Lymnaea truncatula var. subangulata Roffiaen, 1868

Lymnaea truncatula var. subangulata Roffiaen, 1868 View in CoL

Limnæa truncatula var. subangulata Roffiaen, 1868: 78, pl. 1, fig. 9.

Type material.

Not located.

Type locality.

Switzerland: Altdorf, in a ditch on the plains towards Seedorf . “ […] prés d’Altorf, dans un fossé de la plaine vers Seedorf (M. Colbeau) ” ( Roffiaen 1868: 78) .

Taxonomic status.

Junior synonym of Galba truncatula (O. F. Müller, 1774) (cf. Hubendick 1951; Vinarski 2024).

Discussion.

No specimens belonging to this taxon were found. The original description mentions a few specimens and describe them as being “ contorted and misshapen ” (“ contourné et difforme ”; Roffiaen 1868: 78) and the accompanying illustrations confirm that description. Likely, these specimens are individuals of Galba truncatula that experienced some problems during growth (e. g., shell breakage and consequent scar and irregular shell growth).

A species that has been named Lymnaea (Galba) subangulata in the Russian literature ( Kruglov and Starobogatov 1993; Kruglov 2005; Vinarski and Kantor 2016) differs from Roffiaen’s Limnæa truncatula var. subangulata . The shell of the former is not “ contorted and misshapen ” and represents, possibly, an intraspecific morph of G. truncatula characterized by a rounded shell with small spire and somewhat inflated body whorl.