See text Nacaduba cyanea, the tailed green-banded line-blue, is a species of butterfly in the family Lycaenidae, and formerly considered a member of the genus Danis.

It is found in the Indonesia (Irian Jaya, Maluku), Papua New Guinea, the Solomon Islands and Australia (Queensland).

They are bright green, with pale brown heads.

The larvae are attended to by ants of the genus Anonychomyrma.

Pupation takes place in a brown pupa with dark markings.