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aGentlemanScientist — Direct Evidence of Integument in mostly Theropoda
#integument #dinosaur #dinosaurs #feathers #scales #theropods #ornithischia
Published: 2016-03-15 04:41:20 +0000 UTC; Views: 5391; Favourites: 105; Downloads: 17
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Description
Numerous direct evidences of the skin coverings of various Theropods and one Ornithischian.A chart used in my most recent video concerning tyrannosaur integument: www.youtube.com/watch?v=uM5JN_…
Silhouettes created by Paleop and Tomozaurus , colored by me.
All sources can be found here:
z13.invisionfree.com/Hell_Cree…
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Comments: 49
In your FACE! www.youtube.com/watch?v=fqzxCz…
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YEAH!!!12 '12121212
TREI IS A FETHERNZAZI!!!
HE SAIS DINOZORS AD FEATHERS!!
ONKLY SOM HAD AND THE ONES THAT HAD WHERE ONL 2 O 3 FUTHURSS!!!
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JP is not a reliable source, it is just a Hollywood movie.
besides, even in Jurassic World, they admit that the dinosaurs are not accurate.
Henry Wu says this: "Nnothing in Jurassic World is natural, we have always filled the genome with the DNA of other animals, and if their genetic code was pure, many dinosaurs would look quite different, but you didn't ask for reality, you asked for more teeth!
basically implying that if they had got 100% of the DNA, then the dinosaurs, including t-rex would have feathers.
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Larson (2008) contains a short description of the skin patches found with Wyrex, associating them with the ventral side of the tail. Based on the figure he provided, at least some of those were had scales too.
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I know, I illustrated them in the image but they might not be visible in this chart; another chart illustrating only tyrannosaurus has them more visible.
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Ah, I see. Thanks, and keep up the good work!
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No problem and thank you
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I like the idea of dinosaurs having feathers because it explains how some of them can survive sub-freezing temperatures and not you know die
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It also has a big thing to do with them being lukewarm blooded
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Oh yeah i forget about there blood. Man the dinosaurs are awesome.
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Sure are m8, they are unlike anything alive today
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Do you think you would ever sell t-shirts on redubble or a website like that? I'd be first in line!
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Maybe in the future
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I think a better question to ask is "how come ornithischians lost their feathers?"
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We don't currently know if the structures on some ornithischians are homologous to feathers. If they are then the structures found on some early ornithischians are more display like and not very good at insulating, as a result maybe some creatures lost them as they did not need the display structures
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Are we sure they are just display? They look more like the type one and two protofeathers found on coelurosaurs and those I know are used for insulation.
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The ones seen on Tianyulong and Psittacosaurus (mostly Psittacosaurus) don't seem like they would be that effective at insulating. Two of the three types of integument on Kulindadromeus seem to look like type one and type three proto-feathers although since Tianyulong split off from the rest of the ornithischians before Kulindadromeus it can be assumed that that it is just analogous
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Keep in mind that the Tianyulong feathers only preserved the back and we have no other feather or skin impressions. Absence of evidence doesn't always indicate absolute absence. On the psittacosaurs though we do have scaly impressions along other parts of the body. Also keep in mind how distantly related psittacosaurs are related to the likes of Kulindadromeus and Tianyulong, so perhaps by the early Cretaceous ornithischian baldness was beginning.
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Seeing as we only have around 4 non-coelurosaurian with evidence of integument it's really hard to theorize, my guess is that if the integument is homologous then since earlier forms of proto-feathers were not as good at radiating heat maybe larger ornithischians and sauropods lost it while theropods just evolved to have feathers that could radiate heat better therefore explaining why if the integument does turn out to be homologous, how come many non-coelurosaurian dinosaurs don't have integument
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From what I also know, ornithischians don't seem to have air sacs like saurischians. Both groups have pneumatized bones, but it seems only the air sacs are present in saurischians. Perhaps this different style of respiration also played a hand in potential ornithischian baldness.
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Possibly, and size would explain sauropods baldness
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I believe they found scale skin impression on embryonic sauropods
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Flagged as Spam
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everywhere between embryonic, unborn sauropods too adults
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Flagged as Spam
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Obviously. Sheer size and probably either underdeveloped or nonexistent air sacs would play a role in bald sauropods. Imagine if the babies came out fuzzy like an elephant calf only for the fuzz to get finer and finer until it's practically invisible from a distance xD
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Sauropods were filled with airsacks. That's the main reason they grew so large, because of the weight they were saving through them.
But you probably meant the "secondary lungs" airsacks, right?
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Yup. Only theropods seemed to have air sacs connected to the lungs.
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Well, dinosaur scales are really only a hardened version of the bud that grows feathers. Perhaps it's a form of protection?
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I am also wondering how they'd regulate body temperature in Hell Creek. The local theropods are feathered for the cold,dry season, but the ornithischians are practically naked. Maybe the lack of air sacs and constant fermentation of plant matter kept ornithischians warm.
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I always thought the hadrosaurs and such migrated south for the cold season. Some may have even grown intugement out of the scales.
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That I could see also except for feathers growing out of scales. It'd be more like feathers growing between feathers as far as I know.
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Crap I meant feathers between scales.
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antediluviansalad.blogspot.com…
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From what I understand reading this, scales on a dinosaur worked much like the scales in crocodylians. They can be used to absorb heat by flushing blood through them or retract heat by pulling blood away. This combined with dinosaurs' inherent endothermic metabolism means they can stay warm in winter. Then another question I wonder, why did many theropods and basal ornithischians swap out scales for feathers?
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Feathers and ornithischian fuzz were probably better at it than scales were. You can trap more air with feathers and ornith fuzz than inside the skin itself. Also, filamentous integument can do this .
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So they also offer thermal radiation utility on either temperature extreme? Speaking of integument, do you think spinosaurs were had a thick layer of stage one or two protofeathers or had thermoregulating scales? I could see either one being possible since many semi-aquatic birds have feathers that are oily and water resistant, but on the other hand there are semi-aquatic reptiles. I personally lean more on scales being predominant though due to phylogenetics.
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"So they also offer thermal radiation utility on either temperature extreme?"
Based on the full paper, it does.
"Speaking of integument, do you think spinosaurs were had a thick layer of stage one or two protofeathers or had thermoregulating scales? I could see either one being possible since many semi-aquatic birds have feathers that are oily and water resistant, but on the other hand there are semi-aquatic reptiles. I personally lean more on scales being predominant though due to phylogenetics."
I wouldn't put anything on spinosaurs aide from scales and quills. I fully agree with your last sentence.
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I think that the skin in t-rexe's chest might be damaged tissue
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Whoo! More useless, childhood ruining facts! Okay seriously, who's sabotaging my script...?
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