ANIMAL KINGDOM Part-9, NCERT Class-11

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Phylum-Ctenophora

• Commonly known as Sea-walnut or Comb-Jellies.
• Ctenophores are exclusively marine
• Radially Symmetrical, Diploblastic.
• Ctenophores exhibit Tissue level of body organisation.
• Their body possess eight  external rows of ciliated COMB PLATE (Hepls in Locomotion)
• Intracellular and Extracellular digestion seen.
• Ctenophora phylum's well marked property is BIOLUMINESCENCE (Living organism's light emitting feature)
• Hermaphrodite 
• Reproduction in only sexual mode
• External fertilization with Indirect development.

Example:
• Pleurobrachia

• Ctenoplana


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