CLASSIFICATION OF POLYNOE

PHYLUM :- ANNELIDA (Metamerically segmented, coelomate and laterally symmetrical. )

CLASS :- POLYCHAETA (Many setae, clitellum absent. )

ORDER :- ERRANTIA (Free-swimming or burrowing, pharynx protrusible, provided with jaws and teeth. )

GENUS :-  Polynoe

GEOGRAPHICAL DISTRIBUTION

  •  It is found in Europe and U.S.A. (South Carolina to Massachusetts).

HABIT AND HABITAT

  • Polyone is a bioluminescent, carnivore, marine, errant polychaete, hidden under stones near tide lines

POLYNOE

GENERAL CHARACTERSTICS OF POLYNOE

  • It is an allied form of Aphrodite consisting of a short body with parallel sides. The body shows considerable degree of dorso-ventral compression.
  • Anterior end is distinguished into head, which bears three tentacles. 
  • Pharynx is protrusible containing teeth at protruded end. They eat one another. 
  • Some posterior parapodia bear setae. 
  • Certain parapodia instead of cirri bear broad, flattened and scale-like elytra, which constitute protective covering to the back. 
  • Elytra do not contain setae and have rich nerve supply.
  • Elytra are bioluminescent and the illuminating elytra are easily cast off when disturbed or elytra are shed off to deceive the enemy. 
  • Utility of the casting off of elytra is not known but throwing of it frequently may be to deceive the enemies. This is protective device. 
  • Fertilized ova and embryos adhere to masses under each elytra.
POLYNOE

IDENTIFICATION

  • The animal contains elytra without setae and all above features and hence it is Polynoe.

POLYNOE
POLYNOE
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