Gyliotrachela transitans heliscopia van Benthem Jutting, 1950
“There is some variation in the length of the free part of the last whorl, some shells having a short, others a longer trumpet. Besides the usual 7 teeth in the aperture some shells have an additional small interpalatal and a basal tooth. Compared with the main form Gyliotrachela transitans helioscopia has a more slender spire and the trumpet more free from the body whorl. This trumpet which in G. transitans transitans is directed slightly downward, is pointing forward or a little upward in the new subspecies. The peripheral carina of the last whorl is generally weaker and the longitudinal grooves shallower than in the main form. In the mouth armature there are no differences. Compared with G. transitans venusta the spire is higher, the peripheral keel and the longitudinal grooves shallower.” (Benthem-Jutting, 1949)
Benthem-Jutting (1949) original descriptions on Gyliotrachela transitans helioscopia – “Shell with a rather conical spire and a free, trumpet-shaped end of the last whorl. Dark reddish-brown, somewhat more yellowish-brown towards the aperture. First 1½ whorls smooth, polished; the others irregularly striated with oblique growth-lines. There is no spiral striation. Not transparent. Whorls 4½-4¾ of which 4¼-4½ are regularly coiled and adnate, and about ¼ whorl free and projecting. Whorls of the spire at first well rounded, afterwards somewhat flatter. The last whorl, the free as well as the spiral part, is shallowly pinched just above and below the periphery, so as to give the ultimate whorl an angulate appearance. On the the free part there are two or three similar keels, placed cross-wise. Hence the trumpet is almost square in diameter. Free portion directed forward, or slightly ascending. Umbilicus open, moderately wide, the last part encircled by the basal keel. Aperture oblique, widened, trumpet-shaped. Peristome continuous, thickened and expanded. In the aperture the parietal and angular lamellae are separate. Columellar, upper palatal and lower palatal teeth rather strong, infraparietal an infrapalatal ones weak.”
Gyliotrachela transitans helioscopia – “Dimensions: Height – 2.1-2.8 mm; Breadth (with peristome) – 3.2-3.3 mm; Breadth (at origin of free part) – 1.8-2.0 mm; Height of aperture – 1.3-1.5 mm. (Benthem-Jutting, 1949)
Type locality – “Kota Tongkat, Pahang” leg. Benthem-Jutting/1947 (Benthem-Jutting, 1949)
Other locality – “Kota Gelanggi, Pahang” leg. Benthem-Jutting/1947 (Benthem-Jutting, 1949)