What does a grain bedbug look like? - briefly
The grain bedbug is a tiny, oval, wingless insect about 2‑3 mm long, reddish‑brown to dark brown, with a flattened dorsal surface, short antennae and three visible segments on each foreleg.
What does a grain bedbug look like? - in detail
The grain bedbug is a tiny, flattened beetle measuring 2–3 mm in length. Its body is oval and dorsoventrally compressed, allowing it to slip beneath grain kernels. The dorsal surface displays a uniform reddish‑brown hue, sometimes appearing slightly darker toward the head. The pronotum bears three shallow, longitudinal grooves and a saw‑toothed edge that gives the insect its common name. Four short, segmented antennae arise from the head, each consisting of eleven segments, and the eyes are absent. Three pairs of legs are positioned near the front of the abdomen; each leg ends in a small claw suited for gripping grain surfaces. The mouthparts form a slender, pierce‑sucking rostrum used to feed on stored products. The ventral side is lighter in color, with a smooth, hairless integument. No wings are present, and the beetle’s elytra fully cover the abdomen, meeting in a straight line along the midline. This combination of size, flattened shape, saw‑toothed pronotum, and lack of flight structures distinguishes the species from other stored‑product pests.