Plectostoma dindingensis, Liew, Thor-Seng, Vermeulen, Jaap Jan, Marzuki, Mohammad Effendi bin & Schilthuizen, Menno, 2014

Liew, Thor-Seng, Vermeulen, Jaap Jan, Marzuki, Mohammad Effendi bin & Schilthuizen, Menno, 2014, A cybertaxonomic revision of the micro-landsnail genus Plectostoma Adam (Mollusca, Caenogastropoda, Diplommatinidae), from Peninsular Malaysia, Sumatra and Indochina, ZooKeys 393, pp. 1-107 : 30-31

Plectostoma dindingensis sp. n. Figure 19, Appendix 7

Type material.

Holotype: BOR 5642(1). Paratypes: BOR 5612(3)

Diagnosis.

Shares with Plectostoma mengaburensis and Plectostoma panhai the general shell form, in terms of apex, spire and tuba, but differs by lacking constriction teeth and having a more tightly coiled tuba (less than 1/4 of the tuba visible in top view).

Etymology.

This species is named after its type locality–Dinding.

Description.

Apex. Shape: moderately convex.

Spire. Height: 1.8-1.9 mm. Width: 1.4-1.5 mm. Number of whorls: 3 7/8-4 5/8. Apical spire shape: depressed conical. Basal spire shape: ovoid. Whorl periphery: distinctly convex. Umbilicus: 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. 5/8-3/4. Proportion of tuba that attaches to the 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: 6-8 ribs per mm. Rib intensity: thin. Shape: straight. Inclination: orthoclin.

Distribution.

Type locality. The exact location is unknown. The specimens are labeled as collected from “dinding”. It could be near Kampung Bukit Dinding, Pahang (3°49'41"N, 102°22'3"E).

Distribution range. The species has only been recorded from the type locality (Figure 18D).

Conservation status.

Vulnerable (D2 ver. 10.1). The samples was collected from a living population in 1997. The population status remains unclear. The area around Kampung Bukit Dinding has been converted to plantation and no significant undisturbed forest coverage remains.

Discussion.

See discussion under Plectostoma christae .