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Two New Argentinian Theropods
Topic Started: Jun 18 2016, 07:28 PM (812 Views)
Incinerox
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https://drive.google.com/file/d/0B_--wBR50HCraktxckxJMm15ZVk/view

The Huincul Formation has yielded remains of two new theropod genera. One is a carcharodontosaurid, known from an orbital boss. And the other are the partial remains of a, get this, a non-megaraptorid megaraptoran called Aoniraptor libertatum. The remains further support the placement of the megaraptorans within the tyrannosauroidea...

... And apparently it shares affinities with...

*ahem*

DELTADROMEUS AND BAHARIASAURUS.



GET HYPED!
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Acinonyx Jubatus
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I AM THE UNSHRINKWRAPPER!

My brain is not processing this.

Megaraptorans are related to Tyrannosaurs. But they're also related to Deltadromeus and Bahariyasaurus. which are traditionally recovered as Ceratosaurians, all the way on the other side of the theropod family tree.

WAT

AAAAAAAAAAAAAAAAAAAAAAAAGH MY HEAD
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stargatedalek
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I'm not slow! That's just my moe!

I can't be the only one who thought Deltadromeus was considered a Tyrannosauroid this whole time?
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Mathius Tyra
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Rat snake is love... Rat snake is life

Are you implying that Deltadromaeus and Bahariasaurus are actually Tyrannosauroids???
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Incinerox
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stargatedalek
Jun 18 2016, 11:07 PM
I can't be the only one who thought Deltadromeus was considered a Tyrannosauroid this whole time?
Nope.

I've been calling this for the past couple of years too.

It's especially interesting since it parallels with the history of Proceratosaurus itself, having being mistaken for a basal ceratosaurid first...

... Actually second, since "basal coelurosaur" was it's REAL first placement, which makes the whole thing more amusing.
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Even
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What I'm shocked at is how the authors compare Aoniraptor with derived tyrannosaurids... Are they really that deep in the family? Might they have two fingers? What does Australovenator mean in the light of all this? Aren't megaraptorans supposed to be rather basal, non-tyrannosaurid tyrannosauroids?

It is fun to have another distinct clade of theropods haunting Gondwana though... Love the supercontinent's diversity
Edited by Even, Jun 20 2016, 08:57 AM.
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Incinerox
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They say near the end of their commentary on it that there's another species that may fit into the "bahariasauridae" from Patagonia known from some arm parts, including two fingers.

Interesting implication, but I'm slightly skeptical. Megaraptorids have two HUGE fingers, and a very reduced third finger. It's still there though. I assume the third finger missing from that last discussed specimen was just small and lost.

But given how few tail samples we have, and a very interesting lack of comparison to basal tyrannosauroids, and their claim that said features they compared were present in derived tyrannosaurs and openly acknowledge that they are unaware of anything beyond that, means that Megaratorans could go ANYWHERE in the tyrannosauroid family tree at the moment.
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