protoceratops

Any member of a genus of quadrupedal dinosaurs found as fossils in Gobi deposits of the Cretaceous period (144–65 million years ago).

The hind limbs were more strongly developed than the forelimbs; the back was arched. Adults were about 7 ft (2 m) long and probably weighed about 400 lbs (180 kg). The skull was about one-fifth the body length. Bones in the skull grew backward into a perforated frill. The jaws were beaklike and toothed. There may have been a hornlike structure on top of the snout. Long spines on the well-developed tail suggest that protoceratops was semiaquatic.

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▪ dinosaur genus

  ceratopsian dinosaur found as fossils in the Gobi Desert (Gobi) from 80-million-year-old deposits of the Late Cretaceous Period. Protoceratops was a predecessor of the more familiar horned dinosaurs such as Triceratops. Like other ceratopsians, it had a rostral bone on the upper beak and a small frill around the neck, but Protoceratops lacked the large nose and eye horns of more derived ceratopsians.

      Protoceratops evolved from small bipedal ceratopsians such as Psittacosaurus, but Protoceratops was larger and moved about on all four limbs. The hind limbs, however, were more strongly developed than the forelimbs (as expected in an animal that evolved from bipedal ancestors), which gave the back a pronounced arch. Although small for a ceratopsian, Protoceratops was still a relatively large animal. Adults were about 1.8 metres (6 feet) long and would have weighed about 180 kg (400 pounds). The skull was very long, about one-fifth the total body length. Bones in the skull grew backward into a perforated frill. The jaws were beaklike, and teeth were present in both the upper and lower jaws. An area on top of the snout just in front of the eyes may mark the position of a small hornlike structure in adults.

      The remains of hundreds of individuals have been found in all stages of growth. This unusually complete series of fossils has made it possible to work out the rates and manner of growth of Protoceratops and to study the range of variation evident within the genus. Included among Protoceratops remains are newly hatched young. Ellipsoidal eggs laid in circular clusters and measuring about 15 cm (6 inches) long were once attributed to Protoceratops, but they are now known to belong to the small carnivorous dinosaur Oviraptor.

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