Plectostoma sinyumensis (Liew, Thor-Seng, Vermeulen, Jaap Jan, Marzuki, Mohammad Effendi bin & Schilthuizen, Menno 2014)
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- Plectostoma sinyumensis Liew, Thor-Seng, 2014, ZooKeys 393: 32-33.
Diagnosis. Shares with Plectostoma dindingensis, Plectostoma mengaburensis, Plectostoma christae, and Plectostoma panhai the general shell form, in terms of apex, apical spire and tuba, but differs by having an ellipsoid basal spire.
Description. Apex. Shape: moderately convex. Spire. Height: 1.6-1.9 mm. Width: 1.2-1.3 mm. Number of whorls: 3-3 3/4. Apical spire shape: depressed conical. Basal spire shape: ellipsoid. Whorl periphery: distinctly convex. Umbilicus: almost completely closed by tuba. Constriction. Parietal teeth: none. Basal teeth: none. Tuba. Coiling direction: type 1 and aperture visible between right lateral and back view. Tuba whorl length in proportion to spire last whorl: ca. 5/8-3/4. Proportion of tuba that attaches to spire: whole. Aperture and peristome. Peristome: double peristomes. Outer peristome shape: same as inner peristome and uniformly projected all around, except the posterior part. Spiral lines. Thick lines: absent. Thin lines: present. Radial ribs. Rib density: 9-10 ribs per mm. Rib intensity: thin. Shape: straight. Inclination: orthoclin.
Distribution. Type locality. Gunung Senyum, Pahang (3°42'35"N, 102°26'3"E). Distribution range. In addition to the type locality, this species also was found at the Jebak Puyuh limestone outcrop, which lies about 1 km east of Gunung Senyum (Figure 18D). BOR 462 was collected in Pulau Singa Besar, which is located about 300 km from type locality. The reliability of the collection data is dubious (the same was found for BOR 463 of Plectostoma relauensis).
Discussion. See discussion under Plectostoma christae.