Sabertooth Cat, Megantereon nihowanensisl There are two kinds of “true cats.” Cat experts call one type feline or “modern” partly because they are the ones that did not go extinct. If you have a pet cat, it’s a modern/feine cat. This also includes the lions, tigers, leopards, etc. The other kind are called “sabercats” because this group includes the saber tooth. It is generally believed but not at all certain that these two groups of cats are different phylogenetic lineages (but that is an oversimplification).
It has been suggested for some time that the bite force mechanics for at least the most derived, latest (but, alas, still extinct) sabercats was less than modern cats. Specifically, this means that when the jaw and the maxilla are brought together by the major muscles that operate this system, the force of the bite is less in the sabercats. Another thing that has been suggested for some time is that among living (modern) cats, there is a fundamental difference in bite mechanics between the smaller cats (who have round heads) and the larger cats such as lions, who have squarer heads with more snouty faces.
Lion skull However, these assertions have not been as well tested because of a) a lack of live examples of sabercats to test the hypotheses on and b) lack of application of three dimensional morophometric modeling, which is the new thing in functional analysis of animal anatomical systems.
A recent paper, “Evolution of Skull and Mandible Shape in Cats (Carnivora: Felidae),” by Per Christiansen published in PLoS One gives us a new perspective on this. He has applied the morphometrics and come to some interesting conclusions regarding the evolution of bite force mechanics in cats.
This is pretty straight forward, so I’m going to bullet point it for you:
Continue reading The Evolution of Cats: Sabertooth vs. Regular →
