Trigonopterus singaporensis, Riedel, 2022

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

9. Trigonopterus singaporensis sp. nov.

Figs 9 , 10

Material examined.

Holotype (ANIC): ARC5227 (GenBank # OP078706 ), Singapore, Bukit Timah Nat. Res., 01°21'N, 103°47'E, 100 m, 20-XI-1988 . Paratype (SMNK): ARC5172, same data as holotype.

Diagnostic description.

Holotype, male (Fig. 9a ). Length 3.20 mm. Color black except antennae light ferruginous, legs dark ferruginous. Body in dorsal aspect subovate, with 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 coarsely punctate, interspaces reticulate, weakly microreticulate; each puncture containing small recumbent seta. Elytra with humeri swollen, drawn ventrad, in dorsal aspect hardly projecting, rounded; striae distinct, deeply impressed, each with row of small punctures and sparse row of suberect scales; stria 8 along humerus with five large punctures; intervals costate-carinate, microreticulate; sutural interval with denser punctures. Metafemur subapically with stridulatory patch. Dorsal edge of pro- and mesatibia subbasally dentate, metatibia with small denticle. 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 coarsely punctate, with sparse erect scales, in apical half concave. Penis (Fig. 9b ) with body relatively small, sides membranous, appearing weakly concave; apex angulate; transfer apparatus flagelliform, ca. 5.5 × as long as body; apodemes 4.4 × as long as body; ductus ejaculatorius without bulbus. Intraspecific variation. Length 3.16-3.20 mm.

Distribution.

Singapore (Bukit Timah). Elevation: 100 m.

Etymology.

This epithet is a Latinized adjective based on the island of Singapore.

Notes.

Trigonopterus singaporensis sp. nov. is coded as " Trigonopterus sp. 742". This species belongs to the T. trigonopterus group. It is related to T. siamensis sp. nov., from which it can be distinguished by its costate-carinate elytral intervals never having rows of coarse punctures and 18.1% p-distance of its cox1 sequence.

Remark on T. tounensis Narakusumo & Riedel

In the abstract of Narakusumo and Riedel (2021) T. tounensis Narakusumo & Riedel was spelled as " T. tounaensis ", while in the description and the following figure headings the name T. tounensis was used, presenting two alternative spellings. As the first reviser according to article 24.2.1 of the ICZN (International Commission on Zoological Nomenclature, 1999) I decide that the name T. tounensis Narakusumo & Riedel should prevail, while " T. tounaensis " is to be considered an incorrect alternative spelling.

Figures

Figure 9. Trigonopterus singaporensis 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.