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Extinct Animal Questions
Topic Started: Nov 26 2013, 10:24 PM (193,301 Views)
nashd1
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nashd1
Apr 10 2016, 01:23 PM
Incinerox
Apr 9 2016, 07:06 AM
Acinonyx Jubatus
Apr 8 2016, 06:08 PM
http://antediluviansalad.blogspot.ca/

Lots of good stuff- Plesiosaur physiology, social behaviour and ecology, Ziphodont theropod jaw mechanics, and some posts on Spinosaurus locomotion and terrestrial capabilities.
Oh THIS guy.

I find his blog very hit-or-miss. Like, none of what I've seen is, in my opinion, outright brash or silly, but he oversteps his what would otherwise be very reasonable logic. For example, he posts very reasonable arguments for an underwater-walking Spinosaurus, and also makes a strong case for it being clumsy on land, and his speculation on soft tissue is within reason... But then he oversteps it all by implying it could only slide around on its belly, which ignores the difficulty of trying to slide an awkwardly shaped 9 ton block of meat and bone over uneven terrain using what he himself implies are legs too weak to do so.

It's a good dose of speculative thinking that I enjoy in paleoreconstruction, but I'd take it all with a pinch of salt.

I think it was he that wrote a blog on the evolutionary arms races between sauropods and araucarias, and the solid throats of stegosaurids and the spiny leaves of cycads that protect the fruiting cones in the middle. I liked those arguments.
Hi Duane Nash (Oh THIS guy) from antediluvian salad here. As i am always on the lookout for critique or comments and ways to improve my thinking or ideas if I could muster some more detailed analysis from Incinerox or others that would be of much value. Or better yet take them to my comments section where they will be viewable by visitors to my site. While I do imbue my posts with lots of speculation it is defensible and within the realm of what animals do today.

I do feel my take on Spinosaurus belly sliding is taken out of context and misrepresented by Incinerox. According to Ibrahim et al. the ilium was diminished as well as knee joint all of which are necessary for bipedal stance - at the same time the site of attachment for the caudemofemoralis muscle was greatly enlarged. This creates a bit of an enigma - an animal that can kick back hard but does not appear that well equipped to stand up on terra firma. This same kick back motion would be used to facilitate belly sliding somewhat similar to penguins or loons. The legs were tremendously strong in the lateral realm but substantially weaker in the vertical realm. The main substrate it was doing this across was slippery tidal muds and some sands. In this view it was not traversing difficult terrestrial terrain and is fairly limited (and vulnerable) in that regard.

Best,

Dune Nash
and this:My Webpagehttp://dontknowwhattodraw94.deviantart.com/art/Punting-602255422
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Furka
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Just a tip nashd1, double posting is against the site rules, you can edit your previous post if you want to add content.

Other than that, thanks for your opinions on the matter, they really give food for the brain,.
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BossMan, Jake
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Son of God

Three questions here,
1) Was leedsicthys the largest Mesozoic fish known so far?
2) Were the Caenagnathidae primarily herbivorous?
3) Since Ozraptor is now considered a Abelisaur would it have resembled a typical cretaceous variety, or would it have been more primitive looking? (Like different skull shape, longer arms etc.)
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PrimevalBrony
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Youtuber. Combat robotics fan

1) To my current knowledge, yes. The closely related Bonnerichthys was close
2) I believe so. Definitely the larger ones would be more apt for it. But still omnivores.
3) I'd say more like Eoabelisaurus in looks
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Posted Image Flish
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nashd1
Apr 11 2016, 03:53 AM
nashd1
Apr 10 2016, 01:23 PM
Incinerox
Apr 9 2016, 07:06 AM
Acinonyx Jubatus
Apr 8 2016, 06:08 PM
http://antediluviansalad.blogspot.ca/

Lots of good stuff- Plesiosaur physiology, social behaviour and ecology, Ziphodont theropod jaw mechanics, and some posts on Spinosaurus locomotion and terrestrial capabilities.
Oh THIS guy.

I find his blog very hit-or-miss. Like, none of what I've seen is, in my opinion, outright brash or silly, but he oversteps his what would otherwise be very reasonable logic. For example, he posts very reasonable arguments for an underwater-walking Spinosaurus, and also makes a strong case for it being clumsy on land, and his speculation on soft tissue is within reason... But then he oversteps it all by implying it could only slide around on its belly, which ignores the difficulty of trying to slide an awkwardly shaped 9 ton block of meat and bone over uneven terrain using what he himself implies are legs too weak to do so.

It's a good dose of speculative thinking that I enjoy in paleoreconstruction, but I'd take it all with a pinch of salt.

I think it was he that wrote a blog on the evolutionary arms races between sauropods and araucarias, and the solid throats of stegosaurids and the spiny leaves of cycads that protect the fruiting cones in the middle. I liked those arguments.
Hi Duane Nash (Oh THIS guy) from antediluvian salad here. As i am always on the lookout for critique or comments and ways to improve my thinking or ideas if I could muster some more detailed analysis from Incinerox or others that would be of much value. Or better yet take them to my comments section where they will be viewable by visitors to my site. While I do imbue my posts with lots of speculation it is defensible and within the realm of what animals do today.

I do feel my take on Spinosaurus belly sliding is taken out of context and misrepresented by Incinerox. According to Ibrahim et al. the ilium was diminished as well as knee joint all of which are necessary for bipedal stance - at the same time the site of attachment for the caudemofemoralis muscle was greatly enlarged. This creates a bit of an enigma - an animal that can kick back hard but does not appear that well equipped to stand up on terra firma. This same kick back motion would be used to facilitate belly sliding somewhat similar to penguins or loons. The legs were tremendously strong in the lateral realm but substantially weaker in the vertical realm. The main substrate it was doing this across was slippery tidal muds and some sands. In this view it was not traversing difficult terrestrial terrain and is fairly limited (and vulnerable) in that regard.

Best,

Dune Nash
and this:My Webpagehttp://dontknowwhattodraw94.deviantart.com/art/Punting-602255422
I'm no expert on Theropod anatomy, but is it not possible for Spinosaurus to have held its knees tightly to its torso and walked similar to a cormorant? I would think this would shift its center of mass and where it's being supported by quite a bit given the correct angle.
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54godamora
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how big would a dakosaurus be compared to a 4 year old boy? and can I have a picture of its teeth?
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Furka
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Posted Image

Just one of the many available pics of its teeth.
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Paleodude
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ex-Krampus

Quote:
 
how big would a dakosaurus be compared to a 4 year old boy?


With the average height of a 4 year old male being around 1.1m in height when compared to an average fully grown Dakosaurus the kid would be about 3.9 meters shorter if layed side to side or 22% of the Dakosaurus' length.
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54godamora
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so what is the length, height, and weight of the largest specimen of an arctodus?
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Incinerox
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Āeksiot Zaldrīzoti

Learn to use google.
https://en.m.wikipedia.org/wiki/Short-faced_bear#Species
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BossMan, Jake
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Son of God

After reading the information on the Short Faced bear I'm curious, would they have been more aggressive then modern bears seeing as how they were fully carnivorous?
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Acinonyx Jubatus
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I AM THE UNSHRINKWRAPPER!

BossMan, Jake
Apr 13 2016, 09:51 AM
After reading the information on the Short Faced bear I'm curious, would they have been more aggressive then modern bears seeing as how they were fully carnivorous?
It's possible. As far as I'm aware there's not much of a correlation between carnivorousness and aggression.
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BossMan, Jake
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Son of God

Well one would think that a large carnivore who is the dominant predator would need to be aggressive to try and defend their kills
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babehunter1324
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That and the fact that Arctodus being more carnivorous than modern bears is debatable.

Sure, according to studies meassuring the isotopic count in short faced bears it had an hypercarnivorous diet, but according to latter studies on the morphology of ursids as well as teeth microwear studies Arctodus did not match the profile of an hypercarnivorous ursid. in fact the teeth microwear patterns matched Tremarctos ornatus the most. I would be somewhat warry though since the similarities in tooth microwear might be a result of the closer taxonomical relation of both genus relative to the other species of Ursids studied than with the actual diet, even if that was the case the ammount of wear in the teeth do not correlate to the expected pattern on a osteophagus mammal, so it seems it didn't gnaw on bones with any regularity.

Also, yeah. Higher levels of carnivory =/=agression, as a matter of fact grizzly bears tend to be more agressive than polar bears to humans, and the former tend to dominate the latter over carcasses, even when they are greatly outsized. That said if Artodus simus was really a full flown kleptoparasit (and for the record I doubt any land mammal that size could sustain a fully scavenging diet) then you would expect it to be very aggresive around food.
Edited by babehunter1324, Apr 13 2016, 02:51 PM.
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Furka
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Do we know what did Richardoestesia look like "exactly" ? I've seen it restored in so many ways, from dromaeosaur to mircoraptor-like, and I think even Unenlaginae.
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