Science, Tech, Math › Animals & Nature 10 Famous Horned Dinosaurs That Weren't Triceratops Discover 10 Fascinating Ceratopsians Share Flipboard Email Print Donald E Hurlbert/Smithsonian Institution Animals & Nature Dinosaurs Basics Paleontologists Carnivores Dinosaurs & Birds Herbivores Marine Reptiles Prehistoric Mammals Amphibians Birds Habitat Profiles Mammals Reptiles Wildlife Conservation Insects Marine Life Forestry Evolution View More By Bob Strauss Science Writer B.S., Cornell University Bob Strauss is a science writer and the author of several books, including "The Big Book of What, How and Why" and "A Field Guide to the Dinosaurs of North America." our editorial process Bob Strauss Updated January 21, 2019 Although it's by far the best known, Triceratops was far from the only ceratopsian (horned, frilled dinosaur) of the Mesozoic Era. in fact, more ceratopsians have been discovered in North America over the past 20 years than any other type of dinosaur. Below you'll find 10 ceratopsians that were every bit the equal of Triceratops, either in size, in ornamentation, or as subjects for research by paleontologists. Aquilops Brian Engh Ceratopsians—horned, frilled dinosaurs— originated in early Cretaceous Asia, where they were about the size of house cats, and evolved to plus sizes only after they settled in North America, tens of millions of years later. The importance of the newly discovered, two-foot-long Aquilops ("eagle face") is that it lived in middle Cretaceous North America and thus represents an important link between early and late ceratopsian species. Centrosaurus Sergey Krasovskiy Centrosaurus is the classic example of what paleontologists refer to as "centrosaurine" ceratopsians, that is, plant-eating dinosaurs possessing large nasal horns and relatively short frills. This 20-foot-long, three-ton herbivore lived a few million years before Triceratops, and it was closely related to three other ceratopsians, Styracosaurus, Coronosaurus, and Spinops. Centrosaurus is represented by literally thousands of fossils, unearthed from massive "bonebeds" in Canada's Alberta province. Koreaceratops Nobu Tamura Discovered on the Korean peninsula, Koreaceratops has been described by some paleontologists as the world's first identified swimming dinosaur. This description relates to the dinosaur's "neural spines" jutting up from its tail, which would have helped propel this 25-pound ceratopsian through the water. Recently, though, much more compelling evidence has been adduced for another swimming dinosaur, the much bigger (and much fiercer) Spinosaurus. Kosmoceratops University of Utah The name Kosmoceratops is Greek for "ornate horned face," and that's a fitting description of this ceratopsian. Kosmoceratops was equipped with such evolutionary bells and whistles as a downward-folding frill and no fewer than 15 horns and horn-like structures of various shapes and sizes. This dinosaur evolved on Laramidia, a large island of western North America that was cut off from the mainstream of ceratopsian evolution during the late Cretaceous period. Such isolation can often explain unusual evolutionary variations. Pachyrhinosaurus Fox You might recognize Pachyrhinosaurus (the "thick-nosed lizard") as the star of the late, unlamented Walking with Dinosaurs: The 3D Movie. Pachyrhinosaurus was one of the few late Cretaceous ceratopsians to lack a horn on its snout; all it had were two small, ornamental horns on either side of its enormous frill. Pentaceratops Sergey Krasovskiy This "five-horned face" really had only three horns, and the third horn (on the end of its snout) wasn't much to write home about. Pentaceratops' real claim to fame is that it possessed one of the largest heads of the entire Mesozoic Era: a whopping 10 feet long, from the top of its frill to the tip of its nose. That makes Pentaceratops' head even longer than that of the closely related Triceratops and presumably just as deadly when wielded in combat. Protoceratops Jordi Payà/WIkimedia Commons Protoceratops was that rare beast of the Mesozoic Era, a mid-sized ceratopsian—not tiny like its predecessors (such as the five-pound Aquilops), or four or five tons like its North American successors, but a pig-sized 400 or 500 pounds. As such, this made the central Asian Protoceratops an ideal prey animal for the contemporary Velociraptor. In fact, paleontologists have identified a famous fossil of a Velociraptor locked in combat with a Protoceratops, before both dinosaurs were buried by a sudden sandstorm. Psittacosaurus Daderot/Wikimedia Commons For decades, Psittacosaurus (the "parrot lizard") was one of the earliest identified ceratopsians, until the recent discovery of a handful of eastern Asian genera that predated this dinosaur by millions of years. As befitting a ceratopsian that lived during the early to middle Cretaceous period, Psittacosaurus lacked any significant horn or frill, to the extent that it took a while for paleontologists to identify it as a true ceratopsian and not an ornithischian dinosaur. Styracosaurus Wikimedia Commons Closely related to Centrosaurus, Styracosaurus had one of the most distinctive heads of any ceratopsian, at least until the recent discovery of bizarre North American genera like Kosmoceratops and Mojoceratops. As with all ceratopsians, the horns and frill of Styracosaurus likely evolved as sexually selected characteristics: males with bigger, more elaborate, more visible headgear had a better chance of intimidating their rivals in the herd and attracting available females during mating season. Udanoceratops Andrey Atuchin The central Asian Udanoceratops was a one-ton contemporary of Protoceratops (meaning it was likely immune from the Velociraptor attacks that plagued its more famous relative). The oddest thing about this dinosaur, though, is that it may have walked occasionally on two legs, like the smaller ceratopsians that preceded it by millions of years.