CLASSIFICATION OF DORIS (SEA LEMON)​

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 :- OPISTHOBRANCHIA (Gastropods with detorsion; gills posterior of heart; shell reduced or lacking)

SUB-ORDER :- NUDIBRANCHIA (Adults naked without mantle and shell.)

FAMILY :- DORIDIDAE

GENUS :- Doris

GEOGRAPHICAL DISTRIBUTION

  • Cosmopolitan but specially found in the waters of New England.

HABIT AND HABITAT

  • Doris is a sluggish marine and curious gastropod found under stones at low tide mark and between weeds. It feeds on incrusting organisms like sponges

DORIS (SEA LEMON)​

GENERAL CHARACTERSTICS OF DORIS (SEA LEMON)​

  • Commonly known as sea lemon.
  • Body consists of more or less ovoid mass with a convex warm dorsal side.
  • Colour is purplish brown.
  • Head bears a pair of short retractile tentacles or rhinophores beset with calcareous spicules. 
  • Mantle is usually pigmented and contains calcareous spicules or dorsal tubercles. 
  • The anus lies mid-posteriorly and is surrounded by a circlet of feathered retractile secondary branchiae. 
  • Ventral surface has mouth, head, tentacle and mantles. Anus is surrounded by branchia or gills.
  • Foot has a large creeping sole. Dorsal surface has protruding penis. 
  • Digestive gland unbranched compact mass and nervous system of euthyneurous type.
  • Sexes are united and the gonopore is asymmetrically placed on the right side of the body.
DORIS (SEA LEMON)​

IDENTIFICATION

  • The animal contains secondary retractile tentacles and all above features hence it is Doris.

DORIS (SEA LEMON)​
DORIS (SEA LEMON)​
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