Tasmantrix nigrocornis is a moth of the family Micropterigidae. It is known from eastern Australia, in coastal rainforests of southern New South Wales from Mount Keira to Mount Dromedary.[1]
The forewing length is 3.4 mm for males.
The species name is derived from the Latin niger- (meaning black) and -cornis (meaning horned) with reference to the striking black antennae of this species.