Paraboysidia laidlawi (Collinge, 1902)
“From the insufficient description and figure, the affinities of this species cannot be determined. It is of about the size of H. dayanum, but has fewer teeth parietal, columellar, upper and lower palatal, according to the description. Nothing is said of an angular lamella, which should be present if it is related to the bensoniana group. Mr. Collinge's figures are copied. I suspect that the artist slanted the sutures in the wrong direction. The shell may be a Gyliauchen.” (Collinge, 1902)
“A newly collected lot from Gua Che Yatin, Ulu Tembeling, Pahang, May 1953 now brings the clue to this riddle. The sample contained five specimens with 5 teeth (1 angular, 1 parietal, 1 basal, 1 lower and 1 upper palatal) and nine specimens having 2 teeth. The five first-mentioned shells correspond with Collinge’s Hypselostoma laidlawi parietal teeth it must now be classified as Paraboysidia laidlawi.” (Benthem-Jutting, 1961)
Collinge (1891) original descriptions on Hypselostoma laidlawi – “Shell dextral, conical, with last whorl dorsally grooved, surface smooth, deeply umbilicated; whorls 5, regularly increasing; aperture CO-shaped, armature consists of four teeth, a dorsal and a ventral one situated on the upper and lower border of the peristome, and two smaller internal teeth, one on the right and one on the left of the peristomial teeth; peristome thin, slightly reflected. Alt. and diam. 1 millim.”
Hypselostoma laidlawi – “Dimensions (in mm.): Height – 1.4 mm; Width – 1.4-1.5 mm; height of aperture – 0.5-0.6 mm. (Benthem-Jutting, 1961)
Type locality – “Biserat Caves, State of Jalor” (Collinge, 1902)
Other localities – “Gua Che Yatin, Ulu Tembeling, Pahang” leg. Benthem-Jutting/May 1953 (Benthem-Jutting, 1961)
Gua Che Yatim, Pahang, Malaysia.