Oophana thamnophila van Benthem Jutting, 1954
“The new species has some affinity with Oophana (Haploptychius) porrecta (Pfr.) from Siam, and to O. (H.) pfeifferi (Zelebor) from the Nicobar Islands. From the first it differs in the following respects: O. (H.) thamnophila is more obliquely deformed than O. (H.) porrecta, with a lower spire and a wider umbilicus. The shell surface is more ribbed. The aperture is wider (i.e. more elongate) and the last whorl more inflated than in O. (H.) porrecta. From O. (H.) pfeifferi it can be distinguished by the greater height, which is especially conspicuous in the last whorl, by the wider (i.e. more elongate) aperture, the absence of spiral striation and the more oblique shape. The ultimate whorl of O. (H.) thamnophila is generally less inflated than the corresponding part of O. (H.) pfeifferi, the fourth whorl projects more in the shell profile, and, finally, the parietal lamella is better developed in the new species than in O. (H.) pfeifferi. It has also some likeness to O. (H.) andamanica (Bens.), but the latter is more obliquely deformed with a flatter spire and a narrower (less round) aperture. (Benthem-Jutting, 1954)
Benthem-Jutting (1954) original descriptions on Oophana (Haploptychius) thamnophila – “Shell obliquely conical, creamy white, transparent, First 2½ whorls smooth, In the following ones the upper surface is beset with numerous delicate transverse ribs, about 8 to 10 to the mm. On the last whorl the ribs are placed wider apart, about 5 to the mm. On the basal side the ribs fade away. Here the shell is much more polished than on the upper side. Whorls 5½-6, the first 3-4 regularly coiled, the fifth an sixth pressed obliquely to the right, so that the fourth whorl bulges out at the left side of the shell profile. This overhanging part is slightly flattened, but never compressed or pinched, and never angular. Top pointed, but not acute, base oblique, inflated. Umbilicus open, but not wide, about 1 mm diameter at the entrance. Apertural oval, or quadrangular with rounded angles. Very oblique. Peristome not continuous; thickened and reflected, without teeth. On the parietal side of the aperture is an oblique lamella which enters about 1-2 mm into the shell.”
Oophana (Haploptychius) thamnophila – “Dimensions; Width 8.0-9.0, height 7.0-7.8, height of aperture 3.7-4.0 mm, Greatest diam. 8.8-9.7.” (Benthem-Jutting, 1954)
Type locality – “Gua Tinggi, Lipis area, Pahang” leg. H. Service/1948 (Benthem-Jutting, 1954)