation of name: Duringia, an old name for Thiiringen, the country of the type locality of the type-species.

Diagnosis: A medium-sized, possible genus of the Piretellinae, with S2 long and sigmoidal and preadductorial

node as a distinct bulb. Tecnomorphic velum appears as a row of spines. Females with a strongly
convex tubulose dolon, having a row of spines sited at the border of the lateral and marginal surfaces.
Lateral surface spinose.

Remarks: The presumably tubulose velum places the genus within the Eurychilinacea. The female velum

mostly resembles that of Piretella (cf. Schallreuter, Palaeontographica (A) 149 (4/6), pi. 26(5),
figs. 1, 4, 6, pi. 27(6), fig. 1) but the dolonal spines are missing in Piretella. Another distinguishing
feature is the long sigmoidal S2 of Duringia which is present elsewhere notably in the Oepikiidae
(Schallreuter, op. cit., 175). The assignment of Duringia to the Piretellinae (Eurychilinidae) is
therefore questionable.

With respect to the tecnomorphic velar spines and the female dolonal spines Duringia
strongly resembles Hithis (cf. Schallreuter, Palaeontographica (A), 144(1/3), pi. 17, figs. 1-3, 1973;
Schallreuter & Siveter, StereoAtlas Ostracod Shells, 9 (2) 15, 85-88, 1982), Piretia (Schallreuter,
op. cit., pi. 17, fig. 7, pi. 18, fig. 1) and Bromidella (Copeland, Bull. geol. Surv. Can., 347, pi. 2,
figs. 21, 22, 1982), but in all these cases the dolon exhibits no tubules.

Explanation of Plate 11, 10

Fig. 1, dors, and posterovent. incomplete ?9LV, ext. lat. (GPIMH 2727, 1.19mm long); fig. 2, fragmentary ?LV, int. obi. (GPIMH
2728); fig. 3, posterovent. incomplete tecnomorphic LV, ext. lat. (GPIMH 2729, 0.83 mm long excluding spines).

Scale A (100 /am; x 65), figs. 1, 2; scale B (100 pm; x 90), fig. 3.

Stereo- Atlas of Ostracod Shells 11, 11 Duringia spinosa (3 of 4)

Duringia spinosa (Kniipfer, 1968)

1963 Eurychilina', H.Blumenstengel et. al., Geol. Ges. DDR Exkursionsfuhrer zur Herbsttagung, 1963, 6.

1968 Eurychilina spinosa n. sp. J. Kniipfer, Freiberger ForscHft. (C), 234, 9, 10, 24, 25, pi. 4, figs. la-b.

1973 Piretia ? spinosa (Kniipfer); R. E. L. Schallreuter , Palaeontographica (A), 144 (1/3), 89.

1980 Piretia ? spina (Kniipfer); G.Qvale, Norsk geol. Tidsskr. 60 (2), 94.

Holotype:
Type locality:

Figured specimens:

Diagnosis:

Remarks:

Distribution:

Geologisches Institut, Bergakademie Freiberg, Sachsen, German Democratic Republic; no.
45/1024, larval RV.

Middle adit of the Iron-ore mine Gebersdorf, Thuringia; lat. 50° 32' N, long. 11°17'E; limestone
layer of the upper layer of the Upper Ore Horizon (Oberes Lager des Oberen Erzhorizontes =
uppermost Caradoc, zone 13), Grafenthal series.

Geologisch-Palaontologisches Institut und Museum, University of Hamburg (GPIMH) nos. 2727
( 9LV: PI. 11, 10, fig. 1), 2728 (fragmentary 9 LV: PI. 11, 10, fig. 2), 2729 (larval LV: PI. 11, 10,
fig. 3), 2730 (larval RV: PI. 11, 12, fig. 1), 2731 (larval RV: PI. 11, 12, fig. 2) and 2732 (larval RV:
PI. 11, 12, fig. 3). All the figured specimens are from the limestone layer of the Upper Ore Horizon
of the former open-pit iron-ore mine Wittmannsgereuth, on the ‘Breiten Berg’ near Saalfeld,
Thuringia, German Democratic Republic (H. Blumenstengel et. al., op. cit., 5-7, fig. 1); lat. 50°
39' N,long. 11° 19.5' E; coll, by the author in about 1965. All the material is coarsely silicified.
As for the genus.

Kniipfer (1968) in his original description had in hand only tecnomorphs. He assigned the material
to Eurychilina apparently based only on its similarity withE. multipustulosa Swain (7. Paleont., 36
(4), 727, 1962), a species now placed in synonymy with Bromidella spiveyi (Copeland, Bull. geol.
Surv. Can., 347, 32, 1982). The latter species possesses an S2 sulcus developed as a pit (as in
Uhakiella ) and a dolon without tubules (op. cit., pi. 6, figs. 3-8, 20-22).

Known only from the type stratum in Thuringia, German Democratic Republic (localities given
above). Caradoc Series, Ordovician.

Explanation of Plate 11, 12

Fig. 1, posterodors. incomplete larval RV, ext. lat. (GPIMH 2730, 0.61 mm long excluding spines); fig. 2, larval RV, ext. lat. (GPIMH
2731, 0.70 mm long); fig. 3, early larval RV, ext. lat (GPIMH 2732, 0.47 mm long).

Scale A (100 pm-, x 100), fig. 1; scale B (100 jam; x 92), fig. 2; scale C (100 jam; X 135), fig. 3.

Stereo-Atlas of Ostracod Shells 11, 10

Duringia spinosa (2 of 4)

Stereo- Atlas of Ostracod Shells 11, 12

Duringia spinosa (4 of 4)

Stereo-Atlas of Ostracod Shells 11 (4) 13-16 (1984) Duringia triformosa (1 of 4)

595.336.13 (113.312) (429 : 162.005.51) : 551.35 + 552.55

ON DURINGIA TRIFORMOSA JONES sp. nov.

by C. R. Jones

( University of Leicester, England)

Duringia triformosa sp. nov.

Holotype:
Type locality:

Derivation of name:
Figured specimens:

Brit. Mus. (Nat. Hist.) no. OS 12261; 9LV.

Old quarry about 300 m south of Cwm Agol Farm, c. 7 km west of Llandeilo, Dyfed, Wales; approx,
lat. 51°51'N, long. 4°05'W (Nat. Grid. Ref. SN 56552070). Llandeilo ‘Flags’, Llandeilo Series,
middle Ordovician.

Latin, formosus, beautifully formed; alluding to the three distinct morphological forms.

Brit. Mus. (Nat. Hist.) nos. OS 12261 (holotype, 9 LV: PI. 11, 14, fig. 5), OS 12260 (juv. LV: PI. 11,
14, fig. 4), OS 12263 (cT? RV: PI. 11, 16, figs. 1, 2), OS 12262 (juv. RV: PI. 11, 16, figs. 3, 4), OS
12264 ( 9LV: PI. 11, 16, figs. 5, 6).

One specimen ( ?LV: PI. 11, 14, figs. 1-3) was broken after photography. All the figured
specimens are from the type locality and horizon, except for OS 12264, which comes from Capel
Dewi quarry, 350m west of Ffynnon-Dewi, c. 15.5km west of Llandeilo, Dyfed (N.G.R. SN
47472063); Llandeilo ‘Flags’, lower Llandeilo, middle Ordovician.

Explanation of Plate 11, 14

Figs. 1-3, ?LV (now broken, 1.30mm long): fig. 1, ext. lat; fig. 2, ext. ant; fig. 3, ext. vent. Fig. 4, juv. LV, ext. lat. (OS 12260, 1.02 mm
long). Fig. 5,9LV, ext. lat. (holotype, OS 12261, 1.23 mm long).

Scale A (250 /xm; x 42), figs. 1, 3; scale B (250 /xm; x 47), fig. 2; scale C (250 /xm; x 47), fig. 4; scale D (250/xm; x 45), fig. 5.

Stereo- Atlas of Ostracod Shells 11, 15 Duringia triformosa (3 of 4)

Diagnosis:

Remarks:

Distribution:

Duringia with diminutive preadductorial node. Narrow depression (= remnant S3?) from postero-
central region to dorsum. Females with weakly convex tubulose dolon, serrated distally. Tecno-
morphic velum as row of spines (juveniles), or ventral flange (males?). Lateral surface spinose and
granulose.

D. triformosa is only the second described species of the genus. The younger type-species, D. spinosa
(Kniipfer, 1968) (see Schallreuter, Stereo-Atlas of Ostracod Shells, 11 (3), 9-12, 1984), from the
uppermost Caradoc of Thuringia, closely resembles/), triformosa but for the presence of its dolonal
spines, more convex dolon, and lack of a remnant S3. Only one complete female valve of/), spinosa
is known (1.19mm long), which falls within the large size variation displayed by D. triformosa
(females from Llandeilo Series: 1.08-1.3+ mm long). Like the type-species, D. triformosa has a
tubulose velum, justifying inclusion of the genus within the Eurychilinacea. However, the familial
assignment of Duringia is questionable (Schallreuter, op. cit.). Schallreuter provisionally placed
Duringia in the Piretellinae (Eurychilinidae) because the dolon of D. spinosa is similar but it also has
dolonal spines not normally present in piretellines.Z). triformosa would support this assignment as it
too lacks dolonal spines. However, the sigmoidal S2 of Duringia remains strikingly opikiid-like. The
recognition of a remnant S3 (?) inD. triformosa may indicate quadrilobate ancestry; its familial
assignment is therefore still uncertain.

Llandeilo Series, and Costonian Stage, basal Caradoc Series, Dyfed, Wales and Harnagian Stage,
Caradoc of Shropshire, England.

Explanation of Plate 1 1, 1 6

Figs. 1, 2, ?d'RV (OS 12263, 1.27 mm long): fig. 1, ext. lat; fig. 2, ext. post. Figs. 3,4, juv. RV (OS 12262, 1.12 mm long): fig. 3, ext. ant.;
fig. 4, ext. lat. Figs. 5, 6, large 9 LV, broken posteriorly (OS 12264, 1.3+ mm long): fig. 5, ext. ant. obi.; fig. 6, serrated terminations of
the tubulose dolon.

Scale A (250 /xm; X 43), fig. 1; scale B (250/xm; x 45), fig. 2; scale C (250/xm; x 44), fig. 3; scale D (250 /im; x 46), fig. 4; scale E
(300 /xm; x 35), fig. 5; scale F (100 /xm; x 80), fig. 6.

Stereo-Atlas of Ostracod Shells 11, 14

Stereo- Atlas of Ostracod Shells 11, 16

Duringia triformosa (2 of 4)

Duringia triformosa (4 of 4)

I

Stereo-Atlas of Ostracod Shells 11 (5) 17-20 (1984) Hamanella implexa (1 of 4)

595.337.14 (118.15/118.21) (794 : 162.120.34) : 551.353 + 552.52

ON HAMANELLA IMPLEXA FINGER

by Kenneth L. Finger

( Chevron Oil Field Research Company, La Habra, California, U.S.A.)

Genus HAMANELLA Finger, 1983

Type-species (by original designation): Hamanella implexa Finger, 1983

Diagnosis: A genus of Trachyleberididae, subovate to subtrapezoidal in lateral view with uniformly coarse and

extensive reticulum, anterior and posterior ends narrow and comparatively smooth; in dorsal view
the carapace is bullet-shaped with short marginal extensions at anterior and posterior termina.
Muscle scar pattern consisting of V-shaped frontal scar and vertical row of four ovate adductor scars ;
dorsalmost adductor scar acutely angled posteriorly to those below it. Hingement holamphidont.

Remarks: The inclination of the dorsalmost adductor scar suggests an affinity with the Rocaleberidini, from

which Hamanella is otherwise morphologically distinct.

Hamanella implexa Finger, 1983

1983 Hamanella implexa sp. nov. K. L. Finger, Micropaleontology , 29 (1), 94, pi. 8, figs. 1-9, pi. 10, fig. 3.

Holotype: United States National Museum of Natural Flistory, Washington, coll. no. USNM 332113, ? car.

[Paratypes: United States National Museum of Natural History coll. nos. USNM 332114,
USNM 332115].

Explanation of Plate 11, 18

Figs. 1, 2, 2car. (holotype, USNM 332113, 700 pm long): fig. 1, ext. It. lat. ; fig. 2, ext. rt. lat. ; fig. 3, ?RV, int. lat. (paratype, USNM
332114, 670 pm long).

Scale A (250 ^m; x70), figs. 1-3.

Stereo-Atlas of Ostracod Shells 11, 19 Hamanella implexa (3 of 4)

Lower Rincon Formation, Los Sauces Creek, Santa Barbara County, California, U.S.A. ; lat.
34° 22' N, long. 119° 25' W. Latest Zemorrian (Oligo-Miocen e), Hanzawaia crassisepta Zone; thin-
bedded calcareous mudstones interpreted by Finger {Ibid.) as distal-fringe turbidites deposited at
> 2000 m depth.

United States National Museum coll. nos. USNM 332113 (holotype,? car.: PI. 11, 18, figs. 1, 2;
PI. 11, 20, fig. 4), USNM 332114 (paratype, 9 RV: PI. 11, 18. fig. 3), USNM 332115 (paratype, d
car.: PI. 11, 20, figs. 1-3). All from the type locality.

As for the genus. Hamanella is presently regarded as a monotypic genus.

The reversed valve overlap seen in all specimens obtained from Santa Barbara County is of
questionable taxonomic value. I have examined an unnamed form from the Saucesian (lower
Miocene) of adjacent Kern County that displays normal valve overlap and is otherwise not too
dissimilar from H. implexa.

Currently known only from the latest Zemorrian (Oligo- Miocene) of the Santa Barbara Embay -
ment, California, U.S.A.

Text-fig. 1 Composite drawing of//, implexa, ? RV, internal view (x 70).

Explanation of Plate 11, 20

Figs. 1-3, d car. (paratype, USNM 332115, 840 pm long): fig. 1, ext. It. lat; fig. 2, ext. rt. lat.; fig. 3, ext. dors.; fig. 4,?car., ext. dors.

(holotype, USNM 332113, 700 /xm long).

Scale A (250 /xm; x 70), figs. 1-4.

Type Locality:

Figured specimens:

Diagnosis:

Remarks:

Distribution :

Stereo- Atlas of Ostracod Shells 11 (6) 21-24 (1984) Sagmatocythere paracercinata (1 of 4)

595.337.14 (118.22) (420 : 162.005.50) : 551.351 + 552.52

ON SAGMATOCYTHERE PARACERCINATA WHATLEY & MAYBURY

sp. nov.

by R. C. Whatley & C. Maybury
( University College of Wales, Aberystwyth)

Sagmatocythere paracercinata sp. nov.

Holotype:
Type locality:
Derivation of name:

Figured specimens:

Brit. Mus. (Nat. Hist.) no. OS 12116, $RV.

[Paratypes: Brit. Mus. (Nat. Hist.) nos. OS 12117 - OS 12120].

Blue Clay, Sample No. 29, N W corner Vicarage Pit, St. Erth, Cornwall, England (Nat. Grid Ref.
SW 556352); Upper Pliocene

Latin, reflecting the close morphological and possible ancestral relationship of this species to
Sagmatocythere cercinata (Bonaduce, Masoli & Pugliese, 1976) ( Pubbl . Staz. zool. Napoli, 40,
394-395, pi. 11, figs. 6-9) from the Recent of the Gulf of Aqaba, Red Sea.

Brit. Mus. (Nat. Hist.) nos. OS 12116 (holotype, ?RV: PI. 11, 22, fig. 1), OS 12117 (crLY: PI. 11,
22, fig. 2), OS 12118 (cCRV: PI. 11, 22, fig. 3), OS 12120 (c/RV: PI. 11, 24, fig. 1, 3, 4), OS 12119
(cfLY: PI. 11, 24, fig. 2). All from the type locality and type horizon.

Explanation of Plate 1 1, 22

Fig. 1,9RV, ext. lat. (holotype, OS 12116, 400 ^.m long); fig. 2,d'LV, ext. lat. (paratype, OS 12117, 450/xm long); fig. S.cfRV, ext. lat.

(paratype, OS 12118, 440 pm long).

Scale A (lOO^im; x 140), figs. 1-3.

Stereo- Atlas of Ostracod Shells 11, 23 Sagmatocythere paracercinata (3 of 4)

Diagnosis:

Remarks:

Distribution:

A species of Sagmatocythere with a prominent alar process overhanging the ventral margin.
Reticulae irregular in the alar region and immediately anterior of the eye spot. Free marginal areas
flat and without reticulation.

The close similarity between S. cercinata and the new species has already been indicated, the major
differences being those of size and ornamentation; S. paracercinata is larger (5. cercinata , 360 pm
long) and has relatively and absolutely smaller fossae.

The Loxoconchidae are very diverse in the Upper Pliocene of N W France and St. Erth with
75 species/subspecies belonging to 1 2 genera. Sagmatocythere, represented by 18 species/subspecies
is the most diverse genus of the family. S. paracercinata is abundant in the St. Erth beds (204 adult
valves and 530 juvenile valves) but only one male right valve and two juvenile valves have been
recovered from France.

Upper Pliocene; St. Erth, Cornwall, England; Le Temple du Cerisier, S W of Rennes and from
Borehole 1549 at Saint- Jean-la-Poterie, S W of Redon, N W France.

Explanation of Plate 1 1, 24

Figs. 1, 3-4,cfRV (paratype OS 12120, 460 p,m long): fig. 1, int. lat.; fig. 3, ant. hinge element; fig. 4, post, hinge element. Fig. 2,d'LV,
int. lat. (paratype, OS 12119, 470 pm long).

Scale A (100 pm- x 140), figs. 1, 2; Scale B (20 pm- x 700), figs. 3, 4.

Stereo-Atlas of Ostracod Shells 11 (7) 25-28 (1984) Sagmatocy there pseudomultifora (1 of 4)

595.337.14 (118.22) (420 : 162.005.50) : 551.351 + 552.52

ON SAGMATOCYTHERE PSEUDO MULTIFORA MAYBURY & WHATLEY

sp. nov.

by C. Maybury & R. C. Whatley
(University College of Wales, Aberystwyth)

Sagmatocythere pseudomultifora sp. nov.

71981 Loxoconcha sp.; H. Hagn, H. Malz & E. Martini, Geologica bav., 82, 270, pi. 2, figs. 1, 2.

Holotype:
Type locality:
Derivation of name:
Figured specimens:

Brit. Mus. (Nat. Hist.) no. OS 12121, 9RV.

[Paratypes: Brit. Mus. (Nat. Hist.) nos. OS 12122 -OS 12126].

Blue Clay, Sample No. 29, N W corner Vicarage Pit, St. Erth, Cornwall, England (Nat. Grid Ref.
SW 556352); Upper Pliocene.

Latin, reflecting its close similarity to Sagmatocythere multifora (Norman, 1865) (In: G.S. Brady,
Nat. Hist. Trans. Northumberland & Durham, 1, 18-19, pi. 6, figs. 13-16).

Brit. Mus. (Nat. Hist.) nos. OS 12121 (holotype, $RV: PI. 11, 26, fig. 1), OS 12122 (c/LV: PI. 11,
26, fig. 2), OS 12123 (d-RV: PI. 11, 26, fig. 3), OS 12124 (9LV: PI. 11, 28, fig. 1), OS 12125 (?car.:
PI. 11, 28, fig. 2), OS 12126 (d'car.: PI. 11, 28, fig. 3). All from the type locality and horizon.

Explanation of Plate 11, 26

Fig. 1,$RV, ext. lat. (holotype, OS 12121, 460 jam long); fig. 2,d'LV, ext. lat. (paratype, OS 12122, 510/un long); fig. S^RV, ext. lat.

(paratype, OS 12123, 510 pm long).

Scale A (100 /xm; x 125), figs. 1-3.

Stereo- Atlas of Ostracod Shells 11, 27 Sagmatocythere pseudomultifora (3 of 4)

Diagnosis: A species of Sagmatocythere with an inconspicuous alar process and strong reticulation, the fossae

being particularly well-developed in the posterior and alar regions. A wide frill-like flange surrounds
the free marginal areas which are strongly laterally compressed.

Remarks: This species is probably synonymous with S. sp. (Hagn, Malz & Martini, 1981, op. cit.); but the

small illustrations and lack of a formal description for this species render this possibility tenuous.

S. pseudomultifora resembles S. multifora (Norman) in shape and gross morphology of
ornament, but differs in size (Norman’s species is smaller, only 390-395 /xm long) and in its pos-
session of a more regular reticulum and more strongly developed and acute alae. The two species
constitute what are in the authors’ opinion more typical members of the genus than the type-species,
5. napoliana (Puri, 1963) (Athersuch, Stereo-Atlas of Ostracod Shells, 3 (21), 117-124, 1976).

Distribution: S. pseudomultifora occurs abundantly in the Upper Pliocene St. Erth beds and is also present in the

deposits of three localities in N W France of Redonian age: Le Bosq d’Aubigny, Le Bosq d’ Aubigny
(Manche) and Le Temple du Cerisier. See J.-P. Margerel, Les Foraminiferes du Redonien. System-
atique, Repartition stratigraphique , Paleoecologie, Nantes I, 1-207, 1968, for geographical and
stratigraphical details of the French localities. The species probably also occurs in the Miocene of
S Germany (Hagn, Malz & Martini, op. cit.).

Explanation of Plate 1 1, 28

Fig. 1,9LV, int. lat. (paratype, OS 12124, 460 /xm long); fig. 2, ?car., ext. dors, (paratype, OS 12125, 470 /xm long); fig. 3, d'car., ext.

dors, (paratype, OS 12126, 510/xm long).

Scale A (100 /xm; x 125), figs. 1-3.

Stereo-Atlas of Ostracod Shells 11 (8) 29-36 (1984)

595.337.14 (118.15) (430.1 : 161.006.51) : 551.351 + 552.51

Cytheridea muelleri muelleri (1 of 8)

ON CYTHERIDEA (CYTHERIDEA) MUELLERI MUELLERI (V. MUNSTER)

by Roseline H. Weiss

(Geological Institute, University of Cologne, Germany)

Genus CYTHERIDEA Bosquet, 1852
Subgenus CYTHERIDEA Bosquet, 1852
Type-species (by original designation): Cy there Mullerii v. Munster, 1830

Diagnosis: The typical subgenus of Cytheridea with a special type of hinge: left valve with terminal loculate

sockets and a somewhat oblique median element, the anterior part of which is elevated while the
posterior part is depressed with respect to the dorsal margin.

Cytheridea (Cytheridea) muelleri muelleri (v. Munster, 1830)

? 1830 Cythere Mullerii Nob. v. Munster, Jb. Min. Geogn. Geol. Petref.-Kunde, 1, 63.

1838 Cytherina MiXlleri (v. Munster); F. A. Roemer, Neues Jb. Min. Geogn. Geol. Petref.-Kunde, 1838, 516, pi. 6, fig. 6.

non 1852 Cytheridea MiXlleri (v. Munster); J. A. H. Bosquet, Mem. cour. mem. sav. etrang., 24 (1850-1851), 39, pi. 2, figs. 4a-f.

? 1894 Cytheridea MiXlleri (v. Munster; E. Lienenklaus, Z. dt. geol. Ges., 46, 220.
non 1936 Cytheridea (Cytheridea) miXlleri (v. Munster); M. B. Stephenson, J. Paleont., 10, 699, pi. 94, figs. 1, 2, 7.

1952 Cytheridea miXlleri (v. Munster); F. Goerlich, Senckenbergiana , 33 (1/3), 188, figs. 6-12.

1955 Cytheridea miXlleri (v. Munster); H. J. Oertli & A. J. Key, Bull. Verein. schweiz. Petrol. -Geol. -Ing., 22(62), 21, pi. 1, figs. 15,

16.

Explanation of Plate 11, 30

Fig. 1, $car., ext. dors. (GIK 932-1704, 830 /xm long): fig. 2,q'car., ext. dors. (GIK 932-1702, 800 /xm long). Length includes marginal
spines. Scale A (100 /xm; x 113), figs. 1, 2.

Stereo-Atlas of Ostracod Shells 11, 31

Cytheridea muelleri muelleri (3 of 8)

1956 Cytheridea mullerii (v. Munster); H. J. Oertli, Schweiz, palaeont., Abh., 74 (1), 36, pi. 2, figs. 39-41.

? 1958 Cytheridea mullerii (v. Munster); F. Goerlich, Fortschr. Geol. Rheinld. Westf, 1, 216.

1958 Cytheridea mullerii (v. Munster) ; E. Triebel, in : H. Freund (Ed .),Handbuch der Mikroskopie in der Technik, Frankfurt, II,
3, 122, fig. 23.

non 1975 Cytheridea mullerii (v. Munster); M. Faupel, Gottinger Arb . Geol. Paldont., 17, 23, pi. 8, figs. 2a-b (= Cytheridea [C. ]
pernota Oertli & Key, 1955).

? 1980a Cytheridea muelleri muelleri (v. Munster); H. Uffenorde, Neues Jb. Geol. Paldont. Mh., 119.

1981 Cytheridea (Cytheridea) muelleri (v. Munster); H. Uffenorde, Palaeontographica Abt. A, 172 (4-6), 137, pi. 1, figs. 5, 8,
1983b Cytheridea (Cytheridea) muelleri muelleri (v. Munster); R.H. Weiss, Palaeontographica, Abt. A, 182 (4-6), 89, pi. 19, figs.
1, 2, 4, 5, 8, pi. 20, figs. 1-8, pi. 21, figs. 1-6, text-fig. 11.

Neotype:

Type locality:
Figured specimens:

The Ostracoda from the collections of v. Munster are presumed lost. The neotype is housed at
Forschungsinstitut Senckenberg, Frankfurt: X/e 1885, c/LV.

[Paraneotypes: Forschungsinstitut Senckenberg, X/e 1886-1890].

Astrup near Osnabriick, Germany. Upper Oligocene.

Geological Institute, University of Cologne, nos. 932-1008 (c^LV: PI. 11, 34, fig. 1), 932-1701
(c/car.: PI. 11, 32, fig. 1), 932-1702 ( tfcar.: PI. 11, 30, fig. 2), 932-1704 ( ?car.: PI. 11, 30, fig. 1),
932-1705 (c/RV.: PI. 11, 36, fig. 2), 932- 1706 (d/LV.: PI. 11, 32, fig. 2), 932-1707 ( ?RV; PI. 11,36,
fig. 1), 932-1713 (rfRV: PI. 11, 34, fig. 2).

All specimens were collected by Prof. E. K. Kempf in 1961 at a depth of 54.2-55.5 m from shaft
Tonisberg near Krefeld, Germany (German Nat. Grid Ref.: R 34033, H 97555; long. 6°29'E,
lat. 51°25' N); Upper Oligocene, Sphenolithus ciperoensis zone (NP25) according to Benedek &
Muller ( Neues Jb. Geol. Paldont. Mh., 1974, 388); fine sand (grain size 0.2-0.06 mm = 92.5%)
according to Kempf ( Niederrhein , 35, fig. 2, 1968) ; shallow marine (5-20 m water depth) according
to Goerlich ( Fortschr . Geol. Rheinld. Westf., 1, 220, 1958).

Explanation of Plate 11, 32

Fig. Ed' car., ext. vent. (GIK 932-1701, 825 /xm long); fig. 2,dXV, int. lat. (GIK 932-1706; 838 /xm long). Length includes marginal
spines. Scale A (100/xm; x 113), figs. 1, 2.

Cytheridea muelleri muelleri (2 of 8)

Stereo- Atlas of Ostracod Shells 11, 30

Stereo- Atlas of Ostracod Shells 11, 32

Cytheridea muelleri muelleri (4 of 8)

i

Stereo- Atlas of Ostracod Shells 11, 33

Cytheridea muelleri muelleri (5 of 8)

Sex

N

X

L (yam)
Min

Max

X

H (yam)
Min

Max

X

L/H

Min

Max

99RV

3

771

763

775

421

413

425

1.832

1.794

1.879

d'd' RV

3

784

763

800

396

375

413

1.980

1.939

2.033

99 LV

13

773

738

800

426

413

438

1.815

1.771

1.848

rfrfLV

13

784

750

825

408

375

438

1.923

1.854

2.035

L (/am)

W (yam)

L/W

Sex

N

X

Min

Max

X

Min

Max

X

Min

Max

9$ car.

16

774

738

813

355

338

388

2.179

2.138

2,257

d'd'car.

16

784

750

813

329

313

338

2.385

2.293

2.461

Table 1. Measurements on specimens (N = no. of specimens; x = mean; L = length without
marginal spines; H = height; W = width); A = valves, B = carapaces.

Diagnosis: Carapace ovate to subquadrangular in dorsal view; subtrapezoidal in lateral view, anterior end

obliquely rounded, posterior end obliquely truncated, narrowly rounded posteroventrally. Dorsal
margin straight to slightly convex; ventral margin straight (left valve) to very slightly concave in
posterior half (right valve). Surface of the valves pitted. Along the free margin the pits are arranged in
subparallel rows. Anterior end with marginal denticulations (right valve: up to 15; left valve: 7).
Posterior end of the right valve provided with three marginal spines. Anteriorly and posteroventrally
narrow vestibules are present.

Explanation of Plate 11, 34

Fig. l,c/LV, ext. lat. (GIK 932-1008, 825 gm long); fig. 2,d'RV, ext. lat. (GIK 932-1713, 813 yam long). Length includes marginal spines.
Both valves are from the same carapace. Scale A (100 yam; x 113), figs. 1, 2.

Stereo-Atlas of Ostracod Shells 11, 35

Cytheridea muelleri muelleri (7 of 8)

Remarks:

Distribution :

Acknowledgement:

Sexual dimorphism pronounced, the males being lower and, in dorsal view, narrower than the
females, but of the same length. Differences discussed in detail by Weiss (1983b, op. cit.).

The hinge of each valve is divided into three elements. The terminal elements are dentate
plates (right valve) or loculate sockets (left valve) ; the median element is oblique with respect to the
dorsal margin and the left valve provided with different types of toothlets.

Normal pores are moderately numerous, scattered and of the sieve - type. The sieve - plates
are perforated (approx. 6-12 small pores along the diameter); the setal perforation is eccentric.
Marginal pore - canals are numerous (approx. 40 anteriorly). They reach the shell surface distally of
the flange in two parallel lines. Occasionally a lip is developed around the openings. Line of con-
crescence and inner margin are slightly separated anteriorly and posteroventrally.

The investigated specimens from Tonisberg agree absolutely with Goerlich’s material from
the type-locality of Astrup. Many of the previous records described under this name by various
authors (Reuss 1850, Bosquet 1852, Jones 1857, Speyer 1863, Stanceva 1962, Faupel 1975) repre-
sent different species.

Upper Oligocene: Astrup near Osnabriick, Germany (v. Munster 1830, Lienenklaus 1894,
Stephenson 1936, Goerlich 1952, Oertli & Key 1955, Oertli 1956, Triebel 1958, op. cit.); Shaft
Rossenray (Lower Rhine Basin), Germany (Goerlich 1958, op. cit.) ; Shaft Tonisberg (Lower Rhine
Basin), Germany (Weiss 1983b, op. cit.); Niedersachsen (borings), Germany (Uffenorde 1980,
1981, op. cit.).

Thanks are due to the Deutsche Forschungsgemeinschaft for providing the Cambridge Stereoscan
180.

Explanation of Plate 11, 36

Fig. 1,$RV, int. lat. (GIK 932-1707, 800 (am long); fig. 2,d'RV, int. lat. (GIK 932-1705, 838 yam long). Length includes marginal spines.

PI. 11, 32, fig. 2 and PI. 11, 36, fig. 2 represent both valves of a single carapace.

Scale A (100 yam; x 113), figs. 1, 2.

Stereo-Atlas of Ostracod Shells 11, 36

Cytheridea muelleri muelleri (8 of 8)

Stereo-Atlas of Ostracod Shells 11 (9) 37-44 (1984) Cytheridea muelleri toenisbergensis (1 of 8)

595.337.14 (118.15) (430.1 : 161.006.51) : 551.351 + 552.51

ON CYTHERIDEA (CYTHERIDEA) MUELLERI TOENISBERGENSIS WEISS

by Roseline H. Weiss

( Geological Institute, University of Cologne, Germany)

Cytheridea (Cytheridea) muelleri toenisbergensis Weiss, 1983

1983b Cytheridea (Cytheridea) muelleri toenisbergensis subsp. nov. R. H. Weiss, Palaeontographica, Abt. A, 182 (4-6), 94, pi. 22,
figs. 1-10, text-fig. 12.

Holotype: Geological Institute, University of Cologne, Germany, GIK 932-1722, 9 car.

[Paratypes: Geological Institute, University at Cologne, GIK 932: 1709-1712, 1714-1719,
1722-1727],

Type locality: Shaft Tonisberg near Krefeld, Germany (German Nat. Grid Ref. : R 34033, H 97555 ; long. b° 29' E,

lat. 51°25'N).

Type horizon: Depth range 54.2-55.5 m; Upper Oligocene; Sphenolithus ciperoensis zone (NP25) according to

Benedek & Muller (Neues Jb. Geol. Paldont., Mh., 1974, 388 §); fine sand (grain size 0.2-0.06 mm =
92.5%) according to Kempf (Niederrhein, 35, fig. 2, 1968); shallow marine (5-20 m water depth)
according to Goerlich (Fortschr. Geol. Rheinld. Westf, 1, 220, 1958).

Figured specimens: Geological Institute, University of Cologne, nos. 932-1709 ( 9RV: PI. 11, 44 fig. 1), 932-1714

($LV: PI. 11, 42, fig. 1), 932-1716 (d-LV: PI. 11. 42, fig. 2), 932-117 ( dRV: PI. 11, 44, fig. 2),
932- 1718 (</ RV; PI. 11, 40, fig. 2), 932-1722 ( Scar. : PI. 11, 38, fig. 1), 932-1723 ( d'car. ; PI. 11.
38, fig. 2), 932-1724 (d car.: PI. 11, 40, fig. 1).

Explanation of Plate 11, 38

Fig. l,?car., ext. dors, (holotype, GIK 932-1722, 775/un long); fig. 2,c/car., ext. dors. (GIK 932-1723, 763 /Am long).
Scale A (100 /Ain; X 122), figs. 1, 2.

Stereo-Atlas of Ostracod Shells 11, 39

;

Cytheridea muelleri toenisbergensis (3 of 8)

Sex

N

X

L (/x.m)
Min

Max

X

H (/Am)
Min

Max

X

L/H

Min

Max

??RV

3

775

763

788

409

400

413

1.898

1.879

1.909

c/t/RV

3

779

775

788

388

388

388

2.010

2.000

2.032

99 LV

3

796

788

800

434

425

438

1.837

1.800

1.882

o'd'LV

3

800

800

800

409

400

413

1.959

1.939

2.000

L (/Am)

W (/Am)

L/W

Sex

N

X

Min

Max

X

Min

Max

X

Min

Max

9? car.

9

786

763

813

363

350

375

2.170

2.100

2.250

d'd'car.

7

786

763

813

326

312

338

2.406

2.296

2.480

Table 1. Measurements on specimens (N = no. of specimens; x = mean; L = length without
marginal spines ; H = height ; W = width) ; A = valves, B = carapaces.

Explanation of Plate 11, 40

Fig. l,d"car., ext. vent. (GIK 932-1724; 788 /Am long); fig. 2,d'RV, ext. lat. (GIK 932-1718; 800 /Ain long). Length includes marginal
spines.

Scale A (l00/*m; x 119), figs. 1, 2.

Stereo-Atlas of Ostracod Shells 11, 38 Cytheridea muelleri toenisbergensis (2 of 8)

Stereo-Atlas of Ostracod Shells 11, 41 Cytheridea muelleri toenisbergensis (5 of 8)

Diagnosis: A subspecies of Cytheridea (Cytheridea) muelleri with anterior end of carapace subrectangular in

dorsal view.

Remarks: Sexual dimorphism pronounced, the males being lower and, in dorsal view, narrower than the

females, but of the same length. Differences discussed in detail by Weiss (1983b, op. cit.).

In every respect, the internal features of the subspecies are very similar to the nominate sub-
species Cytheridea (C.) muelleri muelleri (v. Munster) from the Upper Oligocene of Astrup
(see Weiss, Stereo-Atlas of Ostracod Shells 11, 29-36, 1984). Only the median hinge element (left
valve) sometimes shows small differences in the shape of the toothlets.

The main difference is the subrectangular shape of the anterior end of the carapace in dorsal
view. Minor differences are observable at the posterior end of the right valves. This end is somewhat
more narrowly rounded and - as well preserved specimens show - provided with four marginal spines
instead of three. Similar to the nominate subspecies the central muscle scars consist of a row of four
undivided adductor muscle scars (the lower three are generally more elongate than the upper one), a
well- developed fulcral point and a frontal scar which is split into a larger posterior and a smaller
anterior part. The frontal scar occasionally shows a tendency to become V-shaped. There are also
two mandibular scars: the upper scar is more elongate and larger than the lower one (Text-fig. 1).

Explanation of Plate 11, 42

Fig. 1, ?LV, int. lat. (GIK 932-1714; 813 /xm long); fig. 2, d'LV, int. lat. (GIK 932-1716; 800 /xm long). Length includes marginal
spines.

Scale A (100 /xm; x 117), figs. 1, 2.

Stereo- Atlas of Ostracod Shells 11, 43

Cytheridea muelleri toenisbergensis (7 of 8)

Remarks:

(contd.)

Acknowledgement:

Cytheridea (C.) muelleri truncatula Goerlich, 1953
(Senckenbergiana, 34, 131, pi. 1, figs. 6 a-c) from the
Upper Oligocene of the Bavarian Molasse differs in
being shorter and having a different carapace outline in
lateral and dorsal view. The posterior end of the right
valve is provided with one marginal tooth only.
Cytheridea Mulleri, var. B acuminata Bosquet, 1852
(Mem. cour. mem. sav. etrang., 24, 39, pi. 2, figs. 4a-f)
from the Tortonian of the Vienna Basin was considered
to be a separate species by Goerlich (1953).

Cytheridea mullerii , var. helvetica Lienenklaus,
1896 (Abh. schweiz. Paldont. Ges., 22, 26, pi. 2, fig. 6)
from the Upper Oligocene of the Bavarian Molasse has
been linked with the genus Haplocytheridea by Goerlich
in 1953.

The Upper Oligocene Cytheridea muelleri, var.
rhenana Lienenklaus, 1905 ( Ber . senckenb. naturf. Ges.,
36, 39) from the Mainz Basin was transfered to
Hemicyprideis by Malz & Triebel in 1970.

Thanks are due to the Deutsche Forschungs -
gemeinschaft for providing the Cambridge Stereoscan
180.

O-

Text-fig. 1 central muscle scars of C. ( C.)
muelleri toenisbergensis (GIK 932-
1716). Scale A: 50/xm.

Explanation of Plate 11, 44

Fig. 1, ? RV, int. lat. (GIK 932-1709; 775 /xm long); fig. 2, cTRV, int. lat. (GIK 932-1717; 788 /xm long). Length includes marginal
spines. PI. 11, 42, fig. 2 and PI. 11, 44, fig. 2 represent both valves of a single carapace.

Scale A (100 /xm; x 117), figs. 1, 2.

Stereo-Atlas of Ostracod Shells 11 (10) 45-52 (1984) Cytheridea pernota (1 of 8)

595.337.14 (118.15) (430.1 : 161.006.51) : 551.351 + 552.51

ON CYTHERIDEA ( CYTHERIDEA ) PERNOTA OERTLI & KEIJ

by Roseline H. Weiss

(Geological Institute, University of Cologne, Germany)

Cytheridea (Cytheridea) pernota Oertli & Keij, 1955

1936 Cytheridea (Cytheridea) mulleri (v. Munster); M. B. Stephenson, J. Paleont., 10, 699, pi. 94, figs. 1, 2, 7.

1955 Cytheridea pernota sp. nov. H. J. Oertli & A. J. Key (= Keij ),Bull. Verein. schweiz. Petrol-Geol. u. -Ing., 22 (62), 19 (pars),
pi. 1, figs. 1-7 (non pi. 1, figs. 8-13), text-fig. 2.

1957 Cytheridea pernota Oertli & Keij; A. J. Keij, Mem. Inst. r. Sci. nat. Belg., 136, 56, pi. 3, figs. 22-26, pi. 4, fig. 19.

1972 Cytheridea pernota Oertli & Keij; M. C. Keen, Palaeontology , 15 (2), 289, pi. 56, fig. 2.

1975 Cytheridea mullerii (v. Munster); M. Faupel, Gottinger Arb . Geol. Palaont., 17, 23, pi. 8, figs. 2a, b.

1977 Cytheridea pernota Oertli & Keij ; Keen, in F. M. Swain (Ed.), Stratigraphic Micropaleontology of Atlantic Basin and Border-

lands, Develop. Palaeont. Stratigr., Amsterdam, 6, 485, pi. 1, figs. 10, 12.

1978 Cytheridea pernota Oertli & Keij; Keen, in R. FI. Bate & E. Robinson (Eds.), A Stratigraphical Index of British Ostracoda,
Geol. J. Spec. Issue, 8, 404, pi. 3, figs. 16, 18.

1981 Cytheridea ( Cytheridea) pernota Oertli & Keij s.l. ; H. Uffenorde, Palaeontographica, Abt. A, 172 (4-6), 138, pi. 1, figs. 9, 10,

13. .

1983b Cytheridea ( Cytheridea) pernota Oertli & Keij ; R. H. Weiss, Palaeontographica, Abt. A, 182 (4-6), 96, pi. 23, figs. 1-8, pi. 24,
figs. 1-8, text-fig. 13.

Explanation of Plate 11, 46

Fig. 1, c/car., ext. dors (GIK 932 -1737; 900 ^.m long); fig. 2, 9 car., ext. vent. (GIK 932-1734; 875 yu.m long). Length includes marginal
spines.

Scale A (100/u.m; x 105), figs. 1, 2.

Stereo- Atlas of Ostracod Shells 11, 47 Cytheridea pernota (3 of 8)

Holotype: Geol. Inst. Univ. Utrecht, Coll. S. 1558,9 RV.

[Paratypes: Coll. S. 1559-1589].

Type locality: Kleine Spouwen, Belgium. Hand-boring 5 (630 m N and 330 m E from the church tower of Kleine

Spouwen). Lower Rupelian; Nucula comta - clay.

Figured specimens: Geological Institute, University of Cologne, nos. 932-1728 ( 9 RV: PI. 11, 52, fig. 2); 932-1729

(c/LV: PI. 11, 50, fig. 2) ; 932-1730 ( 9RV: PI. 11, 48, fig. 2) ; 932-1731 (9 LV: PI. 11. 50, fig. 1) ; 932-
1732 ( 9 RV: PI. 11, 48, fig. 1); 932-1734 ( 9 car. : PI. 11, 46, fig. 2); 932-1736 (c/LV: PI. 11,52,
fig. 1); 932-1737 (d car.: PI. 11, 46, fig. 1).

All specimens were collected by Prof. E. K. Kempf at a depth of 54.2-55.5 m from shaft
Tonisberg near Krefeld, Germany (German Nat. Grid Ref.: R 34033, H 97555; long. 6° 29' E, lat.
51°25'N); Upper Oligocene; Sphenolithus ciperoensis zone (NP25) according to Benedek &
Muller (Neues Jb. Geol. Palaont. Mh., 1974, 388); fine sand (grain size 0.2-0.06 mm = 92.5%)
according to Kempf (Niederrhein, 35, fig. 2, 1968); shallow marine (5-20 m water depth)according
to Goerlich ( Fortschr . Geol. Rheinld. Westf, 1, 220, 1958).

Explanation of Plate 11, 48

Fig. 1,9 RV, ext. lat. (GIK 932-1732; 838^.m long); fig. 2,cfRV, ext. lat. (GIK 932-1730; 900 /xm long). Length includes marginal
spines. PI. 11, 48, fig. 1 and PI. 11, 50, fig. 1 represent both valves of a single carapace.

Scale A (100|U,m; x 105), figs. 1, 2.

Cytheridea pernota (2 of 8)

Stereo-Atlas of Ostracod Shells 1 1, 48

Cytheridea pernota (4 of 8)

Stereo- Atlas of Ostracod Shells 1 1, 46

I

!

Stereo-Atlas of Ostracod Shells 11, 49

Cytheridea pernota (5 of 8)

Size:

(A)

(B)

Sex

N

X

L

(/xm)

Min

Max

X

H (/xm)
Min

Max

X

L/H

Min

Max

9?RV

4

847

838

850

460

450

475

1.844

1.789

1.889

cfc/RV

5

883

875

888

458

438

475

1.930

1.869

1.998

$?LV

3

871

850

888

492

475

500

1.772

1.750

1.789

c/d'LV

4

897

888

900

478

475

488

1.876

1.820

1.895

L

(/xm)

W (/xm)

L/W

Sex

N

X

Min

Max

X

Min

Max

X

Min

Max

$$ car.

5

865

850

875

430

425

438

2.013

1.943

2.059

d'd'car.

6

902

875

938

404

388

425

2.234

2.176

2.290

Diagnosis

Table 1. Measurements on specimens (N = no. of specimens; x = mean; L = length without
marginal spines; H - height; W - width); A - valves, B - carapaces.

Carapace ovate with somewhat more narrowly rounded posterior end in dorsal view; in lateral view
subtrapezoidal, anterior end obliquely rounded, posterior end obliquely truncated and narrowly
rounded posteroventrally. Dorsal margin straight to slight convex; ventral margin straight (left
valve) to considerably concave in posterior half (right valve) Surface of the valves pitted. Along the
free margin the pits are arranged in subparallel rows. Anterior end of both valves with seven
marginal denticulations. Posterior end of the right valve provided with three marginal spines.
Anteriorly and posteroventrally narrow vestibules are present.

Explanation of Plate 11, 50

Fig. 1, ?LV, ext. lat. (GIK 932-1731; 850/xm long); fig. 2,d'LV, ext. lat. (GIK 932-1729; 900 gm long). Length includes marginal
spines. PI. 11, 48, fig. 2 and PI. 11, 50, fig. 2 represent both valves of a single carapace.

Scale A (100 yum; x 105), figs. 1, 2.

Stereo- Atlas of Ostracod Shells 11, 51

Remarks

Cytheridea pernota (7 of 8)

Sexual dimorphism pronounced. Shell morphotype B (presumed male) more elongate and in dorsal
view narrower than morphotype A. Differences discussed in detail by Weiss (1938b, op. cit.).

In respect of internal features, Cytheridea ( Cytheridea ) pernota is very similar to the type-
species Cytheridea (C.) muelleri (v. Munster, 1830).

Minor differences are observable in the shape of the toothlets of the median hinge element
(left valve) and in the lower mandibular scar. The latter is occasionally divided into two separate
scars. Unfortunately the small number of specimens at my disposal is not sufficient to give general
conclusions on these differences.

Distribution: Tongrian: Beukenberg near Tongeren, Zammelen, Kortessem, Oude - Biezen, Henis, Kleine -

Spouwen, Berg near Kleine - Spouwen: Belgium (Oertli & Key 1955, op. cit.).

Sannoisian: Bouldnor Cliff, Isle of Wight: England (Keen 1972, op. cit.); Cormeilles: France
(Keen 1977, op. cit.).

Rupelian: Kleine - Spouwen, Berg near Kleine - Spouwen, Katteberg near Bilzen: Belgium
(Oertli & Key 1955, op. cit.); Bilzen: Belgium (Keen 1978, op. cit.).

Chattian: Astrup near Osnabriick: Germany (Lienenklaus 1894, Stephenson 1936, op. cit.);
Hollkopf near Glimmerode, Kassel Basin: Germany (Faupel 1975, op. cit.); Shaft Rossenray,
Lower Rhine Basin: Germany (van den Bold 1963); Shaft Kapellen, Lower Rhine Basin: Germany
(Ellermann 1958); Niedersachsen (borings): Germany (Uffenorde 1980, 1981, op. cit.); Shaft
Tonisberg, Lower Rhine Basin: Germany (Weiss 1938b, op. cit.).

Egerian: Muzla (boring): Czechoslovakia (Brestenska 1975).

Acknowledgement: Thanks are due to the Deutsche Forschungsgemeinschaft for providing the Cambridge Stereoscan

180.

Explanation of Plate 11, 52

Fig. l,d'LV, int. lat. (GIK 932-1736; 913 /xm long); fig. 2, incomplete 9RV, int. lat. (GIK 932-1728; 863 /xm long). Length includes
marginal spines.

Scale A (100 /xm; x 104), figs. 1, 2.

Stereo-Atlas of Ostracod Shells 11 (11) 53-58 (1984) Paracytheridea cuneiformis (1 of 6)

595.337.14 (119.9) (411 : 162.005.57 + 411 : 162.006.55 + 420 : 162.007.49) : 551.351

ON PARACYTHERIDEA CUNEIFORMIS (BRADY)

by John Athersuch & David J. Horne
(B.P. Research Centre, Sunhury, & City of London Polytechnic)

Paracytheridea cuneiformis (Brady, 1868)

1866 Cythere ventricosa sp. nov. G. O. Sars, Forh. Vidensk Selsk. Krist., 1865, 34 ( non Cythere ventricosa Bosquet, 1852; non
Cythere (Bairdia) ventricosa Kirkby, 1858).

1868 Cythere cuneiformis nom. nov. G. S. Brady, Trans. Linn. Soc. Lond., 26, 404-405, pi. 31, figs. 47-54.

1874 Cythere cuneiformis Brady; G. S. Brady, H. W. Crosskey & D. Robertson, A monograph of the Post-Tertiary Entomostraca of

Scotland (including species from England and Ireland), Palaeontogr. Soc. Monogr., London, 154, pi. 10, figs. 23-26.

1925 Xenocythere cuneiformis (Brady); G. O. Sars, An account of the Crustacea of Norway, 9, Ostracoda, Bergen Museum, pts. 1 1-
12, 179-180, pi. 82.

Type specimens: The types are not listed in the Sars collection at the Zoological Museum, Oslo, and are therefore

presumed lost.

Type locality: S. Norway; Sars (1866, op. cit.) recorded two localities -Langesundsfjord (59° 00' N, 09°45' E) and

Drobak in Oslofjord (59°39'N, 10°48'E).

Figured specimens: Brit. Mus. (Nat. Hist.) nos. 1984. 116 (2 RV: PI. 11, 54, fig. 1; PI. 11, 56, fig. 4), 1984. 117(d'RV;

PI. 11, 54, fig. 2; copulatory appendage: Text-fig. 2), 1984. 118 (d'car.: PI. 11, 56, figs. 1-3).
Hancock Museum nos. 1. 54. 18 ( ?RV: PI. 11, 54, fig. 3; Text-fig. 3), 1. 54. 19(9LV + appendages:
Text-fig. 1). BM(NH) nos. 1984. 116 -118, all from unregistered slides in the BM(NH), are from
the Bay of Nigg, Scotland (57°41'N, 04°05' W) and were collected by T. Scott. The Hancock
Museum specimens were taken from faunal slides in the G. S. Brady collection; 1. 54. 18 is from
Loch Ryan, Scotland (55° 00' N, 05° 02' W) (ex slide no. 2. 12.36), 1. 54. 19 is from New Grimsby,
Isles of Scilly (49° 55' N, 06° 15' W) (ex slide no. 2.12.37).

Explanation of Plate 11, 54

Fig. 1, ?RV ext. lat. (1984. 116, 660 jum long); fig. 2,d'RV ext. lat. (1984. 117, 560 ^.m long); fig. 3,?RV int. lat. (1. 54. 18, 680 /xm
long). Scale A (100 jiim; x 100), figs. 1-3.

Stereo- Atlas of Ostracod Shells 11, 55 Paracytheridea cuneiformis (3 of 6)

Diagnosis: A species of Paracytheridea with very subdued ornament, the alar expansions being reduced to

inconspicuous swellings. The most prominent ornamental features are two ribs, the first running
obliquely from the eye-spot to the antero-ventral margin where it forms an acute angle with the
second which runs sub-marginally back to the anterior of the two alar swellings.

Remarks: A careful comparison of P. cuneiformis (type-species of Xenocythere Sars, 1925) with Muller’s

original description and illustrations of the type-species of Paracytheridea ( P.depressa G. W. Muller,
1894) shows that the two are almost indistinguishable except by the differential development of
their carapace ornament. The appendages of the two species are virtually identical, including
antennulae with five articulated podomeres and antennae with two terminal setae, one long and
chelate, the other slender and reduced. Both species have an antimerodont/weak entomodont hinge,
and there are close similarities in their carapace shape and basic pattern of ornament. Although the
reduced ornament of P .cuneiformis clearly separates it from strongly alate Mediterranean species of
Paracytheridea, intermediate forms have been described from elsewhere; see for example, P.cronini
Hazel, 1983 and P.mucra Edwards, 1944, both illustrated by Hazel ( Smithsonian Contributions to
Paleobiology , no. 53, pi. 28, figs. 1-2, pi. 29, figs. 1-2, 1983). We therefore conclude that Xeno-
cythere is a junior synonym of Paracytheridea.

We have been unable to trace the references to Reuss and Speyer by Brady (1868, op. cit.)
and Sars (1925, op. cit.) respectively as having previously assigned the name Cythere ventricosa to
other ostracod species. Nevertheless the two earlier uses of this name by Bosquet and Kirkby cited in
the synonymy herein clearly demonstrate that the name C. ventricosa Sars, 1866 is preoccupied.

Distribution: Recent: marine, sublittoral (to depths of around 20 m), rarely littoral; coasts of Scandinavia, British

Isles and N W Europe.

Pleistocene: British Isles.

Explanation of Plate 11, 56

Figs. 1-3, d'car. ( 1984. 118, 600 /Am long): fig. l,vent.;fig. 2, dors.; fig. 3, detail of RV dors, showing normal pores; fig. 4, 2 RV (1984.
116), detail of normal pore. Scale A (100 /on; x 100), figs. 1-2; scale B (10 /im; x 1400), fig. 3; scale C (10/u.m; x 1900), fig. 4.

Paracytheridea cuneiformis (2 of 6)

Stereo- Atlas of Ostracod Shells 1 1, 54

Paracytheridea cuneiformis (4 of 6)

Stereo-Atlas of Ostracod Shells 11, 56

Stereo- Atlas of Ostracod Shells 11, 57

Paracytheridea cuneiformis (5 of 6)

Text-fig. 1, $LV + appendages, 1. 54. 19; a: LV drawn in transmitted light; b: antennula; c: antenna; d: mandible; e: mandible palp;
f: maxillula; g-j: first, second and third legs.

Paracytheridea cuneiformis (6 of 6)

#

25£tm

Text-fig. 3, muscle scars, ?RV, 1. 54. 19.

Stereo- Atlas of Ostracod Shells 11, 58

Stereo-Atlas of Ostracod Shells, 11 (12) 59-62 (1984)
595.337.14 (119.9) (595 : 161.118.04) : 551.351

ON ATJEHELLA KING MAI KEIJ

by Manzoor Hasan
(University of Leicester, England)

Atjehella kingmai Keij, 1979

Atjehella kingmai (1 of 4)

1979 Atjehella kingmai sp. nov. A. J. Keij, Proc. K. ned. Akad. Wet., Ser. B, 82 (4), 458, pi. 2, figs. 1-14.

Holotype:

Type locality:
Figured specimens:

Diagnosis:

(not figured herein). Geological Institute of the State University of Utrecht, the Netherlands, coll,
no. T 333; 9LV.

South China Sea at 3°57'N, 1 13° 02' 30" E (sample Ms 7200); Recent; depth 35 m.

Brit. Mus. (Nat. Hist.) nos. OS 10148 (c/RV: PI. 11, 60, fig. 1; PI. 11, 62, figs. 1-3), OS 10149
(i?RV: PI. 11, 60, fig. 2; OS 10150 (d'LV: PI. 11, 60, fig. 3), OS 10152 (d-RV: Text-fig. 1). All from
Darvel Bay, Malaysia, coll. HMS Dampier. OS 10148, OS 10149 and OS 10150 are from lat.
04°55.1'N, long. 118°25.5'E; coll. 1962; depth 14 fathoms (26m). OS 10152 is from lat.
04° 40. 2' N, long. 118°44.0'E; coll. 1965; depth 40 fathoms (73 m).

Species of Atjehella with well-developed reticulation of the shell surface spreading from median to
mid-dorsal region. Three peripheral ridges in anterior region. Sieve-plates sparsely scattered over
shell surface.

Explanation of Plate 11, 60

Fig. l,cfRV, ext. lat. (OS 10148, 512 /am long); fig. 2,9 RV, ext. lat. (OS 10149, 480 /am long); fig. 3, d'LV, ext. lat. (OS 10150, 439/mi
long).

Scale A (150 /am; x 131), fig. 1; scale B (150/Am; x 135), fig. 2; scale C (150/am; x 143), fig. 3.

Stereo- Atlas of Ostracod Shells 11, 61 Atjehella kingmai (3 of 4)

Remarks: So far in the literature the presence of sieve-plates in Atjehella has not been mentioned, but they do

exist and are especially prominent in some specimens of A. kingmai from Darvel Bay. These sieve-
plates are generally sunk below the surface level of the shell and have central openings. Keij (op. cit.,
1979) has mentioned “Within Atjehella kingmai n.sp. we observed Indonesian populations along

the East coast of Kalimantan which possess a more pronounced intercarinal ornamentation

than normally found in the South China Sea”. In the present material specimens both with and
without pronounced intercarinal ornamentation have been observed.

Distribution: Known from the Recent of South China Sea, beach of Seria in Brunei, beach of Dent Peninsula, Java

Sea, harbour of Merak in West Java, Balikpapan Bay and Darvel Bay (herein).

Explanation of Plate 1 1, 62

Figs. l-S^RV (OS 10148, 512 /am long): fig. 1, int. lat.; fig. 2, ext. lat., detail of median region showing reticulation and sieve-plates;

fig. 3, ext. lat., sieve-plate in posteromedian region.

Scale A (100 /am; x 191), fig. 1; scale B (50 /am; x 393), fig. 2; scale C (3 /am; x 6288), fig. 3.

Stereo- Atlas of Ostracod Shells 11, 60

Atjehella kingmai (2 of 4)

Stereo- Atlas of Ostracod Shells 11, 62

Atjehella kingmai (4 of 4)

Stereo- Atlas of Ostracod Shells 11 (13) 63-66 (1984)
595.337.3 (119.9) (595 : 161.118.04) : 551.351

Cytherelloidea bonanzaensis (1 of 4)

ON CYTHERELLOIDEA BONANZAENSIS KEIJ

by Manzoor Hasan
(University of Leicester, England)

Cytherelloidea bonanzaensis Keij, 1964

1964 Cytherelloidea bonanzaensis sp. nov. A. J. Keij, Micropaleontology , 10, (4), 418, pi. 1, figs. 9-11.

Holotype: (not figured herein). Geological Institute of the State University of Utrecht, the Netherlands, coll,

no. S 15960, 9RV.

Type locality: Near the western end of Big Bonanza Shoal, Sabah, South China Sea; lat. 07c05' 10" N, long.

116° 17' 58" E; Recent; depth 67 m.

Figured specimens: Brit. Mus. (Nat. Hist.) nos. OS 10142 (d'LV: PI. 11, 64, fig. 1), OS 10143(9 RV: PI. 11, 64, fig. 2),

OS 10144(d'LV: PI. 11, 64, fig. 3; PI. 11, 66, figs. 1-3). All from Darvel Bay, Malaysia; Recent; coll,
by HMS Dampier in 1965. OS 10142 is from lat. 04° 39.2' N, long. 1 18° 40.5' E; depth 34 fathoms
(62 m). OS 10143 and OS 10144 are from lat. 04° 40.2' N, long. 1 18° 40.5' E; depth 40 fathoms
(73 m).

Explanation of Plate 1 1, 64

Fig. l,d'LV, ext. lat. (OS 10142, 414//.m long); fig. 2,9RV, ext. lat. (OS 10143, 341 pm long); fig. 3, d'LV, ext. lat. (OS 10144, 390 /i.m
long).

Scale A (100|um;x 157), fig. 1; scale B (lOO^mjx 199), fig. 2; scale C (100/mi;x 159), fig. 3.

Stereo-Atlas of Ostracod Shells 11, 65 Cytherelloidea bonanzaensis (3 of 4)

Species of Cytherelloidea with a distinctive ornament consisting of circular fossae connected by a
reticulate pattern of low muri which is less prominent in the median and dorsomedian regions. The
sola between the muri are foveolate. Scattered conjunctive normal pores present. Muscle-scar area
forms a well-marked depression on the external surface of the valve.

The surface ornamentation of C. bonanzaensis Keij is unique among Cytherelloidea species.
Recent, marine: off Sabah and Brunei in South China Sea (Keij, 1964); Darvel Bay, Malaysia
(herein).

Explanation of Plate 1 1, 66

Figs. 1-3, d'LV, ext. lat. (OS 10144): fig. 1, ant. dors, region showing fossae and reticulation; fig. 2, detail of circular fossa from fig. 1;

fig. 3, detail of external depression in muscle-scar region.

Scale A (20 x 731), fig. 1; scale B (5/^m; x 2862), fig. 2; scale C (50ju.m; x 358), fig. 3.

Diagnosis:

Remarks:

Distribution:

Stereo-Atlas of Ostracod Shells 1 1, 64

Cytherelloidea bonanzaensis (2 of 4)

Stereo-Atlas of Ostracod Shells 1 1, 66

Cytherelloidea bonanzaensis (4 of 4)

Stereo-Atlas of Ostracod Shells 11 (14) 67-70 (1984) Ogmoconcha eocontractula (1 of 4)

595.337.21 (116.212) (420: 161.001.52) : 551.351 + 552.52

ON OGMOCONCHA EOCONTRACTULA PARK sp. nov.

by Se-Moon Park
(University College London)

Holotype:
Type locality:

Derivation of name:
Figured specimens:

Diagnosis:

Remarks:

Ogmoconcha eocontractula sp. nov.

British Geological Survey MPK 4134, carapace.

[Paratypes: BGS MPK 4135 - BGS MPK 4137],

528.00 m-528. 50 m depth below surface, Trunch Borehole, Norfolk, England; lat. 52°50'N,
long. 1° 23' E. National Grid Reference: TG 2937 3450. Mudstone, medium brownish grey; Lower
Pliensbachian, Jurassic.

From the Greek eos, early; with reference to the species O. contractula.

British Geological Survey nos. MPK 4134 (holotype, car.: PI. 11, 68, fig. 2; PI. 11, 70, fig. 1), MPK
4135 (LV: PI. 11, 68, fig. 1), MPK 4136 (RV: PI. 11, 70, fig. 4), MPK 4137 (LV: PI. 1 1, 70, figs. 2, 3).
All material from the Trunch Borehole, Norfolk, England (see type locality).

A species of Ogmoconcha similar to O. contractula Triebel but distinguished by its larger size and a
more elongate, triangular lateral outline in which the position of greatest height is distinctly anterior
of mid-length; ventral margin of left valve broadly convex in outline.

Specific differentiation within Ogmoconcha and the allied Ogmoconchella is difficult, but comparison
of the present material with the type specimens of O. contractula Triebel ( Senckenbergiana , 23, 378,
1941) in the Senckenberg Museum, Frankfurt, demonstrates that two species are present. O.
eocontractula is larger (adults 0.840-0.910 mm long, 0.560-0.630 mm high) than O. contractula
(0.800-0.840 mm long; holotype = X/E1249). The former differs markedly in lateral shape of each
valve, as indicated in the diagnosis, and the two species also differ in range.

Explanation of Plate 11, 68

Fig. 1, LV, ext. lat. (MPK 4135, 880 gm long); fig. 2, car., ext. rt. lat. (holotype, MPK 4134, 910/Am long).
Scale A (200 /urn; x 69), fig. 1; scale B (200 /Am; x 66), fig. 2.

Stereo- Atlas of Ostracod Shells 11, 69

Ogmoconcha eocontractula (3 of 4)

Remarks (contd.):

Distribution:

Acknowledgements:

Triebel recorded O. contractula from Lias delta (Upper Pliensbachian) in the North German
Hambiihren WA-2 boring at depths of 495-503 m. Specimens identical with O. eocontractula,
deposited in the Senckenberg Museum, Frankfurt, occur in Hambiihren WA-2 at depths of 509-
607 m. O. eocontractula is apparently an ancestor of O. contractula.

O. eocontractula resembles Ogmoconcha amalthei (Quenstedt ,Der Jura, Tubingen, 1858) in
outline, but when compared with the material deposited in the Senckenberg Museum, Frankfurt,
they differ in several respects. The latter is highly arched antero-dorsally, whereas the former is
somewhat rounded dorsally. The surface of O. eocontractula is punctate, whereas that otO. amalthei
is smooth, and there is a swollen ventral rim (ventral depression) inO. amalthei which is absent inO.
eocontractula .

O. eocontractula is also comparable with Ogmoconcha '’‘‘amalthei form A” of Michelsen
(Geol. Surv. Denmark, 104, 228, 1975) from Denmark, deposited in the Geological Survey of
Denmark, Copenhagen (DGU-1973-OM-26). There are fine punctae on the surface in both species,
but the posterior margin of the latter is distinctly elongate. Michelsen’s species is closely allied to
O. eocontractula and may be a different subspecies. Michelsen recorded O. “ amalthei form A” from
the Lower Pliensbachian, where O. eocontractula also occurs. No O. eocontractula s.s. have been
recognised in Michelsen’s Danish material.

108 carapaces and 323 valves, adults and instars, from the Trunch Borehole (563.50 m-525. 50 m)
England; the De Lutte boring No. 3 (260 m-198 m) and the Oldenzaal boring No. 1 (427 m-333 m),
The Netherlands; Hambiihren WA-2 boring (509m-607 m depth), German Federal Republic; all
levels are Lower Pliensbachian, Jurassic.

The Director of the British Geological Survey (BGS) has approved the use of BGS material in this
work. The assistance of Dr. H. Malz and Dr. O. Michelsen is gratefully acknowledged. The Univer-
sity of London Central Research Fund generously provided travelling expenses.

Explanation of Plate 11, 70

Fig. 1, car., ext. dors, (holotype, MPK 4134, 910/im long); fig. 2, LV, hinge detail (MPK 4137, 910/Am long); fig. 3, LV, int. lat. (MPK
4137, 910 /Am long); fig. 4, RV, ext. lat. (MPK 4136, 840 /Am long).

Scale A (200 /Am; x 57), fig. 1; scale B (200 /Am; x 73), fig. 2; scale C (200 /Am; x 57), fig. 3; scale D (200 /Am; x 71), fig. 4.

Stereo-Atlas of Ostracod Shells 11 (15) 71-74 (1984)
595.337.14 (116.331) (44 : 162.002.44) : 551.351 + 552.52

Donmacythere damottae (1 of 4)

ON DONMACYTHERE DAMOTTAE (COLIN)

by J. P. Colin

(Esso Production Research-European Laboratory, Begles, France)

Genus DONMACYTHERE Griindel, 1976
Type-species: Hazelinal damottae Colin, 1974

Diagnosis: General outline and sculpture similar to the genus Mandocythere Griindel, 1964. Surface of valves

smooth. Well developed median ridge, obliquely oriented, not connected with the dorsal ridge.
Anterior marginal and ventral ridge in continuity. Hinge amphidont. Marginal zones moderately
wide (Vio of length), without vestibulum. More than 35 anterior marginal pore canals, sinuous and
thickened in their median part. Sexual dimorphism well marked, with males more elongated.

Remarks: This genus was originally described as a subgenus of Mandocythere by Griindel, 1976. Veenia
inferangulata Donze, 1972 (Rev. esp. Micropaleontol., 4, 368, pi. 2, figs. 3-9), from the Cenomanian
of the Southern Alps (SE France), was also placed in this genus by Griindel. Weaver (Palaeontogr.
Soc. Monogr., 135, 51, 1982) doubts this assignation on the basis of the observation of “variably
crenulate hinge teeth”.

Explanation of Plate 11, 72

Fig. 1, ?RV, ext. lat. (14139-40, 765 /xm long); fig. 2, dLV, ext. lat. ( 14141-42, 800 /xm long); fig. 3, 9 LV, ext. lat. (14143-44, 740 /xm
long).

Scale A (200 /xm; x 81), figs. 1, 3; scale B (200 /xm; x 68), fig. 2.

Stereo-Atlas of Ostracod Shells 11, 73

Donmacythere damottae (Colin, 1974)

Donmacythere damottae (3 of 4)

1974 Hazelinal damottae n. sp. J. P. Colin, Geobios, 7, 26-27, pi. 8, figs. 9-12.

1976 Mandocythere (Donmacythere) damottae (Colin); J. Griindel, Z. geol. Wiss. Berlin, 4, 1297.

1980 Hazelina damottae Colin; J. F. Babinot, Trav. Lab. Geol. Hist. Univ., Provence, 10, 136, pi. 20, figs. 11-13.

Holotype:
Type-locality:
Figured specimens:

Diagnosis:

Distribution:

Unnumbered left valve, deposited in the collections of the Laboratoire de Micropaleontologie,
Universite Pierre et Marie Curie, Paris.

Le Fournet, village of Berbiguieres, near St Cyprien, Dordogne, S W France: approx, lat. 44° 50' N,
long. 1°03' W. Late Cenomanian, Cretaceous.

Esso Production Research-European Laboratory nos. EPR-E 14135-36 ( 9 car.: PI. 11, 74, fig. 2),
14137- 38 (dear.: PI. 11, 74, fig. 3) 14139-40 (9RV: PI. 11, 72, fig. 1), 14141-42 (dLV: PI. 11,72,
fig. 2), 14143-44 ( 9LV: PI. 11, 72, fig. 3), 114145-46 ( dLV: PI. 11, 74, fig. 1).

All the specimens are from the late Cenomanian of the type-locality: marls with very rich
ostracod faunas and foraminifera (Thomasinella punica, Daxia cenomana).

As for the genus.

Late Cenomanian of SW and SE France and Spain.

Explanation of Plate 11, 74

Fig. 1, dLV, int. lat. (14145-46, 830/xm long); fig. 2, 9car., ext. dors. (14135-36, 740 /xm long);fig. 3, .dear., ext. dors. (14137-38,
785 /xm long).

Scale A (200 /xm; x 68), figs. 1, 3; scale B (200 /xm; X 81), fig. 2.

Stereo-Atlas of Ostracod Shells 11, 72

Donmacythere damottae (2 of 4)

Stereo-Atlas of Ostracod Shells 11, 74

Donmacythere damottae (4 of 4)

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Stereo-Atlas of Ostracod Shells: Vol. 11, Part 1

CONTENTS

11(1) 1-4
11(2) 5-8

11(3) 9-12
11(4) 13-16
11(5) 17-20
11(6) 21-24

11(7) 25-28

11(8) 29-36
11(9) 37-44
11 (10) 45-52
11 (11) 53-58
11 (12) 59-62
11(13) 63-66
11(14) 67-70
11(15) 71-74

On Hippula (Cetona) turns (Schallreuter) ; by R. E. L. Schallreuter
On Schallreuteria (Lippea) lippensis Schallreuter subgen. et sp. nov.; by
R. E. L. Schallreuter

On Duringia spinosa (Kniipfer); by R. E. L. Schallreuter
On Duringia triformosa Jones sp. nov. ; by C. R. Jones
On Hamanella implexa Finger; by K. L. Finger

On Sagmatocythere paracercinata Whatley & Maybury sp. nov.; by R. C.
Whatley & C. Maybury

On Sagmatocythere pseudomultifora Maybury & Whatley sp. nov.; by
C. Maybury & R. C. Whatley

On Cytheridea (Cytheridea) muelleri muelleri (v. Munster); by R. H. Weiss
On Cytheridea (Cytheridea) muelleri toenisbergensis Weiss; by R. H. Weiss
On Cytheridea (Cytheridea) pernota Oertli & Keij; by R. H. Weiss
On Paracytheridea cuneiformis (Brady); by J. Athersuch & D. J. Horne
On Atjehalla kingmai Keij; by M. Hasan
On Cytherelloidea bonanzaensis Keij; by M. Hasan
On Ogmoconcha eocontractula Park sp. nov.; by Se-Moon Park
On Donmacythere damottae (Colin); J. P. Colin

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