CLASSIFICATION OF LIMNAEA (POND SNAIL)
KINGDOM :- ANIMALIA (Multicellular eukaryotic organisms)
PHYLUM :- MOLLUSCA (Unsegmented bilaterally symmetrical and provided with visceral mass, foot and mantle.)
CLASS :- GASTROPODA (Head bearing tentacles, eyes and radula; visceral hump and shell coiled due to torsion.)
SUB-CLASS :- EUTHYNEURA (Nerve loop not twisted in figure of 8.)
ORDER :- PULMONATA (Air-breathing forms.)
SUB-ORDER :- BASOMMATOPHORA (Eyes at the base of tentacles.)
FAMILY :- LYMNAEIDAE (Large air-breathing freshwater snails)
GENUS :- Limnaea
It is found in the northern states form Atlantic to Pacific, Europe, New England to Kansas, California, and the entire Pacific coast.
HABIT AND HABITAT
Limnaea is a typical fresh· water snail, found in ponds, lakes, etc.
GENERAL CHARACTERSTICS OF LIMNAEA (POND SNAIL)
- Commonly called as pond snail.
- Shell is thin, horny and fragile with a sharply elongated spire.
- Body whorl is the largest, while the penultimate whorl and apex are smaller.
- Body whorl opens by a wide aperture which is covered by operculum.
- Eyes are placed at the base of the single pair of flattened tentacles. The tentacles cannot be invaginated.
- Foot is rounded behind. Species of Limnaea are quite resistant to freezing. They can survive for several weeks in ice.
The animal contains elongated spire and all above features, hence it is Limnaea.