Confirmation of the paraphyletic relationship between families Opisthorchiidae and Heterophyidae using small and large subunit ribosomal DNA sequences.

Opisthorchiidae and Heterophyidae are classified into different families based on morphological identification. However, recent molecular phylogenetic studies suggested the possible paraphyletic relationship between these two families. In this study, the paraphyletic relationship between these two families was confirmed further by maximum likelihood and Bayesian inference analyses using the combined sequences of SSU and LSU rDNA.