Apaturina is a monotypic genus of butterflies in the family Nymphalidae. Its sole species is Apaturina erminea, the turquoise emperor.
Apaturina erminea has a wingspan of about , and males measure marginally larger than females. The uppersides of the forewings are black with an iridescent blue-green base, two white small spots at the apex and a diagonal series of pale yellow patches across each wing. The uppersides of the hindwings are completely iridescent blue green in males, or chestnut brown in females, with an eyespot on each wing. The undersides are quite similar but the basic color is grayish brown, without iridescence.
The adults feed on various liquids, from rotting fruits and sap. The caterpillars feed on Celtis latifolia (Ulmaceae). Males are very fast flyers, but settle for long periods in trees, where they perch head down and wings closed, more than 7 m from the ground.
This species can be found in Indonesia (Aru Islands, Irian Jaya, Maluku), Papua New Guinea, Solomon Islands up to northern Australia. In Australia it is limited to lowland tropical rainforest in the Iron Range.