Einiosaurus
Einiosaurus is a genus of herbivorous dinosaur that lived in the Cretaceous period in northeastern North America. Its relatives are Triceratops, Styracosaurus, Utahceratops, etc. The smallest ceratopsian was Protoceratops which was the size of a pig. Einiosaurus was a group-living herbivorous 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 largest ceratopsian dinosaur was Utahceratops with a length of almost 3m.
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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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