Alexogyra marshalli Bandel, 1996

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 : 168

Alexogyra marshalli Bandel, 1996

Fig. 23 .

Material.— Seven specimens ( PZO 12842–12845 , 4 figured specimens; PZO 12841 , 3 specimens), all from Lago Antorno bulk samples, Italy, Carnian, Triassic .

Description.—Shell almost planispiral with very slightly elevated spire; teleoconch flatly dextral; with about three whorls, 1.0 mm wide, 0.5 mm high; protoconch flat, comprising about 1.5 whorls, diameter 0.26 mm; initial whorls dipping, sinistral; remaining protoconch flatly dextral; protoconch smooth, with convex whorls; protoconch demarcated from teleoconch by a distinct suture and a bulge; teleoconch whorls smooth, convex, circular in transverse section; suture distinct; base distinctly phaneromphalous.

Remarks.—The present specimens agree well with Bandel’s 1996) type specimens from the type locality Misurina Skilift.

Stratigraphic and geographic range.—Only known from the Carnian, Upper Triassic; northern Italy (Cassian Formation).

Figures

Fig. 23. Hyalogyrinid gastropod Alexogyra marshalli Bandel, 1996 from Lago Antorno, northern Italy, Cassian Formation, Carnian, Upper Triassic. A. PZO 12842, in apical view. B. PZO 12843, in apertural view. C. PZO 12844, protoconch in oblique lateral view. D. PZO 12845, in oblique apertural view to show base.