Cassianella beyrichi Bittner, 1895

Hausmann, Imelda M., Nützel, Alexander, Roden, Vanessa Julie & Reich, Mike, 2021, Palaeoecology of tropical marine invertebrate assemblages from the Late Triassic of Misurina, Dolomites, Italy, Acta Palaeontologica Polonica 66 (1), pp. 143-192 : 174

Cassianella beyrichi Bittner, 1895

Fig. 27B, C .

pars 1838 Avicula gryphaeata Münst. ; Goldfuss 1838: 127, pl. 106:

10e (non fig. 10 a–d). pars 1841 Avicula gryphaeata ; Münster 1841: 75–76, pl. 7: 7a–c. pars 1865 Cassianella gryphaeata Münst. sp.; Laube 1865: 46–47, pl.

17: 1a–h. 1895 Cassianella Beyrichii nov. spec.; Bittner 1895: 54–55, pl. 6: 16–

21. 1977 Cassianella beyrichii ; Fürsich and Wendt 1977: 288, fig. 13.6. 1981 Cassianella beyrichi (Bittner) ; Zardini 1981: pl. 13: 3, 4.

Material.— Seven specimens, 1 from bulk samples, 6 from surface samples; 3 from Lago Antorno ( PZO 12861 , 12862 , 2 figured specimens; PZO 12860 , 1 specimen); 4 from Misurina Landslide ( PZO 12751 , 4 specimens); Italy, Carnian , Triassic .

Remarks.—Only the characteristic left valves are preserved. They were identified according to Zardini (1981). This Cassianella species, together with C. ampezzana Bittner, 1895 , belongs to the trophic nucleus of Fürsich and Wendt’s (1977) Ampullina association, which is very similar in taxonomic composition to the Misurina Landslide and Lago Antorno assemblages studied herein.

Stratigraphic and geographic range.—Carnian, Upper Triassic; northern Italy (Cassian Formation), Sicily, Apennines; Austria (northern Alps). Upper Triassic; China, Yunnan ( Diener 1923; Kutassy 1931; Paleobiology Database, https://paleobiodb.org).

Figures

Fig. 27. Cassianellid bivalves from Lago Antorno, northern Italy, Cassian Formation, Carnian, Upper Triassic. A. Cassianella spp., PZO 12886, in lateral view (A1); A2, lateral view showing prodissoconch; A3, internal view with partly preserved hinge. B. Cassianella beyrichi Bittner, 1895, PZO 12861, in lateral view. C. Cassianella beyrichi Bittner, 1895, PZO 12862, in internal (C1) and lateral (C2) views.