Trigonopterus lambirensis, Riedel, 2022

Riedel, Alexander, 2022, Nine new species of Trigonopterus Fauvel (Coleoptera, Curculionidae) from Sundaland, ZooKeys 1124, pp. 109-130 : 109

3. Trigonopterus lambirensis sp. nov.

Figs 3 , 11

Material examined.

Holotype (SMNS): ARC7269 (GenBank # OP078710 ), E-Malaysia, Sarawak, 20 km S Miri, Lambir Hill NP, 200 m, 17-18-VIII-2003, sifted . Paratype (SMNK): 1 ex, same data as holotype.

Diagnostic description.

Holotype, male (Fig. 3a ). Length 2.55 mm. Color of antennae light ferruginous; legs and elytra dark ferruginous; remainder almost black. Body in dorsal aspect subrotund, with constriction between pronotum and elytron; in profile dorsally convex. Rostrum with median ridge and pair of submedian ridges; median ridge in basal half distinct, terminating at level of antennal insertion; intervening furrows with rows of punctures and erect subclavate scales; epistome with subangulate ridge, at middle with denticle. Pronotum with disk densely coarsely punctate, interspaces reticulate; each puncture containing thin, recumbent seta. Elytra with striae distinct; punctures containing short recumbent seta hardly visible; basal margin bordered by transverse row; intervals flat; sutural interval with row of punctures, coarse near base, minute near apex; other intervals basally with interspersed punctures; stria 8 along humerus with regular punctures. Femora with simple anteroventral ridge. Metafemur with dorsoposterior edge denticulate; subapically with stridulatory patch. Dorsal edge of tibiae subbasally dentate, denticle acute in pro- and mesotibia, blunt in metatibia. Abdominal ventrites 1-2 forming deep common cavity, at middle concave, subglabrous, with sparse erect scales; laterally and posteriorly with distinct rim; abdominal ventrite 5 flat, with coarse punctures, with sparse erect scales. Penis (Fig. 3b ) with sides of body subparallel; apex rounded, with sparse setae; transfer apparatus flagelliform, ca. 2.0 × as long as body, coiled, with supporting sclerites; apodemes 1.9 × as long as body; ductus ejaculatorius without distinct bulbus. Intraspecific variation. Length 1.95-2.55 mm.

Distribution.

Sarawak (Lambir-Hills NP). Elevation: 200 m.

Etymology.

This epithet is a Latinized adjective based on Lambir-Hills NP.

Notes.

Trigonopterus lambirensis sp. nov. is coded as " Trigonopterus sp. 1246". Morphologically it appears related to T. microreticulatus Riedel, Trnka & Wahab sp. nov., from which it can be distinguished by the rather polished elytral intervals, the morphology of the penis and 20.9% p-distance of its cox1 sequence. A comprehensive molecular analysis will need to determine its phylogenetic position.

Figures

Figure 3. Trigonopterus lambirensis sp. nov., holotype a habitus b penis.

Figure 11. Map of other new Trigonopterus species. Prepared using GeoMapApp (www. geomapapp. org; Ryan et al. 2009); red = T. johorensis sp. nov., orange = T. lambirensis sp. nov., azure = T. linauensis sp. nov., magenta = T. microreticulatus Riedel, Trnka & Wahab sp. nov. = T. mulensis sp. nov., green = T. sarawakensis sp. nov.