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The phylogenetic position of three taxa from two trematode genera, belonging to the subfamily Acanthostominae (Opisthorchioidea: Cryptogonimidae), were analysed using partial 28S ribosomal DNA (Domains 1–2) and internal transcribed spacers (ITS1–5.8S–ITS2). Bayesian inference and Maximum likelihood analyses of combined 28S rDNA and ITS1 + 5.8S + ITS2 sequences indicated the monophyly of the genus  Acanthostomum  ( A.  cf.  americanum  and  A. burminis ) and paraphyly of the Acanthostominae .  These phylogenetic relationships were consistent in analyses of 28S alone and concatenated 28S + ITS1 + 5.8S + ITS2 sequences analyses. Based on molecular phylogenetic analyses, the subfamily Acanthostominae is therefore a paraphyletic taxon, in contrast with previous classifications based on morphological data. Phylogenetic patterns of host specificity inferred from adult stages of other cryptogonimid taxa are also well supported. However, analyses using additional genera and species are necessary to support the phylogenetic inferences from this study. Our molecular phylogenetic reconstruction linked two larval stages of  A.  cf.  americanum  cercariae and metacercariae. Here, we present the evolutionary and ecological implications of parasitic infections in freshwater and brackish environments.

peerj

A molecular phylogenetic appraisal of the acanthostomines<i>Acanthostomum</i>and<i>Timoniella</i>and their position within Cryptogonimidae (Trematoda: Opisthorchioidea)

A molecular phylogenetic appraisal of the acanthostominesAcanthostomumandTimoniellaand their position within Cryptogonimidae (Trematoda: Opisthorchioidea)