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Taxonomic status of phytosaur Machaeroprosopus

From: Ben Creisler

William G. Parker, Axel Hungerbühler and Jeffrey W. Martz (2013)
The taxonomic status of the phytosaurs (Archosauriformes)
Machaeroprosopus and Pseudopalatus from the Late Triassic of the
western United States.
Earth and Environmental Science Transactions of the Royal Society of
Edinburgh (advance online publication)
DOI: http://dx.doi.org/10.1017/S1755691013000339

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.