Mycotretus duodecimguttatus is a species of beetle of the Erotylidae family. This species is found in southern, northern and southeastern Brazil, Colombia and Peru.

Subspecies Mycotretus duodecimguttatus duodecimguttatus (Brazil, Colombia and Peru) Mycotretus duodecimguttatus consociatus (Kuhnt, 1910) (Colombia)

References