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Nereidiformia

plural noun
Ne·​re·​idi·​for·​mia | \ ˌnirēˌidəˈfȯrmēə, nə̇ˌrēəd-\

Definition of Nereidiformia

in some classifications
: a division of polychaete worms nearly equivalent to Errantia

History and Etymology for Nereidiformia

New Latin, from Nereid-, Nereis, genus of polychaete worms + -iformia (from Latin, neuter plural of -iformis -iform)

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