Eosalmo

Eosalmo is an extinct genus of ancient freshwater salmonid with a single described species Eosalmo driftwoodensis. The genus lived during the Eocene epoch and has been recovered from late Ypresian fossils in the Eocene Okanagan Highlands of the northwestern United States and western Canada. Additional fossils briefly mentioned as Eosalmo were reported from Russia, but they have not received close taxonomic treatment since. E. driftwoodensis is used as a phylogenetic calibration point for studies of the relationships in Salmonidae and Salmoniformes. Based on preservation of juvenile to adult specimens at some of the sites, the species lived its full lifecycle in freshwater, with no travel from the highlands to the sea as in modern salmon.