Diplommatina syabrubesiensis Budha & Backeljau,

Budha, Prem B., Naggs, Fred & Backeljau, Thierry, 2017, The genus Diplommatina Benson, 1849 (Gastropoda: Caenogastropoda: Diplommatinidae) in Nepal, with the description of seven new species, European Journal of Taxonomy 337, pp. 1-30: 22-23

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Diplommatina syabrubesiensis Budha & Backeljau

sp. nov.

Diplommatina syabrubesiensis Budha & Backeljau  sp. nov.


Figs 8CView Fig, 9OView Fig


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. 9OView Fig). One weak parietalis ( Fig. 8CView Fig 3View Fig). One vertical palatalis. Horizontal palatalis absent ( Fig. 9OView Fig). Columellaris moderate, weak towards the aperture. Protoconch smooth, with minute pits evenly distributed, radial ribs absent ( Fig. 8CView Fig 1View Fig). 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. 8CView Fig 2View Fig, C 4View Fig). 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.


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

Type material


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



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).


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. 8CView Fig 4View Fig).