(Didymozoidae) (Didymozoidae) is a biological family of the class Trematoda and order Azygiida.
Adenodidymocystis
Allometanematobothrioides
Annulocystis
Atalostrophion
Coeliodidymocystis
Coeliotrema
Colocyntotrema
Dermatodidymocystis
Didymocylindrus
Didymocystis
Gonapodasmius
Nematobothrioides
Nematobothrium
Neodiplotrema
Neonematobothrioides
Neounitubulotestis
Oesophagocystis
Opepherotrema
Opisthorchinematobothrium
Orbitonematobothrium
Ovarionematobothrium
Phacelotrema
Platocystis
Reniforma
Unitubulotestis
Univitellannulocystis
Univitellodidymocystis
Accacoeliidae
Albulatrematidae
Aphanhysteridae
Areobiotrematidae
Arnolidae
Azygiidae
Bathycotylidae
Bivesiculidae
Bothrigastridae
Cylindrorchiidae
Dictysarcidae
Didymozoidae
Halipegidae
Hemiuridae
Hirudinellidae
Lampritrematidae
Lobatovitelliovariidae
Mabiaramidae
Oesophagicolidae
Pelorohelminthidae
Prosogonotrematidae
Ptychogonimidae
Sclerodistomidae
Syncoeliidae
Tetrasteridae
Transversotrematidae
Typhlocoelidae