Holotype, male (Fig. 65a). Length 2.18 mm. Color of antennae, tarsi and sutural interval ferruginous; remainder black. Body subovate, in dorsal aspect and in profile with weak constriction between pronotum and elytron. Rostrum with median ridge and pair of indistinct submedian ridges, intervening furrows each with sparse row of mesad directed setae; anterior third scabrous; epistome with transverse ridge. Pronotum coarsely punctate, laterally reticulate, submedially interspaces longitudinally rugose, with median costa; with sparse, suberect, slender scales. Elytra with striae deeply impressed; each with row of small suberect scales; intervals costate, subglabrous; intervals 1, 3, 5 more distinctly swollen, each with row of punctures; suture incised, bordered by dense rows of punctures. Femora with simple, crenate anteroventral ridge. Metafemur subapically with stridulatory patch. Metatibia apically with uncus, without premucro. Abdominal ventrite 5 coarsely punctate, with sparse suberect scales; with median carina. Penis (Fig. 65b) at middle with distinct constriction; containing several sclerites; apex subangulate, with sparse short setae, median extension minute; transfer apparatus compact, symmetrical, with two pairs of tendons attached; transfer process spiniform, pointing ventrad; apodemes 2.3 × as long as body; ductus ejaculatorius without bulbus. Intraspecific variation. Length 2.18–2.41 mm. Color of sutural interval ferruginous or darker, almost black. Female rostrum in apical half dorsally subglabrous, punctate; epistome simple. Female abdominal ventrite 5 flat.

Holotype (MZB): ARC2263 (EMBL # LM655717), West Nusa Tenggara Prov., Lombok, Gn. Rinjani, Senaru, Rinjani-track, sample 3, S08°20.780', E116°23.790', 1465 m, 21-III-2011. Paratypes (MZB, SMNK, ZSM): West Nusa Tenggara Prov., Lombok, Gn. Rinjani: 2 exx, ARC2264 (EMBL # LM655718), same data as holotype; 2 exx, ARC1464 (EMBL # LM655562), ARC1465 (EMBL # LM655563), Tetebatu, Rinjani-trail from Orong Gerisak, sample 8, S08°29.173', E116°24.517', 1345 m, 04-IV-2010; 1 ex, ARC1469 (EMBL # LM655567), Tetebatu, Rinjani-trail from Orong Gerisak, sample 7, S08°29.433', E116°24.746', 1240 m, 04-IV-2010; 1 ex, ARC1470 (EMBL # LM655568), Tetebatu, Rinjani-trail from Kokok Belimbing, sample 3, S08°29.433', E116°24.746', 1245 m, 02-IV-2010; 1 ex, ARC1473 (EMBL # LM655571), Tetebatu, Rinjani-trail from Kokok Belimbing, sample 4, S08°28.320', E116°26.459', 1420 m, 02-IV-2010; 5 exx, ARC0167, Tetebatu, Rinjani-trail, 1200-1450 m, 07-XII-2004; ARC1487 (EMBL # LM655585), road between Sembalun and Sapit, sample 1, S08°25.110', E116°31.947', 1450 m, 30-III-2010; 1 ex, ARC1489 (EMBL # LM655587), road between Sembalun and Sapit, sample 4, S08°25.331', E116°31.841', 1405 m, 31-III-2010; 1 ex, ARC1492 (EMBL # LM655590), road between Sembalun and Sapit, sample 5, S08°26.453', E116°31.859', 1195 m, 31-III-2010.

West Nusa Tenggara Prov., Lombok (Senaru, Sembalun, Tetebatu). Elevation: 1195–1465 m.

This epithet is based on the type locality, Mt. Rinjani.

Trigonopterus rinjaniensis Riedel, sp. n. was coded as “Trigonopterus sp. 282” by Tänzler et al. (2014).