Discartemon platymorphus Benthem Jutting, 1954

Siriboon, Thanit, Sutcharit, Chirasak, Naggs, Fred, Rowson, Ben & Panha, Somsak, 2014, Revision of the carnivorous snail genus Discartemon Pfeiffer, 1856, with description of twelve new species (Pulmonata, Streptaxidae), ZooKeys 401, pp. 45-107 : 67-68

14. Discartemon platymorphus Benthem Jutting, 1954 Figs 6G, H, 23

Discartemon platymorphus Benthem Jutting, 1954: 88-90, fig. 6. Type locality: Gua Nenek, Kelantan, Malaysia. Benthem Jutting 1959: 168. Berry 1965: 28, 29. Richardson 1988: 184. Maassen 2001: 87. Marwoto 2008: 192.

Material examined.

Holotype ZMA 3.54.022 (fragmented) (Fig. 6G). Paratype ZMA 3.54.023 (2 shells).

Remarks.

The shell is depressed-heliciform with the spire only slightly convex and with a distinct suture. The shell surface has transverse ridges that diminish below the periphery, and varices are present. The following whorls are regularly coiled. Last whorl rounded, regularly expanded; umbilicus widely open and deep. Aperture tri angular; peristome discontinuous, thickened, expanded and little reflected; apertural dentition of one parietal and one palatal lamella (Fig. 6H).

Discartemon platymorphus is closely similar to Discartemon plussensis , but that species has a larger shell with a higher spire and lacks a sinulus. Discartemon platymorphus differs from Discartemon epipedis sp. n. by having a lower spire, transverse ridges that diminish below the periphery, a shouldered last whorl, and apertural dentition with four lamellae. Compared with Discartemon stenostomus , Discartemon platymorphus has a lower spire with fine transverse ridges that disappear below the periphery, and a straight parietal lamella and one palatal lamella.