A new ornithopod (Dinosauria; Ornithischia) from Antarctica

► We describe a new Ornithopoda dinosaur from Antarctica, Trinisaura santamartaensis. ► Trinisaura increases our knowledge about the Antarctic dinosaur diversity. ► Trinisaura is the first Ornithopoda species identified from the Snow Hill Island Formation. ► Trinisaura and other Ornithopoda reports suggest predominance of this group in Antarctica.