The evolution of Metriorhynchoidea (mesoeucrocodylia, thalattosuchia): an integrated approach using geometric morphometrics, analysis of disparity, and biomechanics Author Young, Mark T. Author Brusatte, Stephen L. Author Ruta, Marcello Author Andrade, Marco Brandalise De text Zoological Journal of the Linnean Society 2010 Zool. J. Linn. Soc. 2010-04-30 158 4 801 859 http://dx.doi.org/10.1111/j.1096-3642.2009.00571.x journal article 10.1111/j.1096-3642.2009.00571.x 0024-4082 5438508 PURRANISAURUS RUSCONI, 1948 Type species: Purranisaurus potens Rusconi, 1948 . Valid species: Purranisaurus casamiquelai (Gasparini & Chong, 1977) comb. nov. ; P. potens Rusconi, 1948 ; Purranisaurus westermanni (Gasparini, 1980) comb. nov. Geological range: Lower Callovian–lower Tithonian. Geographical range: South American endemic ( Argentina and Chile ). Emended diagnosis: Metriorhynchid thalattosuchian with less than 18 teeth per maxilla, and more than 20 teeth per dentary; all teeth lack carinae; lacks conspicuous ornamentation on the cranial bones; the antorbital fossa is elongate, narrow, and oriented obliquely, and is enclosed by the lacrimal, maxilla, and jugal; the antorbital pseudofenestra is enclosed by the lacrimal, nasal, and maxilla; the supratemporal arch in lateral view is straight; the internal nares opens out posteriorly into the buccal cavity, with the palatines creating an M-shape orientated anteriorly; the maxilla–palatine suture forms a broad U-shape orientated anteriorly; the parocciptal process terminates with a sharp incline dorsolaterally; the squamosal contributes less than 50% to the supratemporal arch.