Adults are bright green, range in length from 8.25 to 10.4 mm (0.325 to 0.409 in), and have pointed humeri (shoulders).

[3] The first and second instar nymphs are much smaller, primarily black and white, with some patches of red or brown.

Similar to other pentatomids, Cuspicona simplex progresses through five juvenile stages called nymphs, and finally to adult.

Adults overwinter on the base of plants or in loose soil until late spring, when they aggregate to mate and lay eggs.

[8][9][10] The first, Trissolcus basalis, is a biocontrol agent introduced in Australia and New Zealand against green vegetable bug (Nezara viridula).