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

Published online by Cambridge University Press:  25 September 2013

William G. Parker
Affiliation:
P.O. Box 2217, Petrified Forest National Park, Petrified Forest, AZ 86028, USA. Email: William_Parker@nps.gov Department of Geological Sciences, The University of Texas at Austin, Austin, TX 78712, USA
Axel Hungerbühler
Affiliation:
Mesalands Community College, Tucumcari, NM 88401, USA
Jeffrey W. Martz
Affiliation:
Denver Museum of Nature and Science, Denver, CO 80205, USA
Corresponding
E-mail address:

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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Copyright © The Royal Society of Edinburgh 2013 

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