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Tracing ancient evolutionary divergence in parasites
SUMMARY For parasitic platyhelminths that generally lack a fossil record, there is little information on the pathways of morphological change during evolution. Polystomatid monogeneans are notable for their evolutionary diversification, having originated from ancestors on fish and radiated in parallel with tetrapod vertebrates over more than 425 million years (My). This study focuses on the genus Polystomoides that occurs almost worldwide on freshwater chelonian reptiles. Morphometric data showdoi:10.1017/s0031182016001347 pmid:27576454 fatcat:txu4h2offng4fphepfdg4zjff4