Hypselostoma saxicola ( van Benthem Jutting, 1960 ), 2025

Hypselostoma saxicola ( van Benthem Jutting, 1960) comb. nov.

Gyliotrachela saxicola van Benthem Jutting, 1960: 14–16, fig. 1. View in CoL

Gyliotrachela saxicola View in CoL — Maassen 2001: 76.

Type material examined.

Malaysia • 22 paratypes; Perlis, N of Kangar, limestone hill near Kampong Tebing Tinggi , on the face of the rock; 19 Dec. 1958; W. S. S. van der Feen-van Benthem Jutting leg.; RMNH.Moll.137139 .

Type locality.

“ Limestone hill near Kampong Tebing Tinggi, N. of Kangar, Perlis ”, Malaysia.

Differential diagnosis.

This species is most similar to H. salpinx from which it can be separated by smaller number of overall stronger barriers and wider umbilicus (which is initially narrower in H. salpinx ). See also under H. coriaceum sp. nov.

Distribution.

This species is known only from the type locality.

Remarks.

In paratypes examined, besides the five barriers that are always present, there were additional 1–3 smaller. These are interpalatal, infrapalatal and infraparietal and they were present in some and absent in other specimens. As a consequence, the number of barriers varied from 6–8 (as there was always at least one of the smaller). This was also noted by van Benthem Jutting (1960) in the original description. She also noted that the last whorl can be more or less detached or completely adnate, but this variation is not useful for separation of the species.