PBDB Taxon

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Arrhinoceratops

Reptilia - Ceratopsidae

Taxonomy

Arrhinoceratops was named by Parks (1925).

It was assigned to Ceratopsia by Parks (1925); to Ceratopsinae by Nopcsa (1928), Huene (1950) and Tatarinov (1964); to Ceratopinae by Olshevsky and Ford (1994); to Ceratopsidae by Huene (1927), Hay (1930), Russell (1930), Lull (1933), Parks (1935), Gilmore (1946), Sternberg (1949), Romer (1956), Parsch (1963), Kuhn (1964), Romer (1966), Russell and Chamney (1967), Swinton (1970), Madsen and Miller (1979), Tyson (1981), Russell (1984), Ostrom and Wellnhofer (1986), Carroll (1988) and Eberth (1997); and to Chasmosaurinae by Dodson and Currie (1990), Lehman (1990), Lehman (1996), Dodson (1997), Dodson et al. (2004), Farke (2004), Diem and Archibald (2005), Wu et al. (2007), Ryan (2007), Hunt and Lehman (2008), Longrich (2010), Xu et al. (2010), Farke (2011), Longrich (2014) and Mallon et al. (2014).

Species

A. brachyops

Synonymy list

Year	Name and author
1925	Arrhinoceratops Parks pp. 5-7 figs. 1-2
1927	Arrhinoceratops Huene p. 261
1928	Arrhinoceratops Nopcsa p. 185
1930	Arrhinoceratops Hay p. 221
1930	Arrhinoceratops Russell p. 151
1933	Arrhinoceratops Lull p. 106
1935	Arrhinoceratops Parks p. 194
1946	Arrhinoceratops Gilmore p. 42
1949	Arrhinoceratops Sternberg p. 44 fig. 1
1950	Arrhinoceratops Huene p. 351
1956	Arrhinoceratops Romer p. 638
1963	Arrhinoceratops Parsch p. 8
1964	Arrhinoceratops Kuhn p. 55
1964	Arrhinoceratops Tatarinov p. 585
1966	Arrhinoceratops Romer p. 371
1967	Arrhinoceratops Russell and Chamney p. 11
1970	Arrhinoceratops Swinton p. 259
1979	Arrhinoceratops Madsen and Miller p. 5
1981	Arrhinoceratops Tyson p. 1245
1984	Arrhinoceratops Russell p. 26
1986	Arrhinoceratops Ostrom and Wellnhofer p. 116
1988	Arrhinoceratops Carroll
1990	Arrhinoceratops Dodson and Currie p. 612
1990	Arrhinoceratops Lehman p. 212
1994	Arrhinoceratops Olshevsky and Ford
1996	Arrhinoceratops Lehman p. 505 fig. 10
1997	Arrhinoceratops Dodson p. 474
1997	Arrhinoceratops Eberth p. 201
2004	Arrhinoceratops Dodson et al. p. 495
2004	Arrhinoceratops Farke p. 4
2005	Arrhinoceratops Diem and Archibald p. 251
2007	Arrhinoceratops Ryan p. 391 fig. 12
2007	Arrhinoceratops Wu et al. p. 1261 fig. 14
2008	Arrhinoceratops Hunt and Lehman p. 1132
2010	Arrhinoceratops Longrich p. 692 fig. 10
2010	Arrhinoceratops Xu et al. p. 1634 fig. 3
2011	Arrhinoceratops Farke p. 6
2014	Arrhinoceratops Longrich p. 303 fig. 8
2014	Arrhinoceratops Mallon et al.

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Deuterostomia
phylum	Chordata	Haeckel 1874
subphylum	Vertebrata
superclass	Gnathostomata
—	Osteichthyes	()
subclass	Sarcopterygii	()
subclass	Dipnotetrapodomorpha	(Nelson 2006)
subclass	Tetrapodomorpha	()
—	Tetrapoda
—	Reptiliomorpha
—	Anthracosauria
subclass	Amphibiosauria	Kuhn 1967
—	Cotylosauria	()
—	Amniota
—	Sauropsida
class	Reptilia
subclass	Eureptilia	()
—	Romeriida
—	Diapsida	()

Rank	Name	Author
—	Archosauromorpha	(Huene 1946)
—	Crocopoda
—	Archosauriformes	Gauthier 1986
—	Eucrocopoda
—	Archosauria	()
informal	Avemetatarsalia
—	Ornithodira
—	Dinosauromorpha
—	Dinosauriformes
—	Dinosauria	()
—	Ornithischia	()
—	Genasauria
—	Cerapoda
—	Marginocephalia
—	Ceratopsia	()
infraorder	Neoceratopsia
—	Coronosauria
superfamily	Ceratopsoidea
family	Ceratopsidae
subfamily	Chasmosaurinae
genus	Arrhinoceratops

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

G. †Arrhinoceratops Parks 1925

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†Arrhinoceratops brachyops Parks 1925

Diagnosis

Reference	Diagnosis
W. A. Parks 1925	Supraorbital horn cores large, directed outwards and forward; nasal horn core absent; facial region short; crest relatively large, subquadrate, flat; squamosals long; parietals with oval fontanelles of moderate size; anterior process of jugal unusually long.
H. Tyson 1981	As for the type and only species.

Measurements

No measurements are available

Composition:

hydroxyapatiteo

Entire body:

yeso

Adult length:

10 to < 100o

Adult width:

1.0 to < 10o

Adult height:

1.0 to < 10o

Architecture:

compact or denseo

Ontogeny:

accretion, modification of partso

Grouping:

gregariouso

Environment:

terrestrialsubo

Locomotion:

actively mobileo

Life habit:

ground dwellingsubo

Diet:

herbivoresubo

Reproduction:

oviparouso

Dispersal:

direct/internalo

Dispersal 2:

mobileo

Created:

2005-09-15 11:08:09

Modified:

2005-09-15 13:08:09

Source: subo = suborder, o = order

References: Norman and Weishampel 1991, Marsh 1875

Age range: base of the Late/Upper Campanian to the top of the Early/Lower Maastrichtian or 83.50000 to 66.00000 Ma

Collections (3 total)

Time interval	Ma	Country or state	Original ID and collection number
Late/Upper Campanian	83.5 - 70.6	Canada (Alberta)	A. sp. (152403)
Late/Upper Campanian - Early/Lower Maastrichtian	83.5 - 66.0	Canada (Alberta)	A. brachyops (67612)
Early/Lower Maastrichtian	70.6 - 66.0	Canada (Alberta)	A. brachyops (156799)