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| Why are there no Australian Carcharodontosaurids and Notosuchians? | |
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| Tweet Topic Started: Apr 11 2015, 09:32 AM (1,085 Views) | |
| Carcharo | Apr 11 2015, 09:32 AM Post #1 |
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Autotrophic Organism
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Here in Australia, we have various typical Cretaceous Gondwanan fauna assemblages. Such as the following........... Various basal Tyrannosaurs (from small TInmimus to large Rapator) Heaps of Ankylosaurs/Nodosaurs minmi being a good example but I am there are more....... Monotremes Multis An Abelisaurid (that ceratosaur discovered a few years ago in dinosaur cove) A baryonichine spinosaurid The most famous dinosaur here is a Rhabdodont Kakuru a maniraptor most likely being an Unenlagiiid. Or possibly some basal dromeosaurid Heaps of titanosaurs Heaps of unclassified ornithopod taxa with obscure relationships |
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| kingkazma | Apr 11 2015, 10:32 AM Post #2 |
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Apex Predator
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just because we haven't found any, does not mean there aren't any. dino bones are rare, and in a place like OZ and taz, they'd be all the more taxing to search for. |
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| Choeradodis | Apr 11 2015, 01:01 PM Post #3 |
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Herbivore
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There are Neovenatorids though, and they are pretty similar to Carchardontosaurids. Also, Rapator is a maniraptoran? |
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| Carcharo | Apr 11 2015, 05:38 PM Post #4 |
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Autotrophic Organism
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Neovenatorids (now called Megaraptorids) are considered Tyrannosauroids now. |
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| theropod | Apr 11 2015, 08:50 PM Post #5 |
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palaeontology, open source and survival enthusiast
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No, they aren’t. Megaraptora are not the same as Neovenatoridae, defined to include Megaraptor but not Chilantaisaurus, Neovenator, Carcharodontosaurus or Allosaurus. Obviously you need a new definition if you assume they are not neovenatorids themselves. It is currently debated whether they were (as intended when the clade, along with neovenatoridae was named by Benson et al. 2010), or basal tyrannosauroids (as claimed by Porfiri et al. 2014). Either way, Neovenatoridae remains a taxon of carcharodontosaurian allosaurs, including such animals as Neovenator (surprised?) whose allosaurian affinities have never been questioned. However, if Porfiri et al. are right Neovenatoridae only includes two genera, one of whom (Concavenator) is more typically classified as a carcharodontosaurid. –––REFERENCES: Benson, Roger B. J.; Carrano, Matthew T.; Brusatte, Stephen L.: A new clade of archaic large-bodied predatory dinosaurs (Theropoda: Allosauroidea) that survived to the latest Mesozoic. Naturwissenschaften, Vol. 97 (2010); pp. 71-78 Porfiri, Juan D.; Novas, Fernando E.; Calvo, Jorge O.; Agnolín, Federico L.; Zzcurra, Martín D.; Cerda, Ignacio A.: Juvenile specimen of Megaraptor (Dinosauria, Theropoda) sheds light about tyrannosauroid radiation. Cretaceous Research, Vol. 51 (2014); pp. 35-55 |
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| Carcharo | Apr 11 2015, 10:29 PM Post #6 |
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Autotrophic Organism
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Though the Australian ones such as Rapator and Australovenator are Megaraptora and thus would be Tyrannosauroids just as much as Megaraptor. |
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| theropod | Apr 11 2015, 10:37 PM Post #7 |
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palaeontology, open source and survival enthusiast
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Yes, Australovenator is. As for Rapator, it’s not clear whether it is a Megaraptoran, the most recent paper on the matter that mentioned it referred it to Neovenatoridae indet. (Carrano et al. 2012). The question obviously is whether Megaraptor itself is a tyrannosauroid or a neovenatorid. Reference: Carrano, Matthew T.; Benson, Roger B. J.; Sampson, Scott D.: The phylogeny of Tetanurae (Dinosauria: Theropoda). Journal of Systematic Palaeontology, Vol. 10 (2012); 2; pp. 211-300 |
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| Choeradodis | Apr 12 2015, 02:39 AM Post #8 |
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Herbivore
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Oops, I was completely wrong D: |
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