Viviparidae, Gray, 1847

Jindal, Rajinder & Wats, Meenu, 2021, Systematic descriptions and seasonal variations of mollusc in Chandigarh (U. T., India) and its surrounding freshwater bodies, International Journal of Fisheries and Aquatic Studies 9 (3), pp. 165-173 : 169

Family: Viviparidae

Viviparidae is a family of freshwater, operculate snails from rivers, ponds and lakes. The shells of this family are thick, globose, and dextral with size varying from medium to large. They live in still or slow moving waters and are usually nocturnal. The members of this family are found amongst vegetation, in sand or mud. Many species during drought conditions burrow themselves in mud and seal their operculum.

Filopaludina bengalensis typica (Lamarck, 1822)

Taxonomic description- Shell dextral, operculate, medium sized, conical in outline, yellowish brown colour; number of whorls 6, plano-convex, dark bands spirally arranged, irregular pattern of thick and thin bands; sutures impressed; body whorl evenly convex, greatly swollen; penultimate whorl broad; spire pointed, height equal to body whorl; aperture sub circular with narrow black margin; umbilicus widely open; operculum horny, deep brown, eccentric nucleus, deep red area around the nucleus; columellar callus developed; inner peristome clearly visible, thick rim like, not fused with body whorl, outer peristome thick.

Filopaludina bengalensis mandiensis (Lamarck, 1822)

Taxonomic description- Shell dextral, operculate, medium sized, more conical than typica, greenish brown colour, number of whorls 6, more convex than typica, broad and narrow dark spiral bands arranged alternately; sutures less impressed than typica; body whorl evenly convex; penultimate whorl less broader than typica; spire with pointed apex, height almost equal to body whorl; aperture ovoid; operculum horny, deep brown, eccentric; umbilicus narrowly open; columellar callus well developed; inner peristome not distinct, thin fused with body whorl, outer peristome thin.

Idiopoma dissimilis (Müller, 1774)

Taxonomic description- Shell dextral, operculate, ovately conical, small, dirty olive green coloured; spire broadly conical and swollen; sutures deeply impressed; whorls inflated, number of whorls four and half; body whorl with slightly elevated ridge, without dark spiral bands; aperture ovate; umbilicus narrow; operculum thick.