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Teratophoneus's avatar

Alamosaurus sanjuanensis

Alamosaurus sanjuanensis is the biggest north American sauropod found so far. Newer fossils found indicate that this animal approached the size of Argentinosaurus and Puertasaurus ,both from south america, which means that alamosaurus was one of the biggest dinosaurs ever to walk the eart. Alamosaurus is one of the last titanosaurs and the last big sauropod of North america. Alamosaurus was a plant eater with a long neck and a long tail.
My alamosaurus is based on scott hartmans skeletal reconstruction of alamosaurus[link]
although I think my one turned out a bit too compact..
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AcrocanthosaurusA's avatar
I feel like 35-40 meters is a bit oversized.
paleosir's avatar
then your feelings are correct.
RexFan684's avatar
Awesome. Shows that North America is back in the running for having the biggest sauropod. I find it interesting that, at first, Alamosaurus was thought to have only been 50-60 ft long and 20 tons in weight, but now it's known that it was over 100 ft long and 80-100+ tons. Incredible and great comparison.
vasix's avatar
Tyrannosaurus' biggest challenge ever
iherduleikdragonites's avatar
This thing has always been my favorite sauropod, except for maybe Saltasaurus (as I heard of it earlier than almost any other dinosaur), and I'm glad you illustrated it! Keep it up! (By the way, I knew Alamosaurus was huge, but this!? Wow!)
PeteriDish's avatar
what a behemoth! =D
Saberrex's avatar
Wonderful. its about time we saw a model of Alamosaurus to scale. i really wonder how Tyrannosaurus rex could bring one down though.
Teratophoneus's avatar
hmm, t rex maybe hunted in packs/families so I think they would select one of the young or old ones and then target the legs of the alamosaurus to bring it down...
Saberrex's avatar
perhaps. i always have believed females and young lived in groups while males were loners, which may be why we only have 5 male T. rexes on display
humondramon's avatar
Maybe T-rex not only hunted in packs, but (as theorized in "Jurassic Fight Club) T-rex may have had a bite filled with deadly bacteria, taking bites & chunks of the Alamosaur while slowly killing it with infection.
SpinoInWonderland's avatar
JFC is nonsense. So many inaccuracies. The septic bite "theory" has no actual evidence to back it up, and was just pulled out of nowhere.

Alamosaurus is, to put it simply, just far beyond any theropod's league.
Saberrex's avatar
that i agree with too.
EmperorDinobot's avatar
me fucksta so much, I love it. I'm due to make this animal at some time.
JurassicMedia's avatar
Wow. Wie groß konnte der werden? (Höhe)
Und war dieser größer als ein Brachiosaurus?
Teratophoneus's avatar
also er ist definitiv größer als brachiosaurus. Ich glaub aber das ichs mit der höhe ein klein wenig übertrieben hab, der hals müsst etwas länger sein und der rest des körpers ein klein wenig kleiner...von der höhe müste der in etwa so hoch wie puertasaurus sein.
JurassicMedia's avatar
Danke für die Info! ;)
titanlizard's avatar
The alamosaurus evolved from the south-american sauropods? Or the asian sauropods?
MerryMohProductions's avatar
I think it had ancestors in North America.
Paleo-King's avatar
Nope. Probably South America. There were no titanosaurs in North America before Alamosaurus - only basal titanosauriforms, and most of those died out in the mid-cretaceous. South America, the heartland of titanosaurs, was isolated for a long time and only joined with North America in the campanian-maastrichtian epochs at the end of the cretaceous. Alamosaurus has close relatives in South America (like Tapuiasaurus) and apparently was the only titanosaur to migrate into North America. It was the original "border-jumper". :XD:
ProcrastinatingStill's avatar
Actually the early Cretaceous Titanosaurs would be plausible ancestors for Alamosaurus.
Paleo-King's avatar
Doubtful. They are not true titanosaurs in North America. There were basal titanosauriforms like Sauroposeidon. Early-cretaceous North America doesn't have any true titanosaurs... at lease not that we know of. The majority of basal titanosauriforms there didn't get any more derived than Chubutisaurus. Not even euhelopodids, let alone titanosaurs. And they disappeared after the Cenomanian epoch.

Alamosaurus on the other hand is a very derived animal, a nemegtosaur or saltasaur. Clear South American lineage there.
ProcrastinatingStill's avatar
Those basal Titanosauriforms would have been plausible ancestors. Also preservational bias could be at work.

Also inhabitants of an upland environment like Alamosaurus are more likely to be endemic than coastal species, and tend to have less of an ability to cross bodies of water.[
Paleo-King's avatar
I doubt it. Alamosaurus clusters as a saltasaur or nemegtosaur in practically every study ever done. It clusters very closely with Rapetosaurus, Neuquensaurus, Adamantisaurus, etc.,  if you are looking for possible ancestors, best to look there... not with basal titanosauriforms. North America's basal titanosauriformes didn't evolve into titanosaurs, they just died out at the end of the Cenomanian. The derived end of titanosauria, including nemegtosauridae, already existed in South America in the previous epoch, the Albian. The North American forms were primitive stragglers of a much more ancient (likely Jurassic-age) lineage, they definitely were NOT the ancestors of nemegtosauridae. Paluxysaurus, after all, had no time machine to travel back in time to before the Albian! If there is preservational bias, then at some point we should find Alamosaurus-like nemegtosaurs in Albian and Cenomanian deposits in North America, since Tapuiasaurus was already present by that time in South America. No such luck. In fact Tapuiasaurus shows that the nemegtosaur lineage evolved far earlier than once thought, and likely did so in South America, at a time when North America was cut off from it (and from every other continent - the land bridges of the Campanian/Maastrichtian still did not exist).

For something like Paluxysaurus to transform into Alamosaurus takes way too many taxonomic steps, including several REVERSALS of already-proven evolutionary steps at the far-basal end of titanosauriformes (i.e. where Chubutisauridae diverged from the main line of titanosauriform evolution that ultimately led to true titanosaurs.) If the North American forms had survived past the Cenomanian and evolved into something new, it would not have been a titanosaur. Just another basal somphospondylian, more advanced than the common titanosauriform ancestor, but in a VERY different way than the titanosaurs. To argue otherwise would be to ignore all the evidence, and to invent a new dinosaurian form of discredited "polygenic" racial theories like Haeckelism.

A proven titanosaur cannot "re-evolve" from a group that long before split off from the ancestors of titanosauria. Once you split off from another lineage, you're not going to give rise to its descendants. To put it another way, you can't be the father of your 10th cousins whom you've never met... or their descendants. :XD:
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