Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If you need an accessible version of this item please contact JSTOR User Support

Alligatorine Phylogeny and the Status of Allognathosuchus Mook, 1921

Christopher A. Brochu
Journal of Vertebrate Paleontology
Vol. 24, No. 4 (Dec. 10, 2004), pp. 857-873
Stable URL: http://www.jstor.org/stable/4524781
Page Count: 17
  • More info
  • Cite this Item
If you need an accessible version of this item please contact JSTOR User Support
Alligatorine Phylogeny and the Status of Allognathosuchus Mook, 1921
Preview not available

Abstract

Whether the extinct crocodylians given the name Allognathosuchus represent a monophyletic assemblage remains controversial, and some have argued that Wannaganosuchus brachymanus Erickson, 1982 is a form of Allognathosuchus. A revised phylogenetic analysis supports a set of relationships in which the type species of Allognathosuchus (A. polyodon) is closer to Alligator than it is to European "Allognathosuchus" or "Allognathosuchus" from the North American Paleocene, and a close relationship between Allognathosuchus and Wannaganosuchus is not supported. One European fossil assigned to Allognathosuchus, A. woutersi, is similar (and possibly referable) to Diplocynodon. Chrysochampsa mlynarskii can be distinguished from all other Early Tertiary alligatoroids, but its relationships to other members of the clade (and whether it should be placed within Allognathosuchus) are unclear. These results support multiple dispersal events of alligatorines from North America to Eurasia, and suggest that the cranial anatomy thought to distinguish forms such as Allognathosuchus is plesiomorphic at the level of Alligatoridae. The name Allognathosuchus should be applied in a restricted sense to Allognathosuchus polyodon and its closest relatives, with alternative generic names applied to distantly related "Allognathosuchus."

Page Thumbnails

  • Thumbnail: Page 
857
    857
  • Thumbnail: Page 
858
    858
  • Thumbnail: Page 
859
    859
  • Thumbnail: Page 
860
    860
  • Thumbnail: Page 
861
    861
  • Thumbnail: Page 
862
    862
  • Thumbnail: Page 
863
    863
  • Thumbnail: Page 
864
    864
  • Thumbnail: Page 
865
    865
  • Thumbnail: Page 
866
    866
  • Thumbnail: Page 
867
    867
  • Thumbnail: Page 
868
    868
  • Thumbnail: Page 
869
    869
  • Thumbnail: Page 
870
    870
  • Thumbnail: Page 
871
    871
  • Thumbnail: Page 
872
    872
  • Thumbnail: Page 
873
    873