Plectostoma umbilicatum (Liew, Thor-Seng, Vermeulen, Jaap Jan, Marzuki, Mohammad Effendi bin & Schilthuizen, Menno 2014)
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- Plectostoma umbilicatum Liew, Thor-Seng, 2014, ZooKeys 393: 33-34.
Description. Apex. Shape: moderately convex. Spire. Height: 2.0-2.3 mm. Width: 1.3-1.5 mm. Number of whorls: 4 5/8-4 3/8. Apical spire shape: oblong conical. Basal spire shape: ovoid. Whorl periphery: distinctly convex. Umbilicus: completely open or partially closed by tuba. Constriction. Parietal teeth: none. Basal teeth: none. Tuba. Coiling direction: type 1 and aperture visible from back view. Tuba whorl length in proportion to spire last whorl: ca. 1/2-3/4. 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: present. Thin lines: present. Radial ribs. Rib density: 6-9 ribs per mm. Rib intensity: thin. Shape: straight. Inclination: orthoclin.
Distribution. Type locality. Limestone hill cluster named Kota Tongkat (3°53'28"N, 102°28'23"E). Distribution range. It is only known from the type locality. All other adjacent limestone outcrops have been sampled, but only other Plectostoma species were found (Figure 18D).
Discussion. See discussion under Plectostoma christae.