Gigadino
MemberCompsognathusNovember 08, 2014I'm back, and since there have been a lot of new things during last months, I think it's time to update my top 10 largest Theropods list. You may find some big surprises:
#1. Tyrannosaurus rex
Everybody's favourite meat eater. Called "the absolute wardlord of the Earth" by New York Times in 1905, it's the most famous dinosaur in this list. This guy is pretty big: the largest specimen in called FMHN PR2081, or "Sue", and it's the largest good Theropod specimen: it was around to 3.5 meters tall, with a lenght of 12.3 m. This guy wasn't the longest meat-eaters but, due to its massive built, it was likely among the heaviest. Estimates for "Sue" range from as little as 5.6 t to over 9.5 t. Hartman recently proposed a lower estimate, wich puts this animal at over 8 t. It can beat any other Theropods in my list in terms of weight and since this ranking is about the largest (=heaviest), it earned the first place.
#2, #3, #4: Mapusaurus rosae, Giganotosaurus carolinii, Carcharodontosaurus saharicus
The three largest Carcharodontosaurids are very similar in size, so they share a common place.
Mapusaurus is often thought to be just 10-11 m long. Actually, that's just a myth. Coria & Curria, Mapusaurus's describers, mentioned some specimens comparable in size with Giganotosaurus carolinii's holotype. There is also a specimen wich is 110 % the size of Giganotosaurus carolinii's holotype. That's just a piubic shaft, so we cannot give a precise estimate for this animal. If it was really 110 % the size of G.carolinii's holotype, it was 13.6 m long, but as this is a fragmentary specimen, we don't know if it really was that large. A wiser 12-13 m range is better for large Mapusaurus specimens. A weight range similar to that of Giganotosaurus is also feasible.
One of the well know guys is Giganotosaurus carolinii. This south american Carcharodontosaurid was discovered back in 1993, and it was one of the largest Theropods. The first specimen is a uncomplete skeleton (around to 50-70 % complete), wich is longer than "Sue" (at 12.2-12.4 m), but lighter (at 6-7 t). A second specimen has been discovered. It's a piece of dental, and it's estimated to be 6.5 % larger than the first specimen. If it was really that big, it was 13.2 m long, but again this specimen is very fragmentary, and precise estimates aren't safe. A 12-13 m range for this specimen is pretty good. Weight estimates ranges from 5 to 14 t, but something like 7-8 t is supported by most of the paleontologist.
Carcharodontosaurus saharicus is the most fragmentary of the three. It's been discovered back in 1927, but only recently we realized how big it really was. Its size strongly depends on its proportions: if it was small-headed, like Acrocanthosaurus, well, the largest speimen, SMG-din 1, would have been a huge behemot, at almost 14 meters long. However, a such build is pretty unlikely, as Acrocanthosaurus is a less derivated Carcharodontosaurid. The much closer Giganotosaurus is a big-headed Theropod, so a big-headed build is likely for Carcharodontosaurus saharicus, too. If it was big headed, it would end up between 12 and 13 meters. Again, 12-13 m is the best range for a such fragmentary beast. A weight similar to that of other giant Carcharodontosaurids is likely.
#5: Spinosaurus aegyptiacus
Once regarded as the biggest Theropod, something changed during last months. In fact, Ibrahim et. al proposed a new recostruction based on new materials. This time, the animal was much closer to the ground than before, and it had a much less deep chest, thus the animal would be lighter. There is no official estimate for the new recostruction, but Andrea Cau mentioned a 6-7 t figure, wich would fit perfectly for a such gracile animal. Spinosaurus aegyptiacus still holds the record as longest Theropod though, at 12-15 meters long.
#6: Tyrannotitan chubuitensis
This guy may not be that well know among the public, but it would definitely deserve to: it's got an epic name, rivalling Tyrannosaurus rex itself. Joking aside, Cau called it "the Cinderella of Giant Theropods", because it's often forgotten, when it's the largest Theropod know from good specimens along with T.rex. Its lenght was estimated at 12.2 m, and that's the only estimate I found. There's even a 13 meters one by GSP, but seems to be based on a 13 m Giganotosaurs holotype, wich is doubtfull. The largest specimen is around as big as Giganotosaurus holotype - so, between 6 and 7 t - making it one of the largest Theropod.
#7: Deinocheirus mirificus
This guy is a new entry. Once an unsolved puzzle, today the most depicted dinosaur on Deviant Art. Only recently we realized how much strange (and big) it was; we've new materials, wich includes two new very good preserved skeletons. This animal was in the 6-6.5 t range, according to new estimates based on new specimens, so it was almost as big as Spinosaurus. Its lenght is measured at 11 m long, thus it was pretty long as well. It may hold the record as the tallest Theropod, at over 4 meters tall.
#8: Acrocanthosaurus atokensis
This guy is easily recognizable due to its muscolar ridge on its back. Even though it isn't always mentioned, it's earned its place here, as it's one of the largest Theropod, as well as apex predator of its ecosystem. The largest specimen is called "Fran", and it's indeed pretty big; it's measured to reach 11,5 meters long over the curves. Weight estimates rage between 5 and 6 t, even though Mazzetta proposed a higher weight of 7 t. Cau said that this Theropod was much more gracile than Tyrannosaurus rex, so a 5-6 t range can be good.
#9: Therizinosaurus cheloniformis
This guy isn't mentioned everywhere, but it should. It's the most massively built Theropod, even more than Tyrannosaurus rex, thus it was among the heaviest. This guy is the only herbivore in my ranking, but it was a Theropod, so I included it. I've found a lot of estimates for this animal, but a 10 meters estiamte for lenght appears to be good. This animal could have weighted around to 5 t. It may have been the tallest Theropod, only rivalled by Deinocheirus.
#10: Suchomimus tenerensis
You weren't expecting to find it here, were you? Actually, even though it's often forgotten, it definitely deserves to be there. Suchomimus's type specimen is a sub adult, yet it's very big: it was originally estimated at 11 meters, but GSP later gave a 9.5 m estimate. However, hartman recently made a skeletal of this specimen, wich is 12 meters long. And it even wasn't an adult. Weight estimates rage from 4 to over 5 tonnes, thus a 4-5 t range can be good.
