Write down four main characters of Annelida. - Vidyadip

Question

Write down four main characters of Annelida.

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Answer

Body triploblastic, bilaterally symmetrical, soft, elongated, vermiform and cylindrical or dorsoventrally flattened.
Exoskeleton absent; body is covered by a thin cuticle.
Alimentary canal is tube-like, complete and extends straight from mouth to anus.
Reproduction is by sexual means. Sexes may be united (hermaphroditic) or separate.

Example: Nereis (sand worm) and Hirudinaria (leech).

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