Opisthostoma trapezium van Benthem Jutting, 1952

Foon, Junn Kitt, Clements, Gopalasamy Reuben & Liew, Thor-Seng, 2017, Diversity and biogeography of land snails (Mollusca, Gastropoda) in the limestone hills of Perak, Peninsular Malaysia, ZooKeys 682, pp. 1-94 : 2

Opisthostoma trapezium van Benthem Jutting, 1952 Figure 14C

Materials examined.

Prk 47 Kanthan: BOR/MOL 9071, BOR/MOL 9164. mykarst-027: BOR/MOL 9035, BOR/MOL 9126. Prk 53 Hill KF: BOR/ MOL 10780 .mykarst-025: BOR/MOL 9397, BOR/MOL 9421, BOR/MOL 9489, BOR/MOL 9515 .

Distribution.

Restricted to central and upper Kinta Valley only.

Remarks.

Distinguished from congeners by its box-like shell shape, pronounced but widely spaced radial ribs and the direction the aperture is facing is parallel to the coiling axis of the apical whorl. Previously known from Gunung Kanthan only ( Maassen 2001).

Figures

Figure 14. A Opisthostoma paulucciae (( Crosse and Nevill, in Crosse, 1879 b )) BOR / MOL 9019. Perak, Ipoh, Gunung Kanthan B Opisthostoma ' tempurung 1 detached' BOR / MOL 12504. Perak, Ipoh, Gunung Tempurung Plot 4 C Opisthostoma trapezium van Benthem Jutting, 1952 BOR / MOL 9035. Perak, Ipoh, Gunung Kanthan D Opisthostoma vermiculum Clements and Vermeulen, in Clements et al., 2008 BOR / MOL 10242. Perak, Ipoh, Gunung Rapat.