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The Strange Reptile by bricksmashtv The Strange Reptile by bricksmashtv
Yes all major species of Allosaurus (I did not include lucasi because fuck lucasi XD. In all seriousness I just can't find the paper for it. And no I will not be including Epanterias or Saurophaganax in Allosaurus).

A. fragilis: this is the type species of Allosaurus. This species is much less common than atrox in the Morrison, having only five specimens that can be reliably confirmed to be fragilis (holotype YPM 1930, neotype USNM 4734 (illustrated here), and referred specimens AMNH 600, BYU 8028, & UUVP 40-724. This species is the typical "high & short" skull morph.

A. atrox: this is the most common species of Allosaurus, with most every individual from the Cleveland-Lloyd quarry encompassed by it. The most complete specimen (& the intended holotype) is DINO 2560 (formerly UUVP 6000), though it is lacking the pes & forelimbs. Other notable specimens include AMNH 666, AMNH 680 (the second largest Allosaurus specimen after NMMNH P-26083), BYU 571/8901, YPM 1944, & YPM 1890 (the holotype of Creosaurus atrox). This is the "low & long" skull morph. It's the geographically youngest Allosaurus species (barring Epanterias & Saurophaganax for now).

A. "jimmadseni": this species is still technically unnamed (none of the three most complete specimens have been described in great detail). This includes the extremely complete specimens Big Al & Big Al 2, as well as the intended holotype specimen DINO 11541. The skull of jimmadseni is intermediate between atrox & fragilis in morphology, which is interesting as "jimmadseni" is the geographically oldest Allosaurus species. rather short tailed compared to the other Allosaurus species. Has extremely reduced forelimbs compared to the others.

A. europaeus: this is the European species of Allosaurus (the one featured in Dinosaur Revolution). The skull is closer to fragilis or jimmadseni in morphology. There are several remains labelled Allosaurus sp from Portugal. I did not include them here due to lack of overlapping material. This is actually the largest Allosaurus species (again barring Epan & Sauro), at 9.7m.

DISCLAIMER: My Honor is called Loyalty, and my Art is Honorable – therefore I do not take credit for any other artist's skeletal or schematic references used as reference for this image. Nor do I claim them as my own.

This image is based on :iconscotthartman:'s
A. jimmadseni skeletal/schematic: [link] as well as :icongetawaytrike:'s Allosauridae skeletal/schematic: [link]
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:iconthedinorocker:
thedinorocker Featured By Owner 5 days ago
Hi, DINO 2560/UUVP 6000is illustated in both Hartman's and GAT skeletals, but they appear pretty different...
In Scott Hartman recostruction the skull is shorter and higher, most similar to the average A.fragilis, in GTA it s long and low.
This is pretty strange because this should be a noce specimen with a pretty complete skull. Furthemore other postcranial element apre pretty different (from the spinal morphology ti the pelvic region) so I suspect Someone based the skeletal on another specimen, am I right?
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:iconbricksmashtv:
bricksmashtv Featured By Owner 5 days ago  Hobbyist Traditional Artist
From what I can tell, in Madsen (1976), there is a skull that looks like the one Hartman used, but it's labelled "composite restoration" & not UUVP 6000/DINO 2560. From what I can tell assembling the individual skull fragments, GAT's skull is more accurate (& by definition, so are Bakker & GSP's). I have no idea how Hartman got what he got for the postcranial material though.
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:iconthedinorocker:
thedinorocker Featured By Owner 5 days ago
The Madsen composite drive the idea of Allosaurus fragilis cranial morphology for decades and a sculpt of That modello is Now mount in tos of museum.
The picture of the actual skull DINO 2560 I found show a long gracile skull with "A.atrox" morphology.
I probably should ask to Hartman himself, Thank you :)
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:iconbricksmashtv:
bricksmashtv Featured By Owner 5 days ago  Hobbyist Traditional Artist
you're welcome.
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:iconacepredator:
acepredator Featured By Owner Mar 4, 2017
Jesus this is a gigantic mess
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:iconbricksmashtv:
bricksmashtv Featured By Owner Mar 5, 2017  Hobbyist Traditional Artist
I agree xD
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:iconacepredator:
acepredator Featured By Owner Jan 29, 2017
How does Saurophaganax and "Epanterias" fit into this?

(IMHO Epanterias was adult A. atrox)
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:iconbricksmashtv:
bricksmashtv Featured By Owner Jan 30, 2017  Hobbyist Traditional Artist
Personally I like to retain them as separate genera, based on both the temporal separation (especially Epanterias, it's really young compared to other allosaurids) & the diagnostic characters (or rather lack of them in the case of Epanterias - it shares characters with both Allosaurus & Saurophaganax). It can go either way, but I personally wouldn't demote either of them lower than species level.
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:iconvasix:
vasix Featured By Owner Jan 3, 2017  Hobbyist Digital Artist
Let me get this straight now, ahem...would A.fragilis be, stratigraphy-wise, in between A.jimmadseni and A.atrox? This is some very complicated stuff for Allosaurus and also damn, A. europaeus is huge. 
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:iconbricksmashtv:
bricksmashtv Featured By Owner Jan 3, 2017  Hobbyist Traditional Artist
Yes, fragilis is somewhere in between them.

Yeah I was surprised how big europaeus was when I finished it too.
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:icondontknowwhattodraw94:
Dontknowwhattodraw94 Featured By Owner Jan 1, 2017  Hobbyist Traditional Artist
Didn't know A. atrox was a thing... (read in the comments it's considered A. fragilis so that explains)
Weird how the European one is the biggest. I always thought those were actually the smallest.
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:iconbricksmashtv:
bricksmashtv Featured By Owner Jan 1, 2017  Hobbyist Traditional Artist
atrox is often considered fragilis, though as Bakker & GSP point out, it's clearly NOT the same species as fragilis (they really don't look superbly alike).

Yeah I myself was surprised how big europaeus was.
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:icondontknowwhattodraw94:
Dontknowwhattodraw94 Featured By Owner Jan 2, 2017  Hobbyist Traditional Artist
Could it be they're on of those cases where you see one species merging into another?
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:iconbricksmashtv:
bricksmashtv Featured By Owner Jan 2, 2017  Hobbyist Traditional Artist
anagenesis? Probably not, since in at least one locality in the Morrison you have atrox (AMNH 666) & fragilis (AMNH 600) living together. Though atrox lived a little younger than fragilis iirc (geologcially speaking).
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:iconacepredator:
acepredator Featured By Owner Mar 4, 2017
You can have an ancestral species living with its daughter taxon for a while
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:iconbricksmashtv:
bricksmashtv Featured By Owner Mar 5, 2017  Hobbyist Traditional Artist
indeed
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:iconthedinorocker:
thedinorocker Featured By Owner Dec 22, 2016
A.atrox is consider the same of A.fragilis in licterature...
Still they appear pretty different
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:iconbricksmashtv:
bricksmashtv Featured By Owner Dec 22, 2016  Hobbyist Traditional Artist
Yes I know they're often considered the same. I however disagree with that interpretation, based on they're overall morphology (no I don't believe that is intraspecific variation, they appear far too different).
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:iconthedinorocker:
thedinorocker Featured By Owner Dec 23, 2016
If you re right there Will be 4 or more Allosaurus species, following the trend of licterature just one (A.fragilis) or two (A.sp aka the big al morph) with A.lucasi, A.atrox and A.europaeus filled in Type species:)

Do you read the Allosaurus' section on theropod database ?
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:iconbricksmashtv:
bricksmashtv Featured By Owner Dec 23, 2016  Hobbyist Traditional Artist
I have read it. While Mickey makes some good points, I disagree with it on several issues (such as there being no real difference other than skull shape, that that she thinks there's only one fragilis-morph skull, & of course lumping all of them into fragilis is a big no-no for me).
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:iconshaochilong66:
Shaochilong66 Featured By Owner Dec 18, 2016
muh 13 metr allosauras
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:iconbricksmashtv:
bricksmashtv Featured By Owner Dec 19, 2016  Hobbyist Traditional Artist
lmao
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:iconfranoys:
Franoys Featured By Owner Dec 18, 2016
Ohhhh, mah allos!
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:iconbricksmashtv:
bricksmashtv Featured By Owner Dec 18, 2016  Hobbyist Traditional Artist
XD yes. So many Allos.
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:iconpaleosir:
paleosir Featured By Owner Dec 17, 2016  Hobbyist Traditional Artist
Nice!
I'm going to speculate about their slighly different ecologies based on their different anatomy.
It is very weird Allosaurus europaeus is larger than the morisson Allosaurs, because as far as I know, the morisson had bigger sauropods...
Allosaurus ''jimmadseni'' appears more cursorial due to it's shorter tail, but that's likely just an optical illusion. It's shorter tail combined with it's relatively smaller size would make it more maneuvrable though, making it probably more efficient at running down small ornithopods from ambush, such as Dryosaurus.
A.atrox
and A.fragilis both seem fairly similar.
Except A.fragilis may have a slight advantage in using the hatchet-jaw-hypothesis, while A.atrox seems to have a more conservative carnosaurian skull, with a long maxilla, perfect for probing deep into carcasses of large animals.
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:iconbricksmashtv:
bricksmashtv Featured By Owner Dec 17, 2016  Hobbyist Traditional Artist
hmm. Interesting hypotheses. I've actually though the same for atrox & fragilis before.
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:iconpaleosir:
paleosir Featured By Owner Dec 17, 2016  Hobbyist Traditional Artist
Well, their differences in cranial morphology is very striking.
I think that the genus Allosaurus had about the same kind of ecological diversity as Panthera.
With large, lone species, a large species that hunts in mobs, a more agile one etc.
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:iconcaptainjimmbob:
captainjimmbob Featured By Owner Dec 17, 2016
I was wondering if jimmadseni could be a variant of one of the other two species, but it looks pretty distinct to me, probably ancestral to the other two. It branched off into the two distinct morphologies.

Allosaurus jimmadseni
Allosaurus fragilis (=Saurophaganax? Closer in time to atrox but I think it is more likely that fragilis and atrox would coexist than for this to be an adult atrox; I can't see it being a distinct genus at least; if it is a distinct species it is intermediate from fragilis+atrox to amplexus)
Allosaurus atrox
Allosaurus amplexus

And that would be the four (five?) species of allosaurid in the Morrison. Plus europaeus in the Lourinha.
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:iconbricksmashtv:
bricksmashtv Featured By Owner Dec 17, 2016  Hobbyist Traditional Artist
assuming a more conservative approach it would be:

fragilis
atrox
jimmadseni
amplexus
maximus

so conservatively yes five species (yeah lucasi is just a fragilis)
Reply
:iconpaleojoe:
PaleoJoe Featured By Owner Dec 17, 2016  Student Traditional Artist
Also, I know why Saurophaganax isn't synonymous with Allosaurus; but why do you think Epanterias isn't either?
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:iconbricksmashtv:
bricksmashtv Featured By Owner Dec 17, 2016  Hobbyist Traditional Artist
according to Mickey Mortimer (Theropod Database) Epanterias shares characters with both Sauro & Allo, so it can't be referred to either of them. As well, Epanterias is waaaaaaaay younger than Allo or Sauro (stratigraphically speaking).
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:iconpaleojoe:
PaleoJoe Featured By Owner Dec 17, 2016  Student Traditional Artist
Thank you for the info.:) (Smile) 
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:iconbricksmashtv:
bricksmashtv Featured By Owner Dec 17, 2016  Hobbyist Traditional Artist
no problem
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:iconpaleojoe:
PaleoJoe Featured By Owner Dec 17, 2016  Student Traditional Artist
Great job, I've been looking forward to this for awhile along with the other Tyrannosauri.
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:iconbricksmashtv:
bricksmashtv Featured By Owner Dec 17, 2016  Hobbyist Traditional Artist
you're welcome! I'm glad you've been waiting for this for a while.
Reply
:iconpaleojoe:
PaleoJoe Featured By Owner Dec 17, 2016  Student Traditional Artist
Thanx, yeah. You know your art is good when someone looks forward to it.:) (Smile) 
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:iconbricksmashtv:
bricksmashtv Featured By Owner Dec 17, 2016  Hobbyist Traditional Artist
indeed. It's always a good feeling
Reply
:iconspinosaurus14:
Spinosaurus14 Featured By Owner Dec 17, 2016
Were is dat 12 metr allosawr every boowk is talwkin about?
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:iconbricksmashtv:
bricksmashtv Featured By Owner Dec 17, 2016  Hobbyist Traditional Artist
I have

no idea XD.

The largest Allosaurus specimen (not counting Epanterias or Saurophaganax for now) in NMMNH P-26083, which is about 10.4m. So no 12m Allosaurus AFAIK.
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:iconspinosaurus14:
Spinosaurus14 Featured By Owner Dec 17, 2016
How did this even became a thing?
Reply
:iconbricksmashtv:
bricksmashtv Featured By Owner Dec 17, 2016  Hobbyist Traditional Artist
probably by some outdated children's book figure XD
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