Nutritional Freshwater Life
126
Description: Shells of this species have
a shell length of 26.5–43.5 mm. Shell is
globose, yellowish brown with darker
spiral bands. Its spire is much less than
the height of the aperture. The presence of a gill, accessory lung sac inside
the mantle cavity, and anterior kidney
chamber is the characteristic feature
that helps this species to adapt to an
amphibian life (Brown, 2002; arnobrosi.
tripod.com/snails/lanistes.html).
Pomacea bridgesii Reeve 1856
Order: Architaenioglossa
Family: Ampullariidae
Common name: Golden apple  snail,
common apple snail, golden mystery
snail.
Distribution: Paraguay, Brazil, and
Bolivia (Pastorino and Darrigan, 2011).
Habitat: Lakes and rivers.
Description: Shell of this species has
five or six whorls. Most obvious characteristic features of the shell are
the  square shoulders  (flat at the top
of the whorls) and almost  90° sutures.
Shell opening (aperture) is large and
oval and the umbilicus is large and
deep. Size of the shell varies from 40 to
50 mm wide and 45 to 65 mm high.
Spire is high and sharp. They are the
most colorful of all apple snail species,
ranging in color from the wild brown,
gold, albino, chestnut to blue, jade, and
even shades of purple and burgundy,
with or without stripes. Operculum is
moderately thick and corneous. The
color of the operculum varies from
light to dark brown. The operculum
can be retracted in the aperture (shell
opening) (http://www.applesnail.net;
http://www.petfish.net).
Pomacea canaliculata Lamarck 1819