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Latin – strigatus (striped).
The members of this family are rather tiny 1–3 mm long digenetic trematodes, the body of which seems to be divided in two portions since a groove is surrounding the midbody region. The anterior portion contains the mouth sucker, the ventral sucker plus an additional adhesion organ (= tribocytic organ). The posterior portion contains inside the sexual organs and outside their exits. The adult worms (e.g., Apatemon (syn. Strigea) gracilis, Cotylurus cornutus, Parastrigea robusta, etc.) live in the intestine of ducks, goose, pigeon, and several water birds. Their eggs are operculated. The miracidia enter freshwater snails, while freshwater fish (Apatemon spp.), other snails or leeches (Cotylurus spp.), respectively, and larval/adult frogs (Parastrigea spp.) are used as second intermediate hosts. Thus this type of life cycle is called triheteroxenous.