Plumularia
/ˌpluːmjʊˈlɛːrɪə/Zoology
noun
A genus of hydroids of the suborder Leptomedusae, colonies of which have alternating branches from the main stem, each of which bears polyps on one side only; (also plumularia) an animal of this genus.
Origin
Mid 19th century; earliest use found in The Lancet. From scientific Latin Plumularia, genus name from classical Latin plūmula little feather + -ārius.