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Post by foxilized on Sept 20, 2009 4:48:09 GMT
Who was the first one who proposed sauropods could rise on two legs? I mean before JP made that popular. Was that an old theory?
And today, is that still accepted as posible?
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Post by Dan on Sept 20, 2009 7:07:28 GMT
I do not believe Jurassic Park made bipedal postures of sauropods "popular". Charles Knight depicted a bipedal sauropod in the water in 1897, when popular theory held that sauropods needed to spend most of their time in water to support their weight.
Tripodal postures are regularly debated among paleontologists, regarding many species of dinosaurs. In the case of sauropods, I believe recent evidence suggested that using the tail as a third support-leg would have cracked bones. Even if the idea continues to be supported today, most would agree that such sauropods probably couldn't sustain such a posture for extended periods.
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Post by john2xtheman on Sept 20, 2009 7:15:30 GMT
Here's the latest on this subject:
"Since early in the history of their study, scientists such as Osborn have speculated that sauropods could rear up on their hind legs, using the tail as the third 'leg' of a tripod. A skeletal mount depicting the diplodocid Barosaurus lentus rearing up on its hind legs at the American Museum of Natural History is one illustration of this hypothesis. In a 2005 paper, Rothschild and Molnar reasoned that if sauropods had adopted a bipedal posture at times, there would be evidence of stress fractures in the forelimb 'hands'. However, none were found after they examined a large number of sauropod skeletons.
Heinrich Mallison (in 2009) was the first to study the physical potential for various sauropods to rear into a tripodal stance. Mallison found that some characters previously linked to rearing adaptations were actually unrelated (such as the wide-set hip bones of titanosaurs) or would actually have hindered rearing. For example, titanosaurs had an unusually flexible backbone, which would have decreased stability in a tripodal posture and would have put more strain on the muscles. Likewise, it is unlikely that brachiosaurids could rear up onto the hind legs, given their center of gravity was much farther forward than other sauropods, which would cause such a stance to be unstable.
Diplodocids, on the other hand, appear to have been well adapted for rearing up into a tripodal stance. Diplodocids had a center of mass directly over the hips, giving them greater balance on two legs. Diplodocids also had the most mobile necks of sauropods, a well-muscled pelvic girdle, and tail vertebrae with a specialised shape that would allow the tail to bear weight at the point it contacted the ground. Mallison concluded that diplodocids were better adapted to rearing than elephants, which do so occasionally in the wild. He also argues that stress fractures in the wild do not occur from everyday behaviour, such as feeding-related activities (contra Rothschild and Molnar)"
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Post by foxilized on Sept 20, 2009 7:57:12 GMT
Very interesting.
Yeah, Knight painted a Diplo in two legs, not even in the water but in the land. And yes, it's a 19th century painting. Amazing.
Still, looks like the concept wasn't very used in the first part of the 20th century, right? I mean, never saw a bipedal pose sauropod in any paleoart till... the 70's maybe?
I know the bipedal pose was very popular in the 90's (really don't know if because of JP or because the Barosaurus of the museum in New York...), but was it also popular before?
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Post by Griffin on Sept 20, 2009 15:09:00 GMT
I think its funny how JP did it with one of the few sauropods, brachio, that most likely could not physically pull that off.
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Post by fleshanthos on Sept 20, 2009 19:53:20 GMT
Tell me about it. There I was, all goosebumps and tears welling up at finally seeing them portrayed correctly, (with a hot chick I was trying to score with next to me) and then they go and blow it with the rearing Brach.
...oh well...
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Post by Griffin on Sept 21, 2009 0:22:06 GMT
Tell me about it. There I was, all goosebumps and tears welling up at finally seeing them portrayed correctly, (with a hot chick I was trying to score with next to me) and then they go and blow it with the rearing Brach. ...oh well... So...are you saying that because brachio reared up...you didn't get with the girl you were with?
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Post by foxilized on Sept 21, 2009 1:40:35 GMT
... and that you were triying to seduce the chick crying watching dinosaurs?
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Post by sarcasmosaur on Sept 22, 2009 0:20:47 GMT
Hey I am pretty hot for dudes who cry at dinosaurs
There there, little dude, just put your head on my shoulder and the pronated hands will go away.
Uh....sorry, just lapsed into creepy fantasy zone for a second there.
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Post by [][][]cordylus[][][] on Sept 22, 2009 0:23:43 GMT
^^ I keep forgetting that you are a girl
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Post by Griffin on Sept 22, 2009 0:26:50 GMT
The little pink circle with a cross, kinda looks like a mirror, symbol for Venus...did I mention its pink? Well yeah its there.
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Post by sarcasmosaur on Sept 22, 2009 0:34:34 GMT
Pffff. I want to color mine green, or possibly orange or red, because pink is so not my color.
Oh wait this thread is about sauropods isn't it
Uh
Why aren't there any Dicraeosaurus toys, do I need to sculpt my own or what?
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Post by foxilized on Sept 22, 2009 1:10:25 GMT
Actually it's about sauropods Rising Up, you know. But I guess we can allways turn to "what makes a paleofreakchick get hot" topic, without mayor problems. We can allways join the topic "what makes a sauropod Rise Up" too, or something. d**n, I DO need to get out more.
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Post by [][][]cordylus[][][] on Sept 22, 2009 1:11:59 GMT
The little pink circle with a cross, kinda looks like a mirror, symbol for Venus...did I mention its pink? Well yeah its there. And the word "female" is there too, I'm not blind.
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Post by Radman on Sept 22, 2009 1:30:46 GMT
Pffff. I want to color mine green, or possibly orange or red, because pink is so not my color. Oh wait this thread is about sauropods isn't it Uh Why aren't there any Dicraeosaurus toys, do I need to sculpt my own or what? Here is a nice Dicraeosaurus, by Salas: Of course. it needs painting...
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Post by sarcasmosaur on Sept 22, 2009 3:43:38 GMT
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Post by sbell on Sept 22, 2009 3:45:29 GMT
Pffff. I want to color mine green, or possibly orange or red, because pink is so not my color. Oh wait this thread is about sauropods isn't it Uh Why aren't there any Dicraeosaurus toys, do I need to sculpt my own or what? Here is a nice Dicraeosaurus, by Salas: Of course. it needs painting... Starlux made one as well--it is not very good, but it is very uncommon, and can be quite $$$.
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Post by Horridus on Sept 22, 2009 11:36:39 GMT
There there, little dude, just put your head on my shoulder and the pronated hands will go away. And the backward-curved serrated teeth, double crests, exceedingly robust morphology etc etc? And that's just one species! Aaarrggh!
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Post by fleshanthos on Sept 22, 2009 16:53:38 GMT
NO! They blew the cool moment (in which I was also at the same time trying to score) of cinematic 'first time ever' with a screw up.
Ultimately not scoring with the chick was besides the point.
They clearly decided to ignore their paleontological consultant on that one, along with a bunch of other stuff, for the expediency of Hollywood enturtainmunt.
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Post by Horridus on Sept 22, 2009 16:55:23 GMT
I bet it was Jack Horner's doing. That wacky prankster. EDIT: Well, your edit to the previous post has somewhat spoiled this one. Thanks very much.
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