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Extinct Animal Questions
Topic Started: Nov 26 2013, 10:24 PM (193,277 Views)
babehunter1324
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Or taken from semifossil already death animals... (It's done in Siberia with Woolie Mammoths).
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CyborgIguana
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Something I've been curious about for a while: I've noticed that Cryolophosaurus reconstructions seem to vary somewhat in body proportions. Some show a rather stocky, carnosaur-like build while others depict it with a more gracile form similar to Dilophosaurus. Which one is more accurate, assuming they're not equally valid interpretations?
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Acinonyx Jubatus
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babehunter1324
Jul 18 2016, 03:08 AM
Or taken from semifossil already death animals... (It's done in Siberia with Woolie Mammoths).
Ivory decays, especially in hot environments like Cyprus. In Siberia the Mammoth tusks are preserved in permafrost and have to be prepared quickly once unearthed, or else they will crack.
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Incinerox
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Āeksiot Zaldrīzoti

The one that puts it as either a basal tetanuran or a dilophosaur. It rolls with Sinosaurus triassicus aka. "Dilophosaurus sinensis". And we're still not 100% sure on that.

Basically, you'd be looking at a longer and more slender animal than the old school bulldog faced carnosaur-like thing they thought it used to be.
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CyborgIguana
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So in short I'm assuming this:

Posted Image

Is a more accurate skeletal reconstruction than this:

Posted Image

Correct?
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Incinerox
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I think the second skeletal is actually the dilophosaur-based restoration. Foreshortening is why it has a blunt face. It's got the distinctive jaw-kink which wouldn't otherwise be there in such a short-faced restoration.

Both are within reason. The one I meshed a while ago is basically like Hartman's only I've kept a more pronounced jaw kink - splitting the difference basically in a crude and speculative manner.

Basically, these are examples of what are wrong:
Posted Image
Posted Image
Posted Image
Posted Image
Posted Image
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Acinonyx Jubatus
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What was the environment of the Permian Red Beds in Texas like?
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CyborgIguana
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It was a wetland environment IIRC, but that's all I can say with certainty.
Edited by CyborgIguana, Jul 19 2016, 02:55 PM.
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Acinonyx Jubatus
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Okay... Does anyone know if it would it have been more open, or forested? What was the climate?

Also, would Eryops have swam using its legs or tail?
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Incinerox
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Regarding Eryops:

Quote:
 
Eryops were among the most formidable early Permian carnivores and perhaps the only ones capable of competing with the dominant synapsids of the time, though because they were semi-aquatic, if not mostly aquatic, as suggested by long bone microanatomy,[8] they probably did not come into frequent competition with synapsids.[9] Eryops lived in lowland habitats in and around ponds, streams, and rivers, and the arrangement and shape of their teeth suggests that they probably ate mostly large fish and aquatic tetrapods.[1] The torso of Eryops was relatively stiff and the tail stout, which would have made them poor swimmers. While they probably fed on fish, adult Eryops must have spent most of their time on land.[1]


As for paleoenvironment, the best comparison to that part of the world at the time would probably be today's Everglades.
Edited by Incinerox, Jul 19 2016, 04:46 PM.
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Acinonyx Jubatus
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Incinerox
Jul 19 2016, 04:46 PM
Regarding Eryops:

Quote:
 
Eryops were among the most formidable early Permian carnivores and perhaps the only ones capable of competing with the dominant synapsids of the time, though because they were semi-aquatic, if not mostly aquatic, as suggested by long bone microanatomy,[8] they probably did not come into frequent competition with synapsids.[9] Eryops lived in lowland habitats in and around ponds, streams, and rivers, and the arrangement and shape of their teeth suggests that they probably ate mostly large fish and aquatic tetrapods.[1] The torso of Eryops was relatively stiff and the tail stout, which would have made them poor swimmers. While they probably fed on fish, adult Eryops must have spent most of their time on land.[1]


As for paleoenvironment, the best comparison to that part of the world at the time would probably be today's Everglades.
So basically it didn't swim at all if it could help it?
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BossAggron
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Formerly Dilophoraptor

Acinonyx Jubatus
Jul 19 2016, 04:48 PM
Incinerox
Jul 19 2016, 04:46 PM
Regarding Eryops:

Quote:
 
Eryops were among the most formidable early Permian carnivores and perhaps the only ones capable of competing with the dominant synapsids of the time, though because they were semi-aquatic, if not mostly aquatic, as suggested by long bone microanatomy,[8] they probably did not come into frequent competition with synapsids.[9] Eryops lived in lowland habitats in and around ponds, streams, and rivers, and the arrangement and shape of their teeth suggests that they probably ate mostly large fish and aquatic tetrapods.[1] The torso of Eryops was relatively stiff and the tail stout, which would have made them poor swimmers. While they probably fed on fish, adult Eryops must have spent most of their time on land.[1]


As for paleoenvironment, the best comparison to that part of the world at the time would probably be today's Everglades.
So basically it didn't swim at all if it could help it?
It would probably paddle with its legs if it needed to swim, it just probably wouldn't have been good.
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Jannick
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Papua merdeka!

I'm no expert, but everything about Eryops' physique screams "ambush predator" to me. I imagine it spending most of its time on the bottom of rivers and lakes, waiting for an unsuspecting fish to swim by and then opening its giant mouth to suck it in, sort of like a cross between an angel shark and a snapping turtle. But this is based solely on external appearance, so I could be completely off :P
Edited by Jannick, Jul 19 2016, 06:00 PM.
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babehunter1324
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Maybe Eryops was adapted for underwater punting. It had relatively barrel shaped body, tall neural processes (not Dimetrodon sized but pretty large), short legs, relatively stout feet, eyes design to look upwards...
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Acinonyx Jubatus
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Jannick
Jul 19 2016, 05:58 PM
I'm no expert, but everything about Eryops' physique screams "ambush predator" to me. I imagine it spending most of its time on the bottom of rivers and lakes, waiting for an unsuspecting fish to swim by and then opening its giant mouth to suck it in, sort of like a cross between an angel shark and a snapping turtle. But this is based solely on external appearance, so I could be completely off :P
This makes sense, except for the presence of huge backwards-pointing spikes on its palate and the robustness of its teeth. It was clearly adapted for gobbling down large prey.

Also, does anyone have a good side-view of its skull?
Edited by Acinonyx Jubatus, Jul 19 2016, 09:25 PM.
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