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Post by prehistorican on Apr 14, 2019 3:12:27 GMT 5
Alright that makes sense, thanks for the clarification. I just never seen the 50% estimate. Yeah there would be crazy frenzy in the medias, if they published an already unsure estimate and upper estimate, and even for Lilstock there was a bit of that as well.
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Post by Infinity Blade on Jul 11, 2019 16:50:19 GMT 5
theropod, quick question. On the previous page, prehistorican said that Temnodontosaurus would have weighed ~10t. Is this accurate? And if so, at what body length. I think the BBC bite force webpage estimates the one with the ~2m skull between 8 to 10m in total body length, but I don't know if those proportions are correct (8m TL would imply the skull being a quarter of total body length).
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Post by theropod on Jul 12, 2019 15:53:19 GMT 5
About 9m would be most realistic based on T. platyodon’s proportions. This species is quite long-skulled, a T. burgundiae of comparable total length only has a 1.6m skull.
About the 10t, that depends on the Temnodontosaurus in question. As discussed before, some may have gotten far larger than this, whereas the typical representatives of the well-known species were considerably smaller.
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Post by Infinity Blade on Jul 12, 2019 16:20:37 GMT 5
Okay, so that's actually consistent with what the BBC webpage claimed. What would be a reasonable mass for that 9m specimen? I think I vaguely remember reading that other species, e.g. T. eurycephalus, were smaller than that, but I don't really know much about Temnodontosaurus other than varying prey specialization among the different species.
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Post by theropod on Jul 16, 2019 20:07:02 GMT 5
I think quite a bit less than 10t
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Post by elosha11 on Jul 16, 2019 23:29:54 GMT 5
I agree with Theropod. A 9 meter orca would likely weigh substantially less than 10 tons, and I highly doubt Temnodontosaurus would be bulkier at the same length as an orca.
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Post by spartan on Jul 27, 2019 15:36:41 GMT 5
Do Orcas get that gracile at greater lengths?
Tilikum already weighed 5.6 tons at a length of 6.8m.
Scaled up isometrically that would result in a 13t animal at 9m.
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Post by Infinity Blade on Jul 27, 2019 15:54:20 GMT 5
I could have sworn reading a while back on Carnivora that orcas do get more gracile as they get longer. I think there was actual data on it too(?). I dunno, I'll have to do some digging to find it, though. It must have been on one of the "orca vs" threads.
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Post by elosha11 on Jul 27, 2019 15:55:16 GMT 5
Spartan, the heaviest wild orca was reportedly weighed at 10 tons, at around 10 meters. Which is enormous both in absolute terms and in terms of robusticity. I would imagine a 9 meter wild orca might be ranging 7-8 tons, which would still be an extremely large individual. And the few wild orcas that have been weighed have never come close to 13 tons, even 10 tons was an outlier.
So Tilikum was a very large orca at his length, but he was a captive animal. (Not sure what subspecies he was, some males orcas only reach 6-7 meters max length; others subspecies more commonly reach 8-9 meters max length) Much like lions and tigers in zoos, I wouldn't be surprised if captive orcas can reach weights rarely attained in the wild. They have a steady and easy food supply and relatively little exercise/movement (compared to wild orcas) to burn off calories. So basically Tilikum might have been obese, compared to his wild counterparts.
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Post by theropod on Jul 27, 2019 16:33:49 GMT 5
Was the 9.8 m orca ever even weighed? Unfortunately I seem to have misplaced the paper that contained this figure, but I think I saw it once and can’t recall it containing any weight figures. Heyning & Dalheim 1988 list 9.8 m as maximum recorded length, but maximum recorded weight is listed as 4 t in a 6 m bull orca, which suggests larger specimens simply hadn’t been weighed.
Heyning, J.E. and Dahlheim, M.E. 1988. Orcinus orca. Mammalian Species (304): 1–9.
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Post by spartan on Jul 27, 2019 16:54:14 GMT 5
That‘s what I remembered, too. 9.8m was the largest recorded length and 10t was the largest recorded weight, bur as far as I know these measurements weren‘t obtained from the same individual.
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Post by elosha11 on Jul 27, 2019 17:04:42 GMT 5
I think the 9.8 meter male orca was the also one estimated at 10 tons. I don't think it was actually put on scale, but calculated using water displacement. Can't remember the source but I read that somewhere...
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Post by theropod on Jul 27, 2019 17:16:19 GMT 5
Water displacement? How did they do that? Did they have a huge pool on their ship to put it in, and why would they do that rather than weigh it?
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Post by elosha11 on Jul 27, 2019 17:44:56 GMT 5
Maybe I'm not remembering it correctly. I'd have to try to find what I read again, it was a long time ago.
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Post by elosha11 on Jul 27, 2019 18:12:09 GMT 5
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