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Alligator olseni

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Extinct species of reptile

Olsen's alligator
Temporal range: Early Miocene 20.4–16 Ma PreꞒ O S D C P T J K Pg N
Forelimbs of Alligator olseni
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Archosauromorpha
Clade: Archosauriformes
Order: Crocodilia
Family: Alligatoridae
Subfamily: Alligatorinae
Genus: Alligator
Species: A. olseni
Binomial name
Alligator olseni
White, 1942

Alligator olseni (common name Olsen's Alligator, named after Russel Olsen) is an extinct species of alligator. They lived in the Early Miocene period, around 20.4–15.97 million years ago and possibly earlier. Their range was principally in what is now known as Florida, United States, and possibly extending into southeastern Texas. It is a small alligator with an estimated body length of 2.6 metres (8.5 ft).

Classification

Alligator olseni is a member of the subfamily Alligatorinae, within the larger family Alligatoridae. It is closely related to the living American alligator and Chinese alligator, as shown in the cladogram below:

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

References

  1. Rio, Jonathan P.; Mannion, Philip D. (6 September 2021). "Phylogenetic analysis of a new morphological dataset elucidates the evolutionary history of Crocodylia and resolves the long-standing gharial problem". PeerJ. 9: e12094. doi:10.7717/peerj.12094. PMC 8428266. PMID 34567843.
  2. T. E. White. 1942. A new alligator from the Miocene of Florida. Copeia 1942(1):3-7
  3. "Alligator olseni". Florida Museum of Natural History. Retrieved 18 June 2016.
  4. "Alligator olseni". Fossilworks. Retrieved 17 December 2021.
  5. Ikejiri, T. (2010). Morphology of the Neurocentral Junction during Postnatal Growth of Alligator (Reptilia, Crocodylia) (PhD thesis). University of Michigan.
  6. 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.
  7. 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.
Extinct crocodilians
Pseudosuchia
Neosuchia
Crocodilia
    • see below↓
Basal crocodilians
Mekosuchinae
Others
Alligatoroidea
Alligatoroidea
Globidonta
Orientalosuchina
Alligatoridae
Alligatorinae
Alligator
Caimaninae
Melanosuchus
Caiman
Deinosuchus riograndensis Purussaurus brasiliensis
Longirostres
Crocodyloidea
Crocodylidae
Osteolaeminae
Crocodylinae
Crocodylus
Gavialoidea
Gavialidae
Tomistominae
sensu stricto
Tomistoma
Gavialinae
sensu lato
Gavialis
Crocodylus anthropophagus Hanyusuchus sinensis
Taxon identifiers
Alligator olseni


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