Centrosaurs in GURPS

Centrosaurs were a group of ceratopsians from Laramidia between 80 and 72 million years ago. They typically had a large frill decorated with horns projecting from the edge; most also sported nose horns, nose rams, or brow horns.

Many, perhaps all, of the centrosaurs were herding animals which traveled in large groups.

• Diabloceratops was one of the earliest centrosaurs. It was found in southern Laramidia from about 83 million to 76 million years ago. Diabloceratops had unique lyre-shaped horns on its frill, and more usual brow horns jutting forward from above its eyes. It was about 5 to 6 meters long, and 2 tons in mass.
• Styracosaurus was 6 meters long and 2.5 to 3 tons in mass, and had a single long horn projecting from its nose. It may be the same animal as Centrosaurus and Monoclonius, with the latter two representing growth stages or sexual differences in Styracosaurus. Styracosaurus lived about 76.5 to 75 million years ago in northern Laramidia.
• Einiosaurus had a "droopy" nose horn, that hooked sharply forward. It was probably used to ram, although the pointed end could still stab. It was about 4.5 meters long and a bit over a ton in mass. Einiosaurus is the likely direct ancestor of Pachyrhinosaurus.
• Pachyrhinosaurus had a single large boss on its nose for slamming and ramming, with a length of eight meters and a mass of four tons. It lived from 73.5 to 71 million years ago in northern Laramidia.
• Nasutoceratops was a centrosaur from southern Laramidia, between 76 and 75 million years ago. It was about 4 to 5 meters in length and 2.5 tons in mass. Nasutoceratops had very long curved brow horns resembling those of cattle.
• Sinoceratops was a Chinese centrosaur from 70 to 65 million years ago. Its ancestors were probably Laramidian immigrants. It was probably around 7 meters long and 3 to 4 tons in mass.

Left to right: Pachyrhinosaurus, human, Styracosaurus, Einiosaurus, Nasutoceratops, Diabloceratops.

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