Arinia turgida Vermeulen, 1996
“In some populations the variability in size covers the entire size range of the species. Similar to A. simplex, see note under that species. Arinia ascotrochus and A. valkenburgi have a wider umbilicus and a spire with, on average, less convex sides. Arinia borneensis has a wider umbilicus, and has the palatal side of the peristome less distinctly flaring.” (Vermeulen, 1996)
Vermeulen (1996) original descriptions on Arinia turgida – “Shell conical with (moderately) convex sides, or shortly cylindrical, last whorl widest. Whorls 4 1/8-5, convex. Tuba 114-3/8 whorl. Radial ribs single-crested, on the top whorls 4-12 ribs/0.5 mm, on the penultimate whorl 6-14 ribs/0.5 mm, above the aperture with 4-8 ribs/0.5 mm. Spiral striation absent or fine, inconspicuous. Umbilicus closed, or open but shallow, less than 0.10 mm wide, at most 0.05 mm wide at the level of the penultimate whorl. Aperture turned slightly upwards or not. Peristome: palatal side distinctly protruding beyond the penultimate whorl, columellar side sinuous or not; outer peristome slightly to moderately spreading beyond the inner on the palatal and basal side, rather gradually narrowed on the columellar side and towards the angular edge; inner peristome moderately to distinctly protruding from the outer, spreading, just above the angular edge with or without a knob, or a ridge oblique or perpendicular to the margin, at the right side of which often an inconspicuous furrow, palatal and basal side without a lip parallel to the margin, its outer surface and the upper surface of the outer pcristome with few to numerous fine to coarse lamellae."
Arinia turgida – “Height 1.40-2.25 mm; width 0.85-1.40 mm; index 1.5-1.8. Height and width aperture 0.35-0.55 mm.” (Vermeulen, 1996)
Type locality – “Borneo. Sabah. Tawau Zone: Batu Tenggar, Segarong Hills 25 km ESE of Kunak” (Vermeulen, 1996)
Other locality – “Borneo. Sabah. Interior Zone: Lian Cave 12 km N of Keningau” (Vermeulen, 1996); “Borneo. Sabah. Interior Zone: Batu Urun near Sepulot, from deposited at Tenom Agricultural Station” (Vermeulen, 1996); “Borneo. Sabah. Interior Zone: Batu Punggol SE of Sepulot” leg. Dorman (Vermeulen, 1996); “Borneo. Sabah. Interior Zone: Pun Batu approximately 30 km W of Sepulot” (Vermeulen, 1996); “Borneo. Sabah. Sandakan Zone: Bt. Gomantong, 30 km S of Sandakan” leg. Wilford (Vermeulen, 1996); “Borneo. Sabah. Sandakan Zone: limestone hill 7 miles E of Lamag, 3 miles NNW of Laab, near road Lahad Datu-Sandakan, near Kinabatangan R.” leg. Wilford (Vermeulen, 1996); “Borneo. Sabah. Sandakan Zone: Bt. Kolop, 4 miles WSW of Latangan” leg. Wilford (Vermeulen, 1996); “Borneo. Sabah. Sandakan Zone: Batu Putih near road Lahad Datu-Sandakan, near Kinabatangan R,” leg. Wilford (Vermeulen, 1996); “Borneo. Sabah. Sandakan Zone: m 2.5 on former road Suanlamba-Gomantong” leg. Wilford (Vermeulen, 1996); “Borneo. Sabah. Sandakan Zone: Bt. Kuntos, near m 6 on former road Suanlamba-Gomantong” leg. Wilford (Vermeulen, 1996); “Borneo. Sabah. Tawau Zone: G. Madai, 40 km SSW of Lahad Datu” (Vermeulen, 1996); “Borneo. Sabah. Tawau Zone: small limestone outcrop 15 miles NNW of Kalabakan” leg. Wilford (Vermeulen, 1996); “Borneo. Sabah. Tawau Zone: NW. of road Lahad Datu-Sandakan crossing with Segama R.” leg. Wilford (Vermeulen, 1996); “Borneo. Sabah. Tawau Zone: G. Baturong, 50 km WSW of Lahad Datu” leg. Dorman (Vermeulen, 1996); “Borneo. Sabah. Tawau Zone: Bt. Pababola, Segarong Hills 25 km ESE of Kunak” leg. Wilford (Vermeulen, 1996)