Gyliotrachela saxicola van Benthem Jutting, 1960
“Closely resembles with Gyliotrachela salpinx from Raub, Pahang. G. saxicola is somewhat larger, lower spire in comparison with the last whorl, wider umbilicus, usually with adnate peristome, dark-brown coloured shell. The aperture’s teeth fewer but more strongly developed than in G. salpinx.” (Benthem-Jutting, 1960)
Benthem-Jutting (1960) original descriptions on Gyliotrachela saxicola – “Shell small, with little elevated spire and wide last whorl. On its upper side this last whorl is somewhat swollen along the suture and along the periphery. Between these two swellings there is a distinct expression. Below the periphery the last whorl is at first slightly constricted, after that inflated, and finally abruptly turning towards the umbilicus. First two whorls minutely pitted, the following ones finely striated according to the growth lines. At irregular intervals the growth lines appear as axial ribs. This sculpture is crossed by equally fine spiral striae. The whole shell is covered by a dark-brown fibrous epidermis which is minutely hirsute along the spiral striae. Whorl 4-4¼ (in holotype 4¼), the last one broad and inflated. Top mamillar, a little obliquely placed on the following whorls. Base rounded. Umbilicus open and very wide. Aperture quadrangular, with rounded angles, widened, trumpet-shaped. Position of aperture a little oblique, the upper margin receding, the lower one protruding. Peristome continous, thin, broadened and expanded. The parieto-angular edge is mostly adnate to the previous whorl, but in some shells just free from it. The mouth contains 6-8 teeth. Parietal and angular teeth are separate. Columellar, upper and lower palatal teeth strong, interpalatal, infrapalatal and infraparietal one small. All teeth are microscopically spiniferous”
Gyliotrachela saxicola – “Shell height – 1.8-2.1 mm; Shell width – 2.6-3.0 mm. Aperture height – 1.1-1.3 mm. (Benthem-Jutting, 1960)
Type locality – “Limestone hill near Kampong Tebing Tinggi, N. of Kangar, Perlis” (Benthem-Jutting, 1960)