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| Extinct Animal Questions | |
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| Topic Started: Nov 26 2013, 10:24 PM (193,456 Views) | |
| caviar | Sep 12 2014, 07:09 AM Post #571 |
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Do we already know the updated paper about utahraptor? |
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| Bill | Sep 12 2014, 07:54 AM Post #572 |
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originally, one_piece
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how likely is it for an arsinoitherium to REALLY have a trunk? |
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| Rudyn | Sep 16 2014, 12:29 PM Post #573 |
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Some bird species choose pair for a life. Are there any chance that some Theropods species and Pterosaurses species also choose pair for a life ? |
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| Swimming Spaghetti Monster | Sep 16 2014, 01:31 PM Post #574 |
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Is there a possibility that Siamosaurus, or any spinosauriid (including yet undiscovered ones) was fully or almost fully aquatic? |
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Sep 16 2014, 04:27 PM Post #575 |
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Its highly unlikely for any Archosaur or Testudine to ever evolve to become fully aquatic because they have hard shelled eggs which the embryos obtain calcium from. I believe the same is also true for Sphenodonts but I'm not sure. At the most you'd see something akin to a sea turtle. There are ways around this but as far as I know none are practical or efficient under most circumstances. |
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| CyborgIguana | Sep 16 2014, 05:02 PM Post #576 |
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Well obviously there's no way for us to rule out the possibility, but AFAIK there's no current evidence for this if that's what you mean. |
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Sep 16 2014, 05:32 PM Post #577 |
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Fairly likely. It's the ancestor of elephants, so, it probably didn't have a long trunk that you might think of when you hear the word elephant, but it probably did have some sort of small, stubby if you will, trunk for grazing. |
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| Furka | Sep 16 2014, 05:34 PM Post #578 |
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Ancestor is a big word, I'd say more of a relative. |
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Sep 16 2014, 05:43 PM Post #579 |
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Well I never said that elephants were directly descended from arsinotherium, I just meant they were related closer to elephants than what you would think it actually is, like a rhino. |
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| stargatedalek | Sep 16 2014, 06:35 PM Post #580 |
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I'm not slow! That's just my moe!
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I'd consider it fairly likely for theropods, its true for the majority of birds species |
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| Yi Qi | Sep 16 2014, 06:48 PM Post #581 |
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True, but i could see it happening still, maybe if an archosaur developed a cloacal pouch, a "marsupium" for lack of a better term and housed its eggs inside it till they hatched while still in the water? Technically they'd be laid, but they would be incubated inside the mothers pouch while she swims.Its not that far fetched, emperor penguins have a similar structure to protect their eggs from the antartic winter, and i could easily see that adapted to something like i described, wouldn't be much of a stretch would it? Still, just toughts... |
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| Justice Society of America | Sep 16 2014, 06:51 PM Post #582 |
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Local Turd
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Spinosaurus aegyptiacus is already thought to be pretty aquatic . . . and it's apparently the least aquatic spinosaur.
IMO it's not likely. Trunks leave obvious evidence on the skull (see: any trunked animal ever), which Arsinoitherium doesn't have. As far as I can tell, it is more likely that humans have trunks than Arsinoitherium because we don't have a split nose. If it did have a trunk, it would probably be a very short double trunk like that of a tube nosed bat. Edited by Justice Society of America, Sep 16 2014, 07:42 PM.
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| CyborgIguana | Sep 16 2014, 07:33 PM Post #583 |
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True, I never said it was unlikely, just that it's the kind of behaviour that couldn't be deduced using the fossil record alone. |
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Sep 16 2014, 08:55 PM Post #584 |
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I don't think this is a very practical scenario or we would see it used by modern animals. Keeping water out of the egg is one thing, but getting oxygen into it is another, if its trapped in a pouch it's going to slowly run out of oxygen. Obviously you could have some tubes that bring air to the egg but that's not really practical and would probably be more trouble to evolve than its worth. |
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| Yi Qi | Sep 16 2014, 11:07 PM Post #585 |
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I see, i forgot to put the oxygen thing inside the equation, stupid me
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