rugata (AMEGHINO, 1901) in having antero-dorsally inclined presacral and sacral diapophyses, squamosal not ventrally oriented, and more gracile and delicate premaxilla (see BAEZ, 1977).
satan the sacral diapophyses dialted, a condition that is present in calyptocephalellids and ceratophryids (see REIG, 1960a,b; LYNCH, 1971).
gayi) by a unique combination of characters, including subhorizontally oriented diapophyses on presacral and sacral vertebrae, presacral diapophyses not posteriorly oriented, robust neural spines, lateral margin of squamosal ventrally oriented, esphenethmoid with anterolateral osseous ridges, robust and dorsoventrally tall premaxilla, and pterigoid process of maxilla medially expanded (see BAEZ, 1977).
LYNCH (1971) included Indobatrachus within myobatrachids because of the shared presence of bicotylar coccyx, dilated sacral diapophyses, shortened transverse processes of the presacral vertebrae, and possibly free intervertebral discs.
In these vertebrae the parapophyses are not located in the vertebral centrum and they are located dorsally between the prezygapophyses and the diapophyses, moving laterally toward the lateral tip of the diapophyses in the posterior thoracic region.
This vertebra is also characterized by the presence of long and flat diapophyses almost in the horizontal plane, but it is slightly ventrally inclined.