%0 Journal Article %T Reevaluation of the holotype of Plesiosaurus (Polyptychodon) mexicanus Wieland, 1910 from the ?Upper Jurassic of Mexico: a thalattosuchian, not a sauropterygian %A Buchy %A Marie-C¨¦line %J Revista mexicana de ciencias geol¨®gicas %D 2008 %I Universidad Nacional Aut¨®noma de M¨¦xico %X the holotype of the first sauropterygian described from mexico, plesiosaurus mexicanus wieland, 1910, was recently rediscovered and is here described and discussed for the first time in almost a century. the holotype specimen belongs to an indeterminate metriorhynchine crocodyliform. doubts remain as to the stratigraphic origin of the specimen, whether upper jurassic or lower cretaceous. it adds a specimen to the recently recognised wealth of the mexican gulf in thalattosuchians. %K thalattosuchia %K metriorhynchinae %K late jurassic %K early cretaceous %K mexico. %U http://www.scielo.org.mx/scielo.php?script=sci_abstract&pid=S1026-87742008000300010&lng=en&nrm=iso&tlng=en