Cytheruridae, G.W.Mueller, 1894

Forel, Marie-Béatrice & Grădinaru, Eugen, 2020, Rhaetian (Late Triassic) ostracods (Crustacea, Ostracoda) from the offshore prolongation of the North Dobrogean Orogen into the Romanian Black Sea shelf, European Journal of Taxonomy 727, pp. 1-83 : 54-55

Cytheruridae gen. et sp. indet.

Fig. 11 N–P

Material examined

ROMANIA • 1 complete carapace; Black Sea, Romanian Continental Shelf, borehole 817LV, sample CM31C; Rhaetian, Upper Triassic; MNHN.F. F63293 • 1 complete carapace; same collection data as for preceding; Rhaetian, Upper Triassic; MNHN.F. F63294 • 1 complete carapace; same collection data as for preceding; Rhaetian, Upper Triassic; MNHN.F. F63295 • 1 complete carapace; same locality as for preceding but sample CM31B; Rhaetian, Upper Triassic; MNHN.F. F63361 .

Dimensions

RV: L = 256–319 µm; H = 170–197 µm; H/L = 0.6–0.63.

LV: L = 271–301 µm; H = 145–172 µm; H/L = 0.57.

Occurrence

Romanian Continental Shelf, Black Sea, Rhaetian, Upper Triassic (this paper).

Remarks

These very small specimens are characterized by a strong overlap of LV around the free margin of RV, lateral surface of both valves entirely tuberculate, lack of marginal compression, and a lack of caudal process, sulcus or lateral extensions. They may correspond to a new genus but the material is still too scant to confirm this hypothesis and fully appreciate the diagnostic characters of this possibly new genus.

Figures

Fig. 11 (opposite page). SEM micrographs of ostracods from borehole 817 Lebăda Vest, drill core CM31, western portion of Black Sea shelf, Rhaetian, Late Triassic. All specimens are housed in the collections of the Muséum national d’histoire naturelle, Paris, France (MNHN). A. Paracypris sp. 3, right lateral view of a carapace, sample CM31A (MNHN.F.F63281). B–G. Pseudomacrocypris? kerabani Forel sp. nov. B. Paratype, right lateral view of a carapace, sample CM31C (MNHN.F.F63282). C. Holotype, right lateral view of a carapace, sample CM31C (MNHN.F.F63283). D. Right lateral view of a carapace, sample CM31C (MNHN.F.F63284). E. Left lateral view of a carapace, sample CM31C (MNHN.F.F63285). F. Right lateral view of a carapace, sample CM31B (MNHN.F.F63286). G. Right lateral view of a carapace, sample CM31C (MNHN.F.F63287). H. Pseudomacrocypris? sp., left lateral view of a carapace, sample CM31B (MNHN.F.F63288). I–J. Praebythoceratina sp. I. Right lateral view of a carapace, sample CM31B (MNHN.F.F63289). J. Same specimen, dorsal view.K. Triassocythere sp., external view of a left valve, sample CM31C (MNHN.F.F63290). L–M. Judahella andrusovi Kozur & Bolz in Bunza & Kozur, 1971. L. Right lateral view of a carapace, sample CM31C (MNHN.F.F63291). M. External view of a right valve, sample CM31A (MNHN.F.F63292). N–P. Cytheruridae gen. et sp. indet. N. Right lateral view of a carapace, sample CM31C (MNHN.F.F63293). O. Right lateral view of a carapace, sample CM31C (MNHN.F.F63294). P. Right lateral view of a carapace, sample CM31C (MNHN.F.F63295). Q. Praemacrocypris sp., external view of a right valve, sample CM31B (MNHN.F.F63296). R–S. Cardobairdia sp. 1. R. Right lateral view of a carapace, sample CM31B (MNHN.F.F63297). S. Right lateral view of a carapace, sample CM31A (MNHN.F.F63298). T–U. Cardobairdia sp. 2. T. Right lateral view of a carapace, sample CM31A (MNHN.F.F63299). U. Right lateral view of a carapace, sample CM31B (MNHN.F.F63300). Scale bars: 100 µm.