Gyliotrachela transitans venusta van Benthem Jutting, 1950
“In addition to the teeth mentioned in the foregoing description some shells of the lot are provided with one or two more small teeth, viz. an interpalatal and a basal fold. Gyliotrachela transitans venusta differs the main form in having a somewhat higher spire and the trumpet more free from the body whorl. The trumpet which in G. tr. transitans is directed slightly downward, points forward in G. transitans venusta. In the development of the peripheral keel, the longitudinal grooves and the mouth armature there are no marked differences between the two subspecies. Compared with Gyliotrachela transitans helioscopia, described below, the spire of the subspecies venusta is not so elevated, the peripheral keel more pinched and the longitudinal grooves deeper.” (Benthem-Jutting, 1949)
Benthem-Jutting (1949) original descriptions on Gyliotrachela transitans venusta – “Shell consisting of a somewhat conical spire and a free, trumpet-shaped last quarter of a whorl. Dark reddish-brown, somewhat more yellowish-brown towards the aperture. First 1½ whorls smooth, polished; the others delicately striaed with oblique growth-lines. There is no spiral striation. Not transparent. Whorls 4¾-5, or which 4½-4¾ are regularly coiled and adnate, and about ¼ whorl free and projecting. Top mamillar. Whorls of the spire evenly rounded, suture deep. After about 3 ½ normal whorls the shell is somewhat pinched above and below the periphery. Consequently a keel is formed along the periphery, at first only vaguely discernable, later on very conspicuous. The keel continues on the exterior side of the free trumpet till the aperture. On the dorsal and inner lateral sides of the trumpet there are similar longitudinal keels. Base sides of the trumpet there are similar longitudinal keels. Base somewhat inflated. Towards the aperture the free part is at first narrower, then suddenly expanded for the peristome. Umbilicus open, moderately wide. Aperture almost vertical, widened, trumpet-shaped. Peristome continuous, somewhat thickened and expanded. The aperture contains 7 teeth, angular and parietal lamellae separated. Colummelar, upper and lower palatal teeth strong, infrapalatal ones small.”
Gyliotrachela transitans venusta – “Dimensions: Height – 2.7-2.9 mm; Breadth (with peristome) – 2.9-3.4 mm; Breadth (at origin of free part) – 1.9-2.1 mm; Height of aperture – 1.3-1.5 mm. (Benthem-Jutting, 1949)
Type locality – “Gunong Pondok, Padang Rengas, Perak” leg. Benthem-Jutting/1939 (Benthem-Jutting, 1949)