Fabalicypris triassica, Kollmann, 1963

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 : 25-26

Carinobairdia triassica triassica Kollmann, 1963

Fig. 7 A–B

Carinobairdia triassica Kollmann, 1963: 191–192 , pl. 3, figs 5–9, pl. 11, fig. 1.

Carinobairdia triassica – Bolz 1969: 413, pl. 1, figs 1–6, pls 2–5. — Kristan-Tollmann 1969: 86, pl. 4. — Bolz 1971a: pl. 2, fig. 5. — Hillebrandt et al. 2007: fig. 14. — Zorn 2010: 273, pl. 5, figs 15–16, pl. 8, fig. 5.

Carinobairdia triassica triassica – Kristan-Tollmann 1970: 297, pl. 5, figs 1–2, pl. 35, fig. 6; 1988: fig. 6/4. — Kristan-Tollmann et al. 1980: 4–5, pl. 7, figs 1–6.

Lobobairdia triassica – Urlichs 1972: 229, pl. 1, fig. 3. — Mette & Mohtat-Aghai 1999: pl. 5, figs 6–7. — Hillebrandt et al. 2013: 176, pl. 5, figs 15–16, pl. 8, fig. 5.

Material examined

ROMANIA • 1 RV; Black Sea , Romanian Continental Shelf , borehole 817LV, sample CM31B; Rhaetian, Upper Triassic; MNHN.F. F63215 • 1 RV; same locality as for preceding but sample CM31C; Rhaetian, Upper Triassic; MNHN.F. F63216 • 1 RV, 2 LV; same locality as for preceding but samples CM31B and CM31C; Rhaetian, Upper Triassic; MNHN.F. F63346 .

Dimensions

RV (sample CM31C, Fig. 7B ): L = 703 µm; H = 390 µm; H/L = 0.55.

RV (sample CM31B, Fig. 7A ): L = 576 µm; H = 334 µm; H/L = 0.58.

Occurrence

Zlambach Formation, Plackleswiese, W Plackles, Hohe Wand, NW Wiener Neustadt, Lower Austria, Austria, Rhaetian, Upper Triassic ( Kollmann 1963; Zorn 2010); Zlambach Formation, Ĥllgraben, Krautgartenalm, Grünbachgraben, Austria, Rhaetian, Upper Triassic ( Bolz 1969, 1971a; KristanTollmann 1969, 1970); Kössen Formation, Weissloferbach, Kössen, Austria, Rhaetian, Upper Triassic ( Urlichs 1972); Kössen Formation, Northern Calcareous Alps, Tyrol, Austria, Rhaetian, Upper Triassic ( Mette & Mohtat-Aghai 1999); K̂ssen Formation, Eiberg Member, Kuhjoch, Karwendel Mountains, Northern Calcareous Alps, Tyrol, Austria, marshi Zone, Rhaetian , Upper Triassic ( Hillebrandt et al. 2007, 2013); Kössen, Austria, Rhaetian, Upper Triassic ( Urlichs 1972); Nayband Formation, WaliAbad, Iran, Rhaetian, Upper Triassic ( Kristan-Tollmann et al. 1980; Kristan-Tollmann 1988); Romanian Continental Shelf, Black Sea, Rhaetian, Upper Triassic (this paper).

Remarks

Opinions on the validity of the genus Carinobairdia and the species C. triassica have varied through time and among authors. The taxonomic scheme established by Kollmann (1963) was accepted and followed by Kristan-Tollmann (1969, 1970, 1988) and Kristan-Tollmann et al. (1979, 1980). Kristan-Tollmann (1970) additionally created the subspecies C. triassica interrupta from the Rhaetian of Austria, which led to the re-qualification of C. triassica as C. triassica triassica . The opinion of Bolz (1971a, 1971b) differed in drastic ways: he re-attributed C. triassica and C. umbonata to the genus Lobobairdia and furthermore considered Carinobairdia as a synonym of both Lobobairdia and Triebelina (Nodobairdia) . Conversely, Urlichs (1972) first followed the re-attributions of Bolz (1971a, 1971b), later came back to the original scheme by using the genus Carinobairdia (in Hillebrandt et al. 2007) and again used the Bolz (1971a, 1971b) scheme (in Hillebrandt et al. 2013). It is out of the scope of the present paper to discuss these schemes in detail: the above summary clearly shows the volatility of the positions adopted through time and the non-robustness of characters and discussions on their significance. The status of the generic classification of Bairdiidae is in need of a detailed and thorough analysis with phylogenetic tools and cladistics. Such an analysis is currently in progress. However, to stop complicating the taxonomic situation of sculptured Bairdiidae , we choose to go on using the original scheme until an analysis of the phylogeny of these ostracods and of the significance of ornamentation if performed.

Bolz (1969) measured and discussed more than 200 specimens of Carinobairdia triassica triassica Kollmann, 1963 . According to the H and L ranges provided in that paper, the RV found in the present investigation are juveniles: A-2 stage for the RV obtained from sample CM31C ( Fig. 7B ), A-3 from the valve obtained from sample CM31B ( Fig. 7A ).

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.