Laviniinae
Laviniinae is a subfamily of freshwater ray-finned fishes belonging to the family Leuciscidae, the family which includes the daces, chubs, Eurasian minnows and related fishes. Members of this subfamily are known as western chubs or the western clade of minnows. As the name suggests, most members of this clade are found in western North America aside from Chrosomus, which is found in eastern North America.
One of the largest North American cypriniforms and the largest member of Leuciscidae, the Colorado pikeminnow, belongs to this subfamily.
Fossil remains of a large minnow presumably related to Ptychocheilus have been recovered from the Late Eocene or Early Oligocene-aged deposits of the Cypress Hills Formation in Saskatchewan.