The parabasisphenoid bone at the bottom of the braincase has a semilunar depression like that of Venaticosuchus, but the gap between its basipterygoid processes and basitubera is less acute than in that taxon. Dynamosuchus's basipterygoid processes are also more closely spaced and pointed further rearwards compared to Venaticosuchus. The surangular is similar to that of Riojasuchus, with a pronounced blade-like crest on its outer surface and a large hole (a surangular foramen) at the rear of the jaw. The jaw as a whole deepens towards the chin and has a long mandibular fenestra.
