Hypselostoma elephas van Benthem Jutting, 1950
Benthem-Jutting (1949) original descriptions on Hypselostoma elephas – “Shell consisting of a conical spire and an enormously prolonged and projecting ultimate whorl. Dark reddish-brown, somewhat more yellowish-brown towards the aperture. First 1 ¼ whorl smooth and polished, the following ones irregularly striated or weakly ribbed with oblique growth lines. Not transparent. Whorls 4 ½ of which 4 are regularly coiled in spiral direction and about ½ whorl, the last part, straight and projecting. Spire moderately conical, top-angle rather broad. Suture deep. Periphery somewhat angular, but not acute. After about 3 ½ whorls a shallow longitudinal groove sets in above the periphery. It continues on the free part of the last whorl, ending behind the upper palatal plica. A similar longitudinal groove runs along the dorsal side of the free trumpet, ending behind the parietal-angular lamella. Umbilicus narrow, somewhat hidden behind a slight local inflation of the last whorl, just before the free tube. Free part of the last whorl narrower than the preceding part. Towards the aperture, however, it expands again. Aperture oblique, armed with four large teeth and a small infraparietal lamella. Parietal and angular lamellae concrescent. Peristome continuous, somewhat thickened and expanded.”
Hypselostoma elephas – “Dimensions: Height – 1.95 mm; Breadth at commencement of trumpet – 2.5 mm; Length of trumpet (including peristome) – 3.3 mm; Breadth of trumpet at its origin – 1.4 mm; Breadth of trumpet at its narrowest part – 1.0 mm. (Benthem-Jutting, 1949)
Type locality – “Bukit Tenggek, Pahang” leg. Benthem-Jutting/1947 (Benthem-Jutting, 1949)