Beipiaosaurus.mp4
Автор: jjfajen
Загружено: 2024-08-26
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Beipiaosaurus was a small therizinosaur, measuring 2.2 m (7.2 ft) in length, and before the discovery of Yutyrannus they were the largest dinosaurs known from direct evidence to be feathered. It is estimated to have weighed about 27 kg (60 lb) based on femur length. More advanced therizinosaurids have four functional toes, but the feet of Beipiaosaurus still have reduced inner toes, showing that the derived therizinosaurid condition may have evolved from a three-toed therizinosauroid ancestor. The head was large relative to other therizinosaurs, with the lower jaw measuring about same length as the femur. The neck appears to be shorter compared to other therizinosaurs. In 2003 the pygostyle, consisting of the fused five last vertebrae of the tail, was described in greater detail, suggesting that the original function of the pygostyle was not linked with pennaceous feathers.
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