Nereidiformia
plural noun
Ne·re·idi·for·mia
ˌnirēˌidəˈfȯrmēə,
nə̇ˌrēəd-
in some classifications
: a division of polychaete worms nearly equivalent to Errantia
Word History
Etymology
New Latin, from Nereid-, Nereis, genus of polychaete worms + -iformia (from Latin, neuter plural of -iformis -iform)