Endothyrella dolakhaensis 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 : 27

Taxon classification Animalia Pulmonata Plectopylidae

Endothyrella dolakhaensis Budha & Pall-Gergely sp. n. Figures 9 G–H, 14A

Type material.

Nepal, Suridobhan, Dolakha, 1023 m, 27.758852°N, 86.197894°E, leg. Budha, P., 03.02.2009., holotype (CDZMTU001, Figure 14A), CDZMTU002 (2 paratypes = shells from the same locality); Nepal, Bhorle, Dolakha, 800 m, 27.696652°N, 86.129583°E, leg. Budha, P., 03.02.2009., 11 paratypes = shells (CDZMTU003).

Diagnosis.

Shell small with rather conical dorsal surface; body whorl slightly angulated with five rows of hairs; parietal lamella simple with one or two denticles posteriorly and a plica below; middle palatal plicae divided or almost divided.

Description.

Shell very small, sinistral, with somewhat elevated spire and rather conical apex; protoconch elevated from the dorsal surface; colour brownish or greyish; protoconch conspicuously large, consists of 2.25-2.5 whorls (n = 2), 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 five spiral lines along the body whorl; whorls 5.25-5.5 (n = 3) moderately bulging, separated by relatively deep suture; umbilicus wide and deep; apertural lip whitish, thin, slightly reflexed; callus also very weak, slightly S-shaped; no fold in the aperture.

One specimen from the type locality was opened. Parietal wall with one rather straight lamella with slight lower arms pointing in both directions; small denticle near the upper end posteriorly, connected to the lamella; two short horizontal plicae under the lamella; palatal wall with six plicae; first slim and short, the second-fifth plicae are divided in the middle and are of the same length; last plica also short, rather straight (Figures 9 G–H).

Measurements

(in mm): D: 6.5-9.0, H: 4.0-5.0., Wh: 5.5-6.0 (n = 5).

Differential diagnosis.

The most similar species are Endothyrella affinis and Endothyrella plectostoma , which are larger, have a higher spire, and a deeper, narrower umbilicus. Endothyrella dolakhaensis sp. n. has a more elevated spire and more rounded body whorl than Endothyrella angulata sp. n. Moreover, Endothyrella dolakhaensis sp. n. has five rows of periostracal folds, whereas Endothyrella angulata sp. n. has four. See also under Endothyrella macromphalus , Endothyrella minor and Endothyrella nepalica sp. n. and Table 5.

Etymology.

The new species is named after the district name (Dolakha).

Type locality.

Nepal, Suridobhan, Dolakha, 1023 m, 27.758852°N, 86.197894°E.

Distribution.

Endothyrella dolakhaensis sp. n. is known from two localities in the valley of the Tamakoshi River, Dolakha district, Central Nepal (Figure 15).