Boysidia ringens van Benthem Jutting, 1950
“From the related species like Paraboysidia kelantanensis rafflesi and P. k. tenuidentata the new form differs in having a more elaborate mouth armature and spiral striation. From Hypselostoma terae it differs in lacking the peripheral keel of that species, in having an adnate instead of free peristome part and in having a more developed dentition.” (Benthem-Jutting, 1949)
Benthem-Jutting (1949) original descriptions on Boysidia ringens – “Shell small with a moderately high spire and a wide aperture which is not free, but adnate to the penultimate whorl. The first 2-3 whorls are more increasing in breath, the subsequent ones more in height; hence a mamilliform apex is implanted on a subcyclindrical middle part. Reddish-brown, finely striated in spiral direction, with exception of the first 1 ½ whorls which are smooth and polished. The spiral sculture is obliquely crossed by the growth lines. Not transparent. Whorls 6, rounded. Suture rather deep. Umbilicus open, but not wide. Aperture somewhat oblique, widened, containing four large teeth. Parietal and angular lamellae are concrescent. Between the large ones there are three smaller teeth; an interpalatal fold, a basal one and an infraparietal lamella. Peristome continuous, somewhat thickened and broadly expanded, especially on the columellar and parietal side. In the more turreted, cylindrical shells the penultimate whorls is somewhat more bulging out in the lateral profile than the ultimate one. Longitudinal grooves are mostly absent. In some shells weak traces of 2-3 grooves can be observed.”
Boysidia ringens – “Dimensions: Height – 3.0-3.9 mm; Breadth – 2.9-3.3 mm; Height of aperture – 1.5-1.7 mm. (Benthem-Jutting, 1949)
Type locality – “Mount Keriang, Kedah” leg. Benthem-Jutting/1939 (Benthem-Jutting, 1949)