heteronereis
異沙蠶
Het·e·ro·ne·re·is 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 lamellæ, and their setæ become longer and bladelike.
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