Didymozoidae

Didymozoidae
Scientific classification
Kingdom: Animalia
Phylum: Platyhelminthes
Class: Trematoda
Order: Plagiorchiida
Suborder: Hemiurata
Superfamily: Hemiuroidea
Family: Didymozoidae
Monticelli, 1888

Didymozoidae is a family of parasitic flatworms (class Trematoda) within the order Plagiorchiida. The group comprises endoparasitic flukes that primarily infect the tissues of marine teleost fishes.

Adult didymozoids are typically found encysted within the tissues of pelagic fishes, especially tunas and mackerels. The paired worms are enclosed within a shared cyst, which provides protection and facilitates reproduction. The family includes numerous genera such as Didymozoon, Nematobothrium, and Allometanematobothrioides.