Pincerna thompsoni (Godwin-Austen, 1914)

Pall-Gergely, Barna, Sajan, Sheikh, Tripathy, Basudev, Meng, Kaibaryer, Asami, Takahiro & Ablett, Jonathan D., 2020, Genus-level revision of the Alycaeidae (Gastropoda, Cyclophoroidea), with an annotated species catalogue, ZooKeys 981, pp. 1-220 : 1

Pincerna thompsoni (Godwin-Austen, 1914)

Alycaeus (Cycloryx) thompsoni Godwin-Austen, 1914: 404, pl. 146, figs 3, 3a.

Alycaeus (Cycloryx) thompsoni - Gude 1921: 285.

Cycloryx thompsoni - Ramakrishna et al. 2010: 74.

Type locality.

“Munipur”.

Material examined.

Munipur, coll. Godwin-Austen, NHMUK 1903.7.1.2550 (1 syntype).

Remarks.

Entire shell somewhat weathered; protoconch matte; R1 regularly, densely ribbed, spiral striation not visible, but additional, lower radial lines present between the ribs; R2 very short, ca. five ribs, similar to those on R1 in density.

This species may be conspecific with P. graphicus var. dihingensis because there is only a slight difference in the density of ribbing (coarser and more oblique in thompsoni ). Pincerna thompsoni has a completely closed umbilicus, but due to the lack of large shell material we are unable to determine whether this represents individual variability or a stable character. Alternatively, the closed umbilicus may be a feature of more mature (more developed) specimens.