Altirhinus

Altirhinus (; "high nose") is a genus of hadrosauroid ornithopod dinosaur from the Early Cretaceous period of Mongolia.

==History of discovery== All known specimens of Altirhinus were recovered in 1981 during collaborative expeditions organized by Soviet and Mongolian scientists, from the Khuren Dukh Formation in the Dornogovi Province of Mongolia. The Khukhtek was formed in the Aptian to Albian stages of the Early Cretaceous Period, which lasted from between 125 and 100.5 million years ago. Psittacosaurus and the primitive ankylosaurid Shamosaurus have also been found in these rocks.