Trichocathaica goepeliana Yen, 1938

Pall-Gergely, Barna, unyadi, Andras & Asami, Takahiro, 2018, Enantiomorphs and taxonomy of three conchological species in flat-shelled snails Trichocathaica (Pulmonata, Camaenidae), ZooKeys 810, pp. 19-44 : 29-30

Trichocathaica goepeliana Yen, 1938 Figure 9

Trichocathaica goepeliana - Yen 1939: 150, plate 15, fig. 45.

Material examined.

W-Sy-tschuan: Tapa, coll. Möllendorff ex Potanin 444, SMF 8939/2 (syntypes).

Diagnosis.

Shell sinistral, small, body whorl keeled at the middle of body whorl, teleoconch finely wrinkled with small scales.

Description.

Shell small, sinistral, spire elevated, dorsal surface domed/conical; body whorl bluntly keeled, keel situated at about mid part of body whorl; shallow subsutural furrow present on body whorl above keel; protoconch consists of 1.5 whorls, finely pitted and wrinkled; entire shell with 5.5-5.75 whorls; teleoconch finely, irregularly wrinkled, with fine, curved scales (present near suture); aperture subcircular, peristome not developed in the two available specimens.

Measurements (in mm).

D = 9.5-9.6, H = 5.7-6.1 (n = 2).

Differential diagnosis.

This species is smaller than the other congeners, and its keel is situated in the middle of the body whorl.

Distribution.

This species is known from the type locality only. We were not able to determine the locality Tapa on the map among more than 20 similarly called localities.

Remarks.

This species differs from the other congeners by its smaller shell; both the available shells are smaller than 10 mm in diameter, whereas the others have shells larger than 15 mm. Though the small scales on the shell surface suggest that this species belongs to the genus Trichocathaica , due to its small shell size, its generic placement needs to be verified by examination of genital morphology.