科学家新发现南美捕食性恐龙物种

Core Viewpoint - A new predatory dinosaur species named "J.casali" has been discovered in South America, dating back to the Late Cretaceous period, making it a top predator in its region [1] Group 1: Discovery and Characteristics - The species "J.casali" belongs to the theropod family Dromaeosauridae, which existed in Asia, Australia, and South America [1] - The fossil remains include a well-preserved skull, limbs, ribs, and vertebrae, indicating a significant find for understanding this group of dinosaurs [1] - The specimen is determined to be an adult, possibly around 19 years old at the time of death, with an estimated length of about 7 meters and a weight of over 1000 kilograms [1] Group 2: Habitat and Behavior - Evidence from sediment suggests that "J.casali" lived in a warm, humid floodplain environment [1] - Fossilized crocodile leg bones found with the specimen indicate its predatory behavior, suggesting it was a top predator in its ecosystem [1] - The species is believed to have coexisted with other non-avian dinosaurs until the end of the Cretaceous period [1]