TABLE 2 in The first cranium of Axestemys infernalis (Testudines: Trionychidae) from the Lance Formation of Wyoming, USA; an updated description and phylogenetic analysis

TABLE 2. Selected character variation between known crania of Axestemys species. CharacterA. infernalisA. splendidaA. montinsanaA. vittataSkull outlinetriangular to widetriangulartriangularwideTriturating surfacesmooth?rugosesmoothOrbit sizelargelargelargesmallJugal bar originlevel of orbitlevel of orbitlevel of orbitventral to orbitSkull roof sculpturingabsent or presentpresentpresentpresentVentral margin of maxillarounded or straightroundedhorizontalstraight slopeAnterior flange of quadrate inclinationoblique??near-horizontalOpening fppenclosed in palatinebetween palatine and maxilla?lateral to ascending process palatinePrefrontal - frontal suturevariablestraightstraighttriangularContribution of parietal to processus>20% trochlearis oticumreduced>20%?Maxilla deepyesyesyesyesPostorbital over complete length of postorbital baryesyesyesyesMaxillae form a secondary palatenononono