The strongest of the Meganula species will pupate into a giant Meganulon. Rather than be on the offensive like its smaller kin, this giant version of the ancient insect will remain stationary. It relies on the smaller, drone Meganula to steal enough energy to power the creature for its metamorphosis.
During the Meganula attack on Japan, the giant Meganulon made base in a submerged Tokyo. The mammoth insect stayed at the bottom of the water, hidden, as its brood attacked above the surface. The smaller Meganula performed well, locating and attacking Godzilla. Sapping energy from an almost limitless source, the Meganula fled with the energy they stole. Depositing it into the giant Meganulon, the smaller insects gave their life to power the queen of the hive.
Rather than transform into a giant Meganula, though, something else occurred. The husk of the beast was discarded as a new creature was born. Gone were its pincer mouth, replaced with a jagged series of teeth. By using Godzilla as the source, the smaller Meganula gave birth to a mutated version of their species. A flying killer who now threatened all of Japan.