Trigonopterus cupreus is a species of flightless weevil in the genus Trigonopterus from Indonesia.[1]
The specific name is derived from the Latin word cupreus, meaning "copper-colored".
Individuals measure around 2.43–3.05 mm in length. The head, legs, and ventral surface are rust colored, and the elytra are a reddish-copper color. The pronotum can either be reddish-copper like the elytra, or it can be bronze or green.
The species is found around elevations of 1305m–1350mm (4,281feet–4,430feetm) in Batu Dulang and Tepal on the island of Sumbawa, part of the Indonesian province of West Nusa Tenggara.
T. cupreus is part of the T. dimorphus species group.