Neosuchia Explained

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] Members of Neosuchia generally share a crocodilian-like bodyform adapted to freshwater aquatic life, as opposed to the terrestrial habits of more basal crocodylomorph groups.[3] The earliest neosuchian is suggested to be the Early Jurassic Calsoyasuchus, which lived during the Sinemurian and Pliensbachian stages in North America. It is often identified as a member of Goniopholididae,[4] though this is disputed, and the taxon may lie outside Neosuchia, which places the earliest records of the group in the Middle Jurassic.

Characteristics

Members of Neosuchia have a wide diversity of skull shapes. Several groups convergently evolved elongate gharial-like skulls, which makes determining phylogenetic relationships of these taxa problematic.[5]

Classification

Phylogeny

Below is a cladogram showing the phylogenetic relationships of neosuchians from Buscalioni et al., 2011:[6]

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:[7]

External links

Notes and References

  1. Wilson . J. A. . Malkani . M. S. . Gingerich . P. D. . 2001 . New crocodyliform (Reptilia, Mesoeucrocodylia) from the Upper Cretaceous Pab Formation of Vitakri, Balochistan (Pakistan) . Contributions from the Museum of Paleontology, University of Michigan . 30 . 12 . 321–336 . 2009-11-02.
  2. Larsson . H. C. E. . Sidor . C. A. . Cristian Sidor . Gado . B. . 2001 . The giant crocodyliform Sarcosuchus from the Cretaceous of Africa . . 294 . 5546 . 1516–1519 . 2009-11-02 . 10.1126/science.1066521 . 11679634 . Gado . B . 22956704 . 2012-03-14 . https://web.archive.org/web/20120314191603/http://iris.nyit.edu/nycom/Faculty/Profiles/Sidor/Sarcosuchus.pdf . dead .
  3. Wilberg. Eric W.. Turner. Alan H.. Brochu. Christopher A.. 2019-01-24. Evolutionary structure and timing of major habitat shifts in Crocodylomorpha. Scientific Reports. en. 9. 1. 514. 2019NatSR...9..514W. 10.1038/s41598-018-36795-1. 2045-2322. 6346023. 30679529.
  4. 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 . . 22 . 3 . 593–611 . 2009-11-02 . 10.1671/0272-4634(2002)022[0593:CVANCF]2.0.CO;2.
  5. Groh . Sebastian S . Upchurch . Paul . Barrett . Paul M . Day . Julia J . 2019-10-19 . The phylogenetic relationships of neosuchian crocodiles and their implications for the convergent evolution of the longirostrine condition . Zoological Journal of the Linnean Society . en . 10.1093/zoolinnean/zlz117 . 0024-4082.
  6. 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 . 10.1111/j.1096-3642.2011.00718.x . free .
  7. Bronzati . M. . Montefeltro . F. C. . Langer . M. C. . A species-level supertree of Crocodyliformes . 10.1080/08912963.2012.662680 . Historical Biology . 24 . 6 . 598–606 . 2012 . 53412111 .

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Neosuchia".

Except where otherwise indicated, Everything.Explained.Today is © Copyright 2009-2024, A B Cryer, All Rights Reserved. Cookie policy.