Alligator thomsoni

Alligator thomsoni is an extinct species of alligator that existed during the Early Miocene period. Their range was principally in what is now known as Nebraska, United States.^[1][2]

Alligator thomsoni Temporal range: Miocene 16–13.6 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Clade:	Archosauromorpha
Clade:	Archosauriformes
Order:	Crocodilia
Family:	Alligatoridae
Genus:	Alligator
Species:	†A. thomsoni
Binomial name
†Alligator thomsoni Mook, 1923

Classification

Alligator thomsoni is a member of the subfamily Alligatorinae, within the larger family Alligatoridae. It is closely related to the living American alligator, as shown in the cladogram below:^[3][4]

Alligatoridae

Caimaninae Alligatorinae Ceratosuchus burdoshi† Hassiacosuchus haupti† Navajosuchus mooki† Wannaganosuchus brachymanus† Arambourgia gaudryi† Allognathosuchus polyodon† Allognathosuchus wartheni† Procaimanoidea kayi† Alligator Alligator prenasalis† Alligator mcgrewi† Alligator olseni† Alligator sinensis Chinese alligator Alligator thomsoni† Alligator mefferdi† Alligator mississippiensis American alligator

Measurements

The average measurement for the skull of a A. thomsoni is 363.0 x 223.0 in millimeters. Based on the length, the estimated body mass 67.8 kg.^[1]

References

• Paleontology portal

1. “Alligator Thomsoni Mook 1923 (Alligator).” Fossilworks, Fossilworks.
2. “Alligator Thomsoni Mook, 1923.” GBIF, www.gbif.org/species/4967707.
3. Hastings, A. K.; Bloch, J. I.; Jaramillo, C. A.; Rincon, A. F.; MacFadden, B. J. (2013). "Systematics and biogeography of crocodylians from the Miocene of Panama". Journal of Vertebrate Paleontology. 33 (2): 239. Bibcode:2013JVPal..33..239H. doi:10.1080/02724634.2012.713814. S2CID 83972694.
4. Brochu, C. A. (2011). "Phylogenetic relationships of Necrosuchus ionensis Simpson, 1937 and the early history of caimanines". Zoological Journal of the Linnean Society. 163: S228 – S256. doi:10.1111/j.1096-3642.2011.00716.x.