CLASSIFICATION OF CESTUM

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

CLASS :- TENTACULATA  (With tentacles.)

ORDER :- CESTIDA (Band-like form.)

GENUS :- Cestum

GEOGRAPHICAL DISTRIBUTION

It is found in the Mediterranean Sea, occasionally brought to the Gulf-Stream and New England coast.

HABIT AND HABITAT

Cestum is a marine solitary and bioluminescent ctenophore

CESTUM

GENERAL CHARACTERSTICS OF CESTUM

  • Commonly called as ‘Venus belt’ or girdle of venus among the comb-jellies.
  • Process of transverse compression is found to such an extent that the body is elongated in the sagittal plane to a flattened transparent, gelatinous band, measuring approximately 1.5 meters in length.
  • Transparent body shimmers with violet, blue or green colour.
  • Four sub-tentacular comb rows are elongated to run along the entire aboral edge of the band-like body. Tentacles are reduced to tufts of filaments. 
  • Small lateral tentacles line the oral edge.
  • Four interradial meridional canals arise directly from the stomach. 
  • Mouth is found in the mid-oral edge and statocyst on aboral edge. Sub-tentacular meridional canal and pharyngeal canals are present.
  • Animal swims by the graceful, muscular undulations of the body and by the beating of comb or swimming plates. Sub-sagittal canals accompany the corresponding comb rows along the entire aboral.
CESTUM

IDENTIFICATION

The specimen contains girdle-shaped body comb jaws and all above character and hence it is Cestum.

CESTUM
CESTUM
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