Einiosaurus
Einiosaurus is an extinct genus of herbivorous dinosaur. It lived in the Cretaceous period in northeastern North America. Its relatives include Triceratops, Styracosaurus, and Utahceratops.
Einiosaurus was a group-living dinosaur of the Ceratopsidae family. Einiosaurus had 3 horns that it used to defend itself from carnivores. But its relative, Styracosaurus, had 7 horns.
The smallest ceratopsian dinosaur was Protoceratops, which was the size of a pig. The largest ceratopsian was Utahceratops with a length of almost 3 meters.
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Einiosaurus Media
Jack Horner led the team that discovered Einiosaurus
Einiosaurus parietal frill bones, including of holotype specimen (A, MOR 456 8-9-6-1)
Subadult Einiosaurus (A, specimen MOR 456 8-8-87-1) and adult holotype (B) skull, with outlines of squamosal bones superimposed for comparison
Size comparison with human
Einiosaurus procurvicornis, a ceratopsian from the Late Cretaceous of Montana, pencil drawing, digital coloring
Reconstructed skull in semi-profile
Postorbitals of Einiosaurus procurvicornis (C and D). (C) MOR 373-6-26-6-3, articulated right prefrontal, palpebral, and postorbital in lateral view; (D) MOR 373-6-24-6-4, right postorbital in lateral view. Abbreviations: bpoh, base of postorbital horncore; poh, postorbital horncore. Scale bars equal 10 cm.
Nasal bones of younger individuals in the top row and older individuals in the bottom row
Diagram showing evolutionary lineage proposed by Horner et al., 1992
Reconstructed skull of Achelousaurus, the direct descendant of Einiosaurus according to Horner, in the Museum of the Rockies
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