Holotype, male (Fig. 52a). Length 2.21 mm. Color of antennae and tarsi light ferruginous; remainder dark ferruginous to black. Body subovate; in dorsal aspect with marked constriction between pronotum and elytron; with distinct constriction in profile. Rostrum with median and pair of submedian ridges, most prominent at level of antennal insertion, anteriorly rather indistinct; with sparse rows of suberect scales; epistome at middle with dorsoposteriad directed acute denticle. Pronotum coarsely punctate-reticulate, each puncture with one clavate suberect scale; with indistinct subapical constriction. Elytra with striae deeply impressed, each with row of suberect clavate scales; intervals subcarinate, microreticulate. Metafemur subapically with stridulatory patch. Abdominal ventrite 5 flat, sparsely covered with small clavate scales. Penis (Fig. 52b) with sides of body in basal half subparallel, in apical half converging to subtruncate apex; ostium with large trapeziform sclerite; apodemes 1.8 × as long as body; transfer apparatus with subovate central fig and coiled spiniform transfer process; ductus ejaculatorius with distinct bulbus. Intraspecific variation. Length 2.13–2.21 mm. Female rostrum in basal half with median and pair of submedian ridges less prominent, but distinct; in apical half rugose-punctate; sparse scales recumbent; epistome simple.

Holotype (SMNK): ARC1440 (EMBL # LM655554), PHILIPPINES, Palawan, Puerto Princessa region, Sabang, Mt. Bloomfield, N10°11.62', E118°52.35', 500-700 m, 10-XII-2009. Paratypes (SMNK): 2 exx, ARC1441 (EMBL # LM655555), ARC1442 (PCR failed), same data as holotype.

Palawan (Mt. Bloomfield). Elevation: ca. 500–700 m.

This epithet is based on the type locality, the island of Palawan.

Trigonopterus palawanensis Riedel, sp. n. was coded as “Trigonopterus sp. 344”.