CLASSIFICATION OF MYTILUS (SEA MUSSEL)​

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 :- MYTILIDA (Gill filaments incompletely fused, foot small and byssal gland present.)

FAMILY :- MYTILIDAE

GENUS :- Mytilus (The sea mussel)

GEOGRAPHICAL DISTRIBUTION

  • It has cosmopolitan distribution specially found in India, Europe, U.S.A. (California, San Francisco).

HABIT AND HABITAT

  • Mytilus is found at a depth of 2 or 3 fathoms in low tide, attached to rocks or wooden structures by its byssus threads. It is a sedentary bivalve mollusc. It is a filter feeder, filtering planktons from incurrent waters.

MYTILUS (SEA MUSSEL)​

GENERAL CHARACTERSTICS OF MYTILUS (SEA MUSSEL)​

  • Commonly called as sea mussel. 
  • Shell is elongated equivalved with umbo and marked by lines of growth.
  • Hinge toothless but may bear crenulations.
  • Postero-ventrally papillated edges of mantle and postero-dorsally lamelliform gills are seen. Foot cylindrical with byssus. 
  • Postero-ventrally papillated edges of mantle are seen and posterc-dorsally is exhalent siphon. 
  • Shell is marked with lines of growth.
  • Byssal filaments found in a byssal cavity are formed by byssal gland or byssogenous apparatus. 
  • After removing the shell internal structures such as lamelliform gills, foot, kidney, heart and alimentary canal enclosed by mantle lobes arc visible. 
  • Gills are lamelliform, i.e., the filaments are plate-like and united by ciliary junctions. 
  • Anterior adductor muscle is smaller and posterior adductor is larger, i.e., it is heteromyrian form. Posterior muscle is large and anterior small (anisomyrian).
  • Sexes are separate. Gonads extend into the mantle.
MYTILUS (SEA MUSSEL)​

ECONOMIC IMPORTANCE

  • Used for food in Europe. In India also they are relished as food by poor people living at seacoasts.

IDENTIFICATION

  • The animal contains umbo, byssus threads and all above features and hence it is Mytilus

MYTILUS (SEA MUSSEL)​
MYTILUS (SEA MUSSEL)​
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