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Holotype, male (Fig. 72a). Length 2.88 mm. Color ferruginous, pronotum and center of elytron black. Body subovate; in dorsal aspect with marked constriction between pronotum and elytron; in profile dorsally convex. Rostrum in apical half scabrous, coarsely punctate; in basal half with median and pair of submedian ridges; intervening furrows punctate; with sparse subrecumbent, piliform scales; epistome with transverse, angulate ridge forming indistinct median denticle. Pronotum with sides converging in straight line, anterolaterally rounded to subapical constriction; disk with pair of submedian depressions, coarsely punctate, reticulate; each puncture containing inconspicuous seta; with distinct median ridge. Elytra with striae indistinct; intervals flat, punctate; at base, laterally and subapically ferruginous, densely coarsely punctate, with scattered recumbent lanceolate scales; remainder less densely punctate, punctures in rows, black. Anteroventral ridge of femora distinct, in meso- and metafemur forming large tooth. Metafemur subapically with stridulatory patch. Dorsal edge of tibiae subbasally with angulation, in pro- and mesotibia with small tooth. Abdominal ventrite 5 flat, coarsely punctate. Penis (Fig. 72b) with sides of body subparallel; in apical 1/3 tapering to rounded apex; transfer apparatus compact; apodemes 2.3 × as long as body; ductus ejaculatorius with indistinct bulbus. Intraspecific variation. Length 2.38–2.98 mm. Color of specimens from Sesaot as in holotype; from other localities darker, body black, legs dark ferruginous, only antennae light ferruginous. Female body more slender. Female rostrum dorsally punctate-rugose, with median and pair of submedian subglabrous costae; epistome simple. Elytra with scales near base more or less distinct.
Holotype (MZB): ARC1482 (EMBL # LM655580), West Nusa Tenggara Prov., Lombok, Sesaot, Rinjani-trail, sample 4, S08°30.047', E116°13.826', 615 m, 28-III-2010. Paratypes (MZB, SMNK, ZSM): Lombok: 2 exx, ARC1481 (EMBL # LM655579), same data as holotype; 1 ex, ARC1484 (EMBL # LM655582), Sesaot, Rinjani-trail, sample 3, S08°29.841', E116°13.679', 625 m, 28-III-2010; 1 ex, ARC2301 (EMBL # LM655755), W Sengigi, Mt. Pusuk, sample 3, S08°27.723', E116°04.160', 585 m, 29-III-2011; 1 ex, ARC2285 (EMBL # LM655739), Sajang, sample 1, S08°19.370', E116°29.570', 845 m, 26-III-2011; 10 exx, ARC2295 (EMBL # LM655749), ARC2296 (EMBL # LM655750), ARC2297 (EMBL # LM655751), ARC2298 (EMBL # LM655752), Mt. Pengasingan, SE Sembalun, sample 2, S08°19.354', E116°30.530', 945 m, 27-III-2011.
West Nusa Tenggara Prov., Lombok (Mt. Pusuk, Sajang, Sembalun, Sesaot). Elevation: 615–945 m.
This epithet is based on the Sasak tribe traditionally inhabiting the island of Lombok. It is a noun in apposition.
Trigonopterus sasak Riedel, sp. n. was coded as “Trigonopterus sp. 330” by Tänzler et al. (2014). Cox1 sequences of the populations from West and East Lombok differ 9.7–10.6% p-distance, but morphologically no differences could be found.
- Riedel, A; Tänzler, R; Balke, M; Rahmadi, C; Suhardjono, Y; 2014: Ninety-eight new species of Trigonopterus weevils from Sundaland and the Lesser Sunda Islands ZooKeys, (467): 1-162. doi
- Tänzler R, Toussaint E, Suhardjono Y, Balke M, Riedel A (2014) Multiple transgressions of Wallace’s Line explain diversity of flightless Trigonopterus weevils on Bali. Proceedings of the Royal Society B: Biological Sciences 281: 20132528. doi: 10.1098/rspb.2013.2528