Question

write the characters of phylum echinodermata​

Answer 1

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Answer 2

Answer :

Echinodermata -

• Organ system of body organisation.
• Adults exhibit radial symmetry where is Larvae exhibit bilateral symmetry.
• They are tripoblastic.
• They are ceolomate.
• They are exclusively found in Marine habitat.
• The digestive system is complete with a ventral mouth and dorsal anus.
• The respiratory system is made up of dermal branchie which includes skin gills and populae along with tube feets.
• The circulatory system is open.
• They are dioceious.
• They undergo external fertilization and the development is indirect.
• The Larva is ciliated free swimming.
• They have a endoskeleton made up of calcerous ossicles i.e. they are spiny bodied.
• They lack head.
• The excretory system is absent.
• There is a presence of water vascular system.
• In this system, sea water enters through a porous plate called madreporite.
• And then it reaches the radiating canals and tube feet called podia.
• This helps in locomotion, respiration, capture and transport of food and excretion.
• Examples : Asterias, Echinus, Antedon, etc.