"Dinocephalosaurus" may also have used its neck to capture its prey via suction feeding. After flexing its neck to the side (which would have been facilitated by the slenderness of the cervical ribs), the act of straightening the neck would have caused the cervical ribs to splay outwards due to the action of the neck muscles attached to the ribs. As the head lunged forward, the volume of the esophagus would have increased, creating suction. Once the prey was caught, the fang-like teeth would have secured the prey in the mouth. Like other aquatic amniotes, "Dinocephalosaurus" would have swallowed and digested its prey head-first, as evidenced by the preservation of a perleidid fish in the abdominal region of LPV 30280 from Luoping.