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in other projects wikimedia commons wikispecies wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia family of dinosaurs including triceratops and relatives ceratopsids temporal range late cretaceous 82 66 ma 1 preꞓ ꞓ o s d c p t j k pg n montage of four ceratopsids clockwise from top left titanoceratops styracosaurus utahceratops and triceratops scientific classification kingdom animalia phylum chordata class reptilia clade dinosauria clade ornithischia clade ceratopsia clade coronosauria superfamily ceratopsoidea family ceratopsidae marsh 1888 subgroups ceratops dysganus polyonax centrosaurinae chasmosaurinae synonyms agathaumidae cope 1891 torosauridae nopcsa 1915 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 all but one species are known from western north america which formed the island continent of laramidia during most of the late cretaceous ceratopsids are characterized by beaks rows of shearing teeth in the back of the jaw elaborate nasal horns and a thin parietal squamosal shelf that extends back and up into a frill the group is divided into two subfamilies chasmosaurinae and centrosaurinae the chasmosaurines are generally characterized by long triangular frills and well developed brow horns the centrosaurines had well developed nasal horns or nasal bosses shorter and more rectangular frills and elaborate spines on the back of the frill these horns and frills show remarkable variation and are the principal means by which the various species have been recognized their purpose is not entirely clear defense against predators is one possible purpose although the frills are comparatively fragile in many species but it is more likely that as in modern ungulates they were secondary sexual characteristics used in displays or for intraspecific combat the massive bosses on the skulls of pachyrhinosaurus and achelousaurus resemble those formed by the base of the horns in modern musk oxen suggesting that they butted heads centrosaurines have frequently been found in massive bone beds with few other species present suggesting that the animals lived in large herds paleobiology edit behavior edit fossil deposits dominated by large numbers of ceratopsids from individual species suggest that these animals were at least somewhat social 2 however the exact nature of ceratopsid social behavior has historically been controversial 3 in 1997 lehman argued that the aggregations of many individuals preserved in bonebeds originated as local infestations and compared them to similar modern occurrences in crocodiles and tortoises 3 other authors such as scott d sampson interpret these deposits as the remains of large socially complex herds 3 modern animals with mating signals as prominent as the horns and frills of ceratopsians tend to form these kinds of large intricate associations 4 sampson found in previous work that the centrosaurine ceratopsids did not achieve fully developed mating signals until nearly fully grown 5 he finds commonality between the slow growth of mating signals in centrosaurines and the extended adolescence of animals whose social structures are ranked hierarchies founded on age related differences 5 in these sorts of groups young males are typically sexually mature for several years before actually beginning to breed when their mating signals are most fully developed 6 females by contrast do not have such extended adolescence 6 other researchers who support the idea of ceratopsid herding have speculated that these associations were seasonal 7 this hypothesis portrays ceratopsids as living in small groups near the coasts during the rainy season and inland with the onset of the dry season 7 support for the idea that ceratopsids formed herds inland comes from the greater abundance of bonebeds in inland deposits than coastal ones the migration of ceratopsids away from the coasts may have represented a move to their nesting grounds 7 many african herding animals engage in this kind of seasonal herding today 7 herds would also have afforded some level of protection from the chief predators of ceratopsids tyrannosaurids 8 diet edit ceratopsid teeth have a distinctive leaf shape with a primary ridge running down the middle ceratopsids were adapted to processing high fiber plant material with their highly derived dental batteries and advanced dentition 9 their skull morphology is consistent with specialisation for feeding on mechanically challenging low growing plants 10 they may have utilized fermentation to break down plant material with a gut microflora 9 mallon et al 2013 examined herbivore coexistence on the island continent of laramidia during the late cretaceous it was concluded that ceratopsids were generally restricted to feeding on vegetation at or below the height of 1 meter 11 physiology edit main article dinosaur physiology ceratopsians probably had the low mass specific metabolic rat e typical of large bodied animals 9 sexual dimorphism edit ceratopsid skulls at the natural history museum of utah according to scott d sampson if ceratopsids were to have sexual dimorphism modern ecological analogues suggest it would be in their mating signals like horns and frills 12 no convincing evidence for sexual dimorphism in body size or mating signals is known in ceratopsids although it was present in the more primitive ceratopsian protoceratops andrewsi whose sexes were distinguishable based on frill and nasal prominence size 12 this is consistent with other known tetrapod groups where midsized animals tended to exhibit markedly more sexual dimorphism than larger ones 13 however if there were sexually dimorphic traits they may have been soft tissue variations like colorations or dewlaps that would not have been preserved as fossils 13 evolution edit map of north america during the late cretaceous scott d sampson has compared the evolution of ceratopsids to that of some mammal groups both were rapid from a geological perspective and precipitated the simultaneous evolution of large body size derived feeding structures and varied hornlike organs 3 the earliest ceratopsids including members of both centrosaurinae and chasmosaurinae are known from the early campanian stage though the fossil record for early ceratopsids is poor 14 all but one of the named species of ceratopsid is known from western north america which formed the island continent of laramidia during the late cretaceous separated from the island continent of appalachia to the east by the western interior seaway the latitudinal range of ceratopsians across laramidia extends from alaska to mexico the only named ceratopsid outside of laramidia is sinoceratops a centrosaurine from the late campanian of china 1 an indeterminate tooth of a ceratopsid is known from mississippi dating to the late maastrichtian a few million years prior to the close of the cretaceous indicating that ceratopsids dispersed into eastern north america corresponding to the closure of the western interior seaway at the end of the cretaceous 15 paleoecology edit size comparison of eight ceratopsids the chief predators of ceratopsids were tyrannosaurids 8 δ 44 42 ca ratios in tyrannosaurids indicate that ceratopsids were among their most preferred prey 16 there is evidence for an aggressive interaction between a triceratops and a tyrannosaurus in the form of partially healed tyrannosaur tooth marks on a triceratops brow horn and squamosal a bone of the neck frill the bitten horn is also broken with new bone growth after the break it is not known what the exact nature of the interaction was though either animal could have been the aggressor 17 since the triceratops wounds healed it is most likely that the triceratops survived the encounter and managed to overcome the tyrannosaurus paleontologist peter dodson estimates that in a battle against a bull tyrannosaurus the triceratops had the upper hand and would successfully defend itself by inflicting fatal wounds to the tyrannosaurus using its sharp horns 18 the dueling dinosaurs specimen from the hell creek formation shows a triceratops buried in combat with a nanotyrannus 19 20 classification edit the clade ceratopsidae was in 1998 defined by paul sereno as the group including the last common ancestor of pachyrhinosaurus and triceratops and all its descendants 21 in 2004 peter dodson defined it to include triceratops centrosaurus and all descendants of their most recent common ancestor 22 ceratopsidae was given an official definition in the phylocode by daniel madzia and colleagues in 2021 as the smallest clade containing centrosaurus apertus ceratops montanus chasmosaurus belli and triceratops horridus 23 this definition ensures that the type species of ceratopsidae ceratops montanus is included in the clade s definition 23 see also edit dinosaurs portal timeline of ceratopsian research references edit dodson p 1996 the horned dinosaurs princeton university press princeton new jersey pp xiv 346 dodson p currie p j 1990 neoceratopsia 593 618 in weishampel d b dodson p osmólska h eds 1990 the dinosauria university of california press berkeley los angeles oxford 1990 xvi 733 sampson s d 2001 speculations on the socioecology of ceratopsid dinosaurs ornithischia neoceratopsia in mesozoic vertebrate life edited by tanke d h and carpenter k indiana university press pp 263 276 references edit 1 2 dalman sebastian g lucas spencer g jasinki steven g lichtig asher j dodson peter 2021 the oldest centrosaurine a new ceratopsid dinosaur dinosauria ceratopsidae from the allison member of the menefee formation upper cretaceous early campanian northwestern new mexico usa palz 95 2 291 335 bibcode 2021palz 95 291d doi 10 1007 s12542 021 00555 w issn 0031 0220 s2cid 234351502 abstract sampson 2001 page 263 1 2 3 4 introduction sampson 2001 page 264 ceratopsid socioecology sampson 2001 pages 267 268 1 2 retarded growth of mating signals sampson 2001 page 270 1 2 sociological correlates in extant vertebrates sampson 2001 page 265 1 2 3 4 resource exploitation and habitat sampson 2001 page 269 1 2 predation pressure sampson 2001 page 272 1 2 3 resource exploitation and habitat sampson 2001 page 268 mallon jordan c anderson jason s 10 july 2013 butler richard j ed skull ecomorphology of megaherbivorous dinosaurs from the dinosaur park formation upper campanian of alberta canada plos one 8 7 e67182 doi 10 1371 journal pone 0067182 issn 1932 6203 pmc 3707905 pmid 23874409 retrieved 8 february 2026 via plos one mallon jordan c david c evans michael j ryan jason s anderson 2013 feeding height stratification among the herbivorous dinosaurs from the dinosaur park formation upper campanian of alberta canada bmc ecology 13 1 14 bibcode 2013bmce 13 14m doi 10 1186 1472 6785 13 14 pmc 3637170 pmid 23557203 1 2 sexual dimorphism sampson 2001 page 269 1 2 sexual dimorphism sampson 2001 page 270 brown caleb m 2018 01 16 long horned ceratopsidae from the foremost formation campanian of southern alberta peerj 6 e4265 doi 10 7717 peerj 4265 issn 2167 8359 pmc 5774296 pmid 29362697 farke andrew a phillips george e 23 may 2017 the first reported ceratopsid dinosaur from eastern north america owl creek formation upper cretaceous mississippi usa peerj 5 e3342 doi 10 7717 peerj 3342 issn 2167 8359 pmc 5444368 pmid 28560100 michailow mateusz m lugli federico cipriani anna della giustina francesco ferretti annalisa malferrari daniele fowler denver fowler elizabeth freedman weber michael tütken thomas 1 july 2025 combined ca sr isotope and trace element analyses of late cretaceous dinosaur teeth assessing diet versus diagenesis geochimica et cosmochimica acta 400 172 189 doi 10 1016 j gca 2025 05 006 hdl 11380 1380510 retrieved 3 october 2025 via elsevier science direct happ john carpenter kenneth 2008 an analysis of predator prey behavior in a head to head encounter between tyrannosaurus rex and triceratops in carpenter kenneth larson peter e eds tyrannosaurus rex the tyrant king life of the past bloomington indiana university press pp 355 368 isbn 978 0 253 35087 9 dodson peter the horned dinosaurs princeton press p 19 the peculiar case of the dueling dinosaurs missouririvermt com retrieved april 20 2026 nanotyrannus confirmed duelingdinosaurs org retrieved april 20 2026 sereno p c 1998 a rationale for phylogenetic definitions with application to the higher level taxonomy of dinosauria neues jahrbuch für geologie und paläontologie abhandlungen 210 41 83 doi 10 1127 njgpa 210 1998 41 weishampel david b dodson peter osmólska halszka eds 2004 the dinosauria 2nd ed berkeley university of california press isbn 0 520 24209 2 1 2 madzia d arbour v m boyd c a farke a a cruzado caballero p evans d c 2021 the phylogenetic nomenclature of ornithischian dinosaurs peerj 9 e12362 doi 10 7717 peerj 12362 pmc 8667728 pmid 34966571 external links edit media related to ceratopsidae at wikimedia commons data related to ceratopsidae at wikispecies v t e ceratopsia kingdom animalia phylum chordata clade dinosauria clade ornithischia clade marginocephalia avemetatarsalia see avemetatarsalia ornithischia see ornithischia ceratopsia see below ceratopsia ceratopsia albalophosaurus micropachycephalosaurus psittacosaurus chaoyangsauridae chaoyangsaurus hualianceratops stenopelix xuanhuaceratops yinlong neoceratopsia aquilops auroraceratops beg graciliceratops koreaceratops kulceratops liaoceratops microceratus mosaiceratops sasayamagnomus archaeoceratopsidae archaeoceratops helioceratops yamaceratops leptoceratopsidae asiaceratops bainoceratops cerasinops ferrisaurus gremlin gryphoceratops ischioceratops leptoceratops montanoceratops prenoceratops udanoceratops unescoceratops zhuchengceratops protoceratopsidae bagaceratops breviceratops protoceratops ceratopsoidea ajkaceratops ferenceratops turanoceratops zuniceratops ceratopsidae see below ceratopsidae ceratopsidae agathaumas brachyceratops ceratops dysganus monoclonius polyonax chasmosaurinae agujaceratops anchiceratops arrhinoceratops bisticeratops bravoceratops chasmosaurus coahuilaceratops cryptarcus judiceratops kosmoceratops mercuriceratops navajoceratops pentaceratops sierraceratops spiclypeus terminocavus utahceratops vagaceratops triceratopsini eotriceratops nedoceratops ojoceratops regaliceratops tatankaceratops titanoceratops torosaurus triceratops centrosaurinae diabloceratops machairoceratops menefeeceratops sinoceratops wendiceratops xenoceratops albertaceratopsini albertaceratops lokiceratops medusaceratops nasutoceratopsini avaceratops crittendenceratops furcatoceratops nasutoceratops yehuecauhceratops centrosaurini centrosaurus coronosaurus spinops styracosaurus pachyrhinosaurini achelousaurus einiosaurus stellasaurus pachyrhinosaurus see also timeline category taxon identifiers ceratopsidae wikidata q263925 wikispecies ceratopsidae biolib 18741 eol 45...