Freshwater Molluscs of India: An Insight of into Their Diversity, Distribution and Conservation - Aquatic Ecosystem: Biodiversity, Ecology and Conservation - page 182

Parreysia ( Radiatula ) olivaria (Lea) Shell small, thin, devoid of any sculpture;

umbon prominent and middle; olive green
colour

River bed Assam, Meghalaya, Uttar

Pradesh, West Bengal

Parreysia ( Radiatula ) pachysoma
(Benson)

Shell more elongate, infl ated; umbon
pronounced, with much stronger hinge, radial
sculpture absent.

River bed Andhra Pradesh, Assam,

Meghalaya, Orissa, West
Bengal

Parreysia ( Radiatula ) shurtleffi ana (Lea) Shell having some typical sculpture on umbonal

region and on anterior slope.

River bed Bihar, Madhya Pradesh,

Maharashtra, Orissa, Uttar
Pradesh

. Parreysia ( Radiatula ) theobaldi (Preston) Shell broad and elongate; sculpture absent on

dorsal surface

River bed Assam, Manipur

Trapezoideus exolescens exolescens
(Gould)

Shell thin, trapezoidal, brownish yellow,
compressed, umbones depressed, anterior end
narrow, short, posterior side dilated, posterior
wing not distinct

River bed Assam, Manipur, Mizoram,

Nagaland

Pseudomulleria dalyi (E.A. Smith) Shell irregularly quadrate, periostracum deep

brown or blackish brown, nacre mixture of
white, greenish, bluish, olive and pinkish,
margin olive brown

Streams Western Ghats (Karnataka

and Maharashtra)

Neosolen aquaedulcioris (Ghosh) Shell thin, elongated; anterior end truncated,

posterior end rounded, one small long cardinal
tooth in the right valve, anterior adductor scar
long, triangular, posterior small, rounded

Lakes of tidal infl uence and Gangetic delta Orissa: Chilka Lake, West

Bengal: Sundarbans

Tanysiphon rivalis (Benson) Shell small, thin elongately ovate with greenish

periostracum; umbo anterior; ligament short
external; hinge with three cardinal teeth in each
valve; anterior twp smaller and posterior fl attened

Gangetic delta West Bengal: River Ganges

Novaculina gangetica (Benson) Shell oblong with truncated extremities,

periostracum olivaceous

Rivers Ganges West Bengal: River Ganges

Corbicula annandalei (Prashad) Umbon central, prominent, greatly infl ated and

curved forwards, hinge very feeble

Back water of Kerala Known from type locality

only Kerala: Varkala

Corbicula assamensis (Prashad) Shell thin, ovate, anterior short, rounded, posterior

broad and truncate, umbones slightly marked,
striae not deep, shining light yellow colour

Brahmaputra river bed Assam

Corbicula bensoni (Deshayes) Shell subtrigonal, transversely ovate, thin, striae

fi ne and microscopic

Gangetic river belt Bihar: Bhagalpur; West

Bengal: Kolkata, Hugli, Nadia
(continued)