Anguirus (アンギラス, 'Angirasu') is a mutated ankylosaurus, and the second daikaiju to appear in a Toho film. He is the first monster Godzilla ever battles. He is also referred to as Anguilas and Angorous.
Anguirus is a big pal of Godzilla and he has fought various monsters with him. He has a spiky shell, tail, has a spike on his nose and a group of spikes on his forehead that resemble a crown. He can roll into a ball like an armadillo, since he does not have "Special Abilities", he uses his claws, many spikes and speed against his opponents.
Anguirus appears with Mothra Leo, King Caesar, Rodan, Mothra and Baragon a few moments after Godzilla joins the Heroes, some of them do not trust the heroes at first, and have to be defeated by the monsters that trust the Heroes. Most noticeably, Godzilla. Anguirus does not trust the heroes, so he has to be convinced.