Question

How might l identify an echinoderm?

Answer 1

Echinoderms are identified by their typical pentaradial symmetry. These are invertebrate marine organisms. All are bottom dwelling.

Explanation:

Body of an adult echinoderm has five ambulacral grooves (on oral side), associated with tube feet .

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Answer 2

These animals have an endoskeleton of calcareous ossicle and, hence, the name Echinodermata (Spiny bodied).

• All are marine with organ-system level of organisation.

• The adult echinoderms are radially symmetrical but larvae

• bilaterally symmetrical.
• They are triploblastic

• coelomate animals. Digestive system is complete with mouth

       on the lower (ventral) side and anus on the upper (dorsal)

       side.

• The most distinctive feature of echinoderms is the

       presence of water vascular system which helps in

       locomotion, capture and transport of food and respiration.

• An excretory system is absent.
• Sexes are separate.
• Reproduction is sexual. Fertilisation is usually external.
• Development is indirect with free-swimming larva.
• Examples: Asterias (Star fish), Echinus (Sea urchin), Antedon

(Sea lily), Cucumaria (Sea cucumber) and Ophiura (Brittle star)

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