Bouchetcamaena fusca Pall-Gergely sp. nov.

Figure 12

Type material.

Holotype: Munipur [India, Manipur], coll. Godwin-Austen, NHMUK 1903.7.1.391/2 (D: 16.8 mm, H: 8 mm, mixed lot with B. delibrata, NHMUK 1903.7.1.391/1).

Paratypes: same data as holotype, NHMUK 1903.7.1.391/3 (1 shell: paratype); Gaziphima, Naga Hills, Munipur frontier line, coll. Godwin-Austen, NHMUK 1903.7.1.385 (2 paratypes); Khasi Hills, coll. Godwin-Austen, no. 183, NHMUK 1903.7.1.381a/2 (1 shell, mixed lot with B. delibrata, NHMUK 1903.7.1.381a/1); Manipur, coll. Godwin-Austen, NHMUK 20191134 (1 shell).

Diagnosis.

Shell small to medium-sized, with flat dorsal side or very slightly elevated spire; thick, brown, matt periostracum makes hair scars practically invisible, aperture oval.

Description.

Shell small to medium-sized; depressed-globular, dorsal side flat or spire very slightly elevated; body whorl slightly or relatively strongly but bluntly shouldered; colour brownish due to thick, matt periostracum; protoconch consists of 1.5 whorls, finely wrinkled, with short hairs near suture; in some specimens wrinkles only visible in the middle of whorls, whereas in others hair scars (pits) are also discernible; entire shell consisting of 3.75-4 whorls, suture moderately deep; short hairs visible in the suture and inside umbilicus; hair scars practically invisible due to thick periostracum; in one paratype (NHMUK 1903.7.1.391) periostracum of lighter colour around each hair scar on the ventral side, making the density of scars visible; very few hair scars visible at the parietal callus, but to a much lesser degree than in other species; aperture oval/subrectangular; peristome expanded and slightly reflected in direction of umbilicus; palatal part with a very thin, whitish, semi-transparent layer; hair scars not visible beneath parietal callus; umbilicus open, relatively narrow, peri-umbilical keel only very slightly indicated.

Measurements.

D = 15.3-18.7 mm, H = 7.8-8.8 mm (n = 5).

Differential diagnosis.

Bouchetcamaena raripila sp. nov. is most similar to B. fusca sp. nov. in having a relatively small shell, narrow umbilicus and brown periostracum, but it differs in the strong, sparsely standing hair scars. All other Bouchetcamaena species have larger, lighter-coloured shells and a wider umbilicus.

Etymology.

The new species is named after its dark (fuscus in Latin) periostracum.

Distribution.

Seems to be restricted to Manipur, the Khasi and the Naga Hills (India).