Hosffstetter (1955), Kuhn (1966), Reig (1970) and Bonaparte (1971) hypothesized it to be synonymous with Cerritosaurus, but other characteristics suggest it is closer to Chanaresuchus and Gualosuchus, while it is certainly different from Proterochampsa and Barberenachampsa.

[3] The skull of Rhadinosuchus had an estimated length of 11.0 centimeters (4.3 inches), with missing portions reconstructed based on its relative Chanaresuchus.

The lower front corner of this hole has a thin basin (an antorbital fossa) edge by a ridge on both processes.

Preserved teeth were typical of other archosauriformes, as they were curved, serrated, and set in deep sockets.

It was textured by several longitudinal ridges which converge at a point near the rear of the bone, as in Chanaresuchus, Gualosuchus, and Pseudochampsa.

The front tip of the jaw has a large pit, which is autapomorphic (unique) to Rhadinosuchus compared to other archosauriforms.

In addition, Rhadinosuchus had a larger number of teeth in the lower jaw (23) compared to other proterochampsids (15-18), but fewer than Doswellia (35).

This centrum was long and low, with a keel on its lower edge and no evidence of bevelled facets for intercentra.

They may have formed a single row along the midline of the animal's back (based on other proterochampsids), but this interpretation cannot be confirmed or denied in Rhadinosuchus, as they were displaced from the rest of the bones.