Oophana diaphanopepla van Benthem Jutting, 1954
“Compared with the preceding species O. (H.) diaphanopepla is smaller and of more regular shape. Its top is more projecting and its costulation finer. The overhanging part of the last whorl is moderate, not keeled. Finally it has a narrower and less eccentric umbilicus. From O. (H.) striatula, andamanica and blanfordi it differs in having a spout-shaped aperture. The constrictions in the last part of the ultimate whorl are also lacking in these three species. From O. (H.) striatula it further differs in having the costulation confined to the upper surface.” (Benthem-Jutting, 1954)
Benthem-Jutting (1954) original descriptions on Oophana (Haploptychius) diaphanopepla – “Shell globular-conical, white or cream coloured, glassy transparent, shining. Whorl about 6, the first 2½ smooth. The following ones have their upper surface transversely ribbed with delicate, curved ribs, about 16 to the mm on the last whorl. Towards the base these ribs fade away. The spire is regular for about four whorls. The fifth whorl deviates abruptly, continuing obliquely sidewards under the top whorls. Consequently the fourth whorl is more exposed and slightly overhangs the following ones. The periphery of this overhanging part is not keeled or angular. As in the preceding species the last whorl, before reaching the peristome, is transversely constricted, then inflated, and after this just behind the peristome constricted again. This last constriction is divided into an upper and lower part by a short, longitudinal ridge, coinciding with the periphery. Top elevated, obtuse. Base rounded. Umbilicus open and somewhat eccentric, but not quite so much as in O. (H.) atopospira. Along the umbilicus the base of the last whorl is angular. The side facing the umbilicus is coarsely ribbed. Aperture narrow, spout-shaped, very oblique in the vertical and in the horizontal line. Entrance narrow, more or less arrow-shaped through obstruction by parietal lamella and thickened peristome. Peristome not contibuous. Margin reflexed and thickened, especially at the points where the upper and lower constrictions, mentioned above, are situated. The resulting callosities look like broad teeth. Parietal lamella strong, undulating, entering the aperture for about 3 mm. The exterior point of attachment forms a bifid or triangular callosity. At the upper parietal corner the lamella forms a sinuous ridge, joining the upper margin of the aperture.”
Oophana (Haploptychius) diaphanopepla – “Dimensions; Width 6.4-7.5, height 4.0-5.5, Longest axis of aperture 3-3.5 mm.” (Benthem-Jutting, 1954)
Type locality – “Bukit Serdam, near Raub, Pahang” leg. P. D. R. William-Hunt/Sep. 1950 (Benthem-Jutting, 1954)