Discartemon platymorphus van Benthem Jutting, 1954
“Compared with the other species of Discartemon of Malaya D. platymorphus is characterised as follows: The spire is lower than in Discartemon collingei, D. plussensis, D. roebeleni and D. stenostomus, and the umbilicus is wider than in any of these. From D. hypocrites it differs in the mouth armature, the greater size and the flatter spire. It has a higher spire and a narrower umbilicus than D. leptoglyphus. The last part of the ultimate whorl is not so wide and expanded as in D. leptoglyphus. From D. nummus it differs in not being angulate at the periphery and in lacking the reinforced callus at the junction of parietal lamella and sinus. Finally the upper margin of the peristome is not so deflected and protruded as in D. nummus. Discartemon sykesi is wider and flatter, with more open umbilicus.” (Benthem-Jutting, 1954)
Benthem-Jutting (1954) original descriptions on Discartemon platyorphus – “Shell almost discoidal, with very low spire, although not quite so low as in D. leptoglyphus. Glassy white. First 2 ½ whorls smooth, subsequent ones with fine, regular, close-set, somewhat wavy transverse ribs. On the last whorl, near the peristome, there are about 8-9 ribs to the mm. On the upper side of each whorl the ribs are batter developed than on the basal part. No spiral striation. Fresh shells shining and transparent. Whorls 6, convex. All normally coiled and regularly increasing in size. The terminal part of the ultimate whorl descends to the aperture. This part is also somewhat widened, but not quite so expanded as in D. leptoglyphus. Suture distinct, periphery rounded, Top little elevated, somewhat more than in D. leptoglyphus. Base broad and little convex (but not quite flat). Umbilicus rather wide, although not so wide as in D. leptoglyphus, showing all previous whorls. On the umbilical side the last whorl is bluntly angulate. Aperture trigonal or arrow-shaped. Very oblique. Peristome not continuous, thickened and reflected. Upper lip expanded and projecting, inflated in the middle, so as to form a distict tooth. Lower lip receding, toothless, but with a hardly palpable callosity in the middle. Parietal side with an almost horizontal sinuous lamella, entering 2-3 mm within the aperture. At the upper parietal corner the upper lip forms a sinuous ridge, joining the parietal lamella.”
Discartemon platyorphus – “Dimensions; Width 9.6-10.1, height 3.65-3.8, height of aperture 3 mm.” (Benthem-Jutting, 1954)
Type locality – “Gua Nenek, Kelantan” leg. Benthem-Jutting/Jul. 1939 (Benthem-Jutting, 1954)