Storia dell'Arte

From North America a new dinosaur: Allosaurus jimmadseni

From USA the new dinosaurus Jimmadseni is a carnivorous predator 5 millions years older than Allosaurus Fragilis

The paleontologists of the Natural History Museum of Utah and other scholars have classified a new dinosaur species the Allosaurus jimmadseni, (name that combines the dinosaur genus with a word that is derived from the surname of the discoverer, James H. Madsen Jr.), characterized by the fact of being carnivorous and having particular bony ridges that run from the eyes to the nose.

Jimmadseni inhabited the flood plains of western North America and lived during the Late Jurassic Period (between 157 and 152 million years ago).

Considerable discovery considering that it is the oldest known species of Allosaurus, preceding even the best known Allosaurus fragilis, also typical of Utah and very far from Allosaurus europaeus found in Europe.

The new species of fossil therefore belongs to the Allosaurus group, a group of biped carnivorous dinosaurs that lived between the Jurassic and the Cretaceous whose name means “strange lizard” or something similar, but the Jimmadseni besides being the largest predatory species and more common than the ecosystem to which it belonged, it evolved no less than 5 million years before Fragilis .

The Jimmadseni is a dinosaur that has several typical characteristics including a short and narrow skull with low facial crests that extend from the horns in front of the eyes to the nose and having a relatively narrow back of the skull with a flat surface in the lower part under the eyes.

The skull was weaker and allows for a narrower field of view than that of his younger cousin Allosaurus fragilis.

In the margin, paleontologists assume that there are somewhere between one and twelve species of Allosaurus in the sequence of sedimentary rocks known as the Morrison Formation (USA).

As for the size of the Jurassic animal, the Allosaurus jimmadseni was between 8 and 9 meters (between 26 and 29 feet) and had to weigh on 4000 pounds or 18 quintals.

Over the past twenty years, the authors of the American Allosaurus study have conducted a morphologically detailed study of what could be considered as all the material about the North American Allosaurus, including important new features that give a new light on the morphology of this dinosaur.

Given the abundance of data available now on Allosaurus, scholars will present their analyzes in publications of various types, as announced in the article Cranial anatomy of Allosaurus jimmadseni

In short, the study on the morphology of the skull , which was mentioned in reference to the bone crests, is only one of those announced on this topic.

The paleontology studies are always interesting, on the one hand can be confusing, requiring the reader a certain cognitive autonomy achieved through scientific knowledge and at the same time are also good for the kids enthralled in original manner than before, with an interest, you might say, not yet corrupted by modernity.

Paleontology can help us to create a more detailed and more truthful vision of the past of our planet, as well as to understand in more depth the biology of prehistoric creatures by approaching more and more likely the origin of life on planet Earth .

We are therefore waiting to learn more from the past and in the meantime the desire to see also much younger rock paintings somewhere in the world subsides, do we dust Jurassic Park off the shelf?

Italian readers are kindly invited to visit page 2

I lettori in lingua italiana sono gentilemente invitati a visitare pagina 2

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