The research doctoral student at the University of Montana and one of the best paleontologists can turn the idea of a triceratops and torozavre as a different species, which lasted more than a hundred years.
Since the 1800s, scientists have believed that Triceratops and torozavr - they are two different species of dinosaur. Triceratops has three horns on the skull and a short collar bone, while torozavr armed with a much larger collar with two large holes in it.
Paleontologists from the University of Michigan, and John Scannell, Jack Horner, in the magazine Journal of Vertebrate Paleontology 14 July, said that Triceratops and torozavr, it’s the same dinosaur ages. They added that this finding fits in the increasingly popular theory, according to which, the diversity of dinosaur species decreased significantly by the end of the era of the dinosaurs.
The confusion is understandable, because in my youth this dinosaur is very different from an adult. Their skull is undergoing significant change as they grow older. Recent studies have found that the skull pahitsefalozavridov and tyrannosaurs, who died about 65 million years ago in North America, is also significantly changed.
This study is an important reminder of the need to consider ontogeny (growth process of young individuals into the adult) as a factor of considerable morphological variation. Otherwise, you can not avoid the appearance of "new" species of dinosaurs.
"Without considering changes in shape throughout ontogeny, we overestimate the risk to the diversity of dinosaur species, and thus distort the real situation regarding the paleoecology of these animals," - said Scannell.
View "torozavr" is much rarer than Triceratops. There was found no torozavra in an immature age. All found the skull "torozavrov" have already been developed and large.
"A significant reduction in species diversity among dinosaurs, made this species vulnerable at precisely the time when the meteorite fell to Earth at the end of the Cretaceous period," - said Scannell. "It could be a combination of two factors - low species diversity and a significant global disaster that led to the extinction of the dinosaurs."