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| Extinct Animal Questions | |
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| Topic Started: Nov 26 2013, 10:24 PM (193,280 Views) | |
| stargatedalek | Jun 28 2016, 03:02 PM Post #3211 |
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I'm not slow! That's just my moe!
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I agree, but it's still an interesting concept. |
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| CyborgIguana | Jun 28 2016, 05:31 PM Post #3212 |
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I'm just throwing some speculations out there, not saying I'm likely to be right. |
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| Acinonyx Jubatus | Jun 28 2016, 08:57 PM Post #3213 |
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I AM THE UNSHRINKWRAPPER!
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Do we know anything about Anomalocaridid skin texture or structure? |
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| BossAggron | Jun 28 2016, 08:58 PM Post #3214 |
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Formerly Dilophoraptor
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I don't know much on them but i'd expect something similar to crustaceans or other aquatic arthropods of some kind |
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| Acinonyx Jubatus | Jun 28 2016, 08:59 PM Post #3215 |
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I AM THE UNSHRINKWRAPPER!
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I don't think they had exoskeletons, did they? I was thinking more like velvet worms. |
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| Incinerox | Jun 28 2016, 09:48 PM Post #3216 |
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Āeksiot Zaldrīzoti
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They're substantially more derived than velvet worms, and form the sister clade to Arthropoda. They fit snugly between multiple clades of invertebrate with chitinous dermal armour of some degree. So that's what you'd see. Think tardigrades, but MASSIVE. |
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| BossAggron | Jun 28 2016, 09:50 PM Post #3217 |
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Formerly Dilophoraptor
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I don't exactly know, though a lot of depictions have exoskeletons from what I can tell, not sure how up to date they are though. |
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| Paleop | Jul 4 2016, 01:06 PM Post #3218 |
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Paleopterix
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are there any North American therizinosaurs aside from Nothronychus graffami, Nothronychus mikinlii, falcarius, and the cantwell therizinosaur? |
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| TheNotFakeDK | Jul 4 2016, 01:24 PM Post #3219 |
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200% Authentic
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There's also Martharaptor greenriverensis. |
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| BossAggron | Jul 4 2016, 06:23 PM Post #3220 |
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Formerly Dilophoraptor
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When did Kneecaps first appear? Just a random fact my brain wanted to know. |
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| Acinonyx Jubatus | Jul 5 2016, 08:44 PM Post #3221 |
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I AM THE UNSHRINKWRAPPER!
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They appear to be basal to all living mammals, including Dryolestoids and Monotremes. (Notoryctes was reclassified as a Dryolestoid, right? I'm not imagining things?) I don't see them in skeletons of Cynodonts or basal Mammaliaformes, but it could be that they are poorly ossified and preserved (not surprising given the size of many such creatures.) Changing the subject, I have a hypothesis. I know the Yixian formation, at least, was seasonally very cold and probably got a lot of snow. I assume that Tiaojishan was much the same, since the animal life was so similar. Would it be plausible that the funny foot-wings you see in small Maniraptors like Anchiornis be used as Snowshoes? Also I think that, due to the HUGE preservation bias (100% of specimens found in sleeping posture!) Mei long hibernated in winter. Edited by Acinonyx Jubatus, Jul 5 2016, 08:58 PM.
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| heliosphoros | Jul 5 2016, 09:11 PM Post #3222 |
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Tritylodontids at least seem to have them, so I assume they are an ancient mammaliaform condition. |
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| stargatedalek | Jul 6 2016, 01:05 PM Post #3223 |
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I'm not slow! That's just my moe!
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It got snow but it probably didn't have snowy winters like North America does. It got quite cold and most likely snowed on occasion but compared to modern America it would have been more like an extended fall. As interesting as the idea is they don't extend nearly far enough to form functional snowshoes. These were also very light animals to begin with, (even large eagles several times heavier can hop along snow today and only sink minimally) so they probably didn't need them. 100% of two specimens is a huge preservation bias now? Or are there more specimens Wikipedia doesn't mention? You're also forgetting the chemistry of the rocks it was found in indicating they were asphyxiated and then quickly covered by volcanic ash. They may not even have been truly sleeping, but rather shielding themselves before being rendered unconscious by volcanic gases. Edited by stargatedalek, Jul 6 2016, 01:06 PM.
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| Acinonyx Jubatus | Jul 6 2016, 01:14 PM Post #3224 |
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I AM THE UNSHRINKWRAPPER!
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Well, darn. I thought I was on to something there. Oh well, thank you for pointing that out. And I was joking about the preservation bias on the Mei thing. |
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| stargatedalek | Jul 6 2016, 06:38 PM Post #3225 |
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I'm not slow! That's just my moe!
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Aah ok, I didn't catch on ![]() I also don't trust Wikipedia completely. |
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