The squamosal, the element at the front of the frill side, is large with a continuously curving instead of a stepped edge.
42.
They further concluded that the genus had most of the synapomorphies common to Sphenosuchia, lacking only the forked posterior process of the squamosal.
43.
Mammalian jaw structures are also set apart by the dentary-squamosal cranium called the quadrate bone to form the articular-quadrate jaw joint.
44.
However, in 1968 Alfred Sherwood Romer stated that the presumed supratemporal was in fact the squamosal, which was in 1973 confirmed by McGowan.
45.
A raised area at the base of the squamosal divides it into two equal halves, whereas more derived species have an enlarged top part.
46.
The squamosal has, measured along the outer curve, a length of fifty-seven centimetres and a width of thirty-eight centimetres.
47.
The squamosal bone lacks a suspensory process that contacts the tegmen tympani, the roof of the tympanic cavity, a defining character of oryzomyines.
48.
The squamosal bones arch around to form the curved back of the skull, and bear a ridge on top for attachment of neck muscles.
49.
Evidence for a tympanum is seen in a ridge that runs along the squamosal notch, which may have been an attachment point for the membrane.
50.
However, " Tarchia " itself has also a unique squamosal horn configuration in that an accessory osteoderm is present in front of it.
