Arinia brevispira orientalis Vermeulen, 1996
“On average, the Tabin specimens are slightly smaller, have a shorter and wider shell, and have a wider umbilicus, than the specimens found near Lahad Datu.” (Vermeulen, 1996)
Vermeulen (1996) original descriptions on Arinia brevispira orientalis – “As the nominate subspecies, but last whorl (moderately) convex above the periphery, and somewhat flattened below. Radial ribs double-crested on the penultimate whorl, but towards the ultimate whorl and on the tuba single-crested again. Umbilicus open, 0.15-0.25 mm wide.”
Arinia brevispira orientalis – “Height 1.35-2.10 mm; width 0.95-1.20 mm; index 1.4-1.8. Height and width aperture 0.35-0.50 mm.” (Vermeulen, 1996)
Type locality – “Borneo. Sabah. Tawau Zone: ‘Kirk’s Cave’, 8 km N. of Lahad Datu” (Vermeulen, 1996)
Other localities – “Borneo. Sabah. Sandakan Zone: limestone escarpment along Sg. Tabin, lower Segama valley” leg. Wilford (Vermeulen, 1996); “Borneo. Sabah. Sandakan Zone: limestone escarpment W. of Sg. Tabin, lower part, lower Segama valley” leg. Wilford (Vermeulen, 1996);