The reproductive success of uniparental males depends much on their nutritional stage (i.e. body condition). Therefore, secondary sexual traits should convey information not only fecundity but also stage. To test this hypothesis, we evaluate relationships between head crest height (HCH), as a trait, relative testes mass (an indicator sperm production), condition status) and Amur sleeper Perccot...

This study is devoted to the investigation of Azygia (Digenea: Azygiidae) species diversity using classical morphological, recent molecular tools (28S rRNA and cox1 mtDNA for genetic-based inference) robust statistical techniques (Principal component analysis, PCA). The analysis revealed that genus included four valid species: A. lucii, longa, hwangtsiyui, sibirica n. sp. distribution type luci...