Diplommatina maipokhariensis Budha & Naggs,

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: 12

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Diplommatina maipokhariensis Budha & Naggs

sp. nov.

Diplommatina maipokhariensis Budha & Naggs  sp. nov.


Figs 4CView Fig, 9FView Fig


Measurements (n = 6): SH 2.4–2.5 mm, SW 1.1–1.2 mm, Wh 7.2–7.5; holotype: SH 2.5 mm, SW 1.1 mm, Wh 7.5. Dextral, penultimate and body whorls nearly equal in width. Constriction at the inner edge of the parietal wall of the lip ( Fig. 9FView Fig). Parietalis long and distinct ( Fig. 4CView Fig 3View Fig). Two vertical palatalis: Vpt1 distinct and strong, running along the constriction; Vpt2 thin, running parallel to Vpt1. Two horizontal palatalis running closely together giving the impression of a single lamella above the columella ( Fig. 9FView Fig). Columellaris prominent. Columellar tooth distinct. Protoconch smooth, Wh approx. 2.0, with very distinct pits, without radial ribs ( Fig. 4CView Fig 1View Fig). Teleoconch with widely spaced strong radial ribs, evenly distributed on the penultimate and body whorls; about 4–6 ribs/ 0.5 mm ( Figs 4CView Fig 2View Fig, 4C4View Fig). Fine spiral striation present. Umbilicus closed. Aperture circular. Peristome with two widely spaced lips; 6–8 ribs between the lips ( Fig. 4C4View Fig). Both lips slightly reflected.


The species name refers to the type locality of Maipokhari, one of the Ramsar sites of Nepal.

Type material


NEPAL: Maipokhari , Ilam, 2030 m, Cryptomeria  forest, 27.001111 N, 87.92222 E, 25 Dec. 2010, P.B. Budha leg. ( CDZMTU034).



NEPAL: 10 shells from the type locality, same data as holotype ( CDZMTU 035).


The shell of Diplommatina maipokhariensis  sp. nov. looks intermediate between the Philippine species D. concolor Quadras & Möllendorff, 1893  ( Zilch 1953: p. 28, fig. 156) and the Burmese (= Myanmar) species D. exilis W.T. Blanford, 1863  ( Hanley & Theobald 1876: pl. 119, fig. 10). Yet, it differs from both these species by its broader whorls. Diplommatina exilis  also differs from D. maipokhariensis  sp. nov. in the more slender shell and the absence of spiral striations.

Another slender species is D. exserta Godwin-Austen, 1886  (pl. 49, figs 2, 2a), which is larger and lacks a prominent constriction. The most similar species is D. pullula Benson, 1859  from Darjeeling, but D. maipokhariensis  sp. nov. has stronger radial ribs and a smaller shell (SH <2.5 mm) than D. pullula  (SH> 3 mm).