Het`e*ro*ne*re"is (?), n. [NL. See Hetero-, and Nereis.] Zool.

A free-swimming, dimorphic, sexual form of certain species of Nereis.

⇒ 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.


© Webster 1913.

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