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| Extinct Animal Questions | |
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| Topic Started: Nov 26 2013, 10:24 PM (193,281 Views) | |
| CyborgIguana | Jun 20 2016, 02:27 PM Post #3196 |
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Even penguins and pinnipeds have far shorter and sparser coats than their closest terrestrial relatives.
Edited by CyborgIguana, Jun 20 2016, 02:31 PM.
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Jun 21 2016, 01:13 AM Post #3197 |
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Penguins actually have ridiculously dense coats. |
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| Incinerox | Jun 21 2016, 04:37 AM Post #3198 |
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Āeksiot Zaldrīzoti
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Yeeeaaah, they basically took the seal route in terms of insulation. Fat deposits and really short, really dense feathers. Cold water origins, you see. |
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| CyborgIguana | Jun 21 2016, 10:16 AM Post #3199 |
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Well, still shorter at least.
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| heliosphoros | Jun 21 2016, 07:38 PM Post #3200 |
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The first penguins did evolve when the earth was much warmer than today... |
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| stargatedalek | Jun 21 2016, 09:22 PM Post #3201 |
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I'm not slow! That's just my moe!
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And didn't they evolve in sub tropical regions at that? |
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| Incinerox | Jun 22 2016, 03:59 AM Post #3202 |
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Āeksiot Zaldrīzoti
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South America's pacific coast, yeah. Still would have been bloody cold to swim in. |
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| Furka | Jun 26 2016, 11:02 AM Post #3203 |
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How does Sphaerotholus fit in our current "view" of Hell Creek Pachycephalosaurs ? |
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| Paleop | Jun 27 2016, 06:37 PM Post #3204 |
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Paleopterix
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potentially a synonym of pachycephalosaurus. it's quite small and known from a cranium. does anyone know any info about these tyrannosaurs? species? papers? https://www.youtube.com/watch?v=_7JJFjcGjZU |
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| Acinonyx Jubatus | Jun 27 2016, 07:32 PM Post #3205 |
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I AM THE UNSHRINKWRAPPER!
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Wouldn't this basically blow the Dracorex/Stygimoloch/Pachycephalosaurus theory out of the water, though? Edited by Acinonyx Jubatus, Jun 27 2016, 07:32 PM.
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| TheNotFakeDK | Jun 27 2016, 08:23 PM Post #3206 |
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200% Authentic
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As far as I can tell, Sphaerotholus buchholtzae is distinct from Pachycephalosaurus. Alaskacephale, from the older Prince Creek formation, looks to be more closely related to Pachycephalosaurus than the contemporary Sphaerotholus buchholtzae does, for instance. That said, I'm curious to see if S. buchholtzae really does represent Sphaerotholus at all. The type species of Sphaerotholus is S. goodwini from the Kirtland formation, 7 million years older than S. buchholtzae from Hell Creek. The specimens are too fragmentary to say, but I wouldn't be surprised in the least if S. buchholtzae turned out to be distinct enough from S. goodwini to warrant a new genus name (Yes I know it's arbitrary and all that, but we gotta be consistent with our distinctions. We wouldn't have Brontosaurus if we weren't). http://www.tandfonline.com/doi/pdf/10.1080/08912963.2015.1137913 Here's the paper, not open-access though I'm afraid. |
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| Acinonyx Jubatus | Jun 27 2016, 08:34 PM Post #3207 |
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I AM THE UNSHRINKWRAPPER!
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While we're on the subject of Pachycephalosaurids, what is the possibility that Stygimoloch is a female rather than a juvenile Pachycepahlosaurus? |
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| BossMan, Jake | Jun 27 2016, 08:49 PM Post #3208 |
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Son of God
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Not a bad idea but that's some pretty big sexual dimorphism not only in the head but size wise as well |
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| CyborgIguana | Jun 27 2016, 08:54 PM Post #3209 |
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Or alternatively our Pachycephalosaurus specimens could simply represent elderly individuals with severely worn down dome spikes. |
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| Incinerox | Jun 28 2016, 09:41 AM Post #3210 |
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Āeksiot Zaldrīzoti
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Considering the size difference, and the ages of Stygi and Draco's specimens, "elderly" doesn't quite cut it. |
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