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Stocky pebblesnail
The
stocky
pebblesnail
,
scientific name
Somatogyrus
crassus
, is a
species
of very small
freshwater snail
with a
gill
and an
operculum
, an
aquatic
gastropod
mollusk
in the
family
Hydrobiidae
. This species is
endemic
to
the United
States
. Its
natural habitat
is
rivers
.