Department of Zoology at ANDC/Zoology Museum/Museum specimens/Ctenophora

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Phylum Ctenophora

Date & Time : 5, December 2023 07:15

General Characteristics of Ctenophora

Ctenophorans are marine animals.

Classification of Ctenophora

A Few Examples

1. Pleurobrachia

Commmon name-comb-jelly.

Habitat-found all over the world, marine and pelagic form.


  • Body-transparent, ovoidal, laterally compressed.
  • Body shape- pear shaped.
  • Length- about 2 cm.
  • Mouth- located at the oral pole.
  • Sense organ- located at aboral pole.
  • Locomotory organ- longitudinal comb plates.
  • Tentacle- two in number, very  long, solid and highly extensile and retractile.

2. Cestum

Common name- Venus's girdle.

Habitat- marine and solitary, like to live in warmer seas.


  • Body- greatly elongated horizontally and compressed laterally.
  • Body shape- ribbon like.
  • Body color- green, blue and voilet.
  • Swimming plates- eigth in number, four are very  small while other four are continued along the aboral edge.

3. Ctenoplana

Habitat- marine, solitary and planktonic.


  • Body-small and nearly circular, flattened dorso-ventrally.
  • Length- about 6 mm in diameter.
  • Body color- olive green

4. Ceoloplana

Habit and habitat- marine and solitary, found in the Red Sea and in Japan.


  • Body- oval, elongated in the tentacular plane.
  • Mouth- ventrally sotuated.
  • Swimming plate- absent.
  • Statocyst- present dorsally.
  • Tentacles- paired and retractile.
  • Fertilized eggs attach to the oral surface of mother.