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Post by thesporerex on Dec 16, 2013 2:03:49 GMT
This thread is dedicated to the poor dinosaurs that are very unpopular or people don't even know it exist. These dinosaurs deserve popularity and have too long lived in the shadow of things like T. rex, triceratops and velociraptor. Post and discuss them here.
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Quiz Time! What's the only genus of lizard that can shoot a jet of slime out of it's tail?
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Post by raptorx863 on Dec 16, 2013 4:32:24 GMT
Bagaraatan ostromi desperately needs some love guys!
Most people have never even heard of this thing, probably because we're still not sure what it is either. The specimen is actually pretty good, preserving a nearly complete tail, limb, and a dentary, but none of the features could be used to successfully identify it. Nonetheless it's HIGHLY important to learning about the ecosystem of the Nemegt Formation. Mostly because of its size and supposed affinities.
Bagaraatan has a long complicated history. It was discovered in 1970 and was stated to just be a ceolurosaur in the first paper describing it. It was formally described and given a name in 1996 by Osmolska, and in that paper was just stated to be an Avetheropoda of uncertain affinities, but noted similarities to avimimids. Two years later, Csiki and Grigorescu noted that it was very similar to maniraptoriformes and placed it among them, but even so, they couldn't identify which one it was closest to. Holtz two years later still found it to be a basal ceolurosaur, but this idea might not be the case anymore as the phylogeny he used is now thought to be outdated. Longrich (2001) found it to be in Maniraptora and similar to alvarezsaurids and avepectorans. In 2002 it suddenly became a basal tyrannosauroid in Holtz's unpublished analyses, but at the same time Coria et. al found it to be a troodontid (although without giving a reason). Rauhut in 2003 found it to be a mainiraptor again and related to paravians, and Holtz again in 2004 found it to be one of the basal most known tyrannosauroids based on shared skeletal features. Carr in 2005 again found it to be a tyrannosauroid, but instead of being basal, it was close to the crown family tyrannosauridae in this study.
A lot of the earlier studies don't seem to hold merit anymore in the wake of new work, but still, that leaves Bagaraatan with either a mainiraptoran or tyrannosauroid identity. So, why's this guy so special? The only known specimen is in a unique size range, about 3-4 meters long, and it shows signs of being mature. If this is true, then Bagaraatan either represents one of two things depending on its identity.
The first option is that it's a Deinonychus or larger-sized raptor running around under the feet of Tarbosaurus (and kicking any out-of-time Velociraptor's asses) as well as being the largest dromaeosaurid known from the northern hemisphere at this time. If it doesn't fall into dromaeosauridae and instead into a more basal family of mainiraptoran, then it would still be significant because it would be one of the largest primitive mainiraptoran as well as being the latest to have existed. The dentary, which has huge recurved teeth in it, doesn't suggest a troodontid, alvarezsaur, therizinosaur, or oviraptorosaur identity: unless he's representing an oddball of one of those groups.
The other identity is just as interesting. That is, that it's the only known non-tyrannosaurid tyrannosauroid from the latest Cretaceous Maastrichtian, as well as being the smallest tyrannosaur from the late Cretaceous period. If the latter is also the case, then the Nemegt Formation is the only dinosaur formation in the world which has three separate tyrannosaur species running around, all a different size and thus would suggest niche partitioning among them. This has so far been the more likely of the two identities, so never forget that there was probably wolf-sized tyrannosaurs running around in Mongolia right before the extinction happened:
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Post by es1001 on Dec 17, 2013 13:05:27 GMT
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Post by thesporerex on Dec 17, 2013 18:12:00 GMT
This is actually a pretty popular find, deviant art was completely bombarded with them and loads of news was posted on them on the internet. Its very popular.
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Post by Allosaurus Rex on Dec 18, 2013 2:58:40 GMT
eocarcharia is pretty poorly known, there's rather few people that really even know it, and it's not really talked about much at all.
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Post by Theropod on Dec 18, 2013 13:59:33 GMT
eocarcharia is pretty poorly known, there's rather few people that really even know it, and it's not really talked about much at all. A lot of people know Eocarcharia actually, this thread is actually about really unknown dinosaurs that even ourselves probably did not hear much about.
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Post by thesporerex on Dec 18, 2013 19:05:00 GMT
Eocarcharia is pretty unknown actually
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Post by Rexog on Dec 19, 2013 1:19:33 GMT
People must know the Dinos of Brazil, when someone say Dino of South America, problaly you will imagine a dinosaur from argentina, Brazil was full of titanosaurs and pterosaurs as well, well, but there is not jurassic fossils here.
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Post by thesporerex on Dec 25, 2013 15:37:38 GMT
Wut teh fuck happened to the Zuni basin tyrannosaur, for those who can't remember I will jog your memory. Remember that tyrannosaur that fought the Nothronychus in planet dinosaur. I have found absolutely no info on it other than its undescribed and what was said on planet dinosaur. Its called Zunityrannus and apparently lived 90 million years ago in new mexico and was about 5 metres long. This would make Zunityrannus the oldest known large tyrannosaur and would make it more than 10 million years older than Lythronax. Other than this no info has been released on it. No skeletals, no taxonomy information, no weight estimates, no nothing. I wish more was released on this animal and it needs more attention if its the oldest larger tyrannosaurs.
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Post by Allosaurus Rex on Dec 25, 2013 16:00:01 GMT
they haven't even gave it a name yet... and i already got some interest on this animal...
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Post by thesporerex on Dec 25, 2013 16:12:10 GMT
they haven't even gave it a name yet... and i already got some interest on this animal... They have apparently gave it a name, its called Zunityrannus.
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Post by Allosaurus Rex on Dec 25, 2013 17:00:07 GMT
planet dinosaur came up with that though. or did i overlook something?
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Post by thesporerex on Dec 25, 2013 17:44:34 GMT
Did they?
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raptorx863
Quiz Time! What's the only genus of lizard that can shoot a jet of slime out of it's tail?
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http://www.youtube.com/user/RaptorX863
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Post by raptorx863 on Dec 25, 2013 18:32:57 GMT
Yeah they made up the name; it's right now just called the Zuni Basin Tyrannosaur in the literature. It will get a proper name when it's described eventually.
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Post by es1001 on Dec 26, 2013 1:59:22 GMT
Im waiting for that day. Also, when are they gonna get off their butts and describe the new Spinosaurid and Ceratosaurid from Australia? And while we are talking about Australia, why aren't there many digs in Australia at all?! If they started doing as much digs in Australia as they did in America, there would be endless species pouring out of the ground. Cmon
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