Neosuchia
Neosuchia is a clade within Mesoeucrocodylia that includes all modern extant crocodilians and their closest fossil relatives.[1] It is defined as the most inclusive clade containing all crocodylomorphs more closely related to Crocodylus niloticus (the Nile Crocodile) than to Notosuchus terrestris.[2] Neosuchia is very diverse and may be polyphyletic, as the clade has undergone many revisions since it was first named in 1988.[3] Neosuchians first appear in the Early Jurassic with the earliest known goniopholid Calsoyasuchus, which lived during the Sinemurian and Pliensbachian stages.[4]
Characteristics
A tooth notch between the maxilla and premaxilla is a basal characteristic of the Neosuchia, although it is lost in some more derived forms, most notably alligatorids.
Classification
Below is a cladogram showing the phylogenetic relationships of neosuchians from Buscalioni et al., 2011:[5]
In 2012, paleontologists Mario Bronzati, Felipe Chinaglia Montefeltro, and Max C. Langer conducted a broad phylogenetic analysis to produce supertrees of Crocodyliformes, including 184 species. The most parsimonious trees were highly resolved, meaning the phylogenetic relationships found in the analysis were highly likely. Below is a consensus tree from the study:[6]
See also
References
- ↑ Wilson, J. A.; Malkani, M. S.; Gingerich, P. D. (2001). "New crocodyliform (Reptilia, Mesoeucrocodylia) from the Upper Cretaceous Pab Formation of Vitakri, Balochistan (Pakistan)" (PDF). Contributions from the Museum of Paleontology, University of Michigan 30 (12): 321–336. Retrieved 2009-11-02.
- ↑ Larsson, H. C. E.; Sidor, C. A.; Gado, B.; Gado, B (2001). "The giant crocodyliform Sarcosuchus from the Cretaceous of Africa" (PDF). Science 294 (5546): 1516–1519. doi:10.1126/science.1066521. PMID 11679634. Retrieved 2009-11-02.
- ↑ Benton, M. J. & Clark, J. M. (1998). Archosaur phylogeny and the relationships of the Crocodylia, p. 289-332. In Benton, M.J. (ed.), The Phylogeny and Classification of Tetrapods, Vol. 1 ., Clarendon Press, Oxford.
- ↑ Tykoski, R. S.; Rowe, T. B.; Ketcham, R. A.; Colbert, M. W. (2002). "Calsoyasuchus valliceps, a new crocodyliform from the Early Jurassic Kayenta Formation of Arizona" (PDF). Journal of Vertebrate Paleontology 22 (3): 593–611. doi:10.1671/0272-4634(2002)022[0593:CVANCF]2.0.CO;2. Retrieved 2009-11-02.
- ↑ Buscalioni, A.D.; Piras, P.; Vullo, R.; Signore, M.; Barbera, C. (2011). "Early eusuchia crocodylomorpha from the vertebrate-rich Plattenkalk of Pietraroia (Lower Albian, southern Apennines, Italy)". Zoological Journal of the Linnean Society 163: S199–S227. doi:10.1111/j.1096-3642.2011.00718.x.
- ↑ Bronzati, M.; Montefeltro, F. C.; Langer, M. C. (2012). "A species-level supertree of Crocodyliformes". Historical Biology: 1. doi:10.1080/08912963.2012.662680.
External links
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- Marine crocodylomorphs
- Terrestrial crocodylomorphs
- Jurassic crocodylomorphs
- Cretaceous crocodylomorphs
- Paleogene crocodylomorphs
- Neogene crocodylomorphs
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