Vetigastropoda Salvini-Plawén, 1980

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 : 151

Subclass Vetigastropoda Salvini-Plawén, 1980 ?Family Turbinidae Rafinesque, 1815

“ Turbo ” sp.

Fig. 6 .

Material.— One specimen ( PZO 12740 ) from the Misurina Landslide surface sample, Italy, Carnian, Triassic .

Description.—Shell turbiniform, comprising ca. 6 whorls 5.4 mm high, ca. 4.4 mm wide (specimen slightly compressed, appearing wider); whorl embracing at mid-whorl periphery; last whorl distinctly higher than spire; whorl face moderately convex with shoulder giving spira gradate appearance; whorls ornamented with strengthened prosocline and slightly prosocyrt growth-lines; base evenly convex, seemingly anomphalous.

Remarks.—Turbiniform shape and prosocline ornament of strengthened growth lines suggest that this specimen represents a turbinid vetigastropod species. The specimen from Misurina that was figured by Zardini (1978: pl. 12: 7 and 1985: pl. 10: 2) as Solarioconulus nudus ( Münster, 1841) is probably conspecific with the present specimen. However, S. nudus is much broader with a greater apical angle according to the figures provided by Münster (1841) and Kittl (1892). Moreover, it lacks the strengthened growth lines and is smooth according to Kittl (1892). Trochus lissochilus Kittl, 1892 , is similar but lacks a shoulder and the transition to the base is rounded angular. Turbo ? vixcarinatus Münster, 1841, resembles the present specimen but lacks a shoulder and according to Kittl (1892) the growth lines are straight. We think that the present specimen represents an undescribed species but more material is necessary to characterize it sufficiently.

Figures

Fig. 6. Turbinid? gastropod “Turbo” sp., PZO 12740, from Misurina Landslide, northern Italy, Cassian Formation, Carnian, Upper Triassic. In apertural (A1) and lateral (A2), and apical (A3) views;A4, early whorls in lateral view.