Noun | 1. | Myxiniformes - hagfishes as distinguished from lampreys Hyperotreta, Myxinoidea, Myxinoidei, suborder Hyperotreta, suborder Myxiniformes, suborder Myxinoidei animal order - the order of animals Cyclostomata, order Cyclostomata - primitive jawless aquatic vertebrate: lampreys; hagfishes |