Class 11 Biology Animal Kingdom Phylum Echinodermata

Phylum Echinodermata

  • The animals of phylum echinodermata have an endoskeleton of calcareous ossicles and, hence, the name Echinodermata.
  • All are marine with organ-system level of organization, the adult echinoderms are radially symmetrical but larvae are bilaterally symmetrical, triploblastic and coelomate animals.
  • Digestive system is complete, excretory system is absent.
  • Water vascular system, the most distinctive feature, helps in locomotion, capture and transport of food and respiration.
  • Sexes are separate, reproduction is sexual, fertilisation is usually external and development is indirect with free-swimming larva.

Examples-Asterias (Star fish), Echinus (Sea urchin).


Fig. Star fish

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