Question

comments on heteronereis​

Answer 1

Answer:

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Answer 2

Answer:

Distribution:- free living worm found on surface of sea.

Habit and Habitat:- found in marine, swimming type habitat.

Identifying characters:-

Labelled diagram of HETERONEREIS.jpg

It is the sexual phase of Nereis.

Body:- differentiated into two distinct regions: an anterior atoke or non sexual region and a posterior epitoke or sexual region containing ova and sperms

Metamerism:- body consists of about 200 segments or metameres.

Head:- initial segments fused to form head consisting of eyes and peristomium.

Prostomium contains prostomial tentacles, ocelli and palps.

Parapodiacontain additional foliaceous lobes and setae become oar like.

Reduction of muscles and alimentary canal is observed due to development of gonads.

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