Molecular phylogeny supports invalidation of and (Digenea: Diplostomidae) and reveals a from mammals.

, and are among genera of diplostomid digeneans known to parasitize mammalian definitive hosts. Despite numerous recent molecular phylogenetic studies of diplostomids, limited DNA sequence data is available from diplostomids parasitic in mammals. Herein, we provide the first 28S rDNA and mtDNA sequences from morphologically identified, adult specimens of and . Newly generated 28S sequences were used to infer the phylogenetic interrelationships of these two genera among other major lineages of diplostomoideans. The phylogeny based on 28S and a review of morphology clearly suggests that should be considered a junior synonym of , while should be considered a junior synonym of . (type species), and were transferred into as , and ; (type species) and were transferred into as and In addition, (formerly included in ) was restored and transferred into based on a morphological study of well-fixed, adult specimens and the comparison of DNA sequences among spp. The diplostomid genus was restored based on review of morphology.