noun Heteronereis n. (Zool.) A free-swimming, dimorphic, sexual form of certain species of Nereis. Note: In this state the head and its appendages are changed in form, the eyes become very large; more or less of the parapodia are highly modified by the development of finlike lobes, and branchial lamellae, and their setae become longer and bladelike.
Collaborative International Dictionary of English 0.48
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