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PLASTOSPLEEN — Tyrannosaurus rex
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Published: 2015-10-20 06:38:50 +0000 UTC; Views: 1078; Favourites: 43; Downloads: 0
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Description
(tie-ran-no-sore-us)T. rex was the top predator of Cretaceous America. Using it's massive head to decapitate prey, it was an extremely effective predator. The males are smaller, and during the breeding season the whole head and neck skin becomes bright red.
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Comments: 16
You always make the most accurate & realistic depictions !
Fave'd ! Bravo ! Awesome work !
It's very sad that nobody knows real tyrannosaurus'es don't had a mouth structure like crocodiles (ie. No teeth showing)
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Was wondering: is it still okay to draw your saurs with their teeth exposed? I always thought they had thin, useless lips, like birds.
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I suppose there isn't really a problem with it but there's no modern animal that has the half-way lip you're talking about. It's more parsimonious cover the teeth with oral tissue and less parsimonious to have them exposed (for everything but spinosaurids, at least) but its least parsimonious to depict them with half-covered teeth.
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So, what should I do? I don't get what you mean by Parismonious.
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Straight from the dictionary, Occam's Razor or the Rule of Parsimony
"the principle in philosophy and science that assumptions introduced to explain a thing must not be multiplied beyond necessity, and hence the simplest of several hypothesesis always the best in accounting for unexplained facts."
Full lips are most parsimonious, no lips is less so, and half-lips are least. (More parsimonious being more likely and half lips being least likely according to the rule)
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Why did you give him lips? I think its obvious that it is more terrifying with its teeth rxposed like a crocodiles (upper teeth).
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There's no reason to think that T.rex would be lipless. The ancestral trait for tetrapods is to have teeth covered in some sort of tissue and so far as we know there would be no reason for Tyrannosaurus to lose that tissue. Crocodiles lost it so that the teeth would be unobstructed by lips allowing fish to be impaled more easily. Its likely that spinosaurids did the same for at least part of the mouth. Tyrannosauroids and most predatory dinosaurs in general would have no problem biting prey with lips as lizards do it perfectly well; all odds are most dinosaurs were lizard-lipped or something along those lines.
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But dinosaurs are more closely related to birds and crocodiles. It only makes sense if small theropods had lips. Sure, Tyrannosaurus may have lips, but it would be too small to cover the upper teeth. The T-Rex lips make me wanna think more like a mammal, but I am quite sure that Tyrannosaurus is not a mammal. Also, the idea of T-Rex lips reminds me of the outdated, tail-dragging, kangaroo-pose that the 1950's used to depict on it.
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Birds don't have lips because they have beaks and crocodiles don't because a conical toothed piscivore benefits from losing them. Most birds do have some small remnant of lip-like tissue at the posterior edges of the mouth. Why would small theropods have them but large ones not? I've heard the argument that lips couldn't cover the teeth but I don't agree with it; the length of the teeth as seen in fossils isn't representative of what was visible on the animal in life. Theropod teeth tend to slip from the socket slightly during decomposition so that makes them appear longer than they would actually be when alive. In addition, the gums would cover a fair portion of the tooth as well. Long-toothed lizards such as Gila monsters have teeth totally covered by lips even though it seems like they would stab themselves by shutting the mouth.
www.nature-watch.com/images/pr…
mojavepreserve.org/uploads/ima…
T.rex's upper teeth don't pass the lower boundaries of the jaw either, so there's no reason the teeth would protrude.
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