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Maraapunisaurus fragilimus

By reminegrest
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Speculative skeletal reconstruction based on (let us think) part of dorsal vertebra. If we consider it in terms of primitive diplodocoids, let say, rebbachisaurids, a vertebra should be high with a little vertebral body. Reconstruction is based on the skeleton of Nigersaurus, but the proportions correspond to larger diplodocoids, which gives it a shape similar to Apatosaurus (that also had so high dorsal vertebrae). Total lenght is about 38 m, that makes it not as big as in other estimates, but still huge.
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© 2014 - 2021 reminegrest
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RickRaptor105's avatar
Congrats on predicting the rebbachisaur identity four years ago.
reminegrest's avatar
Well, it's not my idea, but it was predicted some years ago. I only gave it reasonable shape. Now I don't remember the article/blog where I found it, but it was probably from SV-POW.
Wait is this real I thought the vertebrae was lost?
reminegrest's avatar
Indeed, it is lost.
ProcrastinatingStill's avatar
If Amphicoelias is a Rebbachisaurid, that would mean it's not the same as Diplodicus right? BTW at what date did the earliest Rebbachisaurids appear? If it's the early Cretaceous that would make Amphicoelias the earliest known Rebbachisaurid. 
reminegrest's avatar
Regard to the first sentence, yes. I wrote, that it's only a speculation based on single, one, uncertain vertebra. Hypothesis, which assumes membership to Rebbachisauridae also isn't mine. There you have more information and evidence on this:
Whitlock, John A. "A phylogenetic analysis of Diplodocoidea (Saurischia: Sauropoda)." Zoological Journal of the Linnean Society 161.4 (2011): 872-915.
Yes, maybe the earliest, but I can't see the problem. The same case until recently with Archaeopteryx paradox, some ghost lineages. Maybe we should wait for new great discoveries :D
vasix's avatar
38 meters is still no joke where size is concerned. Who put forward the Amphicoelias rebbachisaur theory? Because it really works.
reminegrest's avatar
Well, there is a publication: John A. Whitlock. A phylogenetic analysis of Diplodocoidea (Saurischia: Sauropoda). „Zoological Journal of the Linnean Society”, 2011
Here you have an Amphicoelias as classified in the base of Diplodocoidea, near rebbachisaurids
And there :palaeozoologist.deviantart.com… you can find some interesting thoughts about that
vasix's avatar
It's good that Amphicoelias is being downsized to something more plausible. Actually, at one point, years ago, I thought that Amphicoelias fragillimus was perhaps an elaborate hoax by Cope just to make Marsh feel shitty (M.O: rivalry, especially the Elasmosaurus scene, method: hire an artist to do an exceptional drawing of a huge bone and then spread the word that it got lost)!
Then I started believing in the smaller end of Amphicoelias' size estimates...now it just makes a whole lot more sense....
reminegrest's avatar
Nah, Amphicoelias isn't being downsized, but if it's rebbachisaurid or some other basal diplodocoid, it's more plausible, that it will be shorter than we expect. But it's still a presumption based on one single, uncomplete (and maybe poorly measured) vertebra.
vasix's avatar
Maybe that's why I never really took this genus that seriously...
Sketchy-raptor's avatar
Awesome! This seems far more plausible than most estimates of 50 metres or over, good job!
reminegrest's avatar
Thank you very much!
OldDocHudsonandCO's avatar
Great job on the research and the reconstruction!
reminegrest's avatar
Thank you very much :)
OldDocHudsonandCO's avatar
PeteriDish's avatar
wery interesting! I am actually happy to see that someone took the time to explore the possibility that amphicoelias wasn't actually as riddiculously huge as often claimed.
reminegrest's avatar
It's rather a side-effect of adjustment to rebbachisaurid standards, sill very speculative, and I think that it isn't perfect job on Amphicoelias, but better any than none ;) Thanks
PeteriDish's avatar
you're welcome
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