CLASSIFICATION OF ENSIS (RAZOR CLAM)
KINGDOM :- ANIMALIA (Multicellular eukaryotic organisms)
PHYLUM :- MOLLUSCA (Unsegmented bilaterally symmetrical and provided with visceral mass, foot and mantle.)
CLASS :- PELECYPODA OR BIVALVIA (Bivalve shell.)
ORDER :- ADAPEDONTA (Gill filaments united by inter-filament and inter-lamellar junctions.)
FAMILY :- PHARIDAE (Saltwater clams with long, soft, naked bodies)
GENUS :- Ensis (razor clam)
It is found in India and U.S.A. (Labrador to West Coast of Florida).
HABIT AND HABITAT
Ensis is a burrowing animal, found in the sand about low tide mark. It burrows into the sand. It can also swim backwards by jerks of the foot.
GENERAL CHARACTERSTICS OF ENSIS (RAZOR CLAM)
- Commonly called as razor shell or razor clam.
- Animal is covered by thin, equivalve shells, which are slightly bent in the middle with concave dorsal and convex ventral sides.
- Shells are joined together by 2 hinge teeth in right shell and by 3 hinge teeth in left shell valve.
- Shells contain parallel margins and lines of growth and have truncated ends.
- Posteriorly exhalent and inhalent siphons are present.
- Burrowing organ foot is muscular, cylindrical and enormously developed. It is capable of swelling out rapidly and becomes very stiff with the flow of blood. It protrudes from anterior end.
- Pallial line is sinupalliate, i.e. it forms sinuses.
- Muscles are isomyrian. Ctenidia· are paired.
- Sanguinolaria and Solen are the other razor shells having the same features as Ensis. In Solen, shell is very long, subcylindrical straight margins parallel, ends gaping and umbo terminal. The pallial line extending beyond the adductors.
- The sinus is short and square.
The animal has razor like shell and all above characters, hence it is Ensis.