Hiatobairdia sp. 3, 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. 3

Fig. 8F

Material examined

ROMANIA • 1 complete carapace; Black Sea , Romanian Continental Shelf , borehole 817LV, sample CM31B; Rhaetian, Upper Triassic; MNHN.F. F63232 • 1 RV; same locality as for preceding but sample CM31C; Rhaetian, Upper Triassic; MNHN.F. F63350 .

Dimensions

RV: L = 1152 µm; H = 678 µm; H/L = 0.59.

LV: L = 1152 µm; H = 627 µm; H/L = 0.54.

Occurrence

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

Remarks

Hiatobairdia sp. 3 is very close to several species already known from the literature, but the conspecificity of our material with these species is impossible to ascertain because the RV of cthe omplete carapace is broken posteriorly. Hiatobairdia sp. 3 is relatively close to Hiatobairdia subsymmetrica KristanTollmann in Kristan-Tollmann et al., 1980 from the Rhaetian of Iran ( Kristan-Tollmann et al. 1980), but the presence of the diagnostic ridge underlying the ventral margin is not verifiable here and our specimens have a relatively shorter and larger AB, as well as a shorter and less pointed PB. The slight indentation visible at the PVB of the RV could relate Hiatobairdia sp. 3 to Hiatobairdia labrifera Kristan-Tollmann in Kristan-Tollmann et al., 1980 from the Rhaetian of Iran ( Kristan-Tollmann et al. 1980), but it is difficult to ascertain that the observed indentation is not related to preservation bias. For these reasons, and until additional material can be observed, the present species is kept in open nomenclature.

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.