Superfamily Gymnophalloidea Odhner, 1905
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Fellodistomidae are common parasites of a wide range of marine and freshwater fishes and some marine invertebrates. They are characterized by a smooth tegument, a V- or Y-shaped excretory vesicle, post-gonadal uterus, restricted vitelline fields, uterine seminal receptacle and an anterior opening of Laurer’s canal (Bray, 2002). Brooks et al. (1985) in their phylogenetic analysis of Digenea have not included Fellodistomidae which they have considered ‘insertae sedis’ and polyphyletic. Subsequently, Hall et al. (1999) supported the polyphyletic nature of Fellodistomidae and based on molecular evidence, distributed the members of the family in three families: Fellodistomidae Nicoll, 1909, Faustulidae Poche, 1926 (Syn. Baccigerinae Yamaguti, 1954) and Tandanicolidae Johnson, 1927.