the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Annelida > [noun] > member of class Myzostomida (3)
An annelid worm of the genus Myzostoma or the class Myzostomida; (also) the genus itself. Cf. myzostomid, n. adj.
Any of various small annelid worms belonging to the class Myzostomida, which have disc-like bodies with suckers and are commensals and ectoparasites…