CLASSIFICATION OF LIMPET OR PATELLA

PHYLUM :- MOLLUSCA (Unsegmented bilaterally symmetrical and provided with visceral mass, foot and mantle. )

CLASS :- GASTROPODA (Visceral hump twisted.)

SUB-CLASS :- PROSOBRANCHIATA (Gills in front of heart.)

ORDER :- ASPIDOHRANCHIATA (Gills bipectinate.)

SUB-ORDER :- DOCOGLOSSA (Ctenidium replaced by secondary gills.)

GENUS :- Patella

GEOGRAPHICAL DISTRIBUTION

  • It is found along Pacific coast, Atlantic coast, Europe and U.S.A. (California).

HABIT AND HABITAT

  • Patella is found on rocky beaches between tidemarks. It feeds on smaller sea-weeds and other marine vegetation.

LIMPET OR PATELLA

GENERAL CHARACTERSTICS OF LIMPET OR PATELLA

  • Commonly called as true limpet. 
  • Small, oval and sluggish creature. 
  • Dorsal side of the body is enclosed by a roundish shell, which is raised into a conical elevation by which it is easily recognized. 
  • Shell forms the miniature volcanic cone and dorsally it contains lines of growth. Operculum absent. 
  • Underside of the limpet shows a large foot with a broad creeping sole which acts as attachment organ to rocks.
  • Head contains 2 stout, sensory tentacles. There are 2 ospbradia, 2 nephridia and a simple heart (1 auricle).
  • True mantle cavity is restricted anteriorly and true ctnidia are replaced by pseudotenidia or secondary gills.
  • Radula docoglossate with 3 marginals and 3 laterals but no central teeth. There is no siphon. 
  • A secondary pallial cavity extends all round between the foot and mantle. 
  • Nervous system shows little concentration towards the head region.
LIMPET OR PATELLA

ECONOMIC IMPORTANCE

  • Patella has food value as it is generally eaten in France, Italy and Ireland.

IDENTIFICATION

  • Contains radiating ribs and all above features, hence it is Patella.

LIMPET OR PATELLA
LIMPET OR PATELLA
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