Characteristic features of phylum cnidaria, Biology

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Characteristic features of Phylum Cnidaria

All are aquatic animals.
Radial or biradial symmetry around an oro-aboral axis, but no head.
Diploblastic, with an epidermis and a gastrodermis, and a less cellular or non- cellular, gelatinous mesoglea in between.
A gastrovascular cavity with a single opening, the mouth; tentacles encircling the oral region.
No coelom, respiratory system or separate excretory.
Nave net, for diffuse conduction only, present. Some sensory organs also occur.
No distinct muscle tissue, but epithelia - muscular system is present.
Two forms of individuals - benthic polyps and pelagic medusae - occur. Polyps usually reproduce asexually, budding sexual medusae. Sexual reproduction in all medusae and some polyps, involving gametes. Cleavage holoblastic and indeterminate.

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