Carinobairdia alpina Kollmann, 1963 emend. 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 : 26-28

Carinobairdia alpina Kollmann, 1963 emend. Kristan-Tollmann 1970

Fig. 7 C–F

Carinobairdia alpina Kollmann, 1963: 194–195 , pl. 3, figs 3–4, pl. 11, figs 9–12.

Carinobairdia alta Kollmann, 1963: 195 , pl. 11, figs 2–4.

Carinobairdia tenuicarinata Kollmann, 1963: 196 , pl. 11, figs 5–8.

Carinobairdia alpina – Kristan-Tollmann 1964: 71, pl. 3, fig. 8; 1970: 297, pl. 5, figs 5–7; 1988: fig. 6/5. — Bolz 1971a: pl. 2, fig. 6. — Kristan-Tollmann et al. 1979: 150, pl. 6, fig. 5; 1980: 183–184, pl. 7, figs 7–10.

Triebelina (Nodobairdia) alpina – Bolz 1971b: 218–221, pl. 16, figs 233–243. — Urlichs 1972: 676, pl. 1, fig. 2.

Nodobyirdia alpina [sic] – Mette & Mohtat-Aghai 1999: pl. 5, fig. 5.

Nodobairdia alpina – Urlichs & Krystyn 2016: 20. — Hillebrandt et al. 2013: 175.

Material examined

ROMANIA • 1 RV; Black Sea , Romanian Continental Shelf , borehole 817LV, sample CM31C; Rhaetian, Upper Triassic; MNHN.F. F63217 • 1 broken LV; same locality as for preceding but sample CM31B; Rhaetian, Upper Triassic; MNHN.F. F63218 • 1 LV; same collection data as for preceding; Rhaetian, Upper Triassic; MNHN.F. F63219 .

Dimensions

See Fig. 3C .

Occurrence

Zlambach Formation, Backhaus Member, Elisabeth Member, Josef Member, Gr̹nbachgraben and Mergel, Dolomitenhütte and Plackles, Austria, Rhaetian, Upper Triassic ( Kollmann 1963); K̂ssen Formation, Northern Calcareous Alps, Tyrol, Austria, Rhaetian, Upper Triassic ( Kristan-Tollmann 1964; Mette & Mohtat-Aghai 1999); Zlambach Formation, Ĥllgraben, Krautgartenalm, Gr̹nbachgraben, Austria, Rhaetian, Upper Triassic ( Kristan-Tollmann 1969, 1970); Zlambach Formation, Fischerwiese, Aussee, Salzkammergut, Austria, Rhaetian, Upper Triassic (Kristan-Tollman, 1970); Zlambach beds, Grünbachgraben, Northern Calcareous Alps, Rhaetian, Upper Triassic ( Bolz 1971a, 1971b); K̂ssen Formation, Weissloferbach, Kössen, Austria, Rhaetian, Upper Triassic ( Urlichs 1972); K̂ssen Formation, Eiberg section, Northern Calcareous Alps, Rhaetian, Upper Triassic ( Mette et al. 2012; Hillebrandt et al. 2013); Steinbergkogel, Austria, uppermost Hallstatt Limestone Formation and lowermost Zlambach Formation, Paracochloceras suessi Zone , Vandaites stuerzenbaumi Zone , Choristoceras marshi Zone, Early Rhaetian , Upper Triassic ( Urlichs & Krystyn 2016); Waliabad, Abadeh, Iran, Rhaetian, Upper Triassic ( Kristan-Tollmann et al. 1979); Nayband Formation, Wali-Abad, Iran, Rhaetian, Upper Triassic ( Kristan-Tollmann et al. 1980; Kristan-Tollmann 1988); Romanian Continental Shelf, Black Sea, Rhaetian, Upper Triassic (this paper).

Remarks

This species was alternatively attributed to Triebelina (Nodobairdia) by Bolz (1971b) and to the newly erected Bolzibairdia by Kozur (1985). As discussed for Carinobairdia triassica triassica , we follow the original generic scheme introduced by Kollmann (1960, 1963). However, we follow Bolz (1971a, 1971b) in considering that C. alta Kollmann, 1963 (erected on LV only) and C. tenuicarinata Kollmann, 1963 (considered as juveniles) are synonyms of C. alpina Kollmann, 1963 . Carinobairdia alpina is typical for the Rhaetian, Late Triassic, of western Tethys and Iran as shown by the occurrences list.

The height and length of all specimens of Carinobairdia alpina are plotted in Fig. 3C , which document their distribution in five ontogenetic stages from A-4 to adult. The only carapace known for this species, from the Rhaetian of Iran ( Kristan-Tollmann et al. 1980), documents an already important overlap of LV on RV in the A-2. The smallest known specimen is an RV obtained from sample CM31C of the present paper (L = 535 µm; H = 292 µm; H/L = 0.55). The smallest LV is recorded from the Rhaetian of the Northern Calcareous Alps ( Bolz 1971b: L = 590 µm; H = 370 µm; H/L = 0.63). The Black Sea specimens are small compared to other records and represent immature stages.

Figures

Fig. 7 (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–B. Carinobairdia triassica triassica Kollmann, 1963. A. External view of a right valve, sample CM31B (MNHN.F.F63215). B. External view of a right valve, sample CM31C (MNHN.F.F63216). C–F. Carinobairdia alpina Kollmann, 1963 emend. Kristan-Tollmann 1970. C. External view of a right valve, sample CM31C (MNHN.F.F63217). D. External view of a broken left valve, sample CM31B (MNHN.F.F63218). E. External view of a left valve, sample CM31B (MNHN.F.F63219). F. Same specimen, inner view. G–S. Ceratobairdia? akhilleusi Forel sp. nov. G. External view of a left valve, sample CM31C (MNHN.F.F63220). H. Paratype 2, right lateral view of a carapace, sample CM31A (MNHN.F.F63221). I. Same specimen, dorsal view. J. Paratype 1, right lateral view of a carapace, sample CM31C (MNHN.F.F63222). K. Same specimen, dorsal view. L. External view of a right valve, sample CM31A (MNHN.F.F63223). M. Holotype, external view of a left valve, sample CM31B (MNHN.F.F63224). N. Same specimen, inner view. O. Detail of the muscle scar field area (topography mode). P. Detail of the posterior end of hingement. Q. Detail of the anterior end of hingement. R. External view of a left valve, sample CM31A (MNHN.F.F63225). S. Same specimen, inner view. T. Ceratobairdia sp., external view of a broken left valve, sample CM31A (MNHN.F.F63226). U. Fabalicypris cf. triassica Bolz, 1971, right lateral view of a carapace, sample CM31A (MNHN.F.F63227). Scale bars: 100 µm.

Fig. 3. Height/length scatter plots of species from borehole 817 Lebăda Vest, drill core CM31, western portion of Black Sea shelf, Rhaetian, Late Triassic. In all diagrams, the dimensions of right (stars) and left (circles) valves of complete carapaces are shown separately and circled or linked. P1 = paratype 1; P2 = paratype 2. A. Bairdiacypris multidentata Bolz, 1971. B. Bairdiacypris argonautaii Forel sp. nov. C. Carinobairdia alpina Kollmann, 1963. D. Ceratobairdia? akhilleusi Forel sp. nov. E. Histriabairdia pontuseuxinusensis Forel gen. et sp. nov. F. Isobythocypris atalantella Forel sp. nov. G. Petasobairdia amazonella Forel sp. nov. H. Paracypris ovidi Forel sp. nov.