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Listrognathosuchus
''Listrognathosuchus'' is an extinct genus of alligatoroid crocodilian. Fossils date back to the middle Paleocene epoch. In 1997, the generic name replaced that of ''Leidyosuchus'' for the species ''L. multidentatus'' (now the type species of ''Listrognathosuchus'').〔Brochu, C. A. (1997). A review of "''Leidyosuchus''" (Crocodyliformes, Eusuchia) from the Cretaceous through Eocene of North America. ''Journal of Vertebrate Paleontology'' 17(4):679–697.〕 ''"L." multidentalis'' was first described by Charles Mook in 1930 on the basis of the holotype AMNH 5179, consisting of a partial vertebral column, mandible, partial left ilium, and left tibia, found from a locality in Torrejon Arroyo, New Mexico (then referred to as the Torrejon beds, and now thought to be part of the Nacimiento Formation).〔Mook, C. C. (1930). A new species of crocodilian from the Torrejon Beds. ''American Museum Novitates'' 447:1-11.〕
==Phylogenetics==
The fragmentary nature of the material referable to ''Listrognathosuchus'' have made it hard to classify within Crocodylia, but it is now thought to be a relatively basal alligatoroid. ''Listrognathosuchus'' is closely related to ''Borealosuchus'', a more basal eusuchian that is not an alligatoroid, but rather a close relative of a monophyletic group of which the superfamilies Alligatoroidea and Crocodyloidea comprise. In fact, ''Borealosuchus'' was first used as a replacement name for four species of ''Leidyosuchus'', the same genus that ''Listrognathosuchus multidentatus'' once belonged to. Prior to the reassessment of ''Leidyosuchus'' in 1997, many relationships for the genus within Crocodilia have been considered. It was suggested to be a possible member of Diplocynodontinae〔Gilmore, C. W. (1910). ''Leidyosuchus sternbergii'', a new species of crocodile from the Cretaceous beds of Wyoming. ''Proceedings of the United States National Museum'' 38(1762):485-502.〕〔Rauhe, M. and Rossmann, T. (1995). News about fossil crocodiles from the middle Eocene of Messel and Geiseltal, Germany. Halllesches Jahrbuch fur Geowissenschaften 17:18-92.〕 or a relative of later crocodylids,〔Kälin, J. A. (1955). "Crocodilia". ''In:'' Piveteau, J., ed., ''Traité de Paléontologie, Vol. 5. Masson, Paris. pp. 695-784.〕〔Berg, D. E. (1966). Die Krokodile, insbesondere ''Asiatosuchus'' und aff. ''Sebecus?'', aus dem Eozän von Messel bei Darmstadt/Hessen. ''Abhandlungen des Hessischen Landesamtes für Bodenforschung'' 52:1-105.〕〔Steel, R. (1973). ''Handbuch der Paleoherpetologie. Vol. 16: Crocodilia''. Fischer-Verlag, Portland, Oregon. 116pp.〕〔Bartels, W. S. (1980). Early Cenozoic reptiles and birds from the Bighorn Basin, Wyoming. ''University of Michigan Papers on Paleontology'' 24:73-80.〕 and even as a member of its own subfamily of broad snouted early eusuchians, Leidysuchinae.〔Nopcsa, F. (1928). Palaeontoloical notes on reptiles, VII: On the classification of the Crocodilia. ''Geologica Hungarica (Series Palaeontologica) 1(1):75-84.〕〔Nopcsa, F. (1928). The genera of reptiles. ''Palaeobiologica'' 1:163-188.〕〔Simpson, G. G. (1937). An ancient eusuchian crocodile from Patagonia. ''American Museum Novitates'' 965:1-20.〕 However, with the naming of ''Listrognathosuchus'' and ''Borealosuchus'', most species previously assigned to ''Leidyosuchus'' are now believed to have had little relation to any of the mentioned crocodilians.
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