Marine reptiles called omphalosaurids helped pelagic ecosystems recover quickly after a mass extinction. A new fossil found in China shows these reptiles had special jaws for eating hard-shelled sea creatures like ammonoids. The discovery suggests omphalosaurids were like marine turtles in how they fed. This finding adds to the evidence that marine reptiles rapidly spread in the ocean in the Early Triassic, helping ecosystems bounce back after the extinction event.