Deep divergence among subgenera of Gyrodactylus inferred from rDNA ITS region

摘要: This paper adds new insight to a molecular phylogeny of Gyrodactylus, based on complete sequence the ITS rDNA region 4 subgenera and more detailed analysis. We propose hierarchical approach in elucidating this species-rich genus. A total 37 sequences (915–1239 bp) from 10 representative species out 6 subgenera, as defined by Malmberg (1970), are included Genetic differences observed at 5.8S locus provide objective criteria separate (sub)genera, while deep genetic spacers form sound basis for species-specific identification. demonstrate that each Gyrodactylus subgenus possesses unique gene. Thus, there is concordance between gene excretory system used (1970) diagnostic character status. At level, discrepancy morphological variation. Whereas variation, expressed shape size attachment apparatus, very low, ITS1 ITS2 regions, high. can be attributed either fast evolving or fact genus consists groups higher taxonomic level than previously recognized. Perspectives limitations using discussed.