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Extinct Animal Questions
Topic Started: Nov 26 2013, 10:24 PM (193,288 Views)
Paleodude
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ex-Krampus

BossMan, Jake
May 22 2016, 01:15 PM
Let's say a new dinosaur was found in...The Cedar mountain formation or atleast that general area but the animal is either older or younger then the current formation. Would this extend the date of the formation, or would a newer formation be named?

Also
Posted Image
Do we know if gigantoraptor had those kind of teeth inside its mouth?
Last time I checked we only had the lower jaw so it isn't entirely definitive (at least from what I could find) however the shape of the jaw is very similar to that of oviraptorids like Citipati that we do have evidence of preening teeth similar to the ones in Planet Dinosaur. Here's some pretty good skeletals of both the skulls for comparison, notice the shape of the lower jaws.
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Mathius Tyra
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Rat snake is love... Rat snake is life

Are these preening teeth a set of modified tooth or just something that is analogue in appearance to tooth?
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Paleodude
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ex-Krampus

Mathius Tyra
May 23 2016, 11:48 AM
Are these preening teeth a set of modified tooth or just something that is analogue in appearance to tooth?
Analogous bony projections from the palate, true teeth were lost earlier in oviraptorid evolution in favor of a beak;
Quote:
 
"A very curious toothlike projection extends from the back of the bones that roof the mouth (the palate)." (Dinosaurs of the Flaming Cliffs, Michael Novacek)
Source: https://books.google.com/books?id=KZTR5TIo9cEC&pg=PT324&dq=oviraptor+palatal&hl=en&sa=X&ei=MlFcVNWDAfWKsQS2_4CIDw#v=onepage&q=oviraptor%20palatal&f=false
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Incinerox
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Āeksiot Zaldrīzoti

Honestly, the whole bit about them being used for preening is news to me. Why was it necessary?
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heliosphoros
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Birds preen fine without weird teeth.

The projections still baffle most people, AFAIK. The old "oviraptors are ovivores" idea already stretched their use, but now that we know that they were herbivores...

Maybe they were used like muntac deer fangs?
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stargatedalek
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I'm not slow! That's just my moe!

Remember that a birds beak, even a very rounded one like a parrot, still ends in a distinctive hook or point. Oviraptorosaur beaks however were rounded at the tip, almost like a pufferfish, and so may not have sufficed for preening.
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heliosphoros
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I've seen plenty of oviraptorosaur jaw ends and they seem hooked to me.
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Incinerox
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Āeksiot Zaldrīzoti

The bone cores of oviraptorosaur jaws does not reflect the possible extent of keratin in life.

Otherwise a large number physically could not close their mouths properly.
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Paleodude
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ex-Krampus

Sorry to cause a ruckus, just called them preening teeth as that what Star said they were used for and I just like the name. As for being used like Muntajac, considering how far back the projections were in the mouth they were most likely covered mostly in gum and probably wouldn't be very visible. If anything I'm guessing they helped keep large food down.
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Paleop
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Paleopterix

how large could a theropod be before it couldn't jump (assuming that ability was lost with size)
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CyborgIguana
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I assume it'd have more to do with proportions than size (though granted proportions tend to change with size).
Edited by CyborgIguana, May 23 2016, 10:06 PM.
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BossMan, Jake
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Son of God

How old could a large theropod like T-Rex get? I've heard they died young at ages like 22, to maxing out at 45 years

Not just looking for Rexy in particular but really any large theropod
Edited by BossMan, Jake, May 24 2016, 12:14 AM.
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Incinerox
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Āeksiot Zaldrīzoti

Because T. rex is our best documented large theropod save for Allosaurus, it's the best one to use to answer said question.

Sue died at 26 years 9 months. Scotty was pushing 30.

So I'd say 30 was OLD for a large theropod.
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BossMan, Jake
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Son of God

Questions about Leptoceratops
1. Is it possible that for short amounts of time they could walk bipedal?
2. I had an old book and it stated that leptoceratops fossils are known from Australia. Was this a misidentification or complete inaccuracy?
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babehunter1324
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BossMan, Jake
May 25 2016, 02:30 PM
Questions about Leptoceratops
1. Is it possible that for short amounts of time they could walk bipedal?
2. I had an old book and it stated that leptoceratops fossils are known from Australia. Was this a misidentification or complete inaccuracy?
1. Judging by Scott Hartman, sketal, quite unlikely.
Posted Image

2. While as far as I know the remains that were found in Australia might turn out to be from a Ceratopsid, it certainly wouldn't be Leptoceratops.
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