Bensonella wangviangensis

Bensonella wangviangensis (Panha & Tongkerd, 2003) Figs 103 D, 106, 107 Paraboysidia wangviangensis Panha & Tongkerd in Panha et al. 2003: 123–128, figs 2–3. Paraboysidia wangviangensis — Inkhavilay et al. 2019: 62. Type material examined. Laos • 1 paratype; from the type locality; 1998; S. Panha leg.; CUMZ ver. 089. Type locality. “ Tam Chang Cave, Wangviang, Laos, 18°54′47″N, 102°26′33″E, 140 meters elevation … ” (Laos). Differential diagnosis. This species differs from B. cardiostoma sp. nov. and B. mitochondria sp. nov. by the more elongated shell, larger size as well as depressed and more elongated aperture. Additionally, B. cardiostoma sp. nov. is not spirally striated. Apart from the clearly smaller size, this species can further be separated from B. fracta sp. nov. by the shouldered last whorl, which is rounded in B. fracta sp. nov. Distribution. This species is known only from the type locality. Remarks. We examined the types of this species and could add several notes to the original description. This species is originally described as having six apertural barriers (angular, parietal, infraparietal, two upper palatals and a lower palatal). From the Fig. 106, it can be clearly seen that there are eight barriers, the ones already described and additionally one interpalatal and a columellar lamella. The “ second upper palatal plica ” from the original description is in the position of usually mentioned palatal tubercle (typical for Bensonella), although it does not look like a tubercle but more like a proper lamella. Nevertheless, we treat them homologous.