PBDB Taxon

Basic info	Taxonomic history	Classification	Included Taxa
Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Alligatoroidea

Reptilia

Taxonomy

Alligatoroidea was named by Gray (1844).

It was reranked as the unranked clade Alligatoroidea by Norell et al. (1994), Williamson (1996), Brochu (1999), Salisbury et al. (2006), Brochu et al. (2009), Rio and Mannion (2021).

It was assigned to Eusuchia by Astibia et al. (2000); to Eusuchia by Williamson (1996), Martin et al. (2010); to Brevirostres by Brochu (1999), Salisbury et al. (2006), Pinheiro et al. (2013), Farke et al. (2014); to Crocodylia by Silva Lacerda et al. (2020); and to Crocodylia by Norell et al. (1994), Böhme (2008), Brochu et al. (2009), Rio and Mannion (2021).

Subtaxa

Akanthosuchus, Balanerodus, Balanerodus logimus, Bottosaurus perrugosus, Deinosuchus (syn. Phobosuchus, Polydectes), Diplocynodon, Diplocynodontidae, Diplocynodontinae, Globidonta, Leidyosuchus, Menatalligator, Protoalligator

Synonyms

Balanerodus logimus was named by Langston (1965). Its type specimen is UCMP 45787, a tooth, and it is a 3D body fossil. Its type locality is Chaparral Alto San Jose, which is in a Miocene terrestrial breccia/claystone in the Barzalosa Formation of Colombia.

It was considered a nomen dubium by Cidade et al. (2019).
Balanerodus was named by Langston (1965).

It was considered a nomen dubium by Cidade et al. (2019).

It was assigned to Alligatoridae by Langston (1965), Carroll (1988), Riff et al. (2010).
Bottosaurus perrugosus was named by Cope (1874) [type is lost according to Gilmore 1911 found again (Norell et al. 1994)]. Its type specimen is AMNH-DVP 1110, a partial skeleton (fragmentary dentary, vertebrae, and pieces of the skull), and it is a 3D body fossil.

It was recombined as Brachychampsa perrugosa by Gilmore (1911), Hay (1930); it was considered a nomen dubium by Norell et al. (1994), Cossette and Brochu (2018).

Synonymy list

Year	Name and author
1844	Alligatoroidea Gray
1874	Bottosaurus perrugosus Cope p. 26
1875	Bottosaurus perrugosus Cope p. 452
1902	Bottosaurus perrugosus Hay p. 514
1902	Bottosaurus perrugosus Lambe p. 48
1911	Brachychampsa perrugosa Gilmore p. 298
1930	Brachychampsa perrugosa Hay p. 158
1965	Balanerodus Langston
1965	Balanerodus logimus Langston p. 114
1988	Balanerodus Carroll
1994	Alligatoroidea Norell et al. pp. 3-4
1996	Alligatoroidea Williamson p. 422
1999	Alligatoroidea Brochu
2000	Alligatoroidea Astibia et al. p. 237
2006	Alligatoroidea Salisbury et al. p. 2444
2008	Alligatoroidea Böhme p. 169
2009	Alligatoroidea Brochu et al. p. 538
2010	Alligatoroidea Martin et al.
2010	Balanerodus Riff et al.
2010	Balanerodus logimus Riff et al.
2013	Alligatoroidea Pinheiro et al.
2014	Alligatoroidea Farke et al.
2020	Alligatoroidea Silva Lacerda et al.
2021	Alligatoroidea Rio and Mannion

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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	()

Rank	Name	Author
—	Romeriida
—	Diapsida	()
—	Archosauromorpha	(Huene 1946)
—	Crocopoda
—	Archosauriformes	Gauthier 1986
—	Eucrocopoda
—	Archosauria	()
—	Pseudosuchia	(Zittel 1890)
—	Suchia	Krebs 1974
—	Paracrocodylomorpha
—	Loricata	(Merrem 1820)
—	Crocodylomorpha	()
—	Solidocrania
suborder	Crocodyliformes
—	Mesoeucrocodylia	Whetstone and Whybrow 1983
—	Neosuchia	Clark 1988
suborder	Eusuchia	Huxley 1875
—	Crocodylia	(Owen 1842)
—	Alligatoroidea	(Gray 1844)
—	Alligatoroidea	(Gray 1844)

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.

Unr. †Alligatoroidea Gray 1844

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G. †Akanthosuchus O'Neill et al. 1981

†Akanthosuchus langstoni O'Neill et al. 1981

G. †Deinosuchus Holland 1909

†Deinosuchus hatcheri Holland 1909

†Deinosuchus riograndensis Colbert and Bird 1954

†Deinosuchus schwimmeri Cossette and Brochu 2020

Invalid names: Phobosuchus Nopcsa 1924 [synonym], Pliogonodon priscus Leidy 1856 [nomen dubium], Polydectes Cope 1869 [synonym]

G. †Diplocynodon Pomel 1847

†Diplocynodon buetikonensis von Meyer 1855

†Diplocynodon darwini Ludwig 1877

†Diplocynodon deponiae Frey et al. 1987

†Diplocynodon elavericus Martin 2010

†Diplocynodon hantoniensis Wood 1846

Invalid names: Crocodilus hastingsiae Owen 1848 [synonym]

†Diplocynodon kochi Venczel and Codrea 2022

†Diplocynodon levantinicum Huene and Nikoloff 1963

†Diplocynodon muelleri Kalin 1936

Invalid names: Diplocynodon guerini Bataller 1941 [synonym], Diplocynodon marini Bataller 1941 [synonym]

†Diplocynodon plenidens Meyer 1838

Invalid names: Plerodon crocodiloides Meyer 1839 [synonym]

†Diplocynodon ratelii Pomel 1847

Invalid names: Asiatosuchus monsvialensis Fabiani 1914 [synonym], Diplocynodon gracilis Vaillant 1872 [synonym]

†Diplocynodon remensis Martin et al. 2014

†Diplocynodon tormis Buscalioni et al. 1992

†Diplocynodon ungeri Prangner 1845

Invalid names: Crocodilus steineri Hofmann 1887 [synonym], Crocodilus styriacus Hofmann 1887 [synonym]

Invalid names: Crocodylus dalpiazi Fabiani 1915 [nomen dubium], Crocodylus monsvialensis Fabiani 1914 [nomen dubium]

Fm. †Diplocynodontidae Hua 2004

G. †Baryphracta Frey et al. 1987

Unr. †Globidonta Brochu 1999

Unr. Alligatoridae Gray 1844

Unr. Alligatorinae Cuvier 1807

G. †Ahdeskatanka Cossette and Tarailo 2024

†Ahdeskatanka russlanddeutsche Cossette and Tarailo 2024

G. Alligator Daudin 1809 [alligator]

†Alligator darwini Ludwig 1877

Invalid names: Crocodilus brauniorum von Meyer 1843 [synonym], Crocodilus bruchi von Meyer 1843 [synonym], Crocodilus medius von Meyer 1843 [synonym], Crocodilus rahti von Meyer 1843 [synonym], Crocodylus ebertsi Ludwig 1877 [synonym]

†Alligator gaudryi de Stefano 1905

†Alligator hailensis Stout 2020

†Alligator hantoniensis Wood 1846

†Alligator luicus Li and Wang 1987

†Alligator mcgrewi Schmidt 1941

†Alligator mefferdi Mook 1946

Alligator mississippiensis Daudin 1801 [American alligator]

†Alligator munensis Darlim et al. 2023

†Alligator olseni White 1942

†Alligator prenasalis Loomis 1904

Invalid names: Allognathosuchus riggsi Patterson 1931 [synonym], Caimanoidea visheri Mehl 1916 [synonym]

Alligator sinensis Fauvel 1879 [Chinese alligator]

†Alligator thomsoni Mook 1923

G. †Allognathosuchus Mook 1921

†Allognathosuchus heterodon Cope 1873

†Allognathosuchus polyodon Cope 1873

†Allognathosuchus wartheni Case 1925

†Allognathosuchus woutersi Buffetaut 1985

G. †Arambourgia de Stefano 1905

†Arambourgia gaudryi de Stefano 1905

G. †Navajosuchus Mook 1942

†Navajosuchus mooki Simpson 1930

Invalid names: Navajosuchus novomexicanus Mook 1942 [synonym]

Unr. †Caimaninae Brochu 1999

Unr. †Brachychampsini Cossette and Tarailo 2024

G. †Albertochampsa Erickson 1972

G. †Brachychampsa Gilmore 1911

G. †Chrysochampsa Estes 1988

G. †Stangerochampsa Wu et al. 1996

G. †Centenariosuchus Hastings et al. 2013

†Centenariosuchus gilmorei Hastings et al. 2013

G. †Ceratosuchus Schmidt 1938

†Ceratosuchus burdoshi Schmidt 1938

G. †Chinatichampsus Stocker et al. 2021

†Chinatichampsus wilsonorum Stocker et al. 2021

G. †Culebrasuchus Hastings et al. 2013

†Culebrasuchus mesoamericanus Hastings et al. 2013

G. †Globidentosuchus Scheyer et al. 2013

†Globidentosuchus brachyrostris Scheyer et al. 2013

G. †Gnatusuchus Salas-Gismondi et al. 2015

†Gnatusuchus pebasensis Salas-Gismondi et al. 2015

Unr. †Jacarea Gray 1844

G. †Acresuchus Souza-Filho et al. 2019

G. †Bottosaurus Agassiz 1849

G. Caiman Spix 1825 [caiman]

Invalid names: Jacaretinga Spix 1825 [synonym]

G. Melanosuchus Gray 1862 [black caiman]

G. †Necrosuchus Simpson 1937

G. Paleosuchus Gray 1862 [caiman]

G. †Protocaiman Bona et al. 2018

G. †Purussaurus Barbosa Rodrigues 1892

G. †Tsoabichi Brochu 2010

Invalid names: Caiman lutescens Rovereto 1912 [nomen dubium]

G. †Kuttanacaiman Salas-Gismondi et al. 2015

†Kuttanacaiman iquitosensis Salas-Gismondi et al. 2015

G. †Mourasuchus Price 1964

†Mourasuchus amazonensis Price 1964

†Mourasuchus arendsi Bocquentin Villanueva 1984

Invalid names: Mourasuchus nativus Gasparini 1985 [synonym]

†Mourasuchus atopus Langston 1965

†Mourasuchus pattersoni Cidade et al. 2017

Invalid names: Carandaisuchus Gasparini 1985 [synonym], Nettosuchus Langston 1965 [synonym]

G. †Orthogenysuchus Mook 1924

†Orthogenysuchus olseni Mook 1924

G. †Paranacaiman Bona et al. 2024

†Paranacaiman bravardi Bona et al. 2024

G. †Paranasuchus Bona et al. 2024

†Paranasuchus gasparinae Bona and Carabajal 2013

G. †Wannaganosuchus Erickson 1982

†Wannaganosuchus brachymanus Erickson 1982

Invalid names: Caiman tremembensis Chiappe 1988 [nomen dubium], Nettosuchidae Langston 1965 [empty]

G. †Caimanoidea Mehl 1916

G. †Caimanosuchus Kuhn 1938

†Caimanosuchus brevirostris Kuhn 1938

G. †Dinosuchus Gervais 1876

G. †Eocenosuchus Kuhn 1938

†Eocenosuchus weigelti Kuhn 1938

G. †Hispanochampsa Kalin 1936

G. †Lianghusuchus Young 1948

†Lianghusuchus hengyangensis Young 1948

G. †Listrognathosuchus Brochu 1997

†Listrognathosuchus multidentatus Mook 1930

G. †Proalligator Ambrosetti 1890

G. †Eocaiman Simpson 1933

†Eocaiman cavernensis Simpson 1933

†Eocaiman itaboraiensis Pinheiro et al. 2013

†Eocaiman palaeocenicus Bona 2007

Invalid names: Notocaiman Rusconi 1937 [synonym]

G. †Hassiacosuchus Weitzel 1935

†Hassiacosuchus haupti Weitzel 1935

Unr. †Orientalosuchina Massonne et al. 2019

G. †Dongnanosuchus Shan et al. 2021

†Dongnanosuchus hsui Shan et al. 2021

G. †Eoalligator Young 1964 [early alligator]

†Eoalligator chunyii Young 1964

G. †Eurycephalosuchus Wu et al. 2023

†Eurycephalosuchus gannanensis Wu et al. 2023

G. †Krabisuchus Martin and Lauprasert 2010

†Krabisuchus siamogallicus Martin and Lauprasert 2010

G. †Orientalosuchus Massonne et al. 2019

†Orientalosuchus naduongensis Massonne et al. 2019

G. †Procaimanoidea Gilmore 1946

†Procaimanoidea kayi Mook 1941

†Procaimanoidea utahensis Gilmore 1946

G. †Leidyosuchus Lambe 1907

†Leidyosuchus canadensis Lambe 1907

Invalid names: Leidyosuchus gilmorei Mook 1942 [synonym]

G. †Menatalligator Piton 1940

†Menatalligator bergouniouxi Piton 1940

G. †Protoalligator Wang et al. 2016

†Protoalligator huiningensis Young 1982

Invalid names: Balanerodus Langston 1965 [nomen dubium], Balanerodus logimus Langston 1965 [nomen dubium], Bottosaurus perrugosus Cope 1874 [nomen dubium], Diplocynodontinae Brochu 1999 [empty]

Diagnosis

Reference	Diagnosis
M. A. Norell et al. 1994	We provisionally diagnose this group by the following derived features: pit in the rostrum for occlusion of the fourth mandibular tooth, quadratojugal spine on the posterior margin of the lateral temporal fenestra very small or absent, foramen aerum on the dorsal surface of the articular, displaced laterad to medial edge ofretroarticular process, atlas intercentrum longer than broad.