William Buckland formally announces the name Megalosaurus, the first scientifically validly named non-avian dinosaur species.

William Buckland DD, FRS was an English theologian, geologist and palaeontologist.

Megalosaurus is an extinct genus of large carnivorous theropod dinosaurs of the Middle Jurassic Epoch of southern England. Although fossils from other areas have been assigned to the genus, the only certain remains of Megalosaurus come from Oxfordshire and date to the late Middle Jurassic.

February 20 is the 51st day of the year in the Gregorian calendar; 314 days remain until the end of the year.