Breaking: Small arms on the T. rex and M. gigas may have been key for survival of their species. Click the link to read more. Dinosaurs trex
shows never seen before, complete regions of the skeleton, like the arms and legs that helped us to understand some evolutionary trends and the anatomy of Carcharodontosaurids — the group thatThe study suggests that these two carnivore families evolved independently from each other and that they each happened to develop small arms.became a species and according to Canale, the two dinosaurs are far apart on the evolutionary tree.
“There is no direct relationship between both,” says Canale in a press release, though the author believes that shorter arms gave both the“I’m convinced that those proportionally tiny arms had some sort of function,” Canale says. “The skeleton shows large muscle insertions and fully developed pectoral girdles, so the arm had strong muscles.” These large muscles suggest that the arms did not shrink due to atrophy — or lack of use.— the larger the head, the smaller the arms.
“I’m inclined to think their arms were used in other kinds of activities,” says Canale in a press release. Adding, “they may have used the arms for reproductive behavior such as holding the female during mating or support themselves to stand back up after a break or a fall.” The fossil is in great shape and contains new evidence that can help researchers better understand this species of dinosaur. The skull has crests and small hornets. Canale believes that“Sexual selection is a powerful evolutionary force. But given that we cannot directly observe their behavior, it is impossible to be certain about this,” says Canale in a press release.before it died. The dinosaur was around 45 years old and made its home in northern Patagonia in Argentina.
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