Question

Exclusive marine, spiny bodies, usally external fertilization, indirect development with free swimming larva are the features related to
A) Antedon, cucumaria, logligo,
aplysia, dentalium
B) pinctada, Balanoglossus, Asterias,
Ophiura
C) Sea urchin, sea cucumber, sea fan,
sea pen, sea star
D) sea lilly, sea urachin, sea cucumber,
Brittle star​

Answer 1

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Answer 2

Echinodermata

Explanation:

• Features of echinoderms are as follows.
• Exclusively marine.
• The larval forms show bilateral symmetry and adult show radisl symmetry.
• They are triploblastic, organ system level of organisation.
• Spiny bodied as body surface is covered with calcareous spicules.
• Tube feet help in locomotion.
• Respiration through tubefeet and gills.
• Examples include Asterias(starfish), Echinus(sea urchin), Antedon(sea lily) Cucumaria (sea cucumber), ophiura (brittle star) etc.