A New Species of Giant Carnivorous Dinosaur Discovered – Meraxes

A New Species of Giant Carnivorous Dinosaur Discovered
Reconstruction of skeleton showing recovered bones in white. (A) Left side of skull. (B) Right scapulocoracoid (reverse). (C) Right full pelvis (reverse). (D) First two caudal vertebrae. (E) Articulated series of 10 to 15 caudal vertebrae (reverse). (F) Left articulated tibia and fibula in anterolateral view. (G) Left femur in anterior view. (H) Articulated left astragalus and calcaneum in anterior view. (I) Left foot in anterior/dorsal view. (J) Articulated right arm (inverted) in lateral view (note that the words are shown in side view rather than their articulated position). ans, accessory neural spine; subordinate, astragalus; ap, ascending process; stay, calcaneum; co, coracoid; fh, femoral head; fi, fibula; gf, glenoid fossa; h, humerus; ha, hemal arch; il, ilium; ischium; j, jugal; 10, lacrimal; mx, maxilla; n, nose; ns, neural spine; pb, pubic boot; pf, inguinal foramen; po, post-orbital; prz, prezigapophysis; r is the radius; sc, scapula; square meters, squamous; ti, tibia; tp, transverse process; you, ulna. Individual scale bars, 1 cm; overall scale bar, XNUMX m. Skeleton drawing by Jorge A. Gonzalez.

Paleontologists said Thursday they had discovered a new species of giant carnivorous dinosaur with a massive head and tiny arms, just like Tyrannosaurus rex.

of researchers Current Biology According to the findings published in the journal Nature, the newly discovered dinosaur has small forelimbs. These tiny feet are thought to give these creatures a survival advantage.

Beginning with the skull discovered in 2012, Meraxes gigas, named after a fictional dragon in the Game of Thrones book series, was uncovered during four years of field trips in Argentina's northern Patagonia.
“We won the jackpot and almost found it the first morning,” senior author Peter Makovicky of the University of Minnesota told AFP. The fossilized remains were surprisingly well preserved. While the monster is about 36 feet long and weighs four metric tons, its head is just over four feet long.

According to Makovicky, the animal's two-foot-long arms were “actually half the length of its skull and could not reach its mouth.”
T. rex's tiny arms did not come from M. gigas.

The two species were quite far apart on the evolutionary tree, and the second went extinct 20 million years before the first appeared.

Instead, the authors argue that the development of small arms in tyrannosaurids, carcharodontosaurids—the group to which Meraxes belongs—and a third giant predatory species known as abelisaurids offer some advantages.

According to Makovicky, when their heads were larger, the forelimbs were their primary means of being a predator in smaller species.

this image shows the e
This image shows a new dinosaur, Meraxes gigas, in Las Campanas Canyon, 15 km southwest of Villa El Chocon, Neuquen Province, Argentina, on March 2014, 25.

The researchers believe that tyrannosaurs, carcharodontosaurids – belonging to the Meraxes group – and a third giant predatory species called abelisaurids all have evolved tiny arms that point to certain benefits.

in Neuquen, Argentina Ernesto Bachmann Museum of PaleontologyCo-author Juan Canale, who is project leader at , went even further in proposing other benefits.

The Importance of Dinosaur Arms in Mating and Movement Support

“I am convinced that those proportionally small arms have some kind of function,” he said. The skeleton shows large muscle attachments and fully developed thoracic girdles, so the arm had strong muscles.”

"They may have used their arms for reproductive behavior, such as holding the female during mating or supporting her to stand up after a fall."

Makovicky, Meraxes 90 to 100 million years ago Cretaceous He said he traveled around the Earth during the period when the region was wetter, more forested and much closer to the sea.

Contemporary, some of which were discovered in the same area sauropodThey were hunted in a zoo made up of animals.

The individual lived to be about 40 years old—a ripe age for dinosaurs—and the skull was filled with crests, grooves, mounds, and small horns.

“It would definitely look like a very imposing and ugly creature,” said Makovicky. Speculations that the species use their huge skulls as "billboards" to advertise prospective mates, "These are traits that are often under sexual selection in living animals."

source: phys.org

Günceleme: 10/07/2022 21:35

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