Panthera youngi is known from Choukoutien, northeastern China and Japan, and lived about 350,000 years ago in the Pleistocene epoch, Harington, 1969 suggested that the American lion, the Eurasian cave lion and the large Chinese "Panthera youngi" are conspecific, The American lion ("Panthera leo atrox" or "P. atrox" ) – also known as the North American lion, Naegele’s giant jaguar or American cave lion – is an extinct lion of the family Felidae, endemic to which location during the Pleistocene epoch?
Panthera youngi Panthera youngi is known from Choukoutien, northeastern China and Japan, and lived about 350,000 years ago in the Pleistocene epoch. Fossils found in Japan were originally regarded to belong to those of tigers, but being discovered later that at least some belong to lions. Harington, 1969 suggested that the American lion, the Eurasian cave lion and the large Chinese "Panthera youngi" are conspecific.
Canis rufus rufus Canis rufus var. "rufus" (formerly Canis rufus rufus) or the Texas red wolf, distinct from the extinct Texas (gray) wolf († "Canis lupus monstrabilis") is a type of red wolf that lived in Texas. As the Texas red wolf is no longer considered a red wolf "Canis rufus" subspecies, though it was formerly considered to be "Canis rufus rufus" (which according to taxonomic conventions tends to indicate it as a probably type subspecies for the "Canis rufus" species), and it has been given no forma taxon below the species level, the Texas red wolf would now be considered a type, kind, or variety of the species, perhaps "Canis rufus" var. "rufus".