[Sykes, 1903]
A single specimen, found by Mr. Annandale in debris on the floor of a cave. Related to O. laidlawi Sykes, from Kelantan, but the present species is larger, and the spire is much more produced, thus becoming more cylindrical in apperance.
[Sykes, 1903]
Testa conico-pyramidalis, perforata, pallide ruescens, spira bene elevata, apice obtusa; anfr. 7, convexi, primi laeves, reliqui distande lamellati, ultimus constrictus, retroversus, ascendens, conspicue solutus; apertura rotundata, peristomate leviter incrassato. alt. 2.2; diam. max. 2.8; diam. min. 1.6 millim.
[Liew et al. 2014]
Description
(estimated from figure in Sykes 1903). Apex. Shape: moderately convex.
Spire. Height: 2 mm. Width: 1.3 mm. Number of whorls: 4 1/2. Apical spire shape: depressed conical. Basal spire shape: conical. Whorl periphery: moderately convex. Umbilicus: Open.
Constriction. Unknown.
Tuba. Coiling direction: type 2 and aperture visible in right lateral view. Tuba whorl length in proportion to spire last whorl: approximately the same as the spire’s last whorl length. Proportion of tuba that attaches to spire: less than 1/2.
Aperture and peristome. Peristome: double peristomes. Outer peristome shape: same as inner peristome and uniformly projected all around, except the posterior part.
Spiral lines. Unknown
Radial ribs. Rib density: 5 ribs per mm. Rib intensity: unknown. Shape: straight. Inclination: orthoclin.