Trigonopterus linauensis, Riedel, 2022

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

4. Trigonopterus linauensis sp. nov.

Figs 4 , 11

Material examined.

Holotype (SMNK): ARC1453 (GenBank # OP078704 ), E-Malaysia, Sarawak, Belaga , Long Linau, logging camp, ca. 02°45'N, 113°46'E, ca. 400 m, 19-III-1990 . Paratypes (ARC in SMNK): 2 exx, same data as holotype.

Diagnostic description.

Holotype, male (Fig. 4a ). Length 2.28 mm. Color ferruginous, pronotum somewhat darker. Body in dorsal aspect subrhomboid, with weak constriction between pronotum and elytron; in profile dorsally convex, calli at elytral base weakly projecting from outline. Rostrum with median and pair of submedian ridges; intervening furrows with rows of punctures and sparse suberect scales; epistome with indistinct subangulate ridge. Pronotum with disk densely coarsely punctate, reticulate; each puncture containing suberect seta. Elytra with striae marked by hairlines and rows of punctures each containing minute seta; intervals flat, subglabrous, with interspersed punctures, weakly coriaceous; sutural interval at base with glabrous callus. Femora with weakly crenate anteroventral ridge, ending in apical third with small blunt tooth in pro- and metafemur, with minute acute tooth in mesofemur. Profemur in basal third with denticulate posteroventral ridge. Metafemur subapically with stridulatory patch. Dorsal edge of tibiae subbasally dentate, in pro- and mesotibia denticle acute, in metatibia blunt. Abdominal ventrites 1-2 forming deep common cavity, at middle concave, subglabrous, with sparse erect clavate scales; laterally and posteriorly with distinct rim; lateral rim of ventrites 1 and 2 in profile projecting dentiform; abdominal ventrite 5 medially with marked longitudinal impression delimited by distinct ridges, laterally punctate; median depression glabrous, midline with indistinct ridge. Penis (Fig. 4b ) with sides of body subparallel, in apical third with narrow lateral flanges; with complex endophallic scle-rites; apex with shallow median incision, with sparse setae; transfer apparatus spiniform, fitted into supporting sclerites; apodemes 1.9 × as long as body; ductus ejaculatorius with indistinct bulbus. Intraspecific variation. Length 2.15-2.28 mm. Female unknown.

Distribution.

Sarawak (Belaga). Elevation: ca. 400 m.

Etymology.

This epithet is a Latinized adjective based on the type locality Long Linau.

Notes.

Trigonopterus linauensis sp. nov. is coded as " Trigonopterus sp. 1123". This was the first species of Trigonopterus that I personally collected. At the time, I did not fully appreciate the scientific value of the specimens. This species belongs to the T. attenboroughi group. It is closely related to T. sepuluh Riedel, 2014 and T. singkawangensis Riedel, 2014, from which it can be distinguished by the more slender elytral apex, the morphology of the penis and 18.6-19.2% p-distance of its cox1 sequence.

Figures

Figure 4. Trigonopterus linauensis 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.