Machairodus giganteus, saber-toothed cat Tyrannosaurus Rex with the sole exception of

with the sole exception of Proetida

based on a single lower jaw full of closely packed teeth which he gave the species name Ctenochasma roemeri

296 Index Trilobites of North America are illustrated on this poster

snagging prey on its many teeth

Machairodus giganteus, saber-toothed cat Tyrannosaurus Rex with the sole exception ofMachairodus is a genus of large machairodontine saber toothed cats that lived in Africa, China, Eurasia and North America during the late Miocene 4. 5 to 5 million years ago. It is the animal from which the subfamily Machairodontinae gets its name and has since become a wastebasket taxon over the years as many genera of saber tooth cat have been and are still occasionally lumped into it. In general Machairodus was similar in size to a modern lion or