SABELLA OR PARASABELLA​

CLASSIFICATION OF SABELLA OR PARASABELLA​

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

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

ORDER :- TUBICOLA (Tubicolous, sedentary and proboscis non-protrusible, without jaws or teeth.)

GENUS :- Sabella or Parasabella

GEOGRAPHICAL DISTRIBUTION

  • It is distributed throughout the world but especially U.S.A. (North Carolina to Cope Cod).

HABIT AND HABITAT

  • Sabella is a marine, tubicolous polychaete present in low tide mark to approximately 100 fathoms deep. It is often incrusted on oyster shells, etc.

SABELLA OR PARASABELLA​

GENERAL CHARACTERSTICS OF SABELLA OR PARASABELLA​

  • Commonly called as ‘peacock worm’ 
  • Animal lives in upright tube, made up of sand grains glued together.
  • Body is divided into small head, a trunk and abdomen.
  • Head is constituted by the prostomium, which contains several gill filaments or feathery tentacles which are modified palps. Each tentacle has 2 rows of small pinnules having mucus-secreting glands.
  • Trunk region has 8 segments. First segment is called as peristomium which is collar-like having large ventral gland shield to secrete mucus. Peristomium has notopodium and setae, . but no neuropodium. The rest seven segments have normal parapodia, each consisting of a notopodium with normal setae and a neuropodium with small bent setae called crochets or uncini.
  • Abdomen is the largest part.
  • A dorsal faecal groove extends ventral side. from mouth to anus. It curves down in the last trunk segment to (8) Parasabella is another allied form. In tIns species gill filaments are long and the slender peristomium is raised and reflexed to form a collar around the gills which is notched dorsally.
SABELLA OR PARASABELLA​

IDENTIFICATION

  • The animal has feathery tentacle and all above characters, hence it is Sabella.

SABELLA OR PARASABELLA​
SABELLA OR PARASABELLA​
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