Stomacosmethis kapayanensis costacrassa (Foon & Liew, 2017)

Alycaeus costacrassa Foon & Liew, 2017: 33-35, figs 7M, 15, 31N.

Type locality.

"Mykarst-065 Batu Balong, Pahang (3°42'41"N, 101°51'25"E)".

Remarks.

This taxon differs from Alycaeus kapayanensis selangoriensis and Stomacosmethis kapayanensis kapayanensis in characters of the operculum and shell sculpture, formation of the peristome and the body whorl. We believe however, that such characters are of minor taxonomic importance, and therefore, Alycaeus costacrassa is here considered a subspecies of S. kapayanensis .