Superfamily Hemiuroidea Looss, 1899
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The superfamily Hemiuroidea comprises several families. Gibson & Bray (1979) in their classification of the Hemiuroidea based on the functional morphology of the adults recognized 14 families. The first molecular phylogenetic study of the Hemiuroidea, based on V4 variable domain of the 18SrRNA gene for 33 species of Hemiuroidea, supported the monophyly of Hemiuroidea and revealed two main groups, one group containing all members of Hemiuridae and Lecithasteridae and the other one comprising the members of Derogenidae, Didymozoidae, Hirudinellidae, Sclerodistomidae, Syncoelidae, and Accacoelidae (Blair et al., 1998). This classification of Hemiuroidea adapted in ‘Keys to the Trematoda’ Volumes 1–3 is followed here (Gibson, Bray, Jones 2002–2008).