Tetraopes discoideus is a species of beetle in the family Cerambycidae. It was described by John Lawrence LeConte in 1847. It is known from Mexico and the United States.
T. discoideus is significantly smaller than other members of its genus, typically measuring between 7âÂÂ9 mm in length.
Adults are typically active for about one month, spending their time resting, feeding, and mating on milkweed plants. Larvae develop by feeding on the roots of the host plant; in species with small roots, they live in the surrounding soil, while in those with large taproots, they may tunnel directly into the root.