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Extinct Animal Questions
Topic Started: Nov 26 2013, 10:24 PM (193,278 Views)
Mathius Tyra
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Rat snake is love... Rat snake is life

Australovenator, Megaraptorans are known to be fast-running predator, pursuing prey by chasing it down and dispatch with large claws on their hands. Carcharodontosaurs and Allosaurs, iirc are not known to be fast runner and I don't know about Afrovenator.
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BossMan, Jake
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Son of God

I thought Concavenator was thought/calculated to have been one of the fastest theropods around?
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Incinerox
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Āeksiot Zaldrīzoti

In what universe, exactly?
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BossMan, Jake
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Son of God

http://www.seeker.com/top-10-fastest-dinosaurs-1770784673.html

This one...
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Posted Image Flish
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That list also has Tyrannosaurus and Nanotyrannus on it, above Carnotaurus, let's not forget, and not a single Ornithomimid.
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TheNotFakeDK
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200% Authentic

Flish
Jul 16 2016, 10:17 AM
That list also has Tyrannosaurus and Nanotyrannus on it, above Carnotaurus, let's not forget, and not a single Ornithomimid.
To be fair on the last point, the study deliberately excluded "presumed herbivorous or largely herbivorous" theropods for a number of reasons relating to their aim. Naturally, that list decided to drop or completely ignored that part and just went with "Top 10 Fastest Dinosaurs". 10/10 journalism.

Speaking of that list, I'm struggling to figure out just how they ended up with the list they did. The study was done to determine "cursorial limb proportions", that is to say how cursorially adapted the limbs of each species were, NOT to determine the actual speed of the animals. In fact, to quote the paper (bolded for emphasis):

Quote:
 
In this paper, we do not estimate absolute or relative maximum running speeds, but rather quantify and compare theropod limb proportions to assess their relative cursoriality. It is the aim of this study to simply evaluate how strongly the morphology of a particular theropod species has been evolutionarily modified in favor of enhanced cursorial ability, regardless of whether or not the end result of that modification is a maximum running speed that is greater or less than that of other species.

Furthermore, the list presented doesn't even match up with the theropods with the highest CLP scores: a number of taxa included in the CLP score chart are missing, Guanlong is out of order, and Carnotaurus wasn't even included in the dataset! How they got that "Top 10" list is beyond me.

Regardless of all that, Concavenator was recorded as having a positive CPL score, though only just, so its limbs were at the very least suited for cursoriality.
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Incinerox
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Āeksiot Zaldrīzoti

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4728391/

It's this paper, for anyone interested.
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CyborgIguana
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Mathius Tyra
Jul 16 2016, 01:33 AM
Australovenator, Megaraptorans are known to be fast-running predator, pursuing prey by chasing it down and dispatch with large claws on their hands. Carcharodontosaurs and Allosaurs, iirc are not known to be fast runner and I don't know about Afrovenator.
Doesn't Allosaurus at least have a fairly cursorial build IIRC? It may not have been all that fast, but certainly it could run.
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Incinerox
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Āeksiot Zaldrīzoti

According to one paper that compared feeding behaviour and mechanics between Allosaurus and Ceratosaurus (with T. rex as a comparison point), Allosaurus was found to have greater cursoriality AND top speed than Ceratosaurus. While Ceratosaurus was found to have quicker acceleration.

I forgot what it said about T. rex.

It was odd considering that most of the paper talked jaw and neck mechanics.
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Furka
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Would it be possible for you to send a link to the paper ?
Always good to get more infos about those two theropods and how they could have coexisted.
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Acinonyx Jubatus
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I AM THE UNSHRINKWRAPPER!

Any data on the facial innervation of non-mammalian Synapsids?
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CyborgIguana
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Incinerox
Jul 17 2016, 11:48 AM
with T. rex as a comparison point
Of course, when is it ever not? :P
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Incinerox
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Āeksiot Zaldrīzoti

T. rex is a scientifically acknowledged unit of measurement after all:

http://onlinelibrary.wiley.com/doi/10.1002/ar.20563/full

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Acinonyx Jubatus
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I AM THE UNSHRINKWRAPPER!

So I happened to be reading about the history of ancient Tyre, and came across a mention in an old manuscript that said that Tyre imported ivory from Cyprus. This account would have dated to about 500 BC. The only sources of ivory in Cyprus would have been pygmy elephants (Palaeoloxodon cypriotes) and hippos (Hippopotamus minor.) Both of these animals are thought to have gone extinct about 8,500 years before the time period this account described. Is it possible that pygmy elephants survived much longer than we thought?
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heliosphoros
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It is a possibility, but it is equally as likely that the ivory was imported from somewhere else before coming to Cyprus.
Edited by heliosphoros, Jul 17 2016, 10:58 PM.
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