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Dimetrodon by Vitor-Silva Dimetrodon by Vitor-Silva
In 2012, a study about a specimen of Dimetrodon giganhomogenes suggested, among other interesting conclusions, that the animal didn't had a complete sail, but that the tip of its spines lacked the so characteristic membrane. This was because the tips of some spines were very twisted (due fractures that healed after some time), and they wouldn't deform in such way if there was a membrane sustaining them.

In this illustration, I depicted some twisted spines, but still a complete sail. The explanation for this is the case of the same incident that fractured the spines have also ripped off the membrane around them, precluding the skin to sustain the injured bones (thus allowing the deformation).

More in: vitorsilvapaleoartista.blogspo…
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:iconcjcroen:
CJCroen Featured By Owner Dec 28, 2018  Hobbyist Traditional Artist
Battle scars.
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:iconovermind666:
Overmind666 Featured By Owner Aug 26, 2017  Student Artist
With an injury like that, it's built in radiator won' be as efficient as it used to.
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:icondrivernjax:
drivernjax Featured By Owner Nov 6, 2016
Looks like he's been in a fight or two.
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:iconjayzskippedlegday:
JayZSkippedLegDay Featured By Owner Feb 16, 2016  Student Digital Artist
ouch
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:iconacrocanthosaurusa:
AcrocanthosaurusA Featured By Owner Jan 9, 2016
I doubt it would sustain such an injury in the Permian.
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:iconvitor-silva:
Vitor-Silva Featured By Owner Jan 9, 2016  Professional
Would it be able to sustain the injury only in the Triassic? - just kidding xP
Actually, we in fact know that the animal survived the wounds because the bones have signs of healing.
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:iconacrocanthosaurusa:
AcrocanthosaurusA Featured By Owner Jan 9, 2016
Quite resilient and in the Triassic it'd be just as bad.
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:iconasuma17:
Asuma17 Featured By Owner Nov 3, 2015  Hobbyist General Artist
Now this looks more better and reasonable...Vitor my pal you got the depiction right to the brink. This looks a loads better than the way people we're depicting it originally....I really think those paleontologists could've explained the detail of the membrane in the Dimet's sail instead making it seem that the sail was actually just a large hump with long spines coming out of it like a lightning rod.
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:iconvitor-silva:
Vitor-Silva Featured By Owner Nov 3, 2015  Professional
Thank you ! I'm also very skeptical for the "new look",  this explanation is more reasonable to me, too.
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:iconpterosaur-freak:
Pterosaur-Freak Featured By Owner Oct 5, 2015
Fascinating! An interesting take on those deformed spines. Kind of reminds me of Bettas, in a way- giant display structures that are constantly in tatters. I should really do more Pelycosaur art, explore all the possibilities of the sail extent.
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:iconvitor-silva:
Vitor-Silva Featured By Owner Oct 5, 2015  Professional
Many thanks! ^^
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:iconteratophoneus:
Teratophoneus Featured By Owner Sep 24, 2015
I wonder how it would sustain such an injury
Awesome pic by the way :)
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:iconvitor-silva:
Vitor-Silva Featured By Owner Sep 24, 2015  Professional
Yeah, this looks painful...
Thank you! ^^
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:iconelperdido1965:
Elperdido1965 Featured By Owner Sep 18, 2015  Hobbyist Digital Artist
Great !!!
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:iconvitor-silva:
Vitor-Silva Featured By Owner Sep 18, 2015  Professional
Thank you!
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:icontraheripteryx:
Traheripteryx Featured By Owner Sep 12, 2015  Hobbyist General Artist
Awesome! :D
One of the coolest Dimetrodons, I've seen so far!
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:iconvitor-silva:
Vitor-Silva Featured By Owner Sep 13, 2015  Professional
Thank you so much! :thanks:
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:iconrickraptor105:
RickRaptor105 Featured By Owner Sep 11, 2015
Thank you, this comes in quite handy.

I was JUST about to colour a Dimetrodon based on the "half-sail" look. Guess now I can correct the sail to the classic look again.
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:iconvitor-silva:
Vitor-Silva Featured By Owner Sep 13, 2015  Professional
No problem, but the half sail is still a possibility, if you consider it plausible. I prefer the ripped membrane theory of this illustration, but it is personal view.
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:iconasari13:
asari13 Featured By Owner Sep 11, 2015  Hobbyist Traditional Artist
awesome
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:iconvitor-silva:
Vitor-Silva Featured By Owner Sep 11, 2015  Professional
Thank you!
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:icontarbosaurusbatar:
TarbosaurusBatar Featured By Owner Sep 10, 2015  Hobbyist General Artist
Interesting interpretation. Is there more evidence for this than the alternate idea? 
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:iconvitor-silva:
Vitor-Silva Featured By Owner Sep 11, 2015  Professional
Thanks! Well, the only evidences we have are the fractured spines themselves. Both ideas justify how the injured spines could bend so much, but I, personally, still am not convinced with the half sail appearance.
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:icontarbosaurusbatar:
TarbosaurusBatar Featured By Owner Sep 11, 2015  Hobbyist General Artist
Ok. 
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:icondontknowwhattodraw94:
Dontknowwhattodraw94 Featured By Owner Sep 10, 2015  Hobbyist Traditional Artist
Interesting take on that new study :)
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:iconvitor-silva:
Vitor-Silva Featured By Owner Sep 10, 2015  Professional
Thank you! :thanks:
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:icondontknowwhattodraw94:
Dontknowwhattodraw94 Featured By Owner Sep 10, 2015  Hobbyist Traditional Artist
You're welcome :)
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:iconzimices:
Zimices Featured By Owner Sep 9, 2015  Hobbyist
Good work! Is interesting still how the damage affected the life of the animal - maybe the regrowth of the bone and skin were too expensive for this specimen in particular?
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:iconvitor-silva:
Vitor-Silva Featured By Owner Sep 10, 2015  Professional
Thanks, man! Probably, but given the delicacy of the spines, if these animalswere fighting with some frequency, twisted spines may have been pretty common among them.
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:icontheamazingkopout:
TheAmazingKopout Featured By Owner Sep 9, 2015
This guy has had a bad day.
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:iconpcawesomeness:
PCAwesomeness Featured By Owner Edited Sep 9, 2015
Eek! Zombies!

JK. Looks nice!
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:iconvitor-silva:
Vitor-Silva Featured By Owner Sep 10, 2015  Professional
Haha, thank you :)
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:iconpcawesomeness:
PCAwesomeness Featured By Owner Sep 10, 2015
You're welcome.
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:iconwesdaaman:
Wesdaaman Featured By Owner Sep 9, 2015  Student General Artist
It must have been from a fight
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:iconvitor-silva:
Vitor-Silva Featured By Owner Sep 10, 2015  Professional
That's my main guess :nod:
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:iconiguana-teteia:
Iguana-Teteia Featured By Owner Sep 9, 2015
Não entendi Vitor...Aquilo foi só especulação então?
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:iconvitor-silva:
Vitor-Silva Featured By Owner Sep 10, 2015  Professional
+ ou -, na vdd acho q a versão mais especulativa é a do meu desenho rs. Nesse estudo de 2012, os autores realmente concluíram que a membrana não chegaria até a extremidade dos espinhos neurais. O motivo seriam alguns espinhos q estavam muito curvados nas pontas, pois eles não poderiam ficar assim se estivessem sendo segurados por uma membrana. Eu achei estranho, não estava 100% convencido, aí me veio essa hipótese: sabemos q os espinhos ficaram deformados por causa de lesões que já haviam se curado, então, e se o mesmo ferimento que os fraturou tivesse também rasgado a membrana em volta deles? Aí ela não teria como os segurar, e não impediria essa deformação que os curvou tanto.

Me pareceu plausível, e explicaria as deformações sem necessariamente mudar o visual da vela.
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:iconiguana-teteia:
Iguana-Teteia Featured By Owner Sep 15, 2015
Ah então era tudo especulação? Vish fui precipitada...rs
Por exemplo, até hoje tenho minhas dúvidas em relação ao Spinosaurus. É errado retratá-lo como mais bípede e um leque dorsal mais arredondado? E o Dimetrodon? Ele ainda pode ser desenhado como um "lagartão"?
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:iconvitor-silva:
Vitor-Silva Featured By Owner Sep 15, 2015  Professional
Sim, nada 100% certo, ainda. Acho q nem foi precipitação, porque a vela incompleta é uma possibilidade, pois não deixa de explicar como os espinhos machucados puderam se curvar. Mas, pelo menos por enquanto, acho mais provável o ferimento ter simplesmente rasgado a membrana, mesmo. 

Fazer ele muito reptiliano não é uma boa, porque sinapsídeos não são e nem descendem dos répteis, então é mais indicado fazer a pele mais como um couro, lembrando um mamífero.

Com o Spinosaurus tbm tem quem discorde das pernas, e a maioria discorda dele quadrúpede (mesmo com as pernas curtas), então acho q tem uma liberdade em desenhar ele, ainda. Pro formato da vela, os autores do novo estudo não justificaram o formato "ondulado", então quem defendia o formato anterior, dela estendida até a cauda e arredondada, continua o defendendo (aqui explicam o formato anterior: www.skeletaldrawing.com/home/2…). Então, dependendo de pra quem se pergunte, a imagem dele antes dessa nova continua a mais correta.
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:iconiguana-teteia:
Iguana-Teteia Featured By Owner Sep 15, 2015
Uau! Não fazia ideia de que a anatomia "antiga" do Spinosaurus fosse a mais correta, ainda.
Embora eu tenha sido uma das poucas pessoas que curtiu mais a anatomia quadrúpede dele...rs
Mas é como eu sempre digo, só vamos ter 100% de certeza de como os dinossauros realmente eram, quando criarem uma máquina do tempo. Já o Dimetrodon, concordo com vc. Ele era um bicho único, meio mamífero, meio réptil/lagarto...eu acho que ele devia ter uma pele meio de elefante, com talvez algumas cerdas, semelhantes a pêlos. Mas pêlo mesmo acho que ele não chegava a ter.
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:iconvitor-silva:
Vitor-Silva Featured By Owner Sep 16, 2015  Professional
Bom, se a antiga é mais correta, depende realmente de pra quem se pergunta rsrs. Mas tbm curti a aparência nova, ñ vou achar ruim se acabar sendo a verdadeira.
Pele de elefante é mesmo uma ótima referência pra esses bichos, e fica legal porque é bem detalhada, cheia de rugas e dobras.
E isso é verdade, sem dar pra ver os animais ao vivo, sempre vai ter especulação de um jeito ou de outro.
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:iconiguana-teteia:
Iguana-Teteia Featured By Owner Sep 16, 2015
Pois é. O que tem que rolar na verdade é o respeito entre os paleoartistas. Tem uns que metem bala em você se você não fez um determinado dinossauro com penas por exemplo. rs
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:iconhyrotrioskjan:
Hyrotrioskjan Featured By Owner Sep 9, 2015  Professional General Artist
Interesting interpretation :thumbsup: 
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:iconvitor-silva:
Vitor-Silva Featured By Owner Sep 10, 2015  Professional
Thank you, Joschua! :)
I wasn't fully convinced of the half sail look for some reasons, and this possibility came to my mind.
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:iconanonymousllama428:
AnonymousLlama428 Featured By Owner Sep 9, 2015  Hobbyist General Artist
Great work, man! Very realistic!
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:iconvitor-silva:
Vitor-Silva Featured By Owner Sep 10, 2015  Professional
Many thanks!
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:iconblazze92:
bLAZZE92 Featured By Owner Sep 9, 2015
That is the same study that caused a lot of people to jump in the sail-less Dimetrodon bandwagon some months ago, no? they didn't bother to actually read the paper.
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:iconvitor-silva:
Vitor-Silva Featured By Owner Sep 10, 2015  Professional
It is the same, but the authors indeed pointed the incomplete sail appearance. Here, I tried another explanation for the the spines deformation, without necessarily changing the whole sail distribuition.
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:iconblazze92:
bLAZZE92 Featured By Owner Sep 10, 2015
I like what you did, the authors did mention the incomplete sail but made clear it was pathological so what others went with didn't make sense, yours on the other hand is true to the fossil and the study.
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:iconvitor-silva:
Vitor-Silva Featured By Owner Sep 11, 2015  Professional
Well, thank you, then :)
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