What is "megaguirus"

is a kaiju who first appeared in Toho's 2000 film Godzilla vs. Megaguirus. A mutated version of the fictional meganulon, Megaguirus is regarded as the queen of the species; according to Toho, she is 50 meters (164 feet) long, has a wingspan of 80 meters (262 feet) and weighs 12,000 metric tons (13,227 short tons). The first and only major appearance of the creature was in the 2000 film Godzilla vs. Megaguirus, she also had a brief cameo appearance in Godzilla: Final Wars from 2004.