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Alligator prenasalis

Reptilia

Taxonomy
Crocodilus prenasalis was named by Loomis (1904). It is a 3D body fossil. Its type locality is Indian Draw (SDSM Titanothere Beds), which is in a Chadronian fluvial-lacustrine siliciclastic in the Chadron Formation of South Dakota.

It was recombined as Caimanoidea prenasalis by Hay (1930); it was recombined as Alligator prenasalis by Matthew (1918), Barbour (1926), Schmidt (1941), Brochu (1999), Snyder (2007) and Rio and Mannion (2021).

Sister species lacking formal opinion data
A. mississipiensis

Synonyms
  • Allognathosuchus riggsi was named by Patterson (1931). Its type specimen is Field Museum P 12141, a mandible (left mandible), and it is a 3D body fossil. Its type locality is Phinney Springs, which is in a Chadronian fluvial-lacustrine siliciclastic in the Chadron Formation of South Dakota.

    It was recombined as Alligator riggsi by Schmidt (1941); it was synonymized subjectively with Alligator prenasalis by Brochu (1999).
  • Caimanoidea visheri was named by Mehl (1916). Its type specimen is University of South Dakota 1,044, a partial skeleton (goodly portion of a skull, a nearly complete mandible, two femora and other limb bones, a nearly complete series of vertebrae, many dorsal scutes, and numerous ), and it is a 3D body fossil. Its type locality is Caimanoidea visheri type locality, which is in a Chadronian fluvial-lacustrine siliciclastic in the Chadron Formation of South Dakota. It is the type species of Caimanoidea.

    It was recombined as Alligator vischeri by Schmidt (1941); it was synonymized subjectively with Alligator prenasalis by Higgins (1972).
Synonymy list
YearName and author
1904Crocodilus prenasalis Loomis p. 427
1908Crocodilus prenasalis Lambe
1916Caimanoidea visheri Mehl p. 47
1918Alligator prenasalis Matthew
1926Alligator prenasalis Barbour p. 110
1930Caimanoidea prenasalis Hay p. 158
1930Caimanoidea visheri Hay p. 158
1931Allognathosuchus riggsi Patterson p. 223
1941Alligator prenasalis Schmidt p. 32
1941Alligator riggsi Schmidt p. 32
1941Alligator vischeri Schmidt p. 32
1946Caimanoidea visheri Gilmore p. 67
1967Allognathosuchus riggsi Bjork p. 230
1999Alligator prenasalis Brochu
2007Alligator prenasalis Snyder p. 923
2021Alligator prenasalis Rio and Mannion

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
—Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
—Sauropsida
classReptilia
subclassEureptilia()
—Romeriida
—Diapsida()
RankNameAuthor
—Archosauromorpha(Huene 1946)
—Crocopoda
—ArchosauriformesGauthier 1986
—Eucrocopoda
—Archosauria()
—Pseudosuchia(Zittel 1890)
—SuchiaKrebs 1974
—Paracrocodylomorpha
—Loricata(Merrem 1820)
—Crocodylomorpha()
—Solidocrania
suborderCrocodyliformes
—MesoeucrocodyliaWhetstone and Whybrow 1983
—NeosuchiaClark 1988
suborderEusuchiaHuxley 1875
—Crocodylia(Owen 1842)
—Alligatoroidea(Gray 1844)
—Globidonta
—Alligatoridae(Gray 1844)
—Alligatorinae(Cuvier 1807)
genusAlligatorDaudin 1809
speciesprenasalis()

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.

†Alligator prenasalis Loomis 1904
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Invalid names: Allognathosuchus riggsi Patterson 1931 [synonym], Caimanoidea visheri Mehl 1916 [synonym]
Diagnosis
No diagnoses are available
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: marineuc
Locomotion: actively mobilec
Diet: carnivoreuc
Created: 2009-01-03 20:38:59
Modified: 2009-01-03 22:38:59
Source: c = class, subp = subphylum, uc = unranked clade
References: Benton 1983, Carroll 1988, Bush and Bambach 2015, Hendy et al. 2009

Age range: base of the Chadronian to the top of the Duchesnean or 37.20000 to 37.00000 Ma

Collections (8 total)


Time interval Ma Country or state Original ID and collection number
Duchesnean39.7 - 37.0USA (South Dakota) Allognathosuchus riggsi (16823)
Chadronian37.2 - 33.9USA (South Dakota) Alligator prenasalis (16885 16938 99855) Allognathosuchus riggsi (99708) Caimanoidea visheri (99707) Crocodilus prenasalis (99709 type locality: 99711)