Plectostoma kayiani Liew, Vermeulen, Marzuki & Schilthuizen, 2014  

Apex. Shape: slightly to moderately convex.

Spire. Height: 1.4–1.6 mm. Width: 1.2–1.4 mm. Number of whorls: 3 1/2–3 3/4. Apical spire shape: depressed conical. Basal spire shape: conical. Whorl periphery: distinctly convex. Umbilicus: open.

Constriction. Parietal teeth: none. Basal teeth: none.

Tuba. Coiling direction: type 2 and aperture visible from front view. Tuba whorl length in proportion to spire last whorl: ca. 5/8–3/4. Proportion of tuba that attaches to spire: almost whole except the part near the aperture.

Aperture and peristome. Peristome: double peristomes. Outer peristome shape: similer to inner peristome, projected all around, except the posterior part, where left lateral sides are slightly more projected than the anterior and right lateral side.

Spiral lines. Thick lines: absent. Thin lines: present.

Radial ribs. Rib density: 8–10 ribs per mm. Rib intensity: thin. Shape: slightly curved. Inclination: orthoclin.