Fossil Psittacosaurus Dinosaur Skeleton Authentic skeleton of the dinosaur Psittacosaurus. Fossilized skeleton of the dinosaur Psittacosaurus. A genus of horned dinosaurs that lived in the Lower Cretaceous period (approx. 125-105 million years ago) in what is now Asia. The type species is Psittacosaurus mongoliensis, as described by Henry Osborn in 1923. This rarity is a classic paleontological exhibit, the skeleton rests on limestone rocks, an exhibit from past eras. Exhibition dimensions: 27x21 cm plate. 21.5x14.5 cm animal body. Contact us if you are interested.