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?
American lion 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 North America during the Pleistocene epoch (340,000 to 11,000 years ago), existing for about 0.33 million years. It has been shown by genetic analysis to be a sister lineage to the Eurasian cave lion ("Panthera leo spelaea" or "P. spelaea"). It was part of the abundant Pleistocene megafauna, a wide variety of very large mammals that lived at the time. The most abundant remains have come from the La Brea Tar Pits.
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".