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The taxonomic status of the phytosaurs (Archosauriformes) Machaeroprosopus and Pseudopalatus from the Late Triassic of the western United States

  • William G. Parker (a1) (a2), Axel Hungerbühler (a3) and Jeffrey W. Martz (a4)
Abstract
ABSTRACT

The genus Machaeroprosopus has long been considered invalid because the type specimen of the Late Triassic phytosaur species, M. validus, has been lost. Re-examination of the primary literature regarding the establishment of the Late Triassic phytosaur genus Machaeroprosopus demonstrates that M. buceros is the correct type species, not M. validus. Thus, the genus level name Machaeroprosopus has priority over the genera Pseudopalatus and Arribasuchus and all nominal species should be reassigned. Reassignment of these species to Machaeroprosopus satisfies the requirements of the International Code of Zoological Nomenclature (ICZN) and preserves historical context. The name Pseudopalatinae is retained as the valid clade name for these phytosaurs because its usage falls outside of the ICZN.

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Abel O. 1923. Die Schnauzenverletzungen der Parasuchier und ihre biologische Bedeutung. Paläontologische Zeitschrift 5, 2657.
Ballew K. L. 1989. A phylogenetic analysis of Phytosauria (Reptilia: Archosauria) from the late Triassic of the western United States. In Lucas S. G. & Hunt A. P. (eds) Dawn of the age of dinosaurs in the American Southwest, 309–39. Albuquerque: New Mexico Museum of Natural History and Science.
Bell C. J., Gauthier J. A. & Bever G. S. 2010. Covert biases, circularity, and apomorphies: a critical look at the North American quaternary herpetofaunal stability hypothesis. Quaternary International 217 (1–2), 3036.
Camp C. L. 1930. A study of the phytosaurs with description of new material from western North America. Memoirs of the University of California 10, 1174.
Case E. C. 1920. Preliminary description of a new suborder of phytosaurian reptiles with a description of a new species of Phytosaurus. Journal of Geology 28, 524–35.
Case E. C. 1922. New reptiles and stegocephalians from the Upper Triassic of western Texas. Carnegie Institution of Washington Publication 321, 184.
Colbert E. H. 1947. Studies of the phytosaurs Machaeroprosopus and Rutiodon. American Museum of Natural History Bulletin 88, 5396.
Cope E. D. 1881. Belodon in New Mexico. The American Naturalist 15, 922–23.
Cope E. D. 1887. A contribution to the history of the Vertebrata of the Trias of North America. Proceedings of the American Philosophical Society 24, 209–28.
Cope E. D. 1888. The pineal eye in extinct vertebrates. American Naturalist 24, 914–17.
Doyle K. D. & Sues H.-D. 1995. Phytosaurs (Reptilia: Archosauria) from the Upper Triassic New Oxford Formation of York County, Pennsylvania. Journal of Vertebrate Paleontology 15 (3), 545–53.
Emmons E. 1856. Geological report of the midland counties of North Carolina. New York: George P. Putnam and Co. XX+352 pp.
Fraas E. 1896. Die schwäbischen Trias-Saurier nach dem Material der Kgl. Naturalien-Sammlung in Stuttgart zusammengestellt. Stuttgart: Schweizerbart. 18 pp.
Fraas O. 1866. Vor der Sündfluth! Eine Geschichte der Urwelt. Stuttgart: Hoffmann. 512 pp.
Gauthier J. A., Kluge A. G. & Rowe T. 1988. Amniote phylogeny and the importance of fossils. Cladistics 4 (2), 105209.
Gregory J. T. 1962. The genera of phytosaurs. American Journal of Science 260, 652–90.
Gregory J. T. 1972. Vertebrate faunas of the Dockum Group, Triassic, eastern New Mexico and west Texas. New Mexico Geological Society Guidebook 23, 120–23.
Hungerbühler A. 2002. The Late Triassic phytosaur Mystriosuchus westphali, with a revision of the genus. Palaeontology 45 (2), 377418.
Hungerbühler A., Chatterjee S. & Cunningham D. 2003. A new phytosaur species from the Triassic of West Texas: new information on cranial anatomy, taxonomy and sexual dimorphism in Pseudopalatinae. Journal of Vertebrate Paleontology 23 (Suppl. to 3), 63A.
Hungerbühler A., Mueller B., Chatterjee S. & Cunningham D. P. 2013. Cranial anatomy of the Late Triassic phytosaur Machaeroprosopus, with the description of a new species from west Texas. Earth and Environmental Science Transactions of the Royal Society of Edinburgh 103 (for 2012), 269312
Hunt A. P. 1994. Vertebrate paleontology and biostratigraphy of the Bull Canyon Formation (Chinle Group, Upper Triassic), east-central New Mexico with revisions of the families Metoposauridae (Amphibia: Temnospondyli) and Parasuchidae (Reptilia: Archosauria). Unpublished Ph.D. Thesis, University of New Mexico, Albuquerque. 404 pp.
Hunt A. P. 2001. The vertebrate fauna, biostratigraphy and biochronology of the type Revueltian land-vertebrate faunachron, Bull Canyon Formation (Upper Triassic), east-central New Mexico. New Mexico Geological Society Guidebook 52, 123–51.
International Commission on Zoological Nomenclature (ICZN). 1999. International Code of Zoological Nomenclature, 4th edition. London: The International Trust for Zoological Nomenclature. 126 pp.
Irmis R. B., Mundil R., Martz J. W. & Parker W. G. 2011. High-resolution U–Pb ages from the Upper Triassic Chinle Formation (New Mexico, USA) support a diachronous rise of dinosaurs. Earth and Planetary Science Letters 309 (3–4), 258–67.
Jaeger G. F. 1828. Über die fossilen Reptilien, welche in Würtemberg aufgefunden worden sind. Stuttgart: Metzler. 48 pp.
Jaekel O. 1910. Ueber einen neuen Belodonten aus dem Buntsandstein von Bernburg. Sitzungsberichte der Gesellschaft Naturforschender Freunde zu Berlin 1910, 197229.
Long R. A. & Murry P. A. 1995. Late Triassic (Carnian and Norian) tetrapods from the southwestern United States. New Mexico Museum of Natural History and Science Bulletin 4. Albuquerque: New Mexico Museum of Natural History and Science. 254 pp.
Lucas S. G., Heckert A. B., Zeigler K. E. & Hunt A. 2002. The type locality of Belodon buceros Cope, 1881, a phytosaur (Archosauria: Parasuchidae) from the Upper Triassic of north-central New Mexico. In Heckert A. B. & Lucas S. G. (eds) Upper Triassic stratigraphy and paleontology. New Mexico Museum of Natural History and Science Bulletin 21, 189–92. Albuquerque: New Mexico Museum of Natural History and Science. 301 pp.
Lucas S. G. & Hunt A. P. 1993. Tetrapod biochronology of the Chinle Group (Upper Triassic), western United States. In Lucas S. G. & Morales M. (eds) The nonmarine Triassic. New Mexico Museum of Natural History and Science Bulletin 3, 327–29. Albuquerque: New Mexico Museum of Natural History and Science. 478 pp.+59 pp.
Martz J. W. 2008. Lithostratigraphy, chemostratigraphy, and vertebrate biostratigraphy of the Dockum Group (Upper Triassic), of southern Garza County, West Texas. Unpublished Ph.D. Dissertation, Texas Tech University, Lubbock, Texas, USA. 504 pp.
Mehl M. G. 1916. New or little known phytosaurs from Arizona. In Mehl M. G., Toepelmann W. C. & Schwartz G. M. (eds) New or little known reptiles from the Trias of Arizona and New Mexico, with notes from the fossil bearing horizons near Wingate, New Mexico. Bulletin of the University of Oklahoma, new series 103, University Studies Series 5. Norman: University of Oklahoma. 44 pp.
Mehl M. G. 1922. A new phytosaur from the Trias of Arizona. Journal of Geology 30, 144–57.
Mehl M. G. 1928. Pseudopalatus pristinus a new genus and species of phytosaurs from Arizona. University of Missouri Quarterly 3, 125.
Meyer H. v. & Plieninger T. 1844. Beiträge zur Paläontologie Württemberg's enthaltend die fossilen Wirbelthierreste aus den Triasgebilden mit besonderer Rücksicht auf die Labyrinthodonten des Keupers. Stuttgart: Schweizerbart. 131 pp.
Nesbitt S. J. 2011. The early evolution of archosaurs: relationships and origin of major clades. Bulletin of the American Museum of Natural History 352, 292 pp.
Osborn H. F. 1908. New or little known titanotheres from the Eocene and Oligocene. Bulletin of the American Museum of Natural History 24, 599617.
Parker W. G. & Irmis R. B. 2006. A new species of the Late Triassic phytosaur Pseudopalatus (Archosauria: Pseudosuchia) from Petrified Forest National Park, Arizona. Museum of Northern Arizona Bulletin 62, 126–43.
Parker W. G. & Martz J. W. 2011. The Late Triassic (Norian) Adamanian-Revueltian tetrapod faunal transition in the Chinle Formation of Petrified Forest National Park, Arizona. Earth and Environmental Science Transactions of the Royal Society of Edinburgh 101 (for 2010), 231–60.
Ramezani J., Hoke G. D., Fastovsky D. E., Bowring S. A., Therrien F., Dworkin S. I., Atchley S. C., and Nordt L. C. 2011. High-precision U-Pb zircon geochronology of the Late Triassic Chinle Formation, Petrified Forest National Park (Arizona, USA): Temporal constraints on the early evolution of dinosaurs. Geological Society of America Bulletin 123 (11–12), 2142–59.
Stocker M. R. 2010. A new taxon of phytosaur (Archosauria: Pseudosuchia) from the Norian (Late Triassic) Sonsela Member (Chinle Formation) in Arizona, and a critical re-evaluation of Leptosuchus Case, 1922. Palaeontology 53 (5), 9971022.
Stovall J. W. & Savage D. E. 1939. A phytosaur in Union County, New Mexico, with notes on the stratigraphy. Journal of Geology 47, 759–66.
Westphal K. W. 1979. Missing holotype Machaeroprosopus validus (Mehl, 1916). Journal of Paleontology 3, 741.
Woody D. T. 2006. Revised stratigraphy of the lower Chinle Formation (Upper Triassic) of Petrified Forest National Park, Arizona. Museum of Northern Arizona Bulletin 62, 1745.
Zeigler K. E., Lucas S. G. & Heckert A. B. 2002a. A phytosaur skull from the Upper Triassic Snyder Quarry (Petrified Forest Formation, Chinle Group of north-central New Mexico). In Heckert A. B. & Lucas S. G. (eds) Upper Triassic stratigraphy and paleontology. New Mexico Museum of Natural History and Science Bulletin 21, 171–77. Albuquerque: New Mexico Museum of Natural History and Science. 302 pp.
Zeigler K. E., Lucas S. G. & Heckert A. B. 2002b. The Late Triassic Canjilon Quarry (Upper Chinle Group, New Mexico) phytosaur skulls: evidence of sexual dimorphism in phytosaurs. In Heckert A. B. & Lucas S. G. (eds) Upper Triassic stratigraphy and paleontology. New Mexico Museum of Natural History and Science Bulletin 21, 179–88. Albuquerque: New Mexico Museum of Natural History and Science. 302 pp.
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Earth and Environmental Science Transactions of The Royal Society of Edinburgh
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  • EISSN: 1755-6929
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