Trigonocyttara clandestina is a moth in the Psychidae family, and the only species in the genus Trigonocyttara. It is found in Australia, where it has been recorded from southern Queensland to Victoria. The larvae feed on various trees and shrubs, including Eucalyptus, Callistemon and Acacia species, as well as Pinus radiata. They create a cylindrical larval case, with one or two twigs attached to it.