Nine new species of Trigonopterus Fauvel (Coleoptera, Curculionidae) from Sundaland Author Riedel, Alexander https://orcid.org/0000-0002-8291-4425 Museum of Natural History Karlsruhe, Erbprinzenstr 13, D- 76133 Karlsruhe, Germany riedel@smnk.de text ZooKeys 2022 2022-10-12 1124 109 130 http://dx.doi.org/10.3897/zookeys.1124.89318 journal article http://dx.doi.org/10.3897/zookeys.1124.89318 1313-2970-1124-109 F61C24CBF60E4F3797EBC21B01E1154F 3506C9ACB0AD58A1A886D678EBA8B6FD 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 x as long as body; apodemes 4.4 x as long as body; ductus ejaculatorius without bulbus. Intraspecific variation. Length 3.16-3.20 mm. Figure 9. Trigonopterus singaporensis sp. nov., holotype a habitus b penis. 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. 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. 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. 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.