Squalius

Squalius is a genus of freshwater ray-finned fish belonging to the family Leuciscidae, the daces, Eurasian minnows and reklated fishes. The fishies in this genus are found in Europe and Asia. Hybridization is not rare in the Leuciscidae, including this genus. S. alburnoides is known to be of ancient hybrid origin, with the paternal lineage deriving from a prehistoric species related to Anaecypris; the latter mated with ancestral S. pyrenaicus. Present-day S. alburnoides mates with sympatric congeners of other species.