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“Godzilla has traits that evolved multiple times among different groups of large carnivorous theropods, creating a strange dinosaurian mosaic. Not to mention all those radiation-spurred mutations.
Still, the monster’s anatomy holds enough clues to place him within a particular part of the dinosaur family tree. Godzilla’s long arms and four fingers on each hand indicate that the “Big Guy” is a basal theropod, or, in other words, belongs to one of the early branches of the group’s family tree. And even though the bony fins along Godzilla’s back are reminiscent of the herbivore Stegosaurus, Carpenter pointed out that some theropods–such as Ceratosaurus–had less-flashy bony armor along their spines. Perhaps the prominent ornaments on Godzilla were highly-modified versions of body armor that was more subtle among his ancestors.
More than anything else, though, Carpenter pointed to Godzilla’s head as the key to the mutant dinosaur’s identity. Godzilla has a short, deep skull reminiscent of a group of theropods called abelisaurids–dinosaurs such as Carnotaurus and Skorpiovenator that were cousins of Ceratosaurus. (In fact, the abelisaurids were a subgroup within the Ceratosauria.) Combined with the finger count and osteoderms, Carpenter noted, the creature’s skull suggests that Godzilla is some sort of ceratosaur–perhaps even a form that smooths the transition between more archaic ceratosaurs and the deep-skulled abelisaurids. Exactly how such a strange dinosaur survived to the modern era, and how radioactivity created such a monstrosity, are questions best left in movie mythology.” (Source: Smithsonian.com, What Kind of Dinosaur is Godzilla?)