Trigonopterus signicollis 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 : 68-69

77. Trigonopterus signicollis Riedel sp. n.

Diagnostic description.

Holotype, male (Fig. 77a). Length 1.79 mm. Color black; legs and apex of pronotum deep ferruginous; antenna and tarsi light ferruginous. Body subglobose; in dorsal aspect and in profile with distinct constriction between pronotum and elytron. Rostrum in basal half with 3 ridges posteriorly continued to and uniting on forehead; subapically scabrous; epistome forming curved, transverse ridge. Pronotum deeply sculptured; with marked subapical constriction, apical collar and lateral costate flanges punctate, sparsely setose; transversely ovate disk swollen, glabrous except medially with few punctures. Elytra subglabrous, on disk striae deeply incised, intervals costate, towards sides and near apex with deep punctures; intervals 3, 5, and 6 more prominent; apex extended ventrad, beak-shaped; lateral interval subapically with row of setae. Meso- and metafemur weakly dentate. Metafemur with weakly denticulate dorsoposterior edge, subapically without stridulatory patch. Aedeagus (Fig. 77b) with apex medially pointed; body in apical half with broad depression visible in lateral aspect; transfer apparatus markedly asymmetrical, flagelliform, curled, pointing laterad; ductus ejaculatorius with bulbus. Intraspecific variation. Length 1.71-2.03 mm. Female rostrum in apical half dorsally flattened, subglabrous, with sparse punctures; epistome simple.

Material examined.

Holotype (MZB): ARC0553 (EMBL # FN429259), WEST NEW GUINEA, Jayapura Reg., Cyclops Mts, Sentani, S02°31.383', E140°30.490', 1275 m, 30-XI-2007, sifted. Paratypes (ARC, SMNK, ZSM): WEST NEW GUINEA, Jayapura Reg., Cyclops Mts, Sentani: 2 exx, same data as holotype; 2 exx, ARC0560 (EMBL # FN429266), ARC0561 (EMBL # FN429267), S02°31.425', E140°30.474', 1265 m, 30-XI-2007, sifted; 2 exx, S02°31.281', E140°30.535', 1420 m, 30-XI-2007, sifted; 3 exx, ARC0682 (EMBL # FN429327), ARC0683 (EMBL # FN429328), S02°31.182', E140°30.542', 1510 m, 30-XI-2007, sifted; 1 ex, 1320 m, 23-XII-2004.

Distribution.

Jayapura Reg. (Cyclops Mts). Elevation: 1265-1510 m.

Biology.

Sifted from leaf litter in montane forest.

Etymology.

This epithet is based on a combination of the Latin nouns signum (mark, seal) and collum (neck, pronotum) and refers to the distinct, central portion of the pronotal disk.

Notes.

Trigonopterus signicollis Riedel, sp. n. was coded as " Trigonopterus sp. 38" by Riedel et al. (2010) and Tänzler et al. (2012), respectively " Trigonopterus spal" in the EMBL/GenBank/DDBJ databases.