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Animal Kingdom

Question
CBSEENBI11025138
Wired Faculty App

True coelom appeared first in the course of evolution in

  • Aschelminthes

  • Chordata

  • Echinodermata

  • Annelida

Solution

D.

Annelida

Phylum Annelida shows evidence for first true coelomates. Species belonging to annelida eg. Nereis, hirudinaria etc. Show presence of all three germ layers viz. Ectoderm, Endoderm and Mesoderm. The cavity (coelom) is lined by the cells of Mesoderm. Annelids are schizocoelomates. Mesoderm splits and forms the schizocoelom. In schizocoelomates the opening of the embryonic gut first develops into mouth and later forms the anus.

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