- Azygiidae [familie]
- Brachylaimidae [familie]
- Brauninidae [familie]
- Bucephalidae [familie]
- Cyathocotylidae [familie]
- Cyclocoelidae [familie]
- Derogenidae [familie]
- Diplostomidae [familie]
- Gymnophallidae [familie]
- Hemiuridae [familie]
- Lecithasteridae [familie]
- Leucochloridiidae [familie]
- Sanguinicolidae [familie]
- Schistosomatidae [familie]
- Strigeidae [familie]
- Typhlocoelidae [familie]