Bairdiacypris sp. 3

Fig. 6S

Material examined

ROMANIA • 1 RV; Black Sea, Romanian Continental Shelf, borehole 817LV, sample CM31B; Rhaetian, Upper Triassic; MNHN.F. F63212 • 1 complete carapace; same collection data as for preceding; Rhaetian, Upper Triassic; MNHN.F. F63344 .

Dimensions

L = 1060 µm; H = 481 µm; H/L = 0.45.

Occurrence

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

Remarks

Bairdiacypris sp. 3 is close to Fabalicypris n. sp. in Kristan-Tollmann et al. 1980 from the Rhaetian of Iran (Kristan-Tollmann et al. 1980), but the present species has a tripartite dorsal margin at RV

with longer DB and lacks the Fabalicypris offset of the ventral overlap. Bairdiacypris sp. 3 is also close to Bairdiacypris ? sp. 2 in Lord & Lambourne 1991 from the Pliensbachian, Early Jurassic, of Turkey (Lord & Lambourne 1991), from which it differs in being larger with a less elongate posterior end. Bairdiacypris sp. 3 shares a strong similarity with Bairdiacypris sp. B in Bolz 1971 from the Rhaetian interval of the Northern Calcareous Alps (Bolz 1971b), which is only shown as inner views. However, Bairdiacypris sp. 3 has a shorter DB and a larger PB with maximum of convexity located higher. Bairdiacypris sp. 3 is also larger than Bairdiacypris sp. B in Bolz 1971 (L = 690–950 µm; H = 320–500 µm; H/L = 0.44–0.55), with a similar H/L ratio; this characteristic could relate to ontogeny. It is nevertheless worth noting that the H/L ratio of Bairdiacypris sp. B in Bolz 1971 mainly ranges from 0.44 to 0.48 (Bolz 1971b: 231). The dimensions provided for the specimen illustrated in Bolz (1971b: pl 8, fig. 104) are L = 900 µm and H = 500 µm, leading to an H/L ratio of 0.55.