Csomapupa luyorensis (Godwin-Austen, 1917)

Fig. 8A

Pseudopomatias luyorensis Godwin-Austen, 1917: 578 –579, Fig. 5 b. Pseudopomatias luyorensis — Gude 1921: pp 159–160.

Diagnosis. A large, tumid species with "double" suture, weak, but well-visible low ribs and very much widened peristome consisting of two well-visible circles.

Description. Shell greyish-yellowish, rather spindle-shaped; 7.5 moderately bulging whorls are separated by rather shallow suture; above the suture there is a groove running parallel with it; this is present on the whole shell except for the last quarter of whorl; protoconch consist of about two whorls; the sculpture of the first 0.75–1 whorl is finely granulated, rather glossy, after that it becomes regularly ribbed; teleoconch is regularly, extremely finely ribbed with extremely fine spiral lines; the ribs are very low and are regular even behind the aperture; aperture rounded; none of the transitions (columellar-parietal and parietal-palatal) are angled; peristome very much widened and slightly reflexed, consists of two circles; the inner one is slimmer and protruding, the outer one is much wider and a bit expanded.

Measurements (in mm). H: 11.3, D: 4.8 (n=1).

Differential diagnosis. See under Cs. luyorensis .

Type material. Luyor, Abor Hills, NHMUK 1903.7.1.3377/2 syntypes (one adult and one juvenile shell).

Distribution. Cs. luyorensis is known from the type locality only (see also Fig. 2 and Table 3).