Endothyrella angulata Budha & Pall-Gergely

Pall-Gergely, Barna, Budha, Prem B., Naggs, Fred, Backeljau, Thierry & Asami, Takahiro, 2015, Review of the genus Endothyrella Zilch, 1960 with description of five new species (Gastropoda, Pulmonata, Plectopylidae), ZooKeys 529, pp. 1-70 : 19-21

Taxon classification Animalia Pulmonata Plectopylidae

Endothyrella angulata Budha & Pall-Gergely sp. n. Figures 9 I–J, 14B

Type material.

Nepal, Taubas, Bhainse, Makwanpur District, 27°492521'N, 85°04839'E., leg. Budha, P., 30.03.2012., holotype (CDZMTU018, Figure 14B); 3 paratypes and 2 juvenile shells (not paratypes) (CDZMTU019).

Diagnosis.

Shell small, sinisttral, with flat dorsal surface and shouldered (keeled) body whorl; hairs are arranged in four rows; parietal lamella simple with a short free horizontal plica below it, and two denticles posterior to the lamella which are in contact with the lamella; middle palatal plicae divided.

Description.

Shell sinistral, semi-transparent; protoconch elevated from the flat dorsal surface; colour brownish or greyish; protoconch conspicuously large, consists of 2.5, 2.75 whorls, very finely, regularly ribbed; teleoconch with clearly visible reticulated sculpture dominated by radial growth lines; sculpture somewhat weaker on the ventral surface; very slender, long periostracal folds (hairs) standing in four spiral lines along the body whorl; two closely adjacent rows running with the keel above, one row on the ventral side around the umbilicus, and one row approximately in the middle line of the body whorl; whorls 6.25 (holotype) moderately bulging, separated by relatively deep suture; umbilicus wide and deep; peristome thin, slightly reflexed; callus moderate; no fold in the aperture.

One specimen was opened. Palatal wall with a single, straight lamella, with two short denticles on the posterior side of the lamella, both are in contact with the lamella; a short, free horizontal plica is visible under the lamella; palatal wall with six plicae, first straight, last slightly curved, the middle plicae are divided in the middle, the fragments are horizontal, oblique or Z-shaped (Figure 9 I–J).

Measurements

(in mm): D: 8.5, H: 3.5 (holotype); D: 5.5, H: 2.5, Wh: 5 (paratype; subadult specimen).

Differential diagnosis.

See under Endothyrella dolakhaensis sp. n., Endothyrella minor , Endothyrella nepalica sp. n., Endothyrella pinacis and Table 5.

Etymology.

The Latin angulatus (cornered, angular) refers to the shouldered/angulated body whorl of the new species.

Type locality.

Nepal, Taubas, Bhainse, Makwanpur District, 27°492521'N, 85°04839'E.

Distribution.

Endothyrella angulata sp. n. is known only from the type locality (Figure 15).