Freshwater Molluscs of India: An Insight of into Their Diversity, Distribution and Conservation - Aquatic Ecosystem: Biodiversity, Ecology and Conservation - page 178

Camptoceras subspinosum (Annandale
and Prashad)

Shell with strong spiral; whorls 4, suture not
impressed and to angular at the margin, spiral
lines subspinose

Large lakes with rich vegetation Kashmir

Camptoceras terebra (Benson) Shell elongated, at least 3 times as long as

broad, sculpture without strong spiral lines

Large lakes with rich vegetation Uttar Pradesh, West Bengal:

Mogra (Hugli Dist)

Segmentina ( Polypylis ) calatha (Benson) Shell conoidal, whorls rapidly increasing in

size, side of the keel rounded

Common species of swamps, ponds, lakes and
wetlands, in decaying plant and leaf-litter

Kashmir, Gangetic plain;
widely distributed in northern
India and Tripura

Segmentina ( Polypylis ) taia (Annandale
and Rao)

Shell more conoidal, whorls gradually
increasing in size, side of the keel forming a
small angle

Lakes, large stagnant water bodies Andaman: Port Blair

Segmentina ( Polypylis ) trochoidea
(Benson)

Shell small, trochoid, whorls 3 ½, periphery
more acute, umbilicus small or absent

Rare species of stagnant waters, lakes, lakes,
ponds in submerged dense vegetation

Karnataka, Tamil Nadu, West
Bengal

Hippeutis fontanus (Lightfoot) Shell small, lenticular, much drepressed,

paucispiral; whorls very rapidly increasing,
carinate; aperture obliquely heart shaped

Common species of swamps and wetlands, on
macrophytes

Kashmir

Hippeutis ( Helicorbis ) umbilicalis
umbilicalis (Benson)

Body whorl being abruptly wide, round, convex
above, fl attened below, bluntly angulate at the
periphery, aperture heart shaped

Occur in ponds, lakes, swamps amidst dense
vegetation

Assam, Bihar, Manipur, Uttar
Pradesh: Kumaon Lake, West
Bengal

Indoplanorbis exustus (Deshayes) Shell large, thick, discoidal, sinistral, rounded

at periphery, aperture ear shaped, suture deeply
impressed

Occur in wetlands, ponds, lakes, swamps,
ditches, amidst dense vegetation

Widely distributed

Ferriss ia baconi (Bourguignat) Apex blunt refl ected to the right It is occasionally found attached on stones or

wooden material in a few lowland streams in
the Ganga river

Bihar, Orissa, West Bengal

Ferrissia ceylanica (Benson) Apex sharply pointed, very little refl ected Lakes Manipur: Imphal

Ferrissia tenuis (Bourguignat) Shell minute, thin opaque, fragile, sculptured

smooth, aperture oblong; brown or blackish
externally, dull yellow internally

Attached to stones, pebbles or fl oating objects
in river streams with moderate fl ow. Breeds in
the month of January. Eggs are laid singly on
decaying leaves, etc., in a gelatinous mass

Nilgiri Hills, Maharastra

Ferrissia verruca (Benson) Shell suboval, small, thin, outline asymmetrical

bilateral. Apex blunt, not elevated, blackish in colour

Found on fl oating stems, water plants and
leaves in pond

Throughout India

Ferrissia viola (Annandale and Prashad) Surface smooth with thin minute rugulose

deposit. Dark brown or blackish in colour

Found on the lower side of fl oating grass stems
in a small sluggish muddy stream

Manipur: Bishenpur,
Nagaland: Dimapur

Paracrostoma tigrina (Kohler and
Glaubrecht) ( 2007 )

Data not available Hill streams Western Ghats

(continued)