Trigonopterus sasak Riedel

Riedel, Alexander, Taenzler, Rene, Balke, Michael, Rahmadi, Cahyo & Suhardjono, Yayuk R., 2014, Ninety-eight new species of Trigonopterus weevils from Sundaland and the Lesser Sunda Islands, ZooKeys 467, pp. 1-162 : 67-68

Taxon classification Animalia Coleoptera Curculionidae

72. Trigonopterus sasak Riedel sp. n.

Diagnostic description.

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.

Material examined.

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, ARC 1481 (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.

Distribution.

West Nusa Tenggara Prov., Lombok (Mt. Pusuk, Sajang, Sembalun, Sesaot). Elevation: 615-945 m.

Etymology.

This epithet is based on the Sasak tribe traditionally inhabiting the island of Lombok. It is a noun in apposition.

Notes.

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.