This species was previously considered a synonym of Coptodryasdentipennis (= M.exsculptus) by Bright and Skidmore (1997: 165). The holotypes of Xyleborusspicatulus and X.dentipennis (NHML) and further specimens in NHML and RAB, and images of the M.exsculptus lectotype (NMNH), have been compared by RAB, and X.spicatulus was found to be distinct. It is here recognized as a distinct species and transferred to Microperus based on the generic characters given for M.armaticeps. Microperusspicatulus can be distinguished from M.exsculptus by the following combination of characters (M.spicatulus given first): body elongate 3.0–3.1× as long as wide, vs. 2.1–2.2×; larger size (2.2–2.4 mm vs. 1.85–2.0 mm); elytral disc without a discal depression vs. with a discal depression; the number of teeth on each declivital margin 3–5 vs. 7–8.

[Indonesia]: Sumatra, ex Dipterocarpuss. [no further data] [1 specimen in NHML determined by F. G. Browne as Xyleborusdentipennis Browne, but not that species.] Laos: Sekong prov. ca. 12 km S Seking, Tao Faek waterfalls, 15°14.7'N, 106°45.1'E, 118 m, at light, 8–12.v.2010, J. Hájek (1) (RABC).

Indonesia (Sumatra), Laos, East Malaysia (Sabah).