Tyrannosaurus Rex‘s little arm has fired a thousand satirical memes: I love you this A lot; can you pass the salt over? Row, row, row your… oh.
But stand back, biting joker. A newly discovered species of large-headed carnivorous dinosaur with tiny forelimbs suggests the arms were more than just evolutionary punchlines. Arm reduction – along with huge head – Evolved independently in different dinosaur lineagesthe researchers reported on July 7 in Current Biology.
Giant MelaxNamed after a dragon from George R. R. Martin’s A Song of Ice and Fire series that lived between 100 and 90 million years ago in what is now Argentina, Juan Canal, a paleontologist with the country’s CONICET research network Say Buenos Aires.Although very similar Tyrannosaurus Rex, M. gigas Not a Tyrannosaurus rex; it was a carnivore—a member of a distantly related, lesser-known predatory theropod dinosaur. M. gigas Extinct nearly 20 million years ago Tyrannosaurus Rex walk on earth.
This M. gigas They estimated that the individual described by Canale and colleagues was about 45 years old and weighed more than 4 metric tons at the time of death. The fossil specimen is about 11 meters long, and its skull is decorated with bumps, bumps and small horns that may have helped attract mates.
Why these dinosaurs had such small arms is an enduring mystery.They are not for hunting: both Tyrannosaurus Rex and M. gigas use their huge head to hunt prey (Serial Number: 10/22/18).arms may have shrunk so they don’t get in the way During the corpse feeding frenzy.
However, Canale said, M. gigas’ The muscles in the arms are astonishing, suggesting they’re more than just an inconvenient limb. One possibility is that the arms help lift the animal from a reclining position to a standing position. Another is that they aid in mating – perhaps showing some affection to the mate.