Nereis General Characteristics | Free Biology Notes

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General Characteristics of Nereis

1. Commonly called clam worm or sand worm
2. The animal body is long, narrow and cylindrical
3. Every segment has leaf like appendages called parapodia
4. First segment have sensory organs like pair of eye, tentacles and palps
5. Anal segment have anal cirri
6. Nereis is unisexual and its reproductive phase is called Heteronereis
7. Fertilization occurs in sea water
8. During development, a trochophore larva is present