Hesperocyoninae is a subfamily of extinctcanids. Taxonomic history Hesperocyoninae was named by Martin (1989). The members of this subfamily were reassigned to the family Canidae (with no subfamily) by Xiaoming Wang in 1999. Hesperocyoninae are basal canids that gave rise to the other canid groups, including the Borophaginae and Caninae according to Wang and Tedford. This disused subfamily were endemic to North America living from the Duchesnean stage of the Late Eocene through the early Barsto… (More on Hesperocyoninae)