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Errantia

plural noun
Er·​ran·​tia | \eˈranch(ē)ə, -ntēə\

Definition of Errantia 

in some classifications

: a division of Polychaeta comprising free-swimming worms (such as those of the genera Aphrodite, Nereis, and Polynoe) usually with well-developed parapodia and sense organs and without special respiratory structures

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History and Etymology for Errantia

New Latin, from Latin, neuter plural of errant-, errans, present participle of errare to wander, err

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