ⓘ Sepidium magnum
Sepidium magnum can reach a body length of about 29–35 millimetres 1.1–1.4 in and a body width of about 12–15 millimetres 0.47–0.59 in. This species is among the largest of the genus. Body is brownish-black, while the head, prothorax, legs, and antennae show a pale fawn-coloured pubescence. Prothorax has a large prominent rounded tubercle. The surface of elytra is divided by two longitudinal sinuous carinse, with reticulating ridges on the sides.