Describe the characteristics of Phylum Echinodermata and discuss how the body form varies in the 5...

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Biology

Describe the characteristics of Phylum Echinodermata and discusshow the body form varies in the 5 classes
zoology question

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Habitat Echinoderms are marine They grow at sea bottom borne are pelagic free swimming in open water and a few are sessile attached to the substratum Body Form It varies considerably The body is starshaped spherical or cylindrical It is unsegmented The body do not have head Spines and Pedicellariae Many echinoderms has spines and pincerlike pedicellariae on their skin The spines are protective in function The pedicellariae keep the body surface clear of debris and minute organisms Symmetry The symmetry is bilateral in larvae but pentamerous radial in adults i e body parts are arranged in fives or multiples of five Body Wall The upper layer of skin is single layered and ciliated Endoskeleton is of calcareous plates in the dermis which are mesodermal in origin Body Cavity it has a true enterocoelic coelom Ambulacral System Water Vascular System it is the characteristic feature of echinoderms that it has See Answer

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