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Acheroraptor: A new “raptor” dinosaur from the Hell Creek Formation

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Acheroraptor

A few days ago, scientists announced the discovery of a new species of dinosaur – Acheroraptor, “thief from Acheron”. I’m sorry to disappoint all of you Aliens fans, but no, this dinosaur is NOT named after Planet LV-426, code-named “Acheron”. The name actually refers to the Acheron River in ancient Greek mythology, “the River of Pain”. This name is an obvious pun on the name of the place where the fossils were discovered – the Hell Creek Formation in Montana.

Not much is known about this animal, but here are a few statistics. As you can probabaly guess, Acheroraptor is one of the “raptor” dinosaurs made famous by Jurassic Park. Raptors are divided up into two main groups: the dromaeosaurids and the troodontids. Acheroraptor was a dromaeosaurid, and this brings up another issue…

In an earlier post, I talked about Dromaeosaurus, a dromaeosaurid raptor from western North America (http://dinosaursandbarbarians.wordpress.com/2013/11/12/dromaeosaurus/). I had stated that its teeth had been found in several different locations, including the Hell Creek Formation. Well, that was perfectly true when I wrote it, but not anymore. For the past few decades, paleontologists had been finding raptor teeth in the HCF, and since they looked similar to the teeth of Dromaeosaurus, these teeth were ascribed to that genus. However, Dromaeosaurus was only known from Canada, and its fossils were found in rocks that were dated much older than the Hell Creek Formation – ten million years older, to be exact. But few other raptor dinosaurs were known from late Cretaceous western North America, and the teeth did look more or less similar to the teeth of Dromaeosaurus, and so that was the identification that was given. Now, paleontologists have discovered that all this time they were perpetuating a case of mistaken identity. It actually happens quite often in this particular science. It appears that the teeth which had been found in the HCF for decades actually belonged to this new species, not Dromaeosaurus.

Acheroraptor’s fossils were found in rocks dated to the extreme end of the Cretaceous Period, 65.5 million years ago, right when the dinosaurs became extinct. It therefore appears that Acheroraptor is the earliest-known raptor, geologically-speaking, being around right up the the point when the asteroid hit.

There are few fossils to go on, consisting of a partial maxilla, a partial dentary, and numerous isolated teeth. Based upon shape and size, paleontologists have determined that Acherorapror was a dromaeosaurid, rather closely related to Velociraptor, and have hypothesized that it may have reached ten feet long. Perhaps in the near future, more fossils will be uncovered which will give us a more complete picture of this animal.

And speaking of pictures, here’s my picture of Acheroraptor! – good segway, right? I further improved the wings from my old Troodon and Ornithomimus drawings, and I made the subject a little more three-dimensional. Rather than standing perfectly sideways, it’s positioned on an angle. I actually drew this guy when I was giving my English students their final exam on Wednesday December 18. I scribbled out the rough sketch when I was in school, and then I polished off the final product when I got home. I had originally intended it to be a full scene with the dinosaur walking along a forest pathway, but I wanted to get this drawing posted right away, and I just didn’t have the time to make a full Henderson-esque setting. Still, I think that it looks fine as is.

Keep your pencils sharp.

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1 Comment

  1. […] Acheroraptor: A new “raptor” dinosaur from the Hell Creek Formation […]

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