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| Extinct Animal Questions | |
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| Topic Started: Nov 26 2013, 10:24 PM (193,435 Views) | |
| CyborgIguana | Dec 12 2014, 10:01 PM Post #886 |
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It's possible, but rather unlikely IMO. |
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| Rush2112 | Dec 13 2014, 01:17 AM Post #887 |
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I'm only just entering this, but basically a footprint to an animal similar in size and gait was discovered in Alask? To be honest it was only a matter of time. Cold weather digs are finally becoming more available and I would be surprised not to see evidence of this migration along the migration route. |
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| CyborgIguana | Dec 13 2014, 12:52 PM Post #888 |
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I highly doubt this is indicative of a migration, since this footprint is separated from those of Nothronychus by over 20 million years. |
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| Taurotragus | Dec 13 2014, 02:26 PM Post #889 |
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How did Paleogene and Neogene periods divide the Tertiary period(yes I know the term is outdated)? And what's the likeliness of Abelisaurids having small spines on their backs similar to the ones diplodocus had? Edit:Figured out the first question, still need an answer to the second question. Edited by Taurotragus, Dec 13 2014, 03:02 PM.
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| Rush2112 | Dec 13 2014, 05:06 PM Post #890 |
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No no, the migration from Asia to North America, not a Nothronychus migration from New Mexico. Sorry for the ambiguity. Until now it has been assumed that the Asian species traveled over the Alaskan land bridge and now we have some (quite literally) hard evidence.
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| CyborgIguana | Dec 13 2014, 05:16 PM Post #891 |
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Oh, sorry. This would indeed be evidence of such a phenomenon. |
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| Furka | Dec 17 2014, 02:54 PM Post #892 |
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How many chances are there that Ceratosaurus nasicornis and C. dentisulcatus are the same species ? Wiki doesn't really help on the matter, and Hartmann says it's possible to him, but it's just an opinion. |
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| DinoBear | Dec 17 2014, 04:28 PM Post #893 |
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Decently high, I say. C. dentisulcatus has the only known material of an adult Ceratosaurus , which means that even if it was distinct it would be our best model for an adult nasicornis |
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| Yutyrannus the second | Dec 27 2014, 11:53 AM Post #894 |
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How do accurate Sauropods, Stegosaurids, Ankylosaurs, Ceratopsians and Pachycephalosaurians actually look like? |
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| CyborgIguana | Dec 27 2014, 12:04 PM Post #895 |
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Well, considering just how diverse all the dinosaur families you just brought up are, that's a difficult and rather vague question to answer. |
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| Rush2112 | Dec 28 2014, 03:08 PM Post #896 |
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That is tough. Ceratopsids are incredibly dverse. Large with horns (Triceratops), small with no horns (Protoceratops), medium sized with spikes (Styracosaurus). That's just a few. Don't even get started on Sauropods... Definately need specifics. |
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| Incinerox | Dec 28 2014, 03:14 PM Post #897 |
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Āeksiot Zaldrīzoti
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... Each one of those would require ESSAYS to answer... |
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| Bill | Dec 29 2014, 04:24 AM Post #898 |
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here's a more specific question. i want to completely clear myself of how a triceratops look, we can mostly agree on it's shape, but the quills are what cause debates. any paleo fan can pretty much agree that triceratops likely to have quills, but exactly how much? and where? i see dozens of re-construction with different quills formation, like this with long quills like porcupine:![]() some are rather smaller and less dense: ![]() and some look more like spikes rather than quills: ![]() and i think i saw a reconstruction with fully coated quills too. so which one of them is the more plausible? and why? |
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| Incinerox | Dec 29 2014, 05:19 AM Post #899 |
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Āeksiot Zaldrīzoti
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The last one by far. The "quill" hypothesis shown in the other two are based off the ones present on Psittacosaurus's tail, and the presence of unusual round, knob shaped scales on trike skin. The problem is that the quills of psittacosaurus are totally different structures which erupted from the skin differently. They weren't supported by knob shaped scales, they were arranged in a more typical bristle like manner (as opposed to sparsely arranged large scales), and they were arranged in a single row over a portion of the tail (which again, is not what you see in trikes). Then you have to consider that trikes are the exception to a fairly well documented rule. Other chasmosaurines and all known centrosaurine skin show the right mosaic type scales, and the right arrangement of larger, round scales, but only trike has modified their round scales into weird, protruding things. What separates them from psittacosaur quills is that they're full on scales. They aren't frayed scales like Kulindadromeus. They aren't long, thin bristles like psittacosaurus. They're genuine, solid scales. The thing is that we have no idea if the scales served as a supporting structure for a bristle (which is completely undocumented in other animals), or if they just looked like that in life. But the quill hypothesis is tenuous and based entirely on "this very primitive species had it" rather than looking to its closer, quill-less relatives. You also find that quills and genrally feathered structures tend to be associated with a certain type of scaly texture, one that psittacosaurus had, Kulindadromeus had, theropods had, but NOT seen in trike mummies. My personal line of thinking is that if you consider the 65 million years it spent being worn down and emaciated, it's likely those scales could have looked a bit fuller and perhaps sharper too. A bit like some well armed lizards today, only maybe not as extreme. ![]() ![]() I think I had a rant about this very topic before somewhere on this very forum. If I find the post, I'll forward you to it. Edited by Incinerox, Dec 29 2014, 05:20 AM.
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| Bill | Dec 29 2014, 08:16 AM Post #900 |
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nice answer! noted! is there any article about the skin impression of the trike that you can link me to? google is not very helpful when it comes to paleontology
Edited by Bill, Dec 29 2014, 08:17 AM.
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Until now it has been assumed that the Asian species traveled over the Alaskan land bridge and now we have some (quite literally) hard evidence.











