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Triceratops (/ t r aɪ ˈ s ɛr ə t ɒ p s / try-SERR-ə-tops; [1] lit. ' three-horned face ') is a genus of chasmosaurine ceratopsian dinosaur that lived during the late Maastrichtian age of the Late Cretaceous period, about 68 to 66 million years ago in what is now western North America.
The closest is the Dinosaur Genera List, compiled by biological nomenclature expert George Olshevsky, which was first published online in 1995 and was regularly updated until June 2021. [ 1 ] [ 2 ] The most authoritative general source in the field is the second (2004) edition of The Dinosauria .
Ceratopsidae (sometimes spelled Ceratopidae) is a family of ceratopsian dinosaurs including Triceratops, Centrosaurus, and Styracosaurus.All known species were quadrupedal herbivores from the Upper Cretaceous.
Triceratops is by far the best-known ceratopsian to the general public. It is traditional for ceratopsian genus names to end in " -ceratops ", although this is not always the case. One of the first named genera was Ceratops itself, which lent its name to the group, although it is considered a nomen dubium today as its fossil remains have no ...
Dinosaur classification began in 1842 when Sir Richard Owen placed Iguanodon, Megalosaurus, and Hylaeosaurus in "a distinct tribe or suborder of Saurian Reptiles, for which I would propose the name of Dinosauria."
Marsh also named the eponymous genus Ceratops in 1888. [2] The next year, he named the most famous ceratopsian, Triceratops horridus. It was the discovery of Triceratops that illuminated the ceratopsian body plan, [1] and he formally named the Ceratopsia in 1890. [3] The early 20th century was a fruitful time for ceratopsian research.
One individual might represent the "type specimen" of a particular species. This species would in turn represent the "type species" of a particular genus, unless it is referred to a previously described genus. Most dinosaur genera are monospecific, therefore most type specimens are also the type species of their respective genera.
In 2010, Gregory S. Paul renamed the species Triceratops xerinsularis, [3] but this inclusion of Eotriceratops in the existing genus Triceratops has not been followed by other researchers. Possible additional specimens, which have been variously included in the species Ojoceratops fowleri and Torosaurus utahensis , are known from the same time ...