PBDB Taxon

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Hypacrosaurus

Reptilia - Hadrosauridae

Taxonomy

Hypacrosaurus was named by Brown (1913).

It was assigned to Saurolophinae by Brown (1914) and Lambe (1918); to Stephanosaurinae by Lambe (1920); to Trachodontidae by Brown (1913), Brown (1914), Gilmore (1917), Huene (1927) and Parks (1935); to Lambeosauridae by Horner and Currie (1994); to Hadrosauridae by Lambe (1917), Russell (1930), Romer (1956), Parsch (1963), Kuhn (1964), Romer (1966), Swinton (1970), Haubold (1971), Thulborn (1974), Russell (1984), Eberth (1997), Currie (2000) and Eberth et al. (2001); to Lambeosaurini by Sullivan et al. (2011) and Prieto-Marquez et al. (2013); to Corythosaurini by Evans et al. (2007), Evans and Reisz (2007), Godefroit et al. (2008), Pereda-Suberbiola et al. (2009), Cruzado-Caballero et al. (2010), Godefroit et al. (2012), Cruzado-Caballero et al. (2013) and Bolotsky et al. (2014); and to Lambeosaurinae by Gilmore (1924), Nopcsa (1928), Hay (1930), Gilmore (1933), Parks (1935), Nagao (1936), Riabinin (1939), Wilfarth (1940), Lull and Wright (1942), Sternberg (1953), Sternberg (1954), Langston (1960), Tatarinov (1964), Russell and Chamney (1967), Rozhdestvensky (1968), Hopson (1975), Brett-Surman (1979), Weishampel and Weishampel (1983), Brinkmann (1984), Maryanska and Osmólska (1984), Powell (1987), Weishampel and Horner (1990), Chapman and Brett-Surman (1990), Forster and Sereno (1994), Vickaryous and Ryan (1997), Dodson (1997), Godefroit et al. (1998), Godefroit et al. (2003), Horner et al. (2004), Godefroit et al. (2004), Lund and Gates (2006), Prieto-Márquez et al. (2006), Mo et al. (2007), Guenther (2009), Evans et al. (2009), Prieto-Márquez (2010), Evans (2010), Prieto-Márquez (2010), Prieto-Marquez and Salinas (2010), Prieto-Márquez and Wagner (2010), Reisz et al. (2010), Ramírez-Velasco et al. (2012), Bailleul et al. (2013), Brink et al. (2014), Lehman et al. (2016), Cruzado-Caballero and Powell (2017) and Takasaki et al. (2019).

Species

H. altispinus (syn. Cheneosaurus tolmanensis), H. stebingeri

Synonyms

Cheneosaurus was named by Lambe (1917).

It was synonymized subjectively with Hypacrosaurus by Hopson (1975), Brett-Surman (1979) and Horner et al. (2004).

It was assigned to Stephanosaurinae by Lambe (1920); to Trachodontidae by Lambe (1917), Abel (1924) and Huene (1927); to Cheneosaurinae by Lull and Wright (1942); to Saurolophinae by Lambe (1918), Hay (1930) and Kuhn (1966); to Lambeosaurinae by Parks (1923), Gilmore (1924), Nopcsa (1928), Gilmore (1933), Nagao (1936), Sternberg (1936), Riabinin (1939), Wilfarth (1940), Sternberg (1953), Sternberg (1953), Sternberg (1954), Langston (1960), Tatarinov (1964), Russell and Chamney (1967) and Rozhdestvensky (1968); and to Hadrosauridae by Lambe (1917), Russell (1930), Romer (1956), Parsch (1963), Kuhn (1964), Romer (1966), Swinton (1970), Thulborn (1974) and Carroll (1988).

Synonymy list

Year	Name and author
1913	Hypacrosaurus Brown
1914	Hypacrosaurus Brown p. 377
1917	Hypacrosaurus Gilmore p. 38
1917	Cheneosaurus Lambe p. 65
1917	Hypacrosaurus Lambe pp. 66-67
1917	Cheneosaurus Lambe pp. 117-118
1918	Cheneosaurus Lambe p. 138
1918	Hypacrosaurus Lambe p. 138
1920	Cheneosaurus Lambe pp. 67-68
1920	Hypacrosaurus Lambe pp. 67-68
1923	Cheneosaurus Parks p. 8
1924	Cheneosaurus Abel p. 714
1924	Cheneosaurus Gilmore p. 34
1924	Hypacrosaurus Gilmore p. 34
1927	Cheneosaurus Huene p. 260
1927	Hypacrosaurus Huene p. 260
1928	Cheneosaurus Nopcsa p. 185
1928	Hypacrosaurus Nopcsa p. 185
1930	Cheneosaurus Hay p. 217
1930	Hypacrosaurus Hay p. 217
1930	Hypacrosaurus Russell p. 146
1930	Cheneosaurus Russell p. 151
1933	Cheneosaurus Gilmore p. 62
1933	Hypacrosaurus Gilmore p. 62
1935	Hypacrosaurus Parks p. 21
1936	Cheneosaurus Nagao p. 213
1936	Hypacrosaurus Nagao p. 213
1936	Cheneosaurus Sternberg p. 654
1939	Cheneosaurus Riabinin p. 12
1939	Hypacrosaurus Riabinin p. 15
1940	Cheneosaurus Wilfarth p. 12
1940	Hypacrosaurus Wilfarth p. 13
1942	Cheneosaurus Lull and Wright p. 133
1942	Hypacrosaurus Lull and Wright p. 133
1953	Cheneosaurus Sternberg p. 11
1953	Hypacrosaurus Sternberg p. 11
1953	Cheneosaurus Sternberg p. 1478
1954	Cheneosaurus Sternberg p. 383
1954	Hypacrosaurus Sternberg p. 383
1956	Cheneosaurus Romer p. 630
1956	Hypacrosaurus Romer p. 630
1960	Hypacrosaurus Langston p. 336
1960	Cheneosaurus Langston p. 349
1963	Cheneosaurus Parsch p. 8
1963	Hypacrosaurus Parsch p. 8
1964	Cheneosaurus Kuhn p. 15
1964	Hypacrosaurus Kuhn p. 20
1964	Cheneosaurus Tatarinov p. 567
1964	Hypacrosaurus Tatarinov p. 568
1966	Cheneosaurus Kuhn p. 103
1966	Cheneosaurus Romer p. 370
1966	Hypacrosaurus Romer p. 370
1967	Cheneosaurus Russell and Chamney p. 12
1967	Hypacrosaurus Russell and Chamney p. 12
1968	Cheneosaurus Rozhdestvensky
1968	Hypacrosaurus Rozhdestvensky
1970	Cheneosaurus Swinton p. 226
1970	Hypacrosaurus Swinton p. 226
1971	Hypacrosaurus Haubold p. 89
1974	Cheneosaurus Thulborn p. 173
1974	Hypacrosaurus Thulborn p. 173
1975	Hypacrosaurus Hopson p. 27 fig. 3
1979	Hypacrosaurus Brett-Surman p. 561 fig. 1
1983	Hypacrosaurus Weishampel and Weishampel p. 44
1984	Hypacrosaurus Brinkmann p. 302 fig. 4
1984	Hypacrosaurus Maryanska and Osmólska p. 131
1984	Hypacrosaurus Russell p. 26
1987	Hypacrosaurus Powell p. 150
1988	Cheneosaurus Carroll
1990	Hypacrosaurus Chapman and Brett-Surman p. 177
1990	Hypacrosaurus Weishampel and Horner p. 557
1994	Hypacrosaurus Forster and Sereno p. 25A
1994	Hypacrosaurus Horner and Currie p. 333
1997	Hypacrosaurus Dodson p. 12
1997	Hypacrosaurus Eberth p. 201
1997	Hypacrosaurus Vickaryous and Ryan p. 490
1998	Hypacrosaurus Godefroit et al. p. 51
2000	Hypacrosaurus Currie p. 277
2001	Hypacrosaurus Eberth et al. p. 57
2003	Hypacrosaurus Godefroit et al. p. 149
2004	Hypacrosaurus Godefroit et al. p. 148 fig. 6
2004	Hypacrosaurus Horner et al. p. 441
2006	Hypacrosaurus Lund and Gates p. 265
2006	Hypacrosaurus Prieto-Márquez et al. p. 938
2007	Hypacrosaurus Evans and Reisz pp. 386-387 fig. 9
2007	Hypacrosaurus Mo et al. p. 553 fig. 2
2008	Hypacrosaurus Godefroit et al. p. 67 fig. 18
2009	Hypacrosaurus Evans et al. p. 1316
2009	Hypacrosaurus Guenther p. 1428
2009	Hypacrosaurus Pereda-Suberbiola et al. p. 568 fig. 6
2010	Hypacrosaurus Cruzado-Caballero et al. p. 1510 fig. 4
2010	Hypacrosaurus Evans p. 405
2010	Hypacrosaurus Prieto-Marquez and Salinas p. 835 fig. 20
2010	Hypacrosaurus Prieto-Márquez p. 5 fig. 2
2010	Hypacrosaurus Prieto-Márquez and Wagner p. 1243 fig. 3
2010	Hypacrosaurus Reisz et al. p. 1664
2011	Hypacrosaurus Sullivan et al. p. 405
2012	Hypacrosaurus Godefroit et al. p. 551
2012	Hypacrosaurus Ramírez-Velasco et al. p. 392
2013	Hypacrosaurus Bailleul et al. p. 1
2013	Hypacrosaurus Cruzado-Caballero et al.
2013	Hypacrosaurus Prieto-Marquez et al.
2014	Hypacrosaurus Bolotsky et al. p. 329
2014	Hypacrosaurus Brink et al. p. 248
2016	Hypacrosaurus Lehman et al. p. 353
2017	Hypacrosaurus Cruzado-Caballero and Powell p. 12 fig. 13
2019	Hypacrosaurus Takasaki et al. p. 4

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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	()
—	Archosauromorpha	(Huene 1946)

Rank	Name	Author
—	Crocopoda
—	Archosauriformes	Gauthier 1986
—	Eucrocopoda
—	Archosauria	()
informal	Avemetatarsalia
—	Ornithodira
—	Dinosauromorpha
—	Dinosauriformes
—	Dinosauria	()
—	Ornithischia	()
—	Genasauria
—	Cerapoda
—	Ornithopoda	()
—	Clypeodonta
—	Iguanodontia	()
—	Dryomorpha
—	Styracosterna
—	Hadrosauriformes
—	Hadrosauroidea	()
family	Hadrosauridae
subfamily	Lambeosaurinae
tribe	Corythosaurini	Glut 1997
genus	Hypacrosaurus

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. †Hypacrosaurus Brown 1913

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†Hypacrosaurus altispinus Brown 1913

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Invalid names: Cheneosaurus tolmanensis Lambe 1917 [synonym]

†Hypacrosaurus stebingeri Horner and Currie 1994

Invalid names: Cheneosaurus Lambe 1917 [synonym]

Diagnosis

Reference	Diagnosis
D. C. Evans 2010	Lambeosaurine hadrosaurid that has the following autapomorphy: elongate neural spines in the cranial region of the dorsal vertebral column (dorsal vertebrae 6–10) that are greater than five times taller than their respective centra, as pointed out by Lull & Wright (1942): ‘dorsals unique in reduction of centra and in great development of the spinous processes which are high and massive, five to seven times the height of their respective centra’. Hypacrosaurus altispinus shares with H. stebingeri elongation and enlargement of the dorsal vertebra neural spines in the shoulder region.
K. S. Brink et al. 2014	Lambeosaurine hadrosaurid that has the following autapomorphies: (1) elongate neural spines in the cranial region of the dorsal vertebral column (dorsal vertebrae 6–10) that are greater than five times taller than their respective centra, and (2) complete closure of the premaxilla-nasal fontanelle (PNF in adult individuals. Hypacrosaurus altispinus shares with H. stebingeri elongation and enlargement of the dorsal vertebra neural spines in the shoulder region and complete closure of the premaxilla-nasal fontanelle in adults (all individuals with skull lengths ≥ 85% of the length of the largest known skull of that species). Complete closure of the PNF may also occur convergently in Parasaurolophus.