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Extinct Animal Questions
Topic Started: Nov 26 2013, 10:24 PM (193,436 Views)
CyborgIguana
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In other words pretty much all the places you'd expect to see quills. ;)
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DinoBear
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Ah, got it. (can still give them beards, though :P )
Edited by DinoBear, Dec 11 2014, 10:55 PM.
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CyborgIguana
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Guess there's nothing wrong with that as a stylistic choice. :P
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Incinerox
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Āeksiot Zaldrīzoti

stargatedalek
Dec 11 2014, 07:22 PM
DinoBear
Dec 11 2014, 06:37 PM
Incinerox
Dec 11 2014, 04:03 AM
DinoBear
Dec 10 2014, 08:18 PM
Any reason to not do so? (that's what I originally meant, sorry that it wasn't clear)
Well for ceratopsids, the normal integument are large round scales surrounded by rosettes of smaller, mosaic-pattern scales. Cladistically speaking, that's the norm - it's seen across BOTH Chasmosaurines AND Centrosaurines. Among the advanced ceratopsians, Triceratops itself seems to be the oddball. That in itself is reason enough to suggest that this was the condition in the common ancestor between both clades.

For any ceratopsid to have psittacosaurus-like quills, it'd need to re-evolve them, which is extremely unlikely.
Yes, but do these impressions come from a significant enough portion of the body to disprove quills all together?
not all together, but none along the upper back, flanks, or tail
They had crocodillian like rectangular scales on their throats and upper chest too. Presumably, their whole belly area had those types of scales.
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Mathius Tyra
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Rat snake is love... Rat snake is life

From the footprints found in Alaska... Is it now safe to say that there was some kind of unknown Therizinosaur living in Cretaceous Alaska?

And is there any estimation about the size of it?(estimate from the footprint)
Edited by Mathius Tyra, Dec 12 2014, 08:35 AM.
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Yi Qi
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Mathius Tyra
Dec 12 2014, 08:31 AM
From the footprints found in Alaska... Is it now safe to say that there was some kind of unknown Therizinosaur living in Cretaceous Alaska?

And is there any estimation about the size of it?(estimate from the footprint)
The footprints were definately therizinosaurian, their footprints are....what can i say... rather distinctive from most theropods as a reflection of their more upright gait.

plus there is a therizinosaur astragallus from hell creek, so its very likely there were atleast some therizinosaurs roaming north america by the end of the cretaceous.

Edited by Yi Qi, Dec 12 2014, 09:22 AM.
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Furka
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And I remember reading somewhere of Therizinosaur remains from Dinosaur Park too.
If only we had more materials about them ...
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Incinerox
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Āeksiot Zaldrīzoti

Considering that the presence of therizinosaurs has long been known in North America and Asia, they'd have HAD to occur in Alaska at some point. That said, I wonder if it was cold enough for the thing to be genuinely WOOLLY. That'd be a fun concept. I mean, we already know from the rather basal Beipiaosaurus that at least that had extensive shaggy coating on the neck and possibly had a beard but who knows.

It makes me happy that there's signs of therizinosaurs in Hell Creek. That was something I didn't know.

If there's any further info on the alaskan footprint, link me. I might be able to help here.
Edited by Incinerox, Dec 12 2014, 01:10 PM.
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Yi Qi
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Incinerox
Dec 12 2014, 01:10 PM

If there's any further info on the alaskan footprint, link me. I might be able to help here.
Posted Image

compare with Nothronychus

Posted Image

The outline is virtually the same..


Edited by Yi Qi, Dec 12 2014, 02:21 PM.
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CyborgIguana
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So, we're most likely looking at an animal of a similar size and profile to Nothronychus?
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Yi Qi
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CyborgIguana
Dec 12 2014, 02:41 PM
So, we're most likely looking at an animal of a similar size and profile to Nothronychus?
I'd say most likely yes, tough we can't really be sure.
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CyborgIguana
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BTW I thought therizinosaurs were unusual among theropods in having four toes on each foot. I only see three on both of those footprints.
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Furka
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You can see the fourth, small one on the right of the first (I think).
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Yi Qi
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CyborgIguana
Dec 12 2014, 02:43 PM
BTW I thought therizinosaurs were unusual among theropods in having four toes on each foot. I only see three on both of those footprints.
Posted Image

there are four toes on both (altough notably less visible on the nothro, due erosion).
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Posted Image Guat
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Is there any possibly of soft integument in pachycephalosaurids?
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