Trigonopterus nangiorum Riedel

Riedel, Alexander, Sagata, Katayo, Surbakti, Suriani, Rene Taenzler, & Michael Balke,, 2013, One hundred and one new species of Trigonopterus weevils from New Guinea, ZooKeys 280, pp. 1-150 : 50-51

55. Trigonopterus nangiorum Riedel sp. n.

Diagnostic description.

Holotype, male (Fig. 55a). Length 3.17 mm. Color black; antenna and tarsi ferruginous. Body subovate; with distinct constriction between pronotum and elytron; in profile evenly convex. Rostrum dorsally with median and pair of submedian ridges, furrows with sparse rows of setae; subapically sparsely punctate. Pronotum densely punctate; interspaces dull, microgranulate; with indistinct lateral edges converging in straight line to shortly before apex. Elytra densely punctate; striae distinct, marked by fine lines and rows of small punctures; intervals with row of minute punctures; laterally behind humeri with dense row of deep punctures of stria 9. Femora edentate. Mesofemur and metafemur dorsally with sparse yellowish lanceolate scales. Metafemur with denticulate dorsoposterior edge; subapically with stridulatory patch. Metatibia apically with uncus and distinct premucro. Procoxa ventrally with dense patch of long erect setae. Posteroventral rim of mesoventral receptacle densely setose with long erect setae. Abdominal ventrite 5 with distinct impression, densely punctate. Aedeagus (Fig. 55b) with sides subparallel, apically rounded with median nipple-shaped extension, sparsely setose; body dorsally with patches of long setae; transfer-apparatus flagelliform; ductus ejaculatorius with bulbus. Intraspecific variation. Length 2.69-3.17 mm. Female rostrum in apical half dorsally with sculpture shallower than in males. Male pronotum anteriorly subangularly projecting, in females rather rounded. Female mesoventral receptacle with posteroventral rim subglabrous. Female abdominal ventrite 5 flat, subglabrous, sparsely punctate.

Material examined.

Holotype (SMNK): ARC1865 (EMBL # HE616142), PAPUA NEW GUINEA, Eastern Highlands Prov., Aiyura, S06°21.033', E145°54.597', 2169 m, 06-II-2010. Paratypes (NAIC, SMNK, ZSM): PAPUA NEW GUINEA, Eastern Highlands Prov.: 10 exx, ARC1866 (EMBL # HE616143), ARC1867 (EMBL # HE616144), same data as holotype; 2 exx, ARC0351 (EMBL # HE615164), ARC0352 (EMBL # HE615165), Aiyura, S06°21.131', E145°54.398', 1670 m, 05-IV-2006.

Distribution.

Eastern Highlands Prov. (Aiyura). Elevation: 1670-2169 m.

Biology.

Beaten from foliage of montane forests.

Etymology.

This species is dedicated to the people of Papua New Guinea. The epithet is based on the family name Nagi, found on page 280 of the Papua New Guinea Telephone Directory of 2010 and treated in genitive plural.

Notes.

Trigonopterus nangiorum Riedel, sp. n. was coded as " Trigonopterus sp. 175" by Tänzler et al. (2012).