Taxon classification Animalia Pulmonata Plectopylidae

Endothyrella miriensis (Gude, 1915) Figure 12C

Endothyrella miriensis 1915 Plectopylis (Endothyra) miriensis Gude: Records of the Indian Museum, 8: 507-508, Plate 41, figs 3 a–d . ["Miri Hills, Upper Assam"].

Types.

Miri Hills, leg. C.F.G. Oakes, R.E., NHMUK 1903.7.1.3205. (4 syntypes, Figure 12C)

Diagnosis.

Shell small, sinistral, with very slightly elevated spire, relatively wide umbilicus, and conspicuous spiral sculpture; callus moderately strong, palatal plicae slightly oblique, connected by a vertical ridge; lamella almost straight, with anteriorly elongated upper and lower ends and small denticles on the posterior side, one above and one below.

Measurements

(in mm): D: 12.1-12.3, H: 5.3-5.4 (n = 2, type series).

Differential diagnosis.

The unique spiral sculpture, which is very prominent on the ventral side as well, distinguishes Endothyrella miriensis from all congeners. See also Table 5.

Distribution.

The species is known from the type locality only (Figure 10).