Atopodentatus unicus

Atopodentatus unicus cruised shallow, sunlit Triassic seas, using an unusual hammerhead-shaped rostrum lined with hundreds of fine, needle-like teeth to scrape benthic algae from submerged rock surfaces. Its discovery fundamentally revised paleontological understanding of Mesozoic marine ecosystems, proving that specialized marine reptile herbivory evolved just six million years after the catastrophic end-Permian extinction. Sturdy paddle-like limbs and dense, pachyostotic ribs provided neutral buoyancy and ballast, helping this distinctive grazer steady itself against currents while feeding along the seafloor.