CLASSIFICATION OF CTENOPLANA

PHYLUM :- CTENOPHORA (Biradially symmetrical. Radiata without nematocysts. )

CLASS :- TENTACULATA  (With tentacles.)

ORDER :- PLATYCTENEA (With 2 tentacles and without comb rows. )

GENUS :- Ctenoplana

GEOGRAPHICAL DISTRIBUTION

It is found along the coasts of Indo-China and Japan.

HABIT AND HABITAT

Ctenoplana is marine solitary, planktonic ctenophore.

CTENOPLANA

GENERAL CHARACTERSTICS OF CTENOPLANA

  • It is an aberrent ctenorhore fIrst discovered by Korotneff (1886) and later worked by Willey (1896), Dawyboff (1929) and Komai (1934).
  • Body consists of flattened oval, central thick portion and two rounded, thin lobes in the sagittal plane.
  • It measures 5 to 8 mm in the tentacular plane and coloured dorsally, mostly olive-green, brown or reddish. It reproduces asexually. 
  • Between the lobes of the anterior notch, there is a long tentacle giving irregular side branches. Main tentacle arise from base covered by tentacular sheath. 
  • There are 8 short comb rows of several plates connected to statocyst by ciliated furrows.
  • Oral surface is characterised by everted pharynx, gastrovascular canal and peripheral network of gastrovascular canals. 
  • Anus present on left lobe.
  • It reproduces asexually.
CTENOPLANA

SPECIAL FEATURES

At the time of discovery of Ctenoplana and Coeloplana they were considered by some zoologists as connecting links between coelenterates and flatworms; but their structural details show that they are simply modifIed creeping ctenophores.

IDENTIFICATION

Besides above characters, main tentacle has several side branches and hence it is Ctenoplana.

CTENOPLANA
CTENOPLANA
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