Search the Community
Showing results for tags 'richardoestesia'.
Found 3 results
Fast. Intelligent. Deadly. The "Raptor" is perhaps one of the most famous dinosaur today thanks to Jurassic Park. To many people's surprise however, raptors are heavily feathered and nimbler than movies would have you believe. The Jurassic Park Velociraptor was merely the size of coyote in real life! In fact, their proper family name is 'Dromaeosaurid'. The largest species was Utahraptor, and it grew to the size of a grizzly bear! Dromaeosaurid fossils have been found all over the world. They first appeared during the Cretaceous, though isolated teeth have been found in the mid-Jurassic. Allow me to present my humble collection of Dromaeosaurid teeth. First up, from Cloverly Formation, one of my pride and joy from @hxmendoza A dromaeosaurid from Aguja Formation. I am seeing more Aguja fossils showing up, but dromaeosaurid teeth are still rare. Now, for the dromaeosaurids from the famous Hell Creek Formation. Some of them probably lived alongside T. rex. A big shout-out for @Troodon for getting me started on dromaeosaurids with this very first Acheroraptor!
I have recently acquired a nice Richardoestesia tooth from Hell Creek. I suppose it's R. isosceles. I decided to read more about this species, and felt really confused. Why is it even considered a dromaeosaur?? As far as I know, dromaeosaur teeth are not only usually smaller and strongly distally recurved, but also have no or very fine serrations on the mesial side and coarse serrations on the distal side. Richardoestesia teeth I've seen lack all of these characteristics: they have identical very fine serrations, straight and relatively large crowns. Actually, such teeth remind me a of land crocodylians, such as Sebecus from the Cenozoic, however Richardoestesia teeth are somewhat more labio-lingually compressed.
Is this a tooth of Richardoestesia isosceles? Scale marks on left side of tooth are in mm and on the right side are in 0.5 mm increments. Serration count ranges from about 6 to 8 per mm. What remains of the tooth is approximately 11 mm in length. Hell Creek Formation (Late Cretaceous: Maastrichtian), South Dakota.