Write four features of phylum Echinodermata.
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phylum :Echinodermata
(Echinus-spines, derma-skin)
1:these are exclusively marine, solitary, sedentary or free -living and gregarious,
benthic
2:these are radialy symmetrical animals with pentamenous symmetry.
3:body may be spherical, elongated or
star shaped.
4:endoskelton is made up of calcareous
osciculs.
5:spines are present on the body, hence the name echinodermata.
6:circulatory and respiratory system is absent.
e.g.Asterias(sea stars), cucumaria(sea cucumber), Echinus(sea urchin), Antedon(sea lily), Ophiothrix (Brittle star).
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