Post by Infinity Blade on Aug 20, 2020 0:01:23 GMT 5
Barosaurus specimens. AMNH 6341 (black), BYU 20815 (blue), and BYU 9024 (dark blue). The last is figured as a C9, which Mike Taylor and Matt Wedel consider to be the most likely serial position (although it's possible that this is wrong).
Oh, and Allosaurus fragilis in green and Saurophaganax maximus in grey.
This image below is hardly a useful size comparison given the perspective of the shot, I just really wanted to show off this picture, which also shows the differences between mammoth and mastodon teeth.
Post by Supercommunist on Oct 19, 2020 3:09:27 GMT 5
I wonder how giant crocodilians like deinosuchus moved on land. Modern extant crocodiles are pretty slow on land so obviously their much larger extinct relatives were obviously quite sluggish themselves, but I can't imagine them being completely unable to high-walk otherwise I doubt they'd grow so large in the first place.
Post by Infinity Blade on Oct 19, 2020 17:19:26 GMT 5
I don't know about Deinosuchus, but we know that Purussaurus evolved an extra sacral bone (a functional dorsosacral) that articulated with the pelvis to help with weight support. It also had a more vertically oriented pectoral girdle and a femoral head that would have experienced low torsional stress. So there were some postural changes that accompanied greater body size.
Mind you, this was for P. mirandai, which was far from the biggest species (~2,600 kg). I assume P. brasiliensis would have had these same features too. Maybe Deinosuchus did some of the same things, but I don't know for sure.
lionclaws: Large gape enables predation on large animals, but it does not preclude predation on smaller ones. Especially when the animal has two sets of lethal tools that cannot be used simultaneously, as carcharodontosaurs do.
Sept 24, 2023 2:35:14 GMT 5
Infinity Blade: Actually, I'm sure carnosaurs in general could replicate the bone processing feats Allosaurus did, but yeah, you get the point.
Sept 24, 2023 2:01:40 GMT 5
Infinity Blade: Carcharodontosaurids seem to have been bigger-headed and much shorter-armed, I feel like they deviated more from the original theropod body plan/mode of predation.
Sept 24, 2023 1:43:49 GMT 5
Infinity Blade: Supercommunist I'm going to say allosaurids. Slicing teeth that could still process bone, moderately large arms with huge claws, and probably weren't limited to just sauropods (we know Allosaurus hunted stegosaurs too).
Sept 24, 2023 1:42:36 GMT 5
Supercommunist: lionclaws, yeah I suppose Carcharodontosaurids do tend to have similar builds which suggest it was verastile body plan but I always thought their huge jaw gape was specialized for killing much larger animals.
Sept 24, 2023 1:00:09 GMT 5
Supercommunist: By carnosas I meant, Carcharodontosaurids but that word took up too muchn space, lol.
Sept 24, 2023 0:56:05 GMT 5
dinosauria101: I'll dedicate a shout or two to that 24+ year old crooked spine tumor mouth pictus catfish that recently had to be put down. RIP.
Sept 24, 2023 0:46:29 GMT 5
dinosauria101: I don't mean to interrupt anything but....
Sept 24, 2023 0:45:47 GMT 5
lionclaws: Actually, I think that the carcharodontosaurs ran the whole gamut of available prey. Anything they can Tower over could be dispatched with the powerful claws, and anything too large for that can be exsanguinated.
Sept 24, 2023 0:44:54 GMT 5
Supercommunist: You know I never thought about it before, but which of the giant theropods do you think is the most "generalist" predator? The really famous ones seem to be specialists. Trex preyed on well-armed prey, carnosaurs were saurpod killers, spino ate fisj, ect.
Sept 24, 2023 0:38:49 GMT 5
Infinity Blade: I doubt I’ll be able to contribute much, but aye
Sept 24, 2023 0:03:47 GMT 5
lionclaws: If you think I should start a Google Sheets document for all of us to contribute to, where we can all put measurements of theropod femoral, say "aye."
Sept 23, 2023 23:28:17 GMT 5
tyrannasorus: How well does the amount of stress the mandible can withstand translate to how high the animals bite force is?
Sept 17, 2023 21:14:29 GMT 5
tyrannasorus: Google gives a range of 0.5-1 inches of thickness depending on species, with their belly’s being considerably thinner
Sept 17, 2023 11:20:08 GMT 5
Supercommunist: Any idea how thick crocodilian skin is on average? According to some iffy sources the belly skin is often 1mm thick but I think they have thinner skin on their belies.
Sept 17, 2023 10:37:01 GMT 5