Monogenea

noun plural
Mono·​ge·​nea | \ ˌmän-ə-ˈjē-nē-ə How to pronounce Monogenea (audio) \

Medical Definition of Monogenea

: a class, subclass, or suborder of parasitic platyhelminthic worms that were formerly usually classified as trematodes but are currently considered to be more closely related to the tapeworms and that comprise flatworms ordinarily living as ectoparasites on a single usually fish host throughout the entire life cycle — compare digenea