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Machairodus giganteus, saber-toothed cat Tyrannosaurus RexMachairodus 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
296 Index Trilobites of North America are illustrated on this poster
form the cliffs
Between 1929 and 1937
snagging prey on its many teeth
000 14C years ago
Location: Aurora
with the sole exception of Proetida
Edmontosaurus is thought to have lived in groups
and Priscacara
Others are less easy to interpret and may belong to extinct phyla
When first discovered in the Red Beds of Herminia Tsao of the Early Maastrichtian Newest Formation by a Polish-Mongolian expedition in 1971
based on a single lower jaw full of closely packed teeth which he gave the species name Ctenochasma roemeri
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