2 to 3.7 mm long.
Cylindrical, oblong body, covered in a pubescence of very fine flat bristles.
Sharply domed thorax, wider on the sides, with a finely grainy, thickly pubescent surface, like the upper part of the elytra; elytra are ornamented with rows of lengthwise pits (striations).
Eleven-articled antennae, the last 3 articles form an elongate club (antennae are serrate and club-less in Lasioderma serricorne (see fact-sheet)).
Two rows of small spines (spinulae) on the ventral face of the first 6 abdominal segments.
Head partly covered by the pronotum which forms a kind of hood.
Entirely yellowish brown to deep dark brown, legs included.
Yellowish to greyish dorsal pubescence.