Arinia paricostata Vermeulen, 1996
“Shells are often more conical, and have a wider umbilicus than the illustrated ones.” (Vermeulen, 1996)
Vermeulen (1996) original descriptions on Arinia paricostata – “Shell conical with (slightly) convex sides, or more or less (shortly) cylindrical, last whorl widest. Whorls 4 1/8-5 1/8, convex, last whorl moderately convex. Tuba ¼ whorl. Radial ribs double-crested with the distal crest highest (close to the top sometimes a few single-crested), on the top whorls 6-12 ribs/0.5 mm, on the penultimate whorl 3-8 ribs/0.5 mm, towards the last whorl single-crested, above the aperture 4-8 ribs/ 0.5 mm. Spiral striation fine. Umbilicus almost closed to open, up to 0.2 mm wide. Aperture turned slightly to distinctly upwards. Peristome: palatal side distinctly protruding beyond the penultimate whorl, columellar side sinuous or not; outer peristome moderately to widely spreading beyond the inner on the palatal and basal side, (rather) abruptly narrowed on the columellar side and towards the angular edge; inner peristome hardly to distinctly protruding from the outer, spreading, just above the angular edge with a ridge oblique or perpendicular to the margin, at the right side of which a distinct furrow, palatal and basal side without a hp parallel to the margin, Its outer surface and the upper surface of the outer peristome with few lamellae.”
Arinia paricostata – “Height 1.65-2.50 mm: width 1.2-1.4 mm; index 1.4-2.0. Height aperture 0.4-0.5 mm; width 0.4-0.6 mm.” (Vermeulen, 1996)
Type locality – “Borneo. Sabah. Tawau Zone: G. Baturong, 50 km WSW of Lahad Datu” leg. Wilford (Vermeulen, 1996)
Other localities – “Borneo. Sabah. Tawau Zone: NW of road Lahad Datu-Sandakan crossing with Segama R.” leg. Wilford (Vermeulen, 1996); “Borneo. Sabah. Tawau Zone: G. Madai, 40 km SSW. Of Lahad Datu.” leg. Wilford (Vermeulen, 1996); “Borneo. Sabah. Tawau Zone: Batu Tenggar, Segarong Hills 25 km ESE of Kunak” leg. Wilford (Vermeulen, 1996)