The composite term Gojirasaurus is derivied from the name of the giant Japanese movie monster "Gojira" (Godzilla) and the Greek word "sauros" (σαυρος) meaning "lizard"; thus, "Gojira lizard". "Gojira" was selected as a reference to the great size of this theropod, which exceeded that of its Triassic counterparts. The specific name "quayi", is a reference to Quay County, New Mexico, where the holotype specimen was discovered. Gojirasaurus was described and named by Kenneth Carpenter in 1997 and the type species is Gojirasaurus quayi.
Gojirasaurus is one of the largest meat-eating dinosaurs known from the Triassic Period, almost the size of its relative, the large coelophysoid, Dilophosaurus.The size of its tibia was 469 mm, which was comparable to that of Liliensternus (409 mm) and Dilophosaurus (555 mm), suggesting that it was a large dinosaur, estimated to be about 5.5 m (18 ft) long, which can be extrapolated to a weight of approximately 150–200 kg (330–440 lb). Carpenter (1997) pointed to features of the pelvis and ankle suggesting that this was an immature individual, and could therefore have grown to even a larger size in maturity Specimen NMMNH P-4666 which consists of only a pubis, was referred to this genus by Hunt in 1994.
In 1994 Hunt, in his unpublished thesis, described and named this material "Revueltoraptor lucasi" which is now considered a nomen nudum. Carpenter officially described and named UCM 47221, Gojirasaurus quayi in 1997 and classified it as a coelophysoid. The original remains attributed to this dinosaur included a serrated tooth, a cervical rib, two anterior dorsal ribs, one posterior dorsal rib, a right scapula, two gastralia, four vertebrae, one anterior chevron, a right pubis, a left tibia, and one metatarsal.Tykoski and Rowe (2004) and later Carrano et al. (2005) agreed that Gojirasaurus is more derived than Dilophosaurus However, later study by Nesbitt et al. (2007) showed that the vertebrae actually belonged to the rauisuchian Shuvosaurus, and the pubis and tibia belonged to another coelophysoid, indistinguishable from the contemporary Coelophysis, making Gojirasaurus's status as a valid genus dubious.
Distinguishing anatomical features
A diagnosis is a statement of the anatomical features of an organism (or group) that collectively distinguish it from all other organisms. Some, but not all, of the features in a diagnosis are also autapomorphies. An autapomorphy is a distinctive anatomical feature that is unique to a given organism or group.
According to Nesbitt et al. (2007) Gojirasaurus can be distinguished based on the fact that its tibia is more robust than that of its relative Coelophysis. Mortimer (2012) has proposed that the observed difference in the leg bone might be just size-related, and not a true apomorphy. Rahaut (2003) attempted to diagnose this genus based on the fact that the mid/posterior dorsal vertebrae had taller neural spines than those observed in other coelophysoids. However, the reassignment of the dorsal vertebrae on which the diagnosis was based would render it invalid.
The only known specimen of Gojirasaurus was discovered in the Cooper Canyon Formation of the Dockum Group near Revuelto Creek, Quay County, in New Mexico. This genus was discovered in 1981, in gray carbonaceous mudstone deposited during the Norian stage of the Late Triassic, which based on magnetostratigraphy, was approximately 228 to 208 million years ago. This specimen is housed in the collection of the University of Colorado Museum, in Boulder, Colorado. Gojirasaurus's assignment to the Coelophysoidea, would suggest that it was a bipedal, terrestrial, actively mobile carnivore. Contemporaries of Gojirasaurus included the pseudosuchian Shuvosaurus, and the phytosaur Rutiodon.