write a short note on echinodrems
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Echinodermata is originated from 2 greek words , echinos meaning hedgehog and derma means skin son it means organism having spines in their body.
These are free living marine animals.
They are triploblastic and have a coelomic cavity.
They have water driven tube system for movement.
They have hard calcium carbonate structure that they use as a skeleton.
Examples are starfish and sea urchins.
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Characteristic Features of Phylum Echinodermata
These are exclusively marine animals.
The larval forms show bilateral symmetry and adult forms show radial symmetry.
They are triploblastic.
It exhibits organ system grade of organisation.
They have a true coelom.
The body is uniquely shaped.
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