Sigatica pomatiella ( Melvill, 1893 )

Tudu, Prasad Chandra & Balakrishnan, S., 2020, Short Communication Range extension of Sigatica pomatiella (Melvill, 1893) (Naticidae: Littorinimorpha) to northern east coast of India, Records of the Zoological Survey of India 120 (2), pp. 201-202 : 201-202

Sigatica pomatiella ( Melvill, 1893) ( Fig.1 , a-c)

1893. Naticina pomatiella Melvill, Mem. Manchr. Soc. 62; Pl. 1, fig. 18.

1985. Eunaticina pomatiella : Mookherjee, Rec. zool. Surv. India, Occ.

Paper 75: 6.

2016. Polinices (Sigatica) pomatiella : Dey, Catalogue of marine molluscs,

239; fig. 539 -540.

Diagnosis: Shell medium size, height 12.45 - 13.55 mm and width 10.15 - 11.10 mm, narrow but deeply umbilicated, apparently smooth and white; suture deep; mouth simple. The transverse groove may not be visible by naked eye but distinguishable under the microscope. It has 7-10 striae in the subsutural and umbilical regions; umbilical callus narrow, which never extends over the umbilicus ( Kabat, 2000). Colour of the shell whitish inside and outside, operculum reddish brown.

Distribution: Bombay [ Mumbai] (type locality), Maharashtra (Melvill, 1983), Tamil Nadu ( Mookherjee, 1985; Dey, 2016), Odisha (Present collection).

Figures

Figure 1. a-c:Sigatica pomatiella (Melvill, 1893) (Height 12.45mm and width 10.15mm).