eLife Assessment
In this valuable study, the authors attempt to reconstruct the evolutionary history of a large and widespread group of freshwater fishes (Nemacheilidae) across Eurasia since the early Eocene, based on molecular phylogenetic analysis with very comprehensive samplings including 471 specimens belonging to 250 living species. The authors infer that range expansions of the family were facilitated by tectonic connections, favourable climatic conditions, and orogenic processes, adding to our understanding of the effects of climatic change on biodiversity during the Cenozoic. The molecular evidence is overall solid, but the calibration points from the fossil records used in the analysis have not been clearly demonstrated or cited; the different dates for the calibration points might impact the discussion on the evolutionary history relating to past climatic changes.