Stanocephalosaurus also has a long, triangular skull which is much longer than broad, and has an elongated preorbital region continuously narrowing anteriorly to an obtuse rounded snout.

Air pockets around the stapes of Stanocephalosaurus have been hypothesized to act as resonance chambers, meaning that the spoon-shaped inner ear bone could be related to underwater hearing.

[8] The narrow head and elongated snout of Stanocephalosaurus suggests that stress levels during biting are slightly higher than temnospondyls with a wider and shorter skull.

[9] The vertebrae of Stanocephalosaurus are rhachitomous, with a neural arch and a bipartite centrum that is divided into a large, unpaired wedge-shaped intercentrum and smaller paired pleurocentra.

In anterior and posterior views, the intercentrum is a dorsally half-ring, surrounding the persistent notochord from ventral and lateral sides.

[10] Another well-known mastodonsaurid in terms of fossil knowledge is Mastodonsaurus, notably from numerous skull specimens found in Germany.

The small distortion of the head can be overlooked, and the complete preservation of the skull and jaws makes its shape certain at a length of 60 cm.

The right corner of the head is essentially undistorted and shows that the skull at its point of greatest depth is almost exactly as high as the lower jaw.

Its skull is characterized by the small tabular without any trace of a "horn", but with a round lappet that approaches the squamosal flange lateral to the tympanic membrane, failing to meet it by about its own width.

The skull also has a small internasal vacuity between the dorsal processes of the premaxillae and lateral lines are often shown as continuous grooves with well-defined borders.

A deep groove on the maxilla begins immediately behind and lateral to the nostril and passes straight back to the lachrymal, on which bone it turns outward and forward and ends abruptly.

The supraorbital groove begins abruptly on the dorsal surface of the premaxilla, immediately passes on to the nasal, and extends back on that bone close to its suture with the lachrymal.

Contrary to related forms like Mastodonsaurus and Stanocephalosaurus, the tusks of the lower jaw were of moderate size and did not penetrate the premaxilla.

Some evidences, including the fossils of some smaller temnospondyls bear tooth marks made by mastodonsaurid-like animals.