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Post by DinoLord on Jul 10, 2011 14:49:20 GMT
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Post by Horridus on Jul 10, 2011 18:27:40 GMT
Taxonomy, man...my head hurts.
And yeah, they could be, apparently - Matt's not the only person I've heard this from. Whether or not the name 'Thespesius' will ever be adopted again is open to question, though...
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Post by arioch on Jul 10, 2011 18:59:02 GMT
How come we didnt hear before about some of this features (the big dewlap, tail extension, nasal pouch..) ? seems like some of this specimens have been around for some time. Not that I question the source, and it is indeed very interesting. Also makes sense, why would duckbills need such a muscular tails if they couldn´t use them for defense?
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Post by Horridus on Jul 10, 2011 19:05:35 GMT
Also makes sense, why would duckbills need such a muscular tails if they couldn´t use them for defense? The answer is for running - unlike in mammals, nonavian dinosaurs would have had large muscles connecting the tail and legs that were used in locomotion, known as the caudofemoralis muscles. |
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Post by arioch on Jul 10, 2011 19:14:23 GMT
But quadrupedal ornithopods would really need it for the balance? or they are just meant to add power to the hind egs?
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Post by Horridus on Jul 10, 2011 20:14:48 GMT
But quadrupedal ornithopods would really need it for the balance? or they are just meant to add power to the hind egs? The second one. Power to the legs. All the better to take off away from a tyrannosaur. |
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Post by arioch on Jul 10, 2011 21:32:37 GMT
Still, those tails are a formidable weapon agains juvenile tyrannosaurs even without the whip like extension. Another proof that duckbills and another non armored big hervibores weren´t just giant sheeps unable to put up a fight...
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Post by Griffin on Jul 10, 2011 21:45:14 GMT
Still, those tails are a formidable weapon agains juvenile tyrannosaurs even without the whip like extension. Another proof that duckbills and another non armored big hervibores weren´t just giant sheeps unable to put up a fight... I don't think anyone's ever argued against that. They probably were only really on the menu for adult tyrannosaurs. Anything less would have been squished. |
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Post by Horridus on Jul 10, 2011 21:47:24 GMT
I don't think anyone's ever argued against that. They probably were only really on the menu for adult tyrannosaurs. Anything less would have been squished. There's a skeletal mount somewhere of a full-grown Lambeosaurus lambei being attacked by some Saurornitholestes. If that really happened it would indeed be squish time. |
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Post by arioch on Jul 10, 2011 22:05:37 GMT
I don't think anyone's ever argued against that. Unless you mean anyone here, they´re still seen as big scaly lambs by most people and the general perception (even in the scientist community) is that they´d just squeal and run if one or two 50 kg theropod atempted to chase them, let a lone a young rex. Hopefully that perception will change in the years to come thanks to the efforts of popularizers or artists like L. Rey. |
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Post by stoneage on Jul 10, 2011 23:12:59 GMT
I don't think anyone's ever argued against that. Unless you mean anyone here, they´re still seen as big scaly lambs by most people and the general perception (even in the scientist community) is that they´d just squeal and run if one or two 50 kg theropod atempted to chase them, let a lone a young rex. Hopefully that perception will change in the years to come thanks to the efforts of popularizers or artists like L. Rey. I don't really think a couple of 110 pound theropods, would scare adult Hadrosaurs much! |
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Post by arioch on Jul 11, 2011 0:40:53 GMT
Neither do I, but we are a minority on this. I made a quick drawing to illustrate this new look on duckbills ( I reckon lambeosaurines might have shared that features)  Uploaded with ImageShack.us |
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Post by DinoLord on Jul 11, 2011 1:18:55 GMT
Looks like you have to fix it. The same guy who told me about this story told me of a lambeosaurine mummy that shows that the thighs were actually under the skin of the main body, rather than being a distinct clump of bone and muscle. Kind of like in this picture:  |
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Post by Blade-of-the-Moon on Jul 11, 2011 1:20:07 GMT
Unless you mean anyone here, they´re still seen as big scaly lambs by most people and the general perception (even in the scientist community) is that they´d just squeal and run if one or two 50 kg theropod atempted to chase them, let a lone a young rex. Hopefully that perception will change in the years to come thanks to the efforts of popularizers or artists like L. Rey. I don't really think a couple of 110 pound theropods, would scare adult Hadrosaurs much! I think if the hadrosaur in question were sick or injured to a point it could barely run away or fight back..maybe even one in the midst of egg laying or exhausted from it they might stand some chance..there is always a possibility if a slim one. |
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Post by arioch on Jul 11, 2011 1:49:06 GMT
Looks like you have to fix it. The same guy who told me about this story told me of a lambeosaurine mummy that shows that the thighs were actually under the skin of the main body, rather than being a distinct clump of bone and muscle. Kind of like in this picture: Interesting. And it lacked the dewlap too? |
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Post by DinoLord on Jul 11, 2011 2:03:52 GMT
I'm not sure actually. The illustration is more of something to demonstrate the thighs.
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Post by Griffin on Jul 11, 2011 3:57:45 GMT
I don't think anyone's ever argued against that. Unless you mean anyone here, they´re still seen as big scaly lambs by most people and the general perception (even in the scientist community) is that they´d just squeal and run if one or two 50 kg theropod atempted to chase them, let a lone a young rex. Hopefully that perception will change in the years to come thanks to the efforts of popularizers or artists like L. Rey. What are you talking about? I think you are just used to hearing about tyrannosaurus rex (a predator that actually could pulverize a hadrosaur relatively easily). I don't think most people on here think a hadrosaur is totally defenseless against other things (depending on the situation of course). Even so I say given the choice to fight or run, even if it did have weaponry, I say a hadrosaur would run if it sensed danger. Most animals with the ability to move quickly enough would do the same today. Why risk it? |
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Post by Seijun on Jul 11, 2011 4:51:44 GMT
This is all really neat info if true, even though it does completely destroy my image of hadrosaurs...
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Post by arioch on Jul 11, 2011 5:01:40 GMT
What are you talking about? I think you are just used to hearing about tyrannosaurus rex Hearing what about tyrannosaurus rex? I can´t see your point. And I´m not talking about the views of the people on here ( I guess you mean the forum), but the general perception of the paleontology fan community worldwide. So, relax, please. |
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bfler
Junior Member
Posts: 97
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Post by bfler on Jul 11, 2011 7:37:24 GMT
To the initial question:
Maybe not one species but some species could be the same. Fewer species means fewer rivals for food and a better chance for the plant population to fulfill the energy needs of the herbivores.
Furthermore, if I am right, many similar species with some visual differences,like in this case, are the result of isolation and therefore different visual mating signals and there is no sign that there was some kind of greater isolation in that area. So the result without isolation are fewer species.
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