Trigonopterus grimmi, Riedel, 2022

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

1. Trigonopterus grimmi sp. nov.

Figs 1 , 10

Material examined.

Holotype (SMNS): ARC7270 (GenBank # OP078711 ), E-Malaysia, Sarawak, Gn. Gading NP, 50-300 m, 20-23-II-2012 . Paratypes (SMNK, SMNS): 2 exx, ARC7271, E-Malaysia, Sarawak, Gn. Gading NP, 50-300 m, 08-10-XII-2010 .

Diagnostic description.

Holotype, male (Fig. 1a ). Length 2.90 mm. Color black except antennae light ferruginous, legs dark ferruginous. Body in dorsal aspect subrhomboid, with marked constriction between pronotum and elytron; profile dorsally convex. Rostrum with median and pair of submedian ridges; intervening furrows with sparse rows of erect, clavate scales; epistome with transverse, angulate ridge; forehead in profile with subangulate knob. Pronotum with indistinct subapical constriction; disk densely punctate, interspaces weakly microreticulate; each puncture containing small recumbent seta. Elytra with humeri markedly swollen, laterally subangularly projecting; striae marked by fine lines and rows of small punctures; stria 8 and 9 along humerus each with four to five large punctures; intervals flat, microreticulate; sutural interval with row of minute punctures. Metafemur with dorsoposterior edge denticulate; subapically with stridulatory patch. Dorsal edge of tibiae subbasally dentate. Abdominal ventrites 1-2 forming common cavity, at middle flat, subglabrous, with sparse erect scales; laterally with distinct rim; lateral rim of abdominal ventrite 2 in profile projecting dentiform; abdominal ventrite 5 flat, coarsely punctate-foveate, with sparse erect scales. Penis (Fig. 1b ) with sides of body subparallel; apex subangulate; transfer apparatus flagelliform, ca. 4.3 × as long as body; apodemes 3.5 × as long as body; ductus ejaculatorius without bulbus. Intraspecific variation. Length 2.70-2.90 mm. Female rostrum dorsally medially subglabrous, sublaterally punctate-rugose; epistome simple. Female elytra with humeri less prominent, convex.

Distribution.

Sarawak (Gn. Gading NP). Elevation: ca. 50-300 m.

Etymology.

The species is named for the late darkling beetle expert Roland Grimm, who collected the type series of this species. The epithet is a noun in the genitive case.

Notes.

Trigonopterus grimmi sp. nov. is coded as " Trigonopterus sp. 1247". This species belongs to the T. trigonopterus group. It is closely related to T. trigonopterus Riedel, 2014, from which it can be distinguished by its flat elytral intervals and 17.3% p-distance of its cox1 sequence.

Figures

Figure 1. Trigonopterus grimmi sp. nov., holotype a habitus b penis.

Figure 10. Map of the new Trigonopterus species of the T. trigonopterus group across the Sundaland area. Prepared using GeoMapApp (www. geomapapp. org;; Ryan et al. 2009); azure = T. grimmi sp. nov., yellow = T. siamensis sp. nov., red = " T. singaporensis sp. nov., magenta = T. trigonopterus Riedel.