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  • The adults are radially symmetrical but larvae exhibit bilateral symmetry inOption: 1 MolluscaOption: 2

The adults are radially symmetrical but larvae exhibit bilateral symmetry in

Option: 1

Mollusca


Option: 2

Hemichordata


Option: 3

Echinodermata


Option: 4

Cephalochordata


Answers (1)

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Phylum Echinodermata

  • The term ‘Echinodermata’ is obtained from the Greek words echinos meaning spiny and dermos meaning skin. 
  • This phylum includes sea stars, sea cucumbers, sea urchins, sand dollars, and brittle stars.
  • These are exclusively marine.
  • These are triploblastic with a true coelom.
  • They bear resemblance to chordates in showing radial cleavage in embryo and development of blastopore that forms anus.

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In echinoderms, the adults are radially symmetrical and larvae are bilaterally symmetrical.

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Divya Prakash Singh

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