Arinia obesa Vermeulen, 1996
“The angular edge of the peristome often has a slight ridge, which probably is oblique to the margin of the peristome. It is, however, so inconspicuous that its course cannot be ascertained.” (Vermeulen, 1996)
Vermeulen (1996) original descriptions on Arinia obesa – “Shell conical with convex sides, last whorl widest. Whorls 3 1/2-4, convex. Tuba 1/4 whorl. Radial ribs single-crested, on the penultimate whorl 4-6 ribs/0.5 mm, above the aperture with 4-5 ribs/0.5 mm; close to the outer peristome with numerous more distinct lamellae very close together. Spiral striation absent. Umbilicus open, 0.10-0.20 mm wide. Aperture not turned upwards. Peristome; palatal side almost moderately protruding beyond the penultimate whorl, columellar side not sinuous; outer peristome slightly spreading beyond the inner on the palatal and basal side, rather abruptly narrowed on the columellar side and towards the angular edge; inner peristome (moderately) protruding from the outer, spreading, just above the angular edge with or without an inconspicuous knob, palatal and. basal side without a lip parallel to the margin, its outer surface and the upper surface of the outer peristome with few (fine) lamellae.”
Arinia obesa – “Height 1.5-1.8 mm; width 1.1-1.2 mm; index 1.3-1.5. Height aperture 0.350.40 mm; width 0.35-0.45 mm.” (Vermeulen, 1996)
Type locality – “Borneo. Sarawak. 4th Div.: G. Subis (Batu Niah)” leg. Wall (Vermeulen, 1996)