Onycholabis hainanus Bolkiboev & Liang 2026, sp. nov.

Onycholabis hainanus Bolkiboev & Liang sp. nov. Fig. 1 B Chinese common name. 海南爪步甲. Type material. Holotype: ♂ (IZCAS), China, Hainan Province, Baisha County, Yuanmen Township, Yinggezui Station, 19.05208°N, 109.56480°E, 600 m, 2009.11. 19, nighttime, leg. Hongbin Liang. Holotype Onycholabis hainanus det. Bolkiboev & Liang, 2026 [red label]. Paratypes: 10 ♂♂ and 8 ♀♀ (IZCAS, TARI) • 8 ♂♂, 6 ♀♀, same data as holotype • 1 ♂, 1 ♀, same data as holotype but 2009.11. 18 • 1 ♂, 1 ♀, China, Hainan Province, Lingshui County, Diaoluoshan, Xin-an, 18.72510°N, 109.86861°E, 921 m, 2012.04. 16, daytime, leg. Hongliang Shi & Ye Liu. Each paratype bears a yellow label: Paratype Onycholabis hainanus det. Bolkiboev & Liang, 2026. Description. Length: 9.5–10.9 mm. Coloration: Body black, shiny; mandibles, labrum reddish brown; antennomeres 1–4 pale yellow, others brown; maxillary palpi pale yellow, apical palpomere reddish yellow; femora brown, tibia pale yellow, tarsi pale yellow to brown; ventral side reddish brown to black. Microsculpture: Head hardly visible and formed of isodiametric meshes, pronotum and elytra formed of transverse meshes. Head with large and markedly prominent eyes (HW / FW = 1.67–1.81, mean 1.74, in five males and five females) and markedly constricted neck; tempora short, EYL / TL = 3.00–3.44 (3.22); vertex moderately convex with surface very smooth and shiny; frontal furrows deeply concave, subparallel in front and slightly divergent posteriorly, anterolateral surface of frons longitudinally smooth; anterior supraorbital seta situated anterior to mid-eye level (in several specimens with two anterior supraorbital setae of left side), posterior supraorbital seta situated on post-eye level; mandibles long, slender, gently curved inwards and gradually narrowing apically; terminal maxillary palpomeres slender, shorter than penultimate palpomeres, cylindrical in median portion and truncate at apices; terminal labial palpomeres shorter than the penultimate; penultimate palpomeres bi-setose; median tooth of mentum bifid, with each apex sharply pointed; submentum 4 - setose; antennae filiform, extending to the middle of elytra; relative lengths of scape and antennomeres II – XI as follows: 1.00: 0.50: 1.80: 1.65: 1.35: 1.30: 1.10: 1.10: 1.10: 0.90: 1.00. Pronotum cordate, wider than long, widest at about apical one-third, slightly narrower (in holotype) or as wide as head (in paratypes), PW / HW = 0.95–1.00 (0.98), PW / PL = 1.11–1.26 (1.18), PAW / PBW = 1.07–1.14 (1.10), PW / PAW = 1.25–1.35 (1.29), PW / PBW = 1.36–1.46 (1.42); apical margin widely and rather shallowly emarginate throughout; front angles rounded, obtuse at tips; lateral margins finely reflexed, arcuate before widest parts, rather gradually convergent to basal one-sixth, then slightly sinuate anterior to rectangular, pointed hind angles; single pair of marginal setae situated slightly before widest part, one pair of marginal setae situated at hind angle; basal margin distinctly bisinuate and unbordered throughout; disc moderately convex, with surface smooth, except for sparse and scattered large punctures along basal and lateral portions; median line deep and complete, basal foveae deep, rugose punctate. Elytra subovate, moderately convex, widest slightly behind middle,> 1.5 × wider than pronotum, EW / PW = 1.80–1.92 (1.87); EL / EW = 1.62–1.71 (1.67); basal border not shortened and slightly curved; shoulders prominent and slightly rounded; lateral margins almost parallel-sided in basal portions, moderately convergent towards apices, subapical sinuation weak; apices conjointly rounded; scutellar striole long, distinctly punctate and not joining interval I; striae deeply impressed, strongly punctate at basal half, weakly punctate in apical portion; intervals smooth, moderately convex in basal half, strongly convex in apical half and flatter towards apex; interval III with first discal pore at basal one-fifth near stria III and second one at the behind middle and near stria II, interval IX with 18 umbilicate pores. Prosternum sparsely punctate or smooth, proepisternum punctate in inner part, mesosternum and mesoepisterna punctate, metasternum smooth or punctate laterally, metepisternum smooth; metepisterna long, 2.5 × as long as wide; visible sternites 3–5 bi-setose; sixth visible sternite bi-setose in male, 8 - setose in female. Legs long and slender; metacoxae bi-setose (inner seta absent); metafemora bi-setose; tarsi bisulcate; protarsomeres I – III with DAS and LAS, protarsi sulci shallow, metatarsomere I almost 1.5 × as long as metatarsomere II, metatarsomere IV bilobed apically, inner lobe equal to outer lobe, with LAS, metatarsomere V latero-ventrally asetose; claws simple (Fig. 4 D – F). Male genitalia: Median lobe of aedeagus long and slender, slightly arcuate at basal one-third, then almost straight toward apex in lateral view; apical lamella rounded at apex in dorsal view, bent ventrally, twice as long as wide; apical orifice long, reaching basal lobe. Left paramere broadly ovate and rounded at apex; right paramere small and narrow, with rounded apex. Endophallus not covered by tiny tooth-shaped sclerite scales; in lateral view, endophallus with a shallow, elongate-ovate fold in the middle section and a distinct suboval sclerotized area near the basal third (Fig. 2 C, D). Female genitalia and reproductive tract as in Fig. 3 C, D; apical gonocoxite almost 2 × shorter than basal gonocoxite, slightly curved with a relatively sharp apex, apical gonocoxite with five dorsolateral and two dorsomedial ensiform setae; basal gonocoxite with apical fringe of 9–11 setae. Bursa copulatrix small, spermatheca long, moderately arcuate, C-shaped, evenly curved throughout, with short duct, and spermathecal gland with moderately large, spherical shape, and long duct. Differential diagnosis. This new species is closely related to O. sinensis Bates, 1873 in having the pronotum with two marginal setae, but differs by pronotum narrower than or as wide as head, PW / HW = 0.95–1.0 (pronotum wider than head, PW / HW = 1.05–1.15 in O. sinensis), sixth visible sternite bi-setose in male (4 - setose in male of O. sinensis); apical lamella of the aedeagus comparatively longer and strongly bent ventrally (apical lamella of aedeagus shorter and not bent ventrally in O. sinensis). Distribution. China (Hainan: Baisha County; Lingshui County) (Fig. 8 A). Habitat. Adults of the new species were found at night on stones near a shallow river (Fig. 9). Etymology. The new species name hainanus refers to its type locality, Hainan Province in southeastern China.

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