Gastropoda, Cuvier, 1795

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 : 171-172

Gastropoda indet. 2

Material.—One shell ( PZO 12854) from Lago Antorno bulk sample, Italy, Carnian, Triassic.

Remarks.—The shell is smooth, high-spired with low whorls; the apex is missing. Although distinct in this collection, this specimen cannot be identified.

Class Bivalvia Linnaeus, 1758

Order Nuculida Dall, 1889

Superfamily Nuculoidea Gray, 1824

Family Nuculidae Gray, 1824

Genus Palaeonucula Quenstedt, 1930

Type species: Nucula hammeri Defrance, 1825 ; France, Jurassic.

Palaeonucula strigilata (Goldfuss, 1837)

Fig. 26C, D .

1837 Nucula strigilata ; Goldfuss 1837: 153–154, pl. 124: 18a–c.

1841 Nucula strigilata Goldf. ; Münster 1841: 83, pl. 8: 10a, b.

1865 Nucula strigilata Goldf. ; Laube 1865: 65, pl. 19: 2.

1895 Nucula strigilata Goldf. ; Bittner 1895: 137–138, pl. 17: 1–17.

1977 Palaeonucula strigilata (Goldfuss) ; Fürsich and Wendt 1977: fig. 11.

1981 Palaeonucula strigilata (Goldfuss) ; Zardini 1981: pl. 1: 1–14, pl. 39: 11.

1988 Palaeonucula strigilata Goldfuss ; Zardini 1988: pl. 1: 3, 4.

2012 Palaeonucula strigilata (Goldfuss, 1837) ; Urlichs 2012: 5, pl. 1: 3.1–3.3, 4, 8.

2014 Palaeonucula strigilata (Goldfuss 1837) ; Nützel and Kaim 2014: 423, figs. 10a, d.

Material.— Twenty specimens, 12 from bulk samples, 8 from surface samples; 2 from Lago Antorno ( PZO 12855 , 2 specimens); 18 from Misurina Landslide ( PZO 12742 , 12743 , 2 figured specimens; PZO 12741 , 16 specimens); Italy, Carnian , Triassic .

Remarks.—All specimens are double-valved and the shells are often diagenetically compressed. In many cases, the co-marginal ribs are concealed by encrustation. Palaeonucula strigilata (Goldfuss, 1837) is a very common bivalve in Cassian deposits and was therefore also found at many other Cassian localities, including Costalaresc, Piz Stuores, Pralongia, Rio Pocol, Settsass Scharte and Stuores Wiesen ( Fürsich and Wendt 1977; Urlichs 2012; Nützel and Kaim 2014). This species constitutes the second most abundant taxon in the Rhaphistomella radians / Palaeonucula strigilata association and even the most abundant species of the Palaeonucula strigilata / Dentalium undulatum association described by Fürsich and Wendt (1977).

Stratigraphic and geographic range.—Carnian, Upper Triassic; northern Italy (Cassian Formation), southern Italy (Sicily, Raibl Formation); Hungary (Bakony); Spain (Boyar section); Turkey ( Anatolia); Switzerland (Röti Formation). Upper Triassic, Norian, Russia (Primorskiy Kray). Middle Triassic, Anisian–Ladinian, Vietnam.Triassic: Oman; Libya (Tripolis); Indonesia. Middle to Upper Triassic, China (Liyantang, Kuahongdong, Qiaotou).Jurassic, upper Bajocian–Bathonian, Poland (Polish lowland) ( Diener 1923; Kutassy 1931; Paleobiology Database, https://paleobiodb.org).

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.