"Dinocephalosaurus" represents the climax of aquatic adaptations among the protorosaurs. Given its long neck and paddle-like limbs, it was probably incapable of functioning comfortably in a terrestrial environment. One consequence of these adaptations is that "Dinocephalosaurus" would have been incapable of building nests on land. This would also have prevented it from possessing hard-shelled reptilian eggs; such eggs necessitate the exchange of gases with the outside environment, and this process is significantly slower in water than it is in air. Thus, "Dinocephalosaurus" could not have been oviparous. At the same time, however, archosaurs are known for the total absence of viviparous, or live birth, among its living members.