Trigonopterus microreticulatus Riedel, Trnka & Wahab, 2022

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

5. Trigonopterus microreticulatus Riedel, Trnka & Wahab sp. nov.

Figs 5 , 11

Material examined.

Holotype (SMNS): ARC7268 (GenBank # OP078709 ), E-Malaysia, Sarawak, Mulu NP, 100 km SEE Miri , 200 m, 19-24-VIII-2003, sifted . Paratypes (SMNS, SMNK, UBDC, UPOL): 5 exx, ARC7273, same data as holo-type; 1 ex, ARC4886 ( GenBank # OP078703 ), Brunei, Ulu Temburong N.P., Kuala Belalong FSC, 04°32.793'N, 115°09.450'E, 16-I-2014 ; 1 ex, Brunei, Ulu Temburong N.P., Kuala Belalong FSC, 04°32.793'N, 115°09.450'E, 06-II-2013 ; 2 exx, ARC7395, Brunei, Ulu Temburong N.P., Kuala Belalong FSC, 04°32.793'N, 115°09.450'E, 07-II-2013 ; 4 exx, Brunei, Ulu Temburong N.P., Kuala Belalong FSC, 04°32.793'N, 115°09.450'E, 08-II-2013 ; 3 exx, Brunei, Ulu Temburong N.P., Kuala Belalong FSC, 04°32.793'N, 115°09.450'E, 10-II-2013 ; 2 exx, Brunei, Ulu Temburong N.P., Kuala Belalong FSC, 04°32.793'N, 115°09.450'E, 11-II-2013 ; 2 exx, ARC7396, Brunei, Ulu Temburong N.P., Kuala Belalong FSC, 04°32.793'N, 115°09.450'E, 12-II-2013 ; 3 exx, ARC7396, Brunei, Ulu Temburong N.P., Kuala Belalong FSC, 04°32.793'N, 115°09.450'E, 13-II-2013 ; 1 ex, ARC4885, Brunei, Ulu Temburong N.P., Kuala Belalong FSC, 04°32.793'N, 115°09.450'E, 15-II-2013 ; 2 exx, ARC4887, Brunei, Ulu Temburong N.P., Kuala Belalong FSC, 04°32.793'N, 115°09.450'E, 16-II-2013 ; 2 exx, Brunei, Ulu Temburong N.P., Kuala Belalong FSC, 04°32.793'N, 115°09.450'E, 16-I-2014 .

Diagnostic description.

Holotype, male (Fig. 5a ). Length 2.48 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 and pair of submedian ridges, ending before apex; intervening furrows with rows of punctures and sparse erect scales; epistome with subangulate ridge. Pronotum with disk densely coarsely punctate, interspaces reticulate, microreticulate; each puncture containing small seta. Elytra with striae distinct; punctures each containing short recumbent seta; intervals flat, markedly microreticulate, dull; sutural interval with row of punctures from base to apex; intervals 3-6 with row of punctures in basal half; stria 8 along humerus with three large punctures and four smaller ones. Femora with simple anteroventral ridge. Metafemur with dorsoposterior edge denticulate; subapically with stridulatory patch. Dorsal edge of tibiae subbasally dentate, denticle acute. Abdominal ventrites 1-2 forming deep common cavity, at middle flat, subglabrous, with sparse erect scales; laterally and posteriorly with distinct rim; abdominal ventrite 5 flat, with coarse punctures, basally with sparse erect scales. Penis (Fig. 5b ) with sides of body subparallel; apex rounded, with sparse setae; transfer apparatus complex; apodemes 2.3 × as long as body; ductus ejaculatorius without distinct bulbus. Intraspecific variation. Length 2.00-2.63 mm. Coloration from light ferruginous to dark ferruginous.

Distribution.

Sarawak (Mulu NP); Brunei (Ulu Temburong NP). Elevation: 100-200 m.

Etymology.

This epithet is an adjective formed as a compound of the Greek mikros (small) plus the Latin reticulatus (netted) and refers to the elytral microsculpture.

Notes.

Trigonopterus microreticulatus Riedel, Trnka & Wahab sp. nov. is coded as " Trigonopterus sp. 1245". Morphologically it appears related to T. lambirensis sp. nov., from which it can be distinguished by the microreticulate elytra, 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. It is described under joint authorship with Rodzay Abdul Wahab (Universiti Brunei Darussalam, Tungku, Brunei) and Filip Trnka (Palacky University, Olomouc, Czech Republic).

Figures

Figure 5. Trigonopterus microreticulatus Riedel, Trnka & Wahab 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.