Opisthostoma hailei Solem, 1964
Keningau, Sabah, Malaysia.
Keningau, Sabah, Malaysia.
By Solem (1964)
"shell ovate cyclindric, white. Whorls 4. Apical whorls 1 5/8, sculpture of fine, crowded radial ribs whose interstices are bout twice their width. Apex slightly emerging, alittle slanted. First post apical whorl flatly coiled with widely spaced radial ribs (seven visible in front) and a microsculpture of fine, crowded spiral riblets that continue to the aperture. Second post apical whorl descending realtively sharply, but nuch wider than the preceeding with slightly more crowded sculpture (thirteen ribs visible in front). Last whorl much more tightly coiled, completely below penultimate, sharply constricted just before twisting upwards and backward. Reflected portion curving evenly and appressed to whorls. Aperture trumpet-shaped, rapidly expanded, reaching almost to upper edge of second post-nuclear whorl, slanted at about 45 degrees angle to shell axis. Lip ovate-triangular, multiplex, inner lip sinuated with two prominent lip teeth. One tooth in middle of upper lip margin, a broadly triangular swelling that slopes gently backward. Second tooth in middle of inner edge of lip, alittle lower and extending further into the apertiure. Umbilicus moderately and evenly open. Operculum unknow. Height of Holotype 1.18mm, diameter 1.51 mm."
By Vermeulen (1994)
"Shell white, slightly translucent. Whorls 3 1/8- 3 1/2 (tuba not included); top whorls somewhat oblique, moderately elevated; body whorls forming a slightly obliquely cylindrical body, convex, moderately elevated; body whorls forming a slightly obliquely cylindrical body, convex, moderately angular, with the suture well impressed. Constriction rather distinct, gradual. Tuba consisting of approximately 1/2 whorl (rarely somewhat less), touching the body whorls over its entire length, subtriangular in section. Shell with rather broad radial ribs, which are widely spaced near the top, moderately spaced and low on the upper body whorl (23-25 ribs present on the whorl), approximately similar but somewhat woder spaced on the lower body whorl and over the area of the constriction, and moderately spaced and slightly more prominent on the tuba. Ribs crossed by the spiral striation. Umbilicus open, deep, narrow. Aperture with the imaginary plane through the inner peristome tilted up to 15 degrees with regard to the coiling axis of the body whorls; with the upper margin not or hardly protruding beyond the plane perpendicular to the coiling axis of the body whorls as well as through the apex; subtriangular; apertural teeth two: one very short, knob-like along the upper margin, close to the peristome; one long, lamella-like along the lower margin, starting at the constriction and ending close to the peristome; inner peristome moderately thickened, moderately reflected; outer peristome distinctly flaring on the palatal side. Constriction inside with two teeth: the above-mentioned longitudinal lamella starting as a parietalis, and a distinct, oblique, short, rather high infracolumellaris; palatalis absent, sometimes present but very inconspicuous.Height of body whorls 1.1-1.3 mm; width including tuba 1.6-1.9 mm, without tuba 1.0-1.1 mm; height of aperture 0.6-0.7 mm; width of aperture 0.6-0.7 mm"