. Bulletin des British Museum (Natural History), Geologie. . 0125 mm Abb. I4 a-C. Galliaecytheridea manyuliensis sp. nov. pore Kanäle, männliche linke Ventil, paratype Io. 6148. Panzers, paratype ich 0.6149. a. Anterior duplicature und Rn b, C. Rechts und dorsalen Ansichten, weibliche Höhe 0-43 mm; Breite von 0-24 mm. Ich 0.6150, männliche Panzers, Länge 0-78 mm; Höhe 0-42 mm; Breite 0-33 mm. Diskussion. Wie Galliaecytheridea hemimerodont diagnostiziert verfügt über ein Scharnier, das mediane Element glatt wird. In Galliaecytheridea manyuliensis sp. nov., jedoch das Scharnier antimerodont anteromedian Element ist, das die

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. Bulletin of the British Museum (Natural History), Geology. . 0125 mm Fig. i4a-c. Galliaecytheridea manyuliensis sp. nov. pore canals, male left valve, paratype Io. 6148. carapace, paratype I0.6149. a. Anterior duplicature and marginal b, c. Right and dorsal views, female height 0-43 mm ; width 0-24 mm. I0.6150, male carapace, length 0-78 mm ; height 0-42 mm ; width 0-33 mm. Discussion. Galliaecytheridea as diagnosed possesses a hemimerodont hinge, the median element being smooth. In Galliaecytheridea manyuliensis sp. nov., however, the hinge is antimerodont, the anteromedian element of which shows an increase in size of the teeth in the left valve and of the loculae in the right. Thus the hinge approaches the entomodont condition as described in Galliaecytheridea ? kings- cliffensis Bate 1967, from the Bathonian of England. G. manyuliensis in common with G. ? kingscliffensis thus possesses a hinge differing from that described in all other species of Galliaecytheridea, although both species have the other morphological characters of the genus. The introduction of a subgeneric unit at this stage does not, however, appear to be necessary. The lateral outline of the female dimorph is generally most useful in distinguishing between species of Galliaecytheridea and in this respect G. manyuliensis is easily separated from the more squat and robust G. ? kingscliffensis. G. remota Grekoff 1963, from the Callovian of Madagascar, differs in having a more pointed posterior end as well as a different hinge. G. manyuliensis sp. nov. derives its name from the Manyuli stream, Mandawa Anticline.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. British Museum (Natural History). London : BM(NH)

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