Deuterious (デューテリオス is an unused Dyūteriosu)kaiju from the unmade original draft of the 1989 Godzilla film, Godzilla vs. Biollante.
Although no official source has given the etymology behind Deuterious's name, its Japanese spelling Dyūteriosu (デューテリオス) is highly similar to that of the chemical deuterium: dyūteriumu (デューテリウム). Deuterium is a rare isotope of hydrogen which features one proton and one neutron instead of the single proton and lack of neutrons found in normal hydrogen nuclei, which is fitting given Deuterious is comprised of parts from two separate organisms to create a hybrid chimera.
Deuterious resembles a cross between a rat and various fish. He has a long, whip like tail and extended ears which appear to display gills on them, large tusks, and a horn protruding from its head. For a creature that was adapted to living in water, Deuterious appears to have retained its long fur. In some concept art, Deuterious appears to have fins in place of forelimbs, allowing him to swim. The horn on his head also resembles an angler fish's antenna in this artwork, while his eyes are very large and pupil-less, similar to fish eyes.
Godzilla vs. Biollante
Godzilla was going to fight Deuterious instead of the Super X2 and the rose form of Biollante. After prevailing, Godzilla would have consumed the monster. The monster was possibly dropped due to the graphic nature of this scene, or simply to make room for another battle with Biollante and the Super X2.
Concept art of Deuterious in Godzilla vs. Biollante Completion
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