Hiatobairdia sp. 2, Kristan-Tollmann, 1970

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 : 31

Hiatobairdia sp. 2

Fig. 8 C–E

Material examined

ROMANIA • 1 complete carapace; Black Sea , Romanian Continental Shelf , borehole 817LV, sample CM31B; Rhaetian, Upper Triassic; MNHN.F. F63230 • 1 LV; same collection data as for preceding; Rhaetian, Upper Triassic; MNHN.F. F63231 • 2 LV; same collection data as for preceding; Rhaetian, Upper Triassic; MNHN.F. F63349 .

Dimensions

RV: L = 1068 µm; H = 644 µm; H/L = 0.6.

LV: L = 838–1068 µm; H = 520–695 µm; H/L = 0.62–0.63.

Occurrence

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

Remarks

Hiatobairdia sp. 2 is characterized by its very high and nearly symmetrical AB and PB, which clearly relates it to Hiatobairdia arcuata Kristan-Tollmann in Kristan-Tollmann et al., 1980 from the Rhaetian of Iran ( Kristan-Tollmann et al. 1980). However, Hiatobairdia sp. 2 is differentiated from it by having the lateral surface not overhanging the ventral margin, absence of postero-ventral thickening and less pronounced antero-dorsal and postero-dorsal concavities. Hiatobairdia sp. 2 is undeniably a new species, but we lack enough material to define its diagnostic characters.

Figures

Fig. 8 (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. Fabalicypris cf. triassica Bolz, 1971, external view of a left valve, sample CM31A (MNHN.F.F63228). B. Hiatobairdia sp. 1, right lateral view of a carapace, sample CM31B (MNHN.F.F63229). C–E. Hiatobairdia sp. 2. C. Right lateral view of a carapace, sample CM31B (MNHN.F.F63230). D. Same specimen, dorsal view. E. External view of a left valve, sample CM31B (MNHN.F.F63231). F. Hiatobairdia sp. 3, right lateral view of a carapace, sample CM31B (MNHN.F.F63232).G–O. Histriabairdia pontuseuxinusensis Forel gen. et sp. nov. G. External view of a left valve, sample CM31C (MNHN.F.F63233). H. Right lateral view of a complete carapace, sample CM31C (MNHN.F.F63234). I. External view of a right valve, sample CM31C (MNHN.F.F63235). J. Right lateral view of a complete carapace, sample CM31C (MNHN.F.F63236). K. External view of a left valve, sample CM31C (MNHN.F.F63237). L. Holotype, right lateral view of a complete carapace, sample CM31B (MNHN.F.F63238). M. Same specimen, dorsal view. N. Paratype, external view of a left valve, sample CM31B (MNHN.F.F63239). O. Same specimen, inner view. P–R. Histriabairdia gen nov. sp. 1. P. External view of a right valve, sample CM31C (MNHN.F.F63240). Q. Right lateral view of a complete carapace, sample CM31C (MNHN.F.F63241). R. Same specimen, dorsal view. S–U. Histriabairdia gen. nov. sp. 2. S. Right lateral view of a carapace broken anteriorly and posteriorly, sample CM31C (MNHN.F.F63242). T. Right lateral view of a carapace broken anteriorly and posteriorly, sample CM31C (MNHN.F.F63243). U. External view of a broken right valve, sample CM31C (MNHN.F.F63244). Scale bars: 100 µm.