Name
|
Year
|
Formation
|
Location
|
Notes
|
Images
|
Abydosaurus
|
2010
|
Cedar Mountain Formation (
Early Cretaceous,
Albian)
|
United States (
Utah)
|
Had a short domed crest on its skull similar to that of
Giraffatitan
|
|
Acantholipan
|
2018
|
Pen Formation (
Late Cretaceous,
Santonian)
|
Mexico (
Coahuila)
|
Known to possess spike-like osteoderms
|
|
Achelousaurus
|
1994
|
Two Medicine Formation (
Late Cretaceous,
Campanian)
|
United States (
Montana)
|
Combines long spikes on the top of its frill and a low keratinous boss over its eyes and nose
|
|
Acheroraptor
|
2013
|
Hell Creek Formation (
Late Cretaceous,
Maastrichtian)
|
United States (
Montana)
|
One of the geologically youngest dromaeosaurids
|
|
Acristavus
|
2011
|
Two Medicine Formation,
Wahweap Formation (
Late Cretaceous,
Campanian)
|
United States (
Montana
Utah)
|
Uniquely for a hadrosaurid, it lacked any ornamentation on its skull
|
|
Acrocanthosaurus
|
1950
|
Antlers Formation,
Arundel Formation,
Cloverly Formation,
Twin Mountains Formation (
Early Cretaceous,
Aptian to
Albian)
|
United States (
Maryland
Oklahoma
Texas
Wyoming)
|
Possessed elongated neural spines that would have supported a low sail or hump in life
|
|
Acrotholus
|
2013
|
Milk River Formation (
Late Cretaceous,
Santonian)
|
Canada (
Alberta)
|
Had a tall, oval-shaped dome
|
|
Adelolophus
|
2014
|
Wahweap Formation (
Late Cretaceous,
Campanian)
|
United States (
Utah)
|
Potentially a close relative of
Parasaurolophus
[5]
|
|
Agujaceratops
|
2006
|
Aguja Formation (
Late Cretaceous,
Campanian)
|
United States (
Texas)
|
The type species was originally assigned to the genus
Chasmosaurus
|
|
Ahshislepelta
|
2011
|
Kirtland Formation (
Late Cretaceous,
Campanian)
|
United States (
New Mexico)
|
Relatively small compared to other North American ankylosaurs
|
|
Akainacephalus
|
2018
|
Kaiparowits Formation (
Late Cretaceous,
Campanian)
|
United States (
Utah)
|
Much of the skeleton is known, including the entirety of the skull
|
|
Alamosaurus
|
1922
|
Black Peaks Formation,
El Picacho Formation,
Evanston Formation?,
Javelina Formation,
North Horn Formation,
Ojo Alamo Formation (
Late Cretaceous,
Maastrichtian)
|
United States (
New Mexico
Texas
Utah
Wyoming?)
|
The only titanosaur confirmed to have crossed into North America. One of the largest dinosaurs known from the continent
[6]
|
|
Alaskacephale
|
2006
|
Prince Creek Formation (
Late Cretaceous,
Maastrichtian)
|
United States (
Alaska)
|
Had an array of polygonal nodes on its
squamosal
|
|
Albertaceratops
|
2007
|
Oldman Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
|
Possessed long brow horns and a bony ridge over its nose
|
|
Albertadromeus
|
2013
|
Oldman Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
|
The proportions of its hindlimb suggest a cursorial lifestyle
|
|
Albertavenator
|
2017
|
Horseshoe Canyon Formation (
Late Cretaceous,
Maastrichtian)
|
Canada (
Alberta)
|
Its discovery suggests the diversity of small dinosaurs may be higher than previously thought
|
|
Albertonykus
|
2009
|
Horseshoe Canyon Formation (
Late Cretaceous,
Maastrichtian)
|
Canada (
Alberta)
|
May have used its specialized forelimbs to dig into tree trunks for termites
[7]
|
|
Albertosaurus
|
1905
|
Horseshoe Canyon Formation (
Late Cretaceous,
Maastrichtian)
|
Canada (
Alberta)
|
Known from more than thirty specimens, twenty-six of which are preserved together
[8]
|
|
Aletopelta
|
2001
|
Point Loma Formation (
Late Cretaceous,
Campanian)
|
United States (
California)
|
Would have lived in present-day Mexico; its fossils were only found in California due to the shifting of tectonic plates
|
|
Allosaurus
|
1877
|
Morrison Formation (
Late Jurassic,
Kimmeridgian to
Tithonian)
|
United States (
Colorado
Utah
Wyoming)
|
Multiple specimens have been discovered, making it well-known both popularly and scientifically. At least two species are known from the United States, with a third described from Portugal
|
|
Ampelognathus
|
2023
|
Lewisville Formation (
Late Cretaceous,
Cenomanian)
|
United States (
Texas)
|
More closely related to iguanodonts than to the morphologically similar "hypsilophodonts"
[9]
|
|
Amphicoelias
|
1878
|
Morrison Formation (
Late Jurassic,
Tithonian)
|
United States (
Colorado)
|
Originally believed to date from the Cretaceous
|
|
Anasazisaurus
|
1993
|
Kirtland Formation (
Late Cretaceous,
Campanian)
|
United States (
New Mexico)
|
May have been a second species of
Kritosaurus
[10]
|
|
Anchiceratops
|
1914
|
Horseshoe Canyon Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
|
Had a long, rectangular frill ringed by short, triangular spikes
|
|
Anchisaurus
|
1885
|
Portland Formation (
Early Jurassic,
Hettangian to
Sinemurian)
|
United States (
Connecticut
Massachusetts)
|
Some possible remains were originally misidentified as human skeletons
[11]
|
|
Angulomastacator
|
2009
|
Aguja Formation (
Late Cretaceous,
Campanian)
|
United States (
Texas)
|
The tip of its jaw was angled 45 degrees downward, with the tooth row bent to match
|
|
Animantarx
|
1999
|
Cedar Mountain Formation (
Early Cretaceous to
Late Cretaceous,
Albian to
Cenomanian)
|
United States (
Utah)
|
Its holotype was discovered during a radiological survey of a fossil site; no bones were exposed before it was excavated
|
|
Ankylosaurus
|
1908
|
Ferris Formation,
Frenchman Formation,
Hell Creek Formation,
Lance Formation,
Scollard Formation (
Late Cretaceous,
Maastrichtian)
|
Canada (
Alberta
Saskatchewan)
United States (
Montana
Wyoming)
|
The largest and most well-known ankylosaur
|
|
Anodontosaurus
|
1929
|
Horseshoe Canyon Formation (
Late Cretaceous,
Campanian to
Maastrichtian)
|
Canada (
Alberta)
|
Originally mistakenly believed to have been toothless
|
|
Anzu
|
2014
|
Hell Creek Formation (
Late Cretaceous,
Maastrichtian)
|
United States (
Montana
North Dakota
South Dakota)
|
Large and known from considerably good remains. Preserves evidence of a tall head crest
|
|
Apatoraptor
|
2016
|
Horseshoe Canyon Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
|
Quill knobs preserved on its ulna confirm this species had wings
|
|
Apatosaurus
|
1877
|
Morrison Formation (
Late Jurassic,
Kimmeridgian to
Tithonian)
|
United States (
Colorado
New Mexico
Oklahoma
Utah
Wyoming)
|
Had a characteristically robust skeleton compared to other diplodocids
|
|
Appalachiosaurus
|
2005
|
Demopolis Chalk,
Donoho Creek Formation?,
Tar Heel Formation? (
Late Cretaceous,
Campanian)
|
United States (
Alabama
North Carolina?
South Carolina?)
|
The most complete theropod known from
the eastern side of North America
|
|
Aquilarhinus
|
2019
|
Aguja Formation (
Late Cretaceous,
Campanian)
|
United States (
Texas)
|
May have been a semiaquatic, coastal species that used its unusual, shovel-shaped bill to scoop up vegetation in wet sediment
[12]
|
|
Aquilops
|
2014
|
Cloverly Formation (
Early Cretaceous,
Albian)
|
United States (
Montana)
|
May have had a short horn protruding from its upper beak
|
|
Arkansaurus
|
2018
|
Trinity Group (
Early Cretaceous,
Aptian to
Albian)
|
United States (
Arkansas)
|
State dinosaur of Arkansas. Its generic name was in use informally even before its formal description
|
|
Arrhinoceratops
|
1925
|
Horseshoe Canyon Formation (
Late Cretaceous,
Campanian to
Maastrichtian)
|
Canada (
Alberta)
|
Described as lacking a nasal horn although this is an artifact of preservation
|
|
Astrodon
|
1859
|
Antlers Formation?,
Arundel Formation (
Early Cretaceous,
Albian)
|
United States (
Maryland
Oklahoma?)
|
State dinosaur of Maryland
|
|
Astrophocaudia
|
2012
|
Trinity Group (
Early Cretaceous,
Albian)
|
United States (
Texas)
|
Known from a single partial skeleton
|
|
Atlantosaurus
|
1877
|
Morrison Formation (
Late Jurassic,
Kimmeridgian)
|
United States (
Colorado)
|
Potentially synonymous with
Apatosaurus,
[13] but a referred species may represent a separate taxon
[14]
|
|
Atrociraptor
|
2004
|
Horseshoe Canyon Formation (
Late Cretaceous,
Maastrichtian)
|
Canada (
Alberta)
|
Had a short, deep snout with enlarged teeth
|
|
Aublysodon
|
1868
|
Judith River Formation (
Late Cretaceous,
Campanian)
|
United States (
Montana)
|
Only known from teeth
|
|
Augustynolophus
|
2014
|
Moreno Formation (
Late Cretaceous,
Maastrichtian)
|
United States (
California)
|
State dinosaur of California. Originally named as a species of
Saurolophus
|
|
Avaceratops
|
1986
|
Judith River Formation (
Late Cretaceous,
Campanian)
|
United States (
Montana)
|
Lacked the fenestrae in its frill, a feature shared only with
Triceratops
|
|
Bambiraptor
|
2000
|
Two Medicine Formation (
Late Cretaceous,
Campanian)
|
United States (
Montana)
|
Small but well-preserved enough to display its mix of dinosaur- and bird-like features
|
|
Barosaurus
|
1890
|
Morrison Formation (
Late Jurassic,
Tithonian)
|
United States (
South Dakota
Utah)
|
Similar to
Diplodocus but larger and with a longer neck
|
|
Bistahieversor
|
2010
|
Fruitland Formation,
Kirtland Formation (
Late Cretaceous,
Campanian)
|
United States (
New Mexico)
|
Analysis of its braincase suggest it behaved like tyrannosaurids despite not being a member of that family
[15]
|
|
Bisticeratops
|
2022
|
Kirtland Formation (
Late Cretaceous,
Campanian)
|
United States (
New Mexico)
|
Preserves bite marks from a tyrannosaurid
|
|
Borealopelta
|
2017
|
Clearwater Formation (
Early Cretaceous,
Albian)
|
Canada (
Alberta)
|
So well preserved that several osteoderms, keratin, pigments, and stomach contents are preserved in the positions they would been in while alive, without flattening or shriveling
|
|
Boreonykus
|
2015
|
Wapiti Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
|
One of the few dromaeosaurids known from high latitudes
|
|
Brachiosaurus
|
1903
|
Morrison Formation (
Late Jurassic,
Kimmeridgian to
Tithonian)
|
United States (
Colorado
Oklahoma
Utah
Wyoming)
|
A high browser with a tall chest and elongated forelimbs
|
|
Brachyceratops
|
1914
|
Two Medicine Formation (
Late Cretaceous,
Campanian)
|
United States (
Montana)
|
Only known from juvenile remains. One specimen has been found to represent a subadult
Styracosaurus ovatus
|
|
Brachylophosaurus
|
1953
|
Judith River Formation,
Oldman Formation,
Wahweap Formation? (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
United States (
Montana
Utah?)
|
Several specimens preserve extensive soft tissue remains
|
|
Bravoceratops
|
2013
|
Javelina Formation (
Late Cretaceous,
Campanian to
Maastrichtian)
|
United States (
Texas)
|
May have had a single small horn on the top of its frill
|
|
Brontomerus
|
2011
|
Cedar Mountain Formation (
Early Cretaceous,
Aptian to
Albian)
|
United States (
Utah)
|
Possessed an enlarged ilium which supported powerful leg muscles, which it may have used to kick away predators
|
|
Brontosaurus
|
1879
|
Morrison Formation (
Late Jurassic,
Kimmeridgian)
|
United States (
Utah
Wyoming)
|
Popularly associated with
Apatosaurus but a 2015 study found enough differences for it to be classified as a separate genus
[14]
|
|
Caenagnathus
|
1940
|
Dinosaur Park Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
|
One of the largest known caenagnathids
[16]
|
|
Camarasaurus
|
1877
|
Morrison Formation,
Summerville Formation? (
Late Jurassic,
Kimmeridgian to
Tithonian)
|
United States (
Colorado
New Mexico?
Oklahoma?
South Dakota?
Utah
Wyoming)
|
Very common and known from multiple specimens
|
|
Camposaurus
|
1998
|
Bluewater Creek Formation (
Late Triassic,
Norian)
|
United States (
Arizona)
|
Potentially the oldest known neotheropod
|
|
Camptosaurus
|
1885
|
Morrison Formation (
Late Jurassic,
Oxfordian to
Tithonian)
|
United States (
Utah
Wyoming)
|
May have fed on tough vegetation as evidenced by extensive wear frequently exhibited on its teeth
[17]
|
|
Caseosaurus
|
1998
|
Dockum Group (
Late Triassic,
Norian)
|
United States (
Texas)
|
Possibly synonymous with
Chindesaurus
|
|
Cedarosaurus
|
1999
|
Cedar Mountain Formation (
Early Cretaceous,
Valanginian)
|
United States (
Utah)
|
One specimen preserves over a hundred gastroliths
[18]
|
|
Cedarpelta
|
2001
|
Cedar Mountain Formation (
Late Cretaceous,
Cenomanian to
Turonian)
|
United States (
Utah)
|
Lacked the extensive cranial ornamentation of later ankylosaurs
|
|
Cedrorestes
|
2007
|
Cedar Mountain Formation (
Early Cretaceous,
Valanginian)
|
United States (
Utah)
|
Known from a partial skeleton. The specific name, C. crichtoni, is named after
Michael Crichton, author of
Jurassic Park
|
|
Centrosaurus
|
1904
|
Dinosaur Park Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
|
Hundreds of individuals have been preserved in a single "mega-bonebed"
[19]
|
|
Cerasinops
|
2007
|
Two Medicine Formation (
Late Cretaceous,
Campanian)
|
United States (
Montana)
|
Combines features of both Asian and American basal ceratopsians
|
|
Ceratops
|
1888
|
Judith River Formation (
Late Cretaceous,
Campanian)
|
United States (
Montana)
|
Although only known from a few bones, this genus is the namesake of the Ceratopsia and the Ceratopsidae
|
|
Ceratosaurus
|
1884
|
Morrison Formation (
Late Jurassic,
Oxfordian to
Tithonian)
|
United States (
Colorado
Utah
Wyoming)
|
Possessed a row of osteoderms running down its back
|
|
Chasmosaurus
|
1914
|
Dinosaur Park Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
|
Known from multiple remains, including various skulls
|
|
Chindesaurus
|
1995
|
Chinle Formation (
Late Triassic,
Norian)
|
United States (
Arizona)
|
May be a herrerasaur or a close relative of
Tawa
[20]
|
|
Chirostenotes
|
1924
|
Dinosaur Park Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
|
Originally known only from isolated body parts
|
|
Cionodon
|
1874
|
Denver Formation,
Judith River Formation (
Late Cretaceous,
Campanian to
Maastrichtian)
|
Canada (
Alberta)
United States (
Colorado)
|
Poorly known
|
|
Citipes
|
2020
|
Dinosaur Park Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
|
Some specimens were found as stomach contents of
Gorgosaurus
[21]
|
|
Claosaurus
|
1890
|
Niobrara Formation (
Late Cretaceous,
Santonian to
Campanian)
|
United States (
Kansas)
|
Historically conflated with other hadrosaurs
|
|
Coahuilaceratops
|
2010
|
Cerro del Pueblo Formation (
Late Cretaceous,
Campanian)
|
Mexico (
Coahuila)
|
Possessed the longest brow horns of any ceratopsian
|
|
Coelophysis
|
1889
|
Chinle Formation (
Late Triassic,
Carnian to
Rhaetian)
|
United States (
Arizona
New Mexico)
|
Known from over a thousand specimens, making it one of the more well-known early dinosaurs. Some referred species may belong to their own genera
|
|
Coelurus
|
1879
|
Morrison Formation (
Late Jurassic,
Kimmeridgian)
|
United States (
Wyoming)
|
Potentially an early member of the tyrannosauroid lineage
[22]
|
|
Colepiocephale
|
2003
|
Foremost Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
|
Originally described as a species of
Stegoceras
|
|
Convolosaurus
|
2019
|
Twin Mountains Formation (
Early Cretaceous,
Aptian)
|
United States (
Texas)
|
Before its formal description, it had been informally referred to as the "
Proctor Lake hypsilophodont"
|
|
Coronosaurus
|
2012
|
Oldman Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
|
Had irregular masses of small spikes on the very top of its frill
|
|
Corythosaurus
|
1914
|
Dinosaur Park Formation,
Oldman Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
|
Possessed a semicircular crest which may have been used for vocalization
|
|
Crittendenceratops
|
2018
|
Fort Crittenden Formation (
Late Cretaceous,
Campanian)
|
United States (
Arizona)
|
The youngest known member of the Nasutoceratopsini
|
|
Daemonosaurus
|
2011
|
Chinle Formation (
Late Triassic,
Rhaetian)
|
United States (
New Mexico)
|
Unique among early dinosaurs for possessing a short snout with long teeth
|
|
Dakotadon
|
2008
|
Lakota Formation (
Early Cretaceous,
Barremian)
|
United States (
South Dakota)
|
Originally named as a species of
Iguanodon
|
|
Dakotaraptor
|
2015
|
Hell Creek Formation (
Late Cretaceous,
Maastrichtian)
|
United States (
South Dakota)
|
The holotype assemblage may represent a chimera of multiple taxa
[23]
|
|
Daspletosaurus
|
1970
|
Dinosaur Park Formation,
Judith River Formation,
Oldman Formation,
Two Medicine Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
United States (
Montana)
|
At least three species are known. These have been interpreted as forming an anagenetic lineage
[24] but this hypothesis has been criticized
[25]
|
|
Deinonychus
|
1969
|
Antlers Formation,
Arundel Formation?,
Cedar Mountain Formation?,
Cloverly Formation (
Early Cretaceous,
Aptian to
Albian)
|
United States (
Maryland?
Montana
Oklahoma
Utah?
Wyoming)
|
Its discovery helped researchers realize that dinosaurs were active, warm-blooded animals, kicking off the
Dinosaur Renaissance
|
|
Denversaurus
|
1988
|
Lance Formation (
Late Cretaceous,
Maastrichtian)
|
United States (
South Dakota
Wyoming)
|
The youngest known nodosaurid
[26]
|
|
Diabloceratops
|
2010
|
Wahweap Formation (
Late Cretaceous,
Campanian)
|
United States (
Utah)
|
Had a distinctively short and deep skull
|
|
Diclonius
|
1876
|
Judith River Formation (
Late Cretaceous,
Campanian)
|
United States (
Montana)
|
Replaced its teeth in such a way that new teeth could be used at the same time as older ones
|
|
Dilophosaurus
|
1970
|
Kayenta Formation (
Early Jurassic,
Sinemurian to
Pliensbachian)
|
United States (
Arizona)
|
Possessed two semicircular crests running along the length of the skull
|
|
Dineobellator
|
2020
|
Ojo Alamo Formation (
Late Cretaceous,
Maastrichtian)
|
United States (
New Mexico)
|
Several features of its hands and feet may be adaptations for increased grip strength
[27]
|
|
Diplodocus
|
1878
|
Morrison Formation (
Late Jurassic,
Kimmeridgian)
|
United States (
Colorado
Montana
New Mexico
Utah
Wyoming)
|
Had a long, thin tail. Popularly thought to have been used like a bullwhip
[28] but it is possible that it could not handle the stress of supersonic travel
[29]
|
|
Diplotomodon
|
1868
|
Hornerstown Formation?/
Navesink Formation? (
Late Cretaceous,
Maastrichtian)
|
United States (
New Jersey)
|
Has been suggested to be non-dinosaurian
|
|
Dromaeosaurus
|
1922
|
Dinosaur Park Formation (
Late Cretaceous,
Campanian to
Maastrichtian)
|
Canada (
Alberta)
|
Analysis of wear on its teeth suggest it preferred tougher prey, including bone
|
|
Dromiceiomimus
|
1972
|
Horseshoe Canyon Formation (
Late Cretaceous,
Maastrichtian)
|
Canada (
Alberta)
|
May be synonymous with
Ornithomimus edmontonicus
|
|
Dryosaurus
|
1894
|
Morrison Formation (
Late Jurassic,
Kimmeridgian to
Tithonian)
|
United States (
Colorado
Utah
Wyoming)
|
Remains of multiple growth stages have been found, including embryoes
[30]
|
|
Dryptosaurus
|
1877
|
Hornerstown Formation?/
New Egypt Formation? (
Late Cretaceous,
Maastrichtian)
|
United States (
New Jersey)
|
Its discovery showed that theropods were bipedal animals
|
|
Dynamoterror
|
2018
|
Menefee Formation (
Late Cretaceous,
Campanian)
|
United States (
New Mexico)
|
Part of the Teratophoneini, a clade of exclusively southwestern American tyrannosaurs
[25]
|
|
Dyoplosaurus
|
1924
|
Dinosaur Park Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
|
The holotype specimen preserves skin impressions
[31]
|
|
Dysganus
|
1876
|
Judith River Formation (
Late Cretaceous,
Campanian)
|
United States (
Montana)
|
Four species have been named, all from isolated teeth
|
|
Dyslocosaurus
|
1992
|
Lance Formation?/
Morrison Formation? (
Late Jurassic,
Kimmeridgian?/
Late Cretaceous,
Maastrichtian?)
|
United States (
Wyoming)
|
Has been suggested to have four claws on its hind limbs
|
|
Dystrophaeus
|
1877
|
Morrison Formation (
Late Jurassic,
Oxfordian)
|
United States (
Utah)
|
Inconsistent in phylogenetic placement, although undescribed remains could further clarify its relationships
|
|
Edmontonia
|
1928
|
Dinosaur Park Formation,
Horseshoe Canyon Formation,
Judith River Formation? (
Late Cretaceous,
Campanian to
Maastrichtian)
|
Canada (
Alberta)
United States (
Montana?)
|
Possessed forward-pointing, bifurcated spikes on its shoulders
|
|
Edmontosaurus
|
1917
|
Frenchman Formation,
Hell Creek Formation,
Horseshoe Canyon Formation,
Lance Formation,
Prince Creek Formation (
Late Cretaceous,
Campanian to
Maastrichtian)
|
Canada (
Alberta
Saskatchewan)
United States (
Alaska
Colorado
Montana
North Dakota
South Dakota
Wyoming)
|
Known from multiple well-preserved specimens, including a few "mummies". Several were originally assigned to their own genera and/or species
|
|
Einiosaurus
|
1994
|
Two Medicine Formation (
Late Cretaceous,
Campanian)
|
United States (
Montana)
|
Distinguished by its forward-curving nasal horn
|
|
Eolambia
|
1998
|
Cedar Mountain Formation (
Late Cretaceous,
Cenomanian)
|
United States (
Utah)
|
Remains of multiple individuals are known, making up much of the skeleton
|
|
Eotrachodon
|
2016
|
Mooreville Chalk (
Late Cretaceous,
Santonian)
|
United States (
Alabama)
|
Had a saurolophine-like skull despite its basal position
[32]
|
|
Eotriceratops
|
2007
|
Horseshoe Canyon Formation (
Late Cretaceous,
Maastrichtian)
|
Canada (
Alberta)
|
May have been the largest known ceratopsid
|
|
Epichirostenotes
|
2011
|
Horseshoe Canyon Formation (
Late Cretaceous,
Maastrichtian)
|
Canada (
Alberta)
|
Its discovery allowed researchers to connect isolated caenagnathid body parts to each other
|
|
Euoplocephalus
|
1910
|
Dinosaur Park Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
|
Unusually, its
palpebral bone was mobile, allowing it to be used as an eyelid
[33]
|
|
Falcarius
|
2005
|
Cedar Mountain Formation (
Early Cretaceous,
Valanginian)
|
United States (
Utah)
|
Transitional between generalized theropods and specialized therizinosaurs
|
|
Ferrisaurus
|
2019
|
Tango Creek Formation (
Late Cretaceous,
Maastrichtian)
|
Canada (
British Columbia)
|
Its holotype was discovered close to a railway line
[34]
|
|
Foraminacephale
|
2016
|
Dinosaur Park Formation,
Oldman Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
|
Originally assigned to three different pachycephalosaurid genera
|
|
Fosterovenator
|
2014
|
Morrison Formation (
Late Jurassic,
Oxfordian to
Tithonian)
|
United States (
Wyoming)
|
Has been variously described as a ceratosaurid, a tetanuran, or a close relative of
Elaphrosaurus
[35]
|
|
Fruitadens
|
2010
|
Morrison Formation (
Late Jurassic,
Tithonian)
|
United States (
Colorado)
|
One of the smallest known ornithischians
[36]
|
|
Furcatoceratops
|
2023
|
Judith River Formation (
Late Cretaceous,
Campanian)
|
United States (
Montana)
|
Preserves most of the postcranial skeleton, a rarity for ceratopsids. Remains originally identified as
Avaceratops
|
|
Galeamopus
|
2015
|
Morrison Formation (
Late Jurassic,
Kimmeridgian)
|
United States (
Colorado
Wyoming)
|
One specimen is nearly complete, even preserving an associated skull
|
|
Gargoyleosaurus
|
1998
|
Morrison Formation (
Late Jurassic,
Kimmeridgian to
Tithonian)
|
United States (
Wyoming)
|
Combines features of both ankylosaurids and nodosaurids
|
|
Gastonia
|
1998
|
Cedar Mountain Formation (
Early Cretaceous,
Valanginian)
|
United States (
Utah)
|
Several concentrations of fossils may suggest this taxon lived in herds
[37]
|
|
Geminiraptor
|
2010
|
Cedar Mountain Formation (
Early Cretaceous,
Valanginian)
|
United States (
Utah)
|
The proportions of its maxilla are similar to those of Late Cretaceous troodontids
|
|
Glishades
|
2010
|
Two Medicine Formation (
Late Cretaceous,
Campanian)
|
United States (
Montana
|
Described as a basal hadrosauroid but may in fact be a juvenile saurolophine hadrosaurid
[38]
|
|
Glyptodontopelta
|
2000
|
Ojo Alamo Formation (
Late Cretaceous,
Campanian to
Maastrichtian)
|
United States (
New Mexico)
|
Originally interpreted as possessing a flat mosaic of osteoderms similar to the shields of glyptodonts
|
|
Gojirasaurus
|
1997
|
Dockum Group (
Late Triassic,
Norian)
|
United States (
New Mexico)
|
May be a chimera consisting of undiagnostic theropod bones mixed with pseudosuchian vertebrae
[39]
|
|
Gorgosaurus
|
1914
|
Dinosaur Park Formation,
Judith River Formation?,
Two Medicine Formation? (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
United States (
Montana?)
|
Dozens of specimens are known
|
|
Gravitholus
|
1979
|
Dinosaur Park Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
|
Potentially synonymous with
Stegoceras
[40]
|
|
Gremlin
|
2023
|
Oldman Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
|
Possessed a ridge running along the top of the skull
|
|
Gryphoceratops
|
2012
|
Milk River Formation (
Late Cretaceous,
Santonian)
|
Canada (
Alberta)
|
Potentially the smallest adult ceratopsian known from North America
|
|
Gryposaurus
|
1914
|
Bearpaw Formation?,
Dinosaur Park Formation,
Javelina Formation?,
Kaiparowits Formation,
Two Medicine Formation (
Late Cretaceous,
Santonian to
Maastrichtian)
|
Canada (
Alberta)
United States (
Montana
Texas?
Utah)
|
One specimen preserves impressions of a row of pyramidal scales running along its back
[41]
|
|
Hadrosaurus
|
1858
|
Woodbury Formation (
Late Cretaceous,
Campanian)
|
United States (
New Jersey)
|
Its holotype was the first dinosaur skeleton to be mounted
|
|
Hagryphus
|
2005
|
Kaiparowits Formation (
Late Cretaceous,
Campanian)
|
United States (
Utah)
|
Large but only known from a single hand
|
|
Hanssuesia
|
2003
|
Dinosaur Park Formation,
Judith River Formation,
Oldman Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
United States (
Montana)
|
One dome preserves several lesions
|
|
Haplocanthosaurus
|
1903
|
Morrison Formation (
Late Jurassic,
Kimmeridgian)
|
United States (
Colorado
Montana?
Wyoming)
|
One of the smallest sauropods of the Morrison Formation
|
|
Hesperonychus
|
2009
|
Dinosaur Park Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
|
A common component of its habitat as indicated by the great number of its remains
|
|
Hesperornithoides
|
2019
|
Morrison Formation (
Late Jurassic,
Oxfordian to
Tithonian)
|
United States (
Wyoming)
|
Before its formal description, it had been nicknamed "Lori"
|
|
Hesperosaurus
|
2001
|
Morrison Formation (
Late Jurassic,
Kimmeridgian)
|
United States (
Montana
Wyoming)
|
Two morphotypes of plates are known, which has been interpreted as an indication of
sexual dimorphism
[42]
|
|
Hierosaurus
|
1909
|
Niobrara Formation (
Late Cretaceous,
Coniacian to
Campanian)
|
United States (
Kansas)
|
Only known from a few bones, including osteoderms
|
|
Hippodraco
|
2010
|
Cedar Mountain Formation (
Early Cretaceous,
Valanginian)
|
United States (
Utah)
|
Its tooth crowns were shaped like shields
|
|
Hoplitosaurus
|
1902
|
Lakota Formation (
Early Cretaceous,
Barremian)
|
United States (
South Dakota)
|
Known from some osteoderms, including spikes, similar to those of
Polacanthus
|
|
Huehuecanauhtlus
|
2012
|
Unnamed formation (
Late Cretaceous,
Santonian)
|
Mexico (
Michoacán)
|
The southernmost non-hadrosaurid hadrosauroid known from North America
[43]
|
|
Hypacrosaurus
|
1913
|
Horseshoe Canyon Formation,
Two Medicine Formation (
Late Cretaceous,
Campanian to
Maastrichtian)
|
Canada (
Alberta)
United States (
Montana)
|
Some juveniles of this genus were originally interpreted as dwarf lambeosaurines
|
|
Hypsibema
|
1869
|
Black Creek Group,
Ripley Formation (
Late Cretaceous,
Campanian)
|
United States (
Missouri
North Carolina)
|
Potentially one of the largest non-hadrosaurid hadrosauroids
|
|
Hypsirhophus
|
1878
|
Morrison Formation (
Late Jurassic,
Tithonian)
|
United States (
Colorado)
|
Usually seen as synonymous with
Stegosaurus but may be a separate genus due to differences in its vertebrae
[44]
|
|
Iani
|
2023
|
Cedar Mountain Formation (
Late Cretaceous,
Cenomanian)
|
United States (
Utah)
|
It and possibly
Tenontosaurus represent the only known rhabdodontomorphs from North America
[45]
|
|
Iguanacolossus
|
2010
|
Cedar Mountain Formation (
Early Cretaceous,
Valanginian)
|
United States (
Utah)
|
Large and robustly built
|
|
Invictarx
|
2018
|
Menefee Formation (
Late Cretaceous,
Campanian)
|
United States (
New Mexico)
|
Only known from a few bones but can be distinguished from other genera by characters of its osteoderms
|
|
Issi
|
2021
|
Fleming Fjord Formation (
Late Triassic,
Norian)
|
Greenland (
Sermersooq)
|
Originally described as an exemplar of
Plateosaurus
|
|
Jeyawati
|
2010
|
Moreno Hill Formation (
Late Cretaceous,
Turonian)
|
United States (
New Mexico)
|
Its
postorbital bone had a rugose texture
|
|
Judiceratops
|
2013
|
Judith River Formation (
Late Cretaceous,
Campanian)
|
United States (
Montana)
|
Unusually, its brow horns were teardrop-shaped in cross-section
|
|
Kaatedocus
|
2012
|
Morrison Formation (
Late Jurassic,
Kimmeridgian)
|
United States (
Wyoming)
|
Originally interpreted as a diplodocid although study finds it to be more likely a basal dicraeosaurid
[46]
|
|
Kayentavenator
|
2010
|
Kayenta Formation (
Early Jurassic,
Sinemurian to
Pliensbachian)
|
United States (
Arizona)
|
Described in a book published through an online print-on-demand service
|
|
Koparion
|
1994
|
Morrison Formation (
Late Jurassic,
Kimmeridgian)
|
United States (
Utah)
|
Known from a single tooth which may have come from a troodontid
|
|
Kosmoceratops
|
2010
|
Kaiparowits Formation (
Late Cretaceous,
Campanian)
|
United States (
Utah)
|
Possessed fifteen horns and horn-like structures, including eight hornlets folding down from the top of the frill
|
|
Kritosaurus
|
1910
|
El Picacho Formation?,
Javelina Formation?,
Kirtland Formation,
Ojo Alamo Formation? (
Late Cretaceous,
Campanian)
|
United States (
New Mexico
Texas)
|
Had an elevated nasal bone with an enlarged nasal cavity to match
|
|
Labocania
|
1974
|
La Bocana Roja Formation (
Late Cretaceous,
Campanian)
|
Mexico (
Baja California)
|
Robustly built with particularly strengthened
frontals
|
|
Lambeosaurus
|
1923
|
Dinosaur Park Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
|
Possessed a hollow head crest that varied in shape between species, sexes, and ages. Most familiarly, it was hatchet-shaped in adult male L. lambei
|
|
Laosaurus
|
1878
|
Morrison Formation (
Late Jurassic,
Oxfordian to
Tithonian)
|
United States (
Wyoming)
|
Several referred specimens have been reassigned to other taxa
|
|
Latirhinus
|
2012
|
Cerro del Pueblo Formation (
Late Cretaceous,
Campanian)
|
Mexico (
Coahuila)
|
As described, it represented a chimera composed of lambeosaurine and saurolophine remains;
[47] the exact holotypic bones belonged to a lambeosaurine
[48]
|
|
Lepidus
|
2015
|
Dockum Group (
Late Triassic,
Norian)
|
United States (
Texas)
|
Muscle scars are preserved on the holotype bones
|
|
Leptoceratops
|
1914
|
Hell Creek Formation,
Lance Formation,
Scollard Formation (
Late Cretaceous,
Maastrichtian)
|
Canada (
Alberta)
United States (
Montana
Wyoming)
|
Analysis of its teeth show it could chew like a mammal, an adaptation to eating tough, fibrous plants
[49]
|
|
Leptorhynchos
|
2013
|
Aguja Formation (
Late Cretaceous,
Campanian to
Maastrichtian)
|
United States (
Texas)
|
Had a slightly upturned mandible similar to those of oviraptorids
|
|
Lophorhothon
|
1960
|
Black Creek Formation?,
Mooreville Chalk (
Late Cretaceous,
Campanian)
|
United States (
Alabama
North Carolina?)
|
Although incomplete, the holotype skull preserves evidence of a crest
|
|
Lythronax
|
2013
|
Wahweap Formation (
Late Cretaceous,
Campanian)
|
United States (
Utah)
|
Already had the forward-directed orbits of derived tyrannosaurids despite its early age
|
|
Machairoceratops
|
2016
|
Wahweap Formation (
Late Cretaceous,
Campanian)
|
United States (
Utah)
|
Possessed two long, forward-pointing horns on the top of its frill
|
|
Magnapaulia
|
2012
|
El Gallo Formation (
Late Cretaceous,
Campanian)
|
Mexico (
Baja California)
|
Has been suggested to be semi-aquatic due to its tall, narrow tail
[50]
|
|
Maiasaura
|
1979
|
Oldman Formation,
Two Medicine Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
United States (
Montana)
|
Remains of hundreds of individuals, including juveniles, eggs, and nests, have been found at a single site
[51]
|
|
Malefica
|
2022
|
Aguja Formation (
Late Cretaceous,
Campanian)
|
United States (
Texas)
|
Its discovery suggests a greater diversity of basal hadrosaurids than previously thought
|
|
Maraapunisaurus
|
2018
|
Morrison Formation (
Late Jurassic,
Kimmeridgian)
|
United States (
Colorado)
|
Named from a single, lost vertebra of immense size
|
|
Marshosaurus
|
1976
|
Morrison Formation (
Late Jurassic,
Kimmeridgian)
|
United States (
Colorado?
Utah)
|
Potentially a close relative of South American megalosauroids
[52]
|
|
Martharaptor
|
2012
|
Cedar Mountain Formation (
Early Cretaceous,
Valanginian)
|
United States (
Utah)
|
Had not yet acquired the robust feet of derived therizinosaurs
|
|
Medusaceratops
|
2010
|
Judith River Formation (
Late Cretaceous,
Campanian)
|
United States (
Montana)
|
Possessed elongated spikes curving away from the sides of its frill
|
|
Menefeeceratops
|
2021
|
Menefee Formation (
Late Cretaceous,
Campanian)
|
United States (
New Mexico)
|
One of the oldest centrosaurines
|
|
Mercuriceratops
|
2014
|
Dinosaur Park Formation,
Judith River Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
United States (
Montana)
|
Had "wing"-like projections on its
squamosal bones
|
|
Microvenator
|
1970
|
Cloverly Formation (
Early Cretaceous,
Albian)
|
United States (
Montana)
|
Teeth from
Deinonychus have been mistakenly attributed to this species
|
|
Mierasaurus
|
2017
|
Cedar Mountain Formation (
Early Cretaceous,
Valanginian)
|
United States (
Utah)
|
One of the latest-surviving turiasaurs
[53]
|
|
Moabosaurus
|
2017
|
Cedar Mountain Formation (
Early Cretaceous,
Aptian)
|
United States (
Utah)
|
Described as a macronarian
[54] but has since been reinterpreted as a turiasaur closely related to
Mierasaurus
[53]
|
|
Monoclonius
|
1876
|
Dinosaur Park Formation,
Judith River Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
United States (
Montana)
|
Only known from indistinct remains of juveniles and subadults
|
|
Montanoceratops
|
1951
|
Horseshoe Canyon Formation?,
St. Mary River Formation (
Late Cretaceous,
Maastrichtian)
|
Canada (
Alberta)
United States (
Montana)
|
Often restored with a short nasal horn although this may be a displaced cheek horn
[55]
|
|
Moros
|
2019
|
Cedar Mountain Formation (
Late Cretaceous,
Cenomanian)
|
United States (
Utah)
|
The proportions of its metatarsals are similar to those of ornithomimids
|
|
Mymoorapelta
|
1994
|
Morrison Formation (
Late Jurassic,
Kimmeridgian to
Tithonian)
|
United States (
Colorado
Utah)
|
The first ankylosaur described from the Morrison Formation
|
|
Naashoibitosaurus
|
1993
|
Kirtland Formation (
Late Cretaceous,
Campanian)
|
United States (
New Mexico)
|
Like other kritosaurins, it possessed a nasal arch, but it was not as tall as that of
Gryposaurus
|
|
Nanosaurus
|
1877
|
Morrison Formation (
Late Jurassic,
Oxfordian to
Tithonian)
|
United States (
Colorado
Wyoming)
|
Several referred specimens were originally assigned to other genera
|
|
Nanuqsaurus
|
2014
|
Prince Creek Formation (
Late Cretaceous,
Maastrichtian)
|
United States (
Alaska)
|
Described as a dwarf tyrannosaurid although undescribed remains suggest a size comparable to
Albertosaurus
[56]
|
|
Nasutoceratops
|
2013
|
Kaiparowits Formation (
Late Cretaceous,
Campanian)
|
United States (
Utah)
|
Possessed an enlarged nasal cavity and two long, curving horns similar to those of modern cattle
|
|
Navajoceratops
|
2020
|
Kirtland Formation (
Late Cretaceous,
Campanian)
|
United States (
New Mexico)
|
Had a distinctive notch at the very top of its frill, similar to its potential ancestor
Pentaceratops
[57]
|
|
Nedcolbertia
|
1998
|
Cedar Mountain Formation (
Early Cretaceous,
Valanginian)
|
United States (
Utah)
|
Known from three partial skeletons. The specific name, N. justinhofmanni, honors a six-year-old schoolboy who won a contest to have a dinosaur named after him
|
|
Nevadadromeus
|
2022
|
Willow Tank Formation (
Late Cretaceous,
Cenomanian)
|
United States (
Nevada)
|
The first non-avian dinosaur described from Nevada
|
|
Niobrarasaurus
|
1995
|
Niobrara Formation (
Late Cretaceous,
Coniacian to
Campanian)
|
United States (
Kansas)
|
Originally mistakenly believed to have been aquatic
[58]
|
|
Nodocephalosaurus
|
1999
|
Kirtland Formation (
Late Cretaceous,
Campanian to
Maastrichtian)
|
United States (
New Mexico)
|
Closely related to Asian ankylosaurs
[59]
|
|
Nodosaurus
|
1889
|
Frontier Formation (
Late Cretaceous,
Cenomanian to
Coniacian)
|
United States (
Wyoming)
|
Its armor included banded dermal plates interspersed by bony nodules
|
|
Nothronychus
|
2001
|
Moreno Hill Formation,
Tropic Shale (
Late Cretaceous,
Turonian)
|
United States (
New Mexico
Utah)
|
Would have lived in the marshes and swamps
[60] along the Turonian shoreline
[61]
|
|
Ojoraptorsaurus
|
2011
|
Ojo Alamo Formation (
Late Cretaceous,
Maastrichtian)
|
United States (
New Mexico)
|
Only known from an incomplete pair of
pubes
|
|
Oohkotokia
|
2013
|
Two Medicine Formation (
Late Cretaceous,
Campanian)
|
United States (
Montana)
|
Potentially a synonym of
Scolosaurus
[62]
|
|
Ornatops
|
2021
|
Menefee Formation (
Late Cretaceous,
Campanian)
|
United States (
New Mexico)
|
Preserves a pair of bumps on its skull which may have anchored a crest
|
|
Ornitholestes
|
1903
|
Morrison Formation (
Late Jurassic,
Kimmeridgian)
|
United States (
Wyoming)
|
May have possessed a sickle claw similar to those of dromaeosaurids
[63]
|
|
Ornithomimus
|
1890
|
Denver Formation,
Dinosaur Park Formation,
Ferris Formation?,
Horseshoe Canyon Formation,
Kaiparowits Formation? (
Late Cretaceous,
Campanian to
Maastrichtian)
|
Canada (
Alberta)
United States (
Colorado
Utah?
Wyoming)
|
One referred specimen preserves impressions of ostrich-like feathers covering most of its body
[64]
|
|
Orodromeus
|
1988
|
Two Medicine Formation (
Late Cretaceous,
Campanian)
|
United States (
Montana)
|
Eggs considered to belong to this taxon may have actually come from a troodontid
[65]
|
|
Oryctodromeus
|
2007
|
Blackleaf Formation,
Wayan Formation (
Late Cretaceous,
Cenomanian)
|
United States (
Idaho
Montana)
|
Several specimens have been preserved in burrows
|
|
Osmakasaurus
|
2011
|
Lakota Formation (
Early Cretaceous,
Valanginian)
|
United States (
South Dakota)
|
Originally named as a species of
Camptosaurus
|
|
Pachycephalosaurus
|
1943
|
Hell Creek Formation,
Lance Formation,
Scollard Formation? (
Late Cretaceous,
Maastrichtian)
|
Canada (
Alberta?)
United States (
Montana
South Dakota
Wyoming)
|
Possessed a tall, rounded head dome surrounded by bony knobs
|
|
Pachyrhinosaurus
|
1950
|
Horseshoe Canyon Formation,
Prince Creek Formation,
St. Mary River Formation,
Wapiti Formation (
Late Cretaceous,
Campanian to
Maastrichtian)
|
Canada (
Alberta)
United States (
Alaska)
|
Three species have been named, each with a unique pattern of cranial ornamentation
|
|
Palaeoscincus
|
1856
|
Judith River Formation (
Late Cretaceous,
Campanian)
|
United States (
Montana)
|
Although many restorations depict it with the spikes of
Edmontonia and the tail club of
Ankylosaurus, this is most likely incorrect
|
|
Panoplosaurus
|
1919
|
Dinosaur Park Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
|
Unlike other nodosaurs, it lacked enlarged spikes
|
|
Parasaurolophus
|
1922
|
Dinosaur Park Formation,
Fruitland Formation,
Kaiparowits Formation,
Kirtland Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
United States (
New Mexico
Utah)
|
Possessed a curved, hollow crest that varied in size between species
|
|
Paraxenisaurus
|
2020
|
Cerro del Pueblo Formation (
Late Cretaceous,
Campanian)
|
Mexico (
Coahuila)
|
Described as the first deinocheirid from North America
|
|
Parksosaurus
|
1937
|
Horseshoe Canyon Formation (
Late Cretaceous,
Maastrichtian)
|
Canada (
Alberta)
|
Had long toes which may be an adaptation to walking on soft soils in watercourses and marshlands
[60]
|
|
Paronychodon
|
1876
|
Hell Creek Formation,
Judith River Formation,
Lance Formation (
Late Cretaceous,
Campanian to
Maastrichtian)
|
United States (
Montana
North Dakota
South Dakota
Wyoming)
|
Only known from highly distinctive teeth
|
|
Pawpawsaurus
|
1996
|
Paw Paw Formation (
Early Cretaceous to
Late Cretaceous,
Albian to
Cenomanian)
|
United States (
Texas)
|
Had enlarged nasal cavities that gave it an acute sense of smell, even more powerful than that of contemporary theropods
[66]
|
|
Pectinodon
|
1982
|
Hell Creek Formation,
Lance Formation (
Late Cretaceous,
Maastrichtian)
|
United States (
Wyoming)
|
Had comb-like serrations on its teeth
|
|
Peloroplites
|
2008
|
Cedar Mountain Formation (
Late Cretaceous,
Cenomanian to
Turonian)
|
United States (
Utah)
|
One of the largest known nodosaurids
|
|
Pentaceratops
|
1923
|
Fruitland Formation,
Kirtland Formation (
Late Cretaceous,
Campanian)
|
United States (
New Mexico)
|
Its epijugal bones (the hornlets under its eyes) were relatively large
|
|
Planicoxa
|
2001
|
Cedar Mountain Formation (
Early Cretaceous,
Hauterivian to
Albian)
|
United States (
Utah)
|
The rear of its ilium was characteristically flat
|
|
Platypelta
|
2018
|
Dinosaur Park Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
|
Originally assigned to
Euoplocephalus but given its own genus because of several morphological differences
|
|
Platytholus
|
2023
|
Hell Creek Formation (
Late Cretaceous,
Maastrichtian)
|
United States (
Montana)
|
Differs from juveniles of the contemporary
Pachycephalosaurus and
Sphaerotholus, hence its separation as a new genus
|
|
Podokesaurus
|
1911
|
Portland Formation (
Early Jurassic,
Hettangian to
Sinemurian)
|
United States (
Massachusetts)
|
May have had a tail one and a half times longer than the rest of its skeleton
[67]
|
|
Polyodontosaurus
|
1932
|
Dinosaur Park Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
|
May be identical to
Latenivenatrix
[68]
|
|
Polyonax
|
1874
|
Denver Formation (
Late Cretaceous,
Maastrichtian)
|
United States (
Colorado)
|
Poorly known
|
|
Prenoceratops
|
2004
|
Oldman Formation,
Two Medicine Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
United States (
Montana)
|
The only basal ceratopsian known from a bonebed
|
|
Priconodon
|
1888
|
Arundel Formation (
Early Cretaceous,
Aptian to
Albian)
|
United States (
Maryland)
|
Large but only known from teeth
|
|
Probrachylophosaurus
|
2015
|
Foremost Formation,
Judith River Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
United States (
Montana)
|
Shows a skull morphology transitional between crestless and crested brachylophosaurins
|
|
Propanoplosaurus
|
2011
|
Patuxent Formation (
Early Cretaceous,
Aptian)
|
United States (
Maryland)
|
Only known from the imprints of a neonate skeleton
|
|
Prosaurolophus
|
1916
|
Dinosaur Park Formation,
Two Medicine Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
United States (
Montana)
|
Had a relatively large head for a hadrosaur
|
|
Protohadros
|
1998
|
Woodbine Formation (
Late Cretaceous,
Cenomanian)
|
United States (
Texas)
|
Possessed a downturned jaw which may be an adaptation to grazing on low-growing plants
|
|
Pteropelyx
|
1889
|
Judith River Formation (
Late Cretaceous,
Campanian)
|
United States (
Montana)
|
Potentially synonymous with
Corythosaurus, although this cannot be confirmed due to a lack of cranial remains
[69]
|
|
Rativates
|
2016
|
Dinosaur Park Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
|
Originally described as a specimen of
Struthiomimus
|
|
Regaliceratops
|
2015
|
St. Mary River Formation (
Late Cretaceous,
Maastrichtian)
|
Canada (
Alberta)
|
Possessed a series of large, pentagonal plates lining its frill
|
|
Richardoestesia
|
1990
|
Aguja Formation,
Dinosaur Park Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
United States (
Texas)
|
Teeth assigned to this genus have been recovered all around the world, in deposits spanning millions of years of time, although they may not represent a single taxon
|
|
Rugocaudia
|
2012
|
Cloverly Formation (
Early Cretaceous,
Aptian to
Albian)
|
United States (
Montana)
|
Some of this genus' remains include several caudal vertebrae
|
|
Sarahsaurus
|
2011
|
Kayenta Formation (
Early Jurassic,
Sinemurian to
Pliensbachian)
|
United States (
Arizona)
|
Possessed strong hands which may indicate a feeding specialization
|
|
Saurolophus
|
1912
|
Horseshoe Canyon Formation (
Late Cretaceous,
Maastrichtian)
|
Canada (
Alberta)
|
Had a short, solid crest that pointed directly upwards. A larger, more well-known species has been found in Mongolia
|
|
Sauropelta
|
1970
|
Cedar Mountain Formation?,
Cloverly Formation (
Early Cretaceous,
Albian)
|
United States (
Montana
Utah?
Wyoming)
|
Its tail had at least forty vertebrae, making up half of its total body length
|
|
Saurophaganax
|
1995
|
Morrison Formation (
Late Jurassic,
Kimmeridgian to
Tithonian)
|
United States (
New Mexico?
Oklahoma)
|
Potentially an extremely large specimen of
Allosaurus
[70]
|
|
Sauroposeidon
|
2000
|
Antlers Formation,
Glen Rose Formation (
Early Cretaceous,
Aptian to
Albian)
|
United States (
Oklahoma
Texas
Wyoming)
|
Could raise its head up to 18 metres (59 ft) in the air, the height of a six-storey building
[71]
|
|
Saurornitholestes
|
1978
|
Coachman Formation,
Dinosaur Park Formation,
Donoho Creek Formation,
Kirtland Formation,
Mooreville Chalk,
Oldman Formation,
Tar Heel Formation,
Two Medicine Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta (
United States (
Alabama
Montana
New Mexico
North Carolina
South Carolina)
|
Its second premaxillary teeth could be adapted to preening feathers
[72]
|
|
Scolosaurus
|
1928
|
Dinosaur Park Formation,
Oldman Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
|
Once widely believed to be synonymous with other Campanian ankylosaurids
|
|
Scutellosaurus
|
1981
|
Kayenta Formation (
Early Jurassic,
Sinemurian)
|
United States (
Arizona)
|
Had hundreds of osteoderms arranged in rows along its back and tail
|
|
Segisaurus
|
1936
|
Navajo Sandstone (
Early Jurassic,
Pliensbachian to
Toarcian)
|
United States (
Arizona)
|
Preserves evidence of a
wishbone similar to that of modern birds
|
|
Seitaad
|
2010
|
Navajo Sandstone (
Early Jurassic,
Pliensbachian)
|
United States (
Utah)
|
The holotype may have died when a sand dune collapsed on it
[73]
|
|
Siats
|
2013
|
Cedar Mountain Formation (
Late Cretaceous,
Cenomanian)
|
United States (
Utah)
|
Large but inconsistent in phylogenetic placement
|
|
Sierraceratops
|
2022
|
Hall Lake Formation (
Late Cretaceous,
Campanian to
Maastrichtian)
|
United States (
New Mexico)
|
May be part of a unique clade of ceratopsians only known from southern Laramidia
[74]
|
|
Silvisaurus
|
1960
|
Dakota Formation (
Early Cretaceous to
Late Cretaceous,
Albian to
Cenomanian)
|
United States (
Kansas)
|
Hypothesized to live in a forested habitat
|
|
Smitanosaurus
|
2020
|
Morrison Formation (
Late Jurassic,
Oxfordian to
Tithonian)
|
United States (
Colorado)
|
Only known from a partial skull and some vertebrae
|
|
Sonorasaurus
|
1998
|
Turney Ranch Formation (
Early Cretaceous to
Late Cretaceous,
Albian to
Cenomanian)
|
United States (
Arizona)
|
State dinosaur of Arizona
|
|
Sphaerotholus
|
2002
|
Dinosaur Park Formation,
Frenchman Formation,
Hell Creek Formation,
Horseshoe Canyon Formation,
Kirtland Formation (
Late Cretaceous,
Campanian to
Maastrichtian)
|
Canada (
Alberta
Saskatchewan)
United States (
Montana
New Mexico)
|
Five species have been named, all known from skull elements. Lived in a broad range
|
|
Spiclypeus
|
2016
|
Judith River Formation (
Late Cretaceous,
Campanian)
|
United States (
Montana)
|
Has been described as "boldly audacious"
[75]
|
|
Spinops
|
2011
|
Dinosaur Park Formation?/
Oldman Formation? (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
|
Described almost a century after its remains were collected
|
|
Stegoceras
|
1902
|
Dinosaur Park Formation,
Fruitland Formation?,
Kirtland Formation?,
Oldman Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
United States (
New Mexico?)
|
May have been an indiscriminate bulk-feeder due to the shape of its snout
[76]
|
|
Stegopelta
|
1905
|
Frontier Formation (
Early Cretaceous to
Late Cretaceous,
Albian to
Cenomanian)
|
United States (
Wyoming)
|
May have possessed a sacral shield similar to other nodosaurs
|
|
Stegosaurus
|
1877
|
Morrison Formation (
Late Jurassic,
Kimmeridgian to
Tithonian)
|
United States (
Colorado
Wyoming)
|
Had a single alternating row of large, kite-shaped plates
|
|
Stellasaurus
|
2020
|
Two Medicine Formation (
Late Cretaceous,
Campanian)
|
United States (
Montana)
|
Possessed an enlarged, thickened nasal horn
|
|
Stenonychosaurus
|
1932
|
Dinosaur Park Formation,
Two Medicine Formation? (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
United States (
Montana?)
|
Its brain-to-body mass ratio is one of the highest of any non-avian dinosaur's
|
|
Stephanosaurus
|
1914
|
Dinosaur Park Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
|
Poorly known
|
|
Stokesosaurus
|
1974
|
Morrison Formation (
Late Jurassic,
Kimmeridgian to
Tithonian)
|
United States (
South Dakota?
Utah)
|
Only known from a few remains but they are enough to tell that it was a tyrannosauroid
|
|
Struthiomimus
|
1917
|
Horseshoe Canyon Formation?,
Lance Formation?,
Oldman Formation (
Late Cretaceous,
Campanian to
Maastrichtian)
|
Canada (
Alberta)
United States (
Wyoming?)
|
Known from many specimens, indicating it was a common animal
|
|
Styracosaurus
|
1913
|
Dinosaur Park Formation,
Two Medicine Formation? (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
United States (
Montana)?
|
Possessed several long horns jutting out from the top of its frill, the patterns of which could have varied between individuals
[77]
|
|
Supersaurus
|
1985
|
Morrison Formation (
Late Jurassic,
Tithonian)
|
United States (
Colorado
Wyoming)
|
Several remains were originally believed to represent their own genera
|
|
Suskityrannus
|
2019
|
Moreno Hill Formation (
Late Cretaceous,
Turonian)
|
United States (
New Mexico)
|
Small yet already possessed several features of large, derived tyrannosaurids, including an arctometatarsus
|
|
Suuwassea
|
2004
|
Morrison Formation (
Late Jurassic,
Oxfordian to
Tithonian)
|
United States (
Montana)
|
Shares features with both diplodocids and dicraeosaurids, but is more likely a member of the latter group
[14]
[46]
|
|
Talos
|
2011
|
Kaiparowits Formation (
Late Cretaceous,
Campanian)
|
United States (
Utah)
|
The holotype specimen preserves a pathology on its sickle claw
[78]
|
|
Tanycolagreus
|
2005
|
Morrison Formation (
Late Jurassic,
Oxfordian to
Tithonian)
|
United States (
Colorado
Utah
Wyoming)
|
Had a long, blunt snout
|
|
Tatankacephalus
|
2009
|
Cloverly Formation (
Early Cretaceous,
Aptian to
Albian)
|
United States (
Montana)
|
Retained premaxillary teeth in its upper jaws, a basal trait
|
|
Tawa
|
2009
|
Chinle Formation (
Late Triassic,
Norian)
|
United States (
New Mexico)
|
Well-preserved but inconsistent in phylogenetic placement
|
|
Tenontosaurus
|
1970
|
Antlers Formation,
Arundel Formation,
Cedar Mountain Formation,
Cloverly Formation,
Paluxy Formation,
Twin Mountains Formation,
Wayan Formation (
Early Cretaceous,
Aptian to
Albian)
|
United States (
Idaho
Maryland
Montana
Oklahoma
Texas
Utah)
|
Remains of this genus are often found associated with skeletons of
Deinonychus
[79]
|
|
Teratophoneus
|
2011
|
Kaiparowits Formation (
Late Cretaceous,
Campanian)
|
United States (
Utah)
|
Its snout was shorter and deeper than those of other tyrannosaurids
|
|
Terminocavus
|
2020
|
Kirtland Formation (
Late Cretaceous,
Campanian)
|
United States (
New Mexico)
|
Had a teardrop-shaped hole on the top of its frill which was almost closed off by a pair of epoccipitals
|
|
Texacephale
|
2010
|
Aguja Formation (
Late Cretaceous,
Campanian)
|
United States (
Texas)
|
Possessed a series of vertical flanges on its dome which may have functioned as "gears" that interlocked when head-butting
|
|
Texasetes
|
1995
|
Paw Paw Formation (
Early Cretaceous,
Albian)
|
United States (
Texas)
|
Potentially synonymous with
Pawpawsaurus
|
|
Thanatotheristes
|
2020
|
Foremost Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
|
A close relative of
Daspletosaurus
[80]
|
|
Theiophytalia
|
2006
|
Purgatoire Formation (
Early Cretaceous,
Aptian to
Albian)
|
United States (
Colorado)
|
Only known from a skull originally referred to
Camptosaurus
|
|
Thescelosaurus
|
1913
|
Frenchman Formation,
Hell Creek Formation,
Lance Formation,
Laramie Formation,
Scollard Formation (
Late Cretaceous,
Maastrichtian)
|
Canada (
Alberta
Saskatchewan)
United States (
Colorado
Montana
North Dakota
South Dakota
Wyoming)
|
One specimen was originally considered to have preserved its heart, although later this was found to be a mineral concretion
[81]
|
|
Thespesius
|
1856
|
Lance Formation (
Late Cretaceous,
Maastrichtian)
|
United States (
South Dakota)
|
Once suggested to be a possible Miocene mammal
|
|
Tichosteus
|
1877
|
Morrison Formation (
Late Jurassic,
Kimmeridgian)
|
United States (
Colorado)
|
Two species have been named, both from isolated vertebrae
|
|
Titanoceratops
|
2011
|
Fruitland Formation?/
Kirtland Formation? (
Late Cretaceous,
Campanian)
|
United States (
New Mexico)
|
Potentially a large, old specimen of
Pentaceratops
[57]
|
|
Tlatolophus
|
2021
|
Cerro del Pueblo Formation (
Late Cretaceous,
Campanian)
|
Mexico (
Coahuila)
|
Possessed a short, broad crest resembling an inverted comma
|
|
Torosaurus
|
1891
|
Frenchman Formation,
Hell Creek Formation,
Lance Formation,
Scollard Formation (
Late Cretaceous,
Maastrichtian)
|
Canada (
Alberta
Saskatchewan)
United States (
Colorado?
Montana?
New Mexico?
North Dakota?
South Dakota
Texas?
Utah?
Wyoming)
|
Once believed to be potentially synonymous with
Triceratops
|
|
Torvosaurus
|
1979
|
Morrison Formation (
Middle Jurassic to
Late Jurassic,
Callovian to
Tithonian)
|
United States (
Colorado
Wyoming)
|
Had short but powerfully built arms. Several species, many of them unnamed, have been found in Europe, South America, and possibly Africa
|
|
Tototlmimus
|
2016
|
Packard Formation (
Late Cretaceous,
Campanian)
|
Mexico (
Sonora)
|
The southernmost ornithomimid known from North America
|
|
Trachodon
|
1856
|
Judith River Formation (
Late Cretaceous,
Campanian)
|
United States (
Montana)
|
Several remains assigned to this genus actually belong to other taxa, most notably
Edmontosaurus
|
|
Triceratops
|
1889
|
Denver Formation,
Evanston Formation,
Hell Creek Formation,
Lance Formation,
Laramie Formation,
Scollard Formation (
Late Cretaceous,
Maastrichtian)
|
Canada (
Alberta
Saskatchewan?)
United States (
Colorado
Montana
South Dakota
Wyoming)
|
A common ceratopsid with long brow horns and a short nasal horn
|
|
Trierarchuncus
|
2020
|
Hell Creek Formation (
Late Cretaceous,
Maastrichtian)
|
United States (
Montana)
|
Known from remains of different sizes which depict how the claws of alvarezsaurids grew more hooked as they aged
|
|
Troodon
|
1856
|
Judith River Formation,
Two Medicine Formation? (
Late Cretaceous,
Campanian)
|
United States (
Montana)
|
Only known from teeth. Most referred skeletal remains cannot be confidently assigned to this genus
[68]
|
|
Tyrannosaurus
|
1905
|
Frenchman Formation,
Hall Lake Formation,
Hell Creek Formation,
Lance Formation,
Willow Creek Formation (
Late Cretaceous,
Campanian to
Maastrichtian)
|
Canada (
Alberta
Saskatchewan)
United States (
Colorado
Montana
New Mexico
South Dakota
Wyoming)
|
The last, largest, and most well-known tyrannosaurid
|
|
Unescoceratops
|
2012
|
Dinosaur Park Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
|
Had the roundest teeth of any known leptoceratopsid
|
|
Utahceratops
|
2010
|
Kaiparowits Formation (
Late Cretaceous,
Campanian)
|
United States (
Utah)
|
Almost the entire skeleton and skull is known
|
|
Utahraptor
|
1993
|
Cedar Mountain Formation (
Early Cretaceous,
Valanginian to
Hauterivian)
|
United States (
Utah)
|
Very large and powerfully built
|
|
Uteodon
|
2011
|
Morrison Formation (
Late Jurassic,
Tithonian)
|
United States (
Utah)
|
May be a species of
Camptosaurus, with a referred braincase being from
Dryosaurus
[82]
|
|
Vagaceratops
|
2010
|
Dinosaur Park Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta
|
Possessed a row of fused epoccipitals folding over the top of the frill
|
|
Velafrons
|
2007
|
Cerro del Pueblo Formation (
Late Cretaceous,
Campanian)
|
Mexico (
Coahuila)
|
May have had elongated neural spines similar to those of
Hypacrosaurus altispinus
|
|
Venenosaurus
|
2001
|
Cedar Mountain Formation (
Early Cretaceous,
Aptian to
Albian)
|
United States (
Utah)
|
Its skeleton has traits of both titanosaurs and more basal macronarians
|
|
Wendiceratops
|
2015
|
Oldman Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
|
Had three pairs of enlarged, curved epiparietals at the very top of its frill
|
|
Xenoceratops
|
2012
|
Foremost Formation (
Late Cretaceous,
Campanian)
|
Canada (
Alberta)
|
Possessed two long spines at the top of its frill with smaller knobs at their bases
|
|
Yehuecauhceratops
|
2017
|
Aguja Formation (
Late Cretaceous,
Campanian)
|
Mexico (
Coahuila)
|
One of the smallest known ceratopsids
|
|
Yurgovuchia
|
2012
|
Cedar Mountain Formation (
Early Cretaceous,
Valanginian)
|
United States (
Utah)
|
May have had a flexible tail due to the structure of its caudal vertebrae
|
|
Zapsalis
|
1876
|
Judith River Formation (
Late Cretaceous,
Campanian)
|
United States (
Montana)
|
Some teeth referred to this genus actually belong to
Saurornitholestes
[72]
|
|
Zephyrosaurus
|
1980
|
Cloverly Formation (
Early Cretaceous,
Aptian to
Albian)
|
United States (
Montana)
|
Currently only known from fragmentary remains but several undescribed specimens exist
[83]
|
|
Ziapelta
|
2014
|
Kirtland Formation (
Late Cretaceous,
Campanian)
|
United States (
New Mexico)
|
Many specimens are known, most from the front part of the animal
|
|
Zuniceratops
|
1998
|
Moreno Hill Formation (
Late Cretaceous,
Turonian)
|
United States (
New Mexico)
|
Carried a pair of brow horns despite not being a member of the Ceratopsidae
|
|
Zuul
|
2017
|
Judith River Formation (
Late Cretaceous,
Campanian)
|
United States (
Montana)
|
Preserves several osteoderms, keratin, and skin remains
|
|