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Extinct Animal Questions
Topic Started: Nov 26 2013, 10:24 PM (193,281 Views)
CyborgIguana
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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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Posted Image Flish
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Penguins actually have ridiculously dense coats.
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Incinerox
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Āeksiot Zaldrīzoti

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
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Well, still shorter at least. :P
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heliosphoros
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The first penguins did evolve when the earth was much warmer than today...
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stargatedalek
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I'm not slow! That's just my moe!

And didn't they evolve in sub tropical regions at that?
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Incinerox
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Āeksiot Zaldrīzoti

South America's pacific coast, yeah.

Still would have been bloody cold to swim in.
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Furka
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How does Sphaerotholus fit in our current "view" of Hell Creek Pachycephalosaurs ?
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Paleop
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Paleopterix

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
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Paleop
Jun 27 2016, 06:37 PM
potentially a synonym of pachycephalosaurus. it's quite small and known from a cranium.
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
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200% Authentic

Furka
Jun 26 2016, 11:02 AM
How does Sphaerotholus fit in our current "view" of Hell Creek Pachycephalosaurs ?
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).

Paleop
Jun 27 2016, 06:37 PM
does anyone know any info about these tyrannosaurs? species? papers?

https://www.youtube.com/watch?v=_7JJFjcGjZU
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
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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
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Son of God

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
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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
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Āeksiot Zaldrīzoti

Considering the size difference, and the ages of Stygi and Draco's specimens, "elderly" doesn't quite cut it.
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