Genus Pseudotritonium Wenz, 1940
TYPE SPECIES. — Scalaria venusta Münster, 1841; by typification of replaced name. Triassic (Carnian), Italy.
EMENDED DIAGNOSIS. — Shell fusiform; protoconch highly conical multispiral with abrupt transition to teleoconch; larval whorls convex and ornamented with faint oblique threads; teleoconch whorls convex with opisthocline axial ribs which are crossed by numerous finer spiral lirae; aperture wide, D-shaped; it seems to be siphonostomous.
SPECIES INCLUDED. — Pseudotritonium venustum (Münster, 1841), P. laubei (Kittl, 1894), P. milierensis Zardini, 1978, P. sciaphosterum (Batten & Stokes, 1986) and possibly P. avena (Laube, 1868).
RANGE. — Triassic (Olenekian-Carnian).
REMARKS
Only a few species of Pseudotritonium are known so far. They are rare and almost all of them occur exclusively in the deposits of the Upper Triassic of the St. Cassian Formation (Dolomites, Italy). The only species described outside this formation is P. sciaphosterum (Batten & Stokes, 1986), which was described from the Lower Triassic Moenkopi Formation (San Rafael Swell, Utah, United States) (Batten & Stokes 1986; Nützel 2010) and has preserved protoconchs.
In the following, species of Pseudotritonium are discussed:
Publication Date: 2024-12-18