Malletiidae Adams and Adams, 1858

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 : 173

Family Malletiidae Adams and Adams, 1858 Genus Palaeoneilo Hall and Whitfield, 1869

Type species: Nuculites constricta Conrad, 1842 ; USA, Devonian.

Palaeoneilo distincta ( Bittner, 1895)

1895 Leda (?) distincta n. sp.; Bittner 1895: 150–152, pl. 16: 38, 39. 1981 Palaeoneilo distincta f. laubei (Bittner); Zardini 1981: pl. 3: 14, 15.

Material.— Four specimens, all from bulk samples; 2 from Lago Antorno ( PZO 12858 , 2 specimens); 2 from Misurina Landslide ( PZO 12746 , 2 specimens); Italy, Carnian , Triassic .

Remarks.—All specimens have the same outline and show only a weak sculpture of slightly strengthened growth lines similar to Bittner’ s (1895) and Zardini’s (1981) illustrations of Palaeoneilo distincta . The umbo is central, the shell outline circular to oval-shaped. The specimens studied herein also resemble Bittner’s (1895) Leda (?) zelima d’Orbigny, 1849, to some degree, however, this species is more oval than our shells. All four specimens are double-valved.

Stratigraphic and geographic range.—Carnian, Upper Triassic; northern Italy (Cassian Formation); Hungary (Bakony) ( Diener 1923; Paleobiology Database, https://paleobiodb.org).

Palaeoneilo elliptica (Goldfuss, 1837)

Fig. 26B .

1837 Nucula elliptica sp. nov.; Goldfuss 1837: 153, pl. 124: 16 (pars).

1841 Nucula elliptica Goldf. ; Münster 1841: 83, pl. 8: 8.

1843 Nucula tenuis ?; Klipstein 1843: 263, pl. 17: 17.

1848 Leda elliptica ; Deshayes 1848: 278.

1849 Leda elliptica ; d’Orbigny 1849: 197.

1852 Nucula Münsteri ; Giebel 1852: 389 (pars.).

1864 Nucula elliptica ; Alberti 1864: 102.

1864 Leda elliptica ; Laube 1864: 407.

1865 Leda elliptica Goldf. sp.; Laube 1865: 67–68, pl. 19: 6.

1895 Palaeoneilo elliptica Goldf. spec.; Bittner 1895: 142–143, pl. 16: 26–31.

1981 Palaeoneilo elliptica (Goldfuss) ; Zardini 1981: pl. 2: 12–14, pl. 3: 1, 2.

Material.— Three specimens, all from surface samples, 1 from Lago Antorno ( PZO 12859 , figured specimen); 2 from Misurina Landslide ( PZO 12747 , 2 specimens); Italy, Carnian , Triassic .

Remarks.—All specimens from Lago Antorno and Misurina Landslide are articulated. They fit best to Zardini’s (1981) illustrated shells of Palaeoneilo elliptica (Goldfuss, 1837) . Also Bittner’s (1895) illustrated specimens are similar in shape to our specimens.

Stratigraphic and geographic range.—Carnian, Upper Triassic; northern Italy (Cassian Formation); southern Italy (Sicily); Germany (Muschelkalk, Lettenkohle); Switzerland; Hungary (Bakony); Libya (Tripolis). Rhaetian, Argentina (Mendoza, Arroyo Malo Formation). Anisian, Bosnia and Herzegovina. Triassic: China; Japan; Russia. Sinemurian, Mexico (Sonora, Sierra de Santa Rosa Formation). Jurassic, Portugal.Hettangian, United Kingdom (Blue Lias Formation) ( Kutassy 1931; Paleobiology Database, https://paleobiodb. org).

Order Mytilida Férussac, 1822

Superfamily Mytiloidea Rafinesque, 1815

Family Mytilidae Rafinesque, 1815

Genus Modiolus Lamarck, 1799

Type species: Mytilus modiolus Linnaeus, 1758 ; Mediterranean, Recent.

Modiolus paronai Bittner, 1895

1895 Modiola Paronai nov. spec.; Bittner 1895: 48, pl. 5: 19, 20. 1981 Modiolus paronai (Bittner) ; Zardini 1981: pl. 6: 16, 17, pl. 7: 1, 2. 2015 Modiolus paronai ; Hausmann and Nützel 2015: fig. 9G.

Material.—One valve ( PZO 12748) from Misurina Landslide bulk sample, Italy, Carnian, Triassic.

Remarks.—The single-valved specimen is heavily encrusted and, with a length of ca. 1 mm, very small. However, it closely resembles Zardini’s (1981) illustrated specimens of Modiolus paronai Bittner, 1895 . M. paronai Bittner, 1895 was also found at the Cassian locality Stuores Wiesen, where it was represented by 15 specimens ( Hausmann and Nützel 2015).

Stratigraphic and geographic range.—Carnian, Upper Triassic; northern Italy (Cassian, Gorno, and Lombardische formations); Libya (Tripolis); Argentina (?), Middle Triassic; Jordan (Wadi Hesban); Slovenia (Julian); China (Leidapo Member) ( Diener 1923; Kutassy 1931; Paleobiology Database, https:// paleobiodb.org).

Order Ostreida Férussac, 1822

Superfamily Pterioidea Gray, 1847 (1820)

Family Bakevelliidae King, 1850

Genus Gervillia Defrance, 1820

Subgenus Cultriopsis Cossmann, 1904

Type species: Gervilleia (Cultriopsis) falciformis Cossmann, 1904 ; France, Jurassic.

Figures

Fig. 26. Nuculid bivalves from LagoAntorno (A, B) and Misurina Landslide (C–E), northern Italy, Cassian Formation, Carnian, Upper Triassic.A. Nuculana sulcellata (Wissmann, 1841), PZO 12857, in lateral view.B. Palaeoneilo elliptica (Goldfuss, 1837), PZO 12859, in lateral (B1) and dorsal (B2) views. C. Palaeonucula strigilata (Goldfuss, 1837), PZO 12742, in lateral (C1) and dorsal (C2) views. D. Palaeonucula strigilata (Goldfuss, 1837), PZO 12743, in lateral view. E. Nuculana sulcellata (Wissmann, 1841), PZO 12745, in lateral (E1) and dorsal (E2) views.