Abstract:A systematic analysis of the genera in the Diplostomidae and Strigeidae was made using the Proterodiplostomidae as the outgroup. The Proterodiplostomidae was the family with the greatest preponderance of primitive characters and its monophyly was supported by the unique paraprostate gland. However, no character state supported the monophyly of the Diplostomidae sensu Dubois, 1970. That paraphyletic taxon was composed of 3 monophyletic groups: the pseudosuckerless Neodiplostomidae n. fam. had the most primitive…
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