Diplommatina syabrubesiensis Budha & Backeljau sp. nov.

urn:lsid:zoobank.org:act: 1CFD0C16-38F3-489C-9A86-945A6475250B

Figs 8C, 9O

Diagnosis

Measurements (n = 11): SH 2.9–3.2 mm, SW 1.4–1.5 mm, Wh 6.5–7.0; holotype: SH 3.2 mm, SW 1.5 mm, Wh 7.0. Dextral, whorls regularly increasing, penultimate whorl slightly wider than the body whorl, suture impressed, constriction nearly at the middle in front of the parietal wall (Fig. 9O). One weak parietalis (Fig. 8C 3). One vertical palatalis. Horizontal palatalis absent (Fig. 9O). Columellaris moderate, weak towards the aperture. Protoconch smooth, with minute pits evenly distributed, radial ribs absent (Fig. 8C 1). Teleoconch with distinct radial ribs; 9–11 ribs/ 0.5 mm on the penultimate whorl; 13–16 ribs/ 0.5 mm on the body whorl towards the aperture. Dorsal fold present, but weakly developed (Fig. 8C 2, C 4). Spiral striation present, but hardly visible. Umbilicus closed. Aperture circular; parietal wall thick, raised and slightly oblique with regard to the coiling axis. Peristome with two slightly spaced lips; angular edge of the peristome straight; palatal lip rounded; basal lip along the columellar margin slightly curved; inner lip slightly thickened and forming a thick callus over the parietal wall. Operculum paucispiral, Wh 2.5, outer whorl comparatively wide.

Etymology

The species name refers to the type locality ‘Syabrubesi’.

Type material

Holotype

NEPAL: Syabrubesi, above Lama Hotel, Langtang National Park, 2635 m, 28.197564 N, 85.455117 E, 13 May 2008, P.B. Budha leg. (CDZMTU051).

Paratypes

NEPAL: 7 shells from the type locality, same data as holotype (CDZMTU 052); 27 shells, Dhunche, Langtang National Park, 2056m, 28.108942 N, 85.291547E, 3Jun. 2007, P.B. Budha leg. (CDZMTU 053); 2 shells, Baghdwar-Deurali trek, Shivapuri-Nagarjun National Park, 2406 m, 27.803775 N, 85.38872 E, 25 Apr. 2008, P.B. Budha leg. (CDZMTU 054).

Remarks

The shell of D. syabrubesiensis sp. nov. is similar to that of D. fistulata sp. nov. However, the peristome of D. fistulata sp. nov. is highly tilted towards the left on the inner wall of the parietal lip on the columellar axis, while it is round in D. syabrubesiensis sp. nov. Moreover, D. fistulata sp. nov. has a strong dorsal fold, which is not distinct in D. syabrubesiensis sp. nov and only visible through careful observation (see Fig. 8C 4).