Saturday, June 18, 2016

Giganotosaurs: When did they really become extinct?

Hello everybody! It's been at least a year since i made the original one, and i thought a "remake" would be a good idea. If you haven't read the "original" one don't worry, this one will include everything that was featured in it. As for the new readers: as the title says this article will be about Giganotosaurs, the top predators of the cretaceous South america and my theory/idea(whatever you'd like to call it) that they might lived longer than we tought. Sounds interesting? Than just read it!

Tyrannotitan chubutensis by atrox1
The currently accepted theory is that the last Giganotosaurs lived around 95mya, just like their cousins the Carcharodontosaurs. After that the other predators started to fill the gap left by them. In my opinion this is the most important supporter of their extinction. In North america and Asia the Tyrannosaurs took over the role of the apex predator, in Africa we recently(if i remember correctly in 2014) found a giant but yet unnamed Abelisaurid that might be as big as a T.rex. But in South america we have nothing. There are a couple of Abelisaurids that lived after that, and a few Megaraptora but none of them grew bigger than 8-9m and thats just like when the Giganotosaurs were around.

The unnamed Abelisaur by HodariNundu
Although some of the remains are fragmentary so we can only guess what the animal might looked lke and how big it was exactly, but why they didn't started to get bigger just like the in other parts of the world? And here's an other thing: Titanosaurs. Most people think that the extinction of these giant Sauropods lead to the extinction of Carcharodontosaurs all around the world. There's just one problem with it, in most places there were still giant Titanosaurs after 95mya. For example in South america there was Puertasaurs wich might be at least as big as Argentinosaurus, Futalognkosaurus wich lived around 87-85mya and Dreadnougtus wich lived around 75mya, although the later two might be a bit smaller than Argentinosaurus, it's hard to tell because their remains are very fragmentary or come from a juvenile. And there was Nemegtosaurus in Asia and Alamosaurus in North america, however i don't know if there were any giants before them because both lived around 70-65mya.

Puertasaurus by randomdinos. This is a smaller(28m) version, but as i said the remains are so fragmentary tha we can't tell exactly how big the species was.






There's still a lot to know about the southern continents in the late cretaceous, but as long as fe find an Abelisaur or Megaraptora in South america that lived after 90mya and was at least 10-11m i say that Giganotosaurs survived there, or at least lasted much longer than the other Carcharodontosaurs. But wether you believe it or not is up to you.

Giganotosaurus sculpture by Sfoulkes

2 comments:

  1. I think that the giganotosaurini lasted up until 90 million years ago in South America. The giant sauropods started to get smaller, causing Giganotosaurus and Mapusaurus, the remaining members of the family, to become extinct and gave way to the abelisaurs. The only way to say otherwise is to find more giganotosaurini specimens that lived after 90 million years ago.

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