Lagiacrusichthys macropinna, the longfin greeneye, is a species of pearleye and the only species in the genus Lagiacrusichthys. L. macropinna live between 0–840 m depth, usually 500 m. This species occurs in Antarctic waters. This species is the only known member of its genus.[1] The genus is named after the fictional monster Lagiacrus from the Monster Hunter video game series and franchise, as both are "rather ferocious coldwater predators" that inhabit the deep ocean.[2]