Nodopomatias sibbumensis ( Godwin-Austen, 1917 )

Páll-Gergely, Barna, Fehér, Zoltán, Hunyadi, András & Asami, Takahiro, 2015, Revision of the genus Pseudopomatias and its relatives (Gastropoda: Cyclophoroidea: Pupinidae), Zootaxa 3937 (1), pp. 1-49 : 19-20

Nodopomatias sibbumensis ( Godwin-Austen, 1917)

Fig. 8 F

Eupomatias sibbumensis Godwin-Austen, 1917 : p. 579. Nodopomatias sibbumensis — Gude 1921: p. 162.

Diagnosis. A large, turriform species with widened peristome margin consisting of two well-separated circles and a basal keel situated close to the umbilicus.

Description. The three shells available for study were corroded; therefore the shell colour and the fine sculpture of the protoconch could not be observed. It was visible however on the figured syntype, that the first whorl of the protoconch was not ribbed. Shell turriform, widest at its base; the 7.5–8.25 (n=2), rather flat whorls are separated by shallow suture; ribs are regular on the whole shell; the holotype is the only shell with a complete aperture and neck region, but it has a scar (cicatrice) on the neck, therefore the sculpture behind the aperture could not be described properly; basal keel with blunt ribs; keel starts behind the aperture (a bit left from the most basal point), and ends behind the columellar-basal transition of the aperture; aperture round with slight upper incision (parietal-palatal transition); columellar-parietal transition not angled; peristome is very slightly reflexed; it consists of two circles, a wider outer and a very thin inner; the boundary between these is well visible from lateral view.

Measurements (in mm). H: 14.5, D: 5.8 (n=1).

Differential diagnosis. See under Nodopomatias oakesi .

Type material. Sibbum, Abor Hills, leg. Oakes, Godwin-Austin Collection, NHMUK 1903.7.1.3146 (3 syntypes).

Distribution. Nodopomatias sibbumensis is known from the type locality only (see also Fig. 2 and Table 3 ).

Figures

FIGURE 2. Different areas of north-eastern India mentioned in the text. See also Table 3. 1: Sikkim, 2: Aka Hills, 3: Garo Hills, 4: Khasi Hills, 5: Dafla Hills, 6: Abor Hills, 7: Naga Hills.

FIGURE 8. A. Csomapupa luyorensis (Godwin-Austen, 1917), syntype, NHMUK 1903.7.1.3377; B. Cs. grandis (Godwin- Austen, 1876), syntype, NHMUK 1903.7.1.3438; C. Vargapupa oharai n. sp., holotype, HNHM 98837; D. Vargapupa biheli n. sp., holotype, MNHN 2012 – 27020; E. Nodopomatias oakesi (Godwin-Austen, 1917), syntype, NHMUK 1903.7.1.3086; F. Nodopomatias sibbumensis (Godwin-Austen, 1917), syntype, NHMUK 1903.7. 1.3146. Photos: A – B, E, F: H. Taylor; C – D: B. Páll-Gergely. Scale bars = 5 mm; the smaller one refers to the photos of the whole shell, the larger one refers to the photos showing the lateral and basal side of the shells.