The Cave Lion (Panthera spelaea and Panthera fossilis)

[GrizzlyClaws]

Me and @tigerluver we both tried to specialize on the limited materials available to us.

Canine teeth: Based on what we discuss so far, a 500 mm lion skull is pretty much producing the largest upper canine teeth for any pantherine cat, comparable to the few obscure massive tiger canine teeth I just posted. When both lion and tiger have the same canine teeth, tiger turned out to be the smaller cat. So the owners of these huge tiger canine teeth are arguably smaller than this super giant lion.

Skull and limb: @tigerluver made his own research and found out that these available measurements has reached the theoretical max for the big cats. They were not only longer, but also much thicker than the late Pleistocene lions. I guess the middle Pleistocene was warmer, so the middle Pleistocene lions didn't need to spend too much energy to against the harsh winter that frequently occurred in the late Pleistocene.

Although my conclusion sounds amateur-ish, but everything seems to match perfectly, all puzzles fit in its place perfectly. Reply