Euconnus (Tetramelus) magnirufus Jałoszyński, 2024, sp. nov.

Euconnus (Tetramelus) magnirufus sp. nov. (Figs 15, 23, 69–72) Material studied. Holotype: ♂ (CHINA: Yunnan): “CHINA: N-Yunnan [C03-07] / Zhongdian Co., 55 km N Zhong- / dian, 28°19.8’ N, / 99°45.7’E, / 3800m, primary mixed forest, / Rhodod., dead wood, mushrooms, / moss, 18.VIII.2003, M. Schülke ” [white, printed], “ EUCONNUS / (TETRAMELUS) / magnirufus m. / P. Jałoszyński, 2024 / HOLOTYPUS” [red, printed] (MNHB). Paratypes (19 exx.): 12 ♂♂, 4 ♀♀, same data as for holotype; 1 ♂, 2 ♀♀, “ CHINA (N-Yunnan) Zhongdian / Co., 55 km N Zhongdian, / 28°19.8’N / 99°45.7’E, 3800m / (primary mixed forest, / Rhodod., dead wood, leaf / litter, mushrooms, moss) / 18.VIII.2003, Wrase [07]” [white, printed] (cPJ, MNHB). Diagnosis. Body rufous brown; male metatrochanter distally produced into moderately long subtriangular spine, ventral margin of trochanter bent at an obtuse angle; aedeagus in ventral view about twice as long as wide, its ventral plate much wider than long, with sinuate lateral margins converging distally to rounded apex, dorsal plate distinctly wider than long, with strongly sinuate lateral margins converging distally to subtriangular and rounded apex, endophallus in ventral view with one slender and nearly L-shaped sclerite narrowing distally, surrounded by membranous folds densely covered with cuticular denticles. Description. Body of male (Fig. 15) elongate and slender, moderately convex, with long appendages, BL 2.35–2.43 mm; cuticle glossy, pigmentation uniformly rufous brown, vestiture of setae lighter than cuticle. Head in dorsal view round, broadest across eyes, HL 0.38–0.40 mm, HW 0.35–0.38 mm; in lateral view each temple 5 times as long as eye; vertex weakly convex and only slightly bulging posterodorsally; frons flattened; supraantennal tubercles small and indistinctly elevated. Eyes very small but not vestigial, finely faceted, hardly projecting laterally from head silhouette, in lateral view oval. Punctures on vertex and frons inconspicuous, small and sparse; setae short and sparse, suberect, sparse and short thick bristles present on vertex and tempora. Antennae slender, indistinctly shorter than half BL, AnL 0.93–1.03 mm; antennomeres 1–6 elongate (6 weakly so), 7–8 each about as long as broad, 9 and 10 each weakly transverse, 11 slightly shorter than 9–10 combined, about 1.7 times as long as broad. Pronotum broadest in anterior to middle, PL 0.50–0.55 mm, PW 0.45–0.48 mm; anterior margin arcuate, lateral margins rounded in anterior half and nearly straight in posterior third, posterior corners slightly obtuse-angled, blunt; posterior margin weakly rounded. Pronotal base with single outer pair of small and shallow but distinct pits. Punctures on pronotal disc inconspicuous; setae moderately dense and short, suberect and on sides mixed with thick bristles. Elytra oval, broadest slightly anterior to middle, EL 1.38–1.50 mm, EW 0.85–0.90 mm, EI 1.57–1.74; basal impressions and humeral calli lacking, elytral apices rounded together. Punctures on elytral disc inconspicuous, superficial; setae similar to those on pronotum, moderately dense and weakly suberect. Legs long and slender, metatrochanter (Fig. 23) modified, distally produced into moderately long subtriangular spine, ventral margin of trochanter bent at an obtuse angle. Metaventrite with deep oval median impression occupying most of its surface, extending on almost entire length. Aedeagus (Figs 69–72) elongate, AeL 0.63 mm; median lobe in ventral view broadest in subapical region, rapidly narrowing distally, ventral plate much wider than long, with sinuate lateral margins converging distally to rounded apex, dorsal plate distinctly wider than long, with strongly sinuate lateral margins converging distally to subtriangular and rounded apex, endophallus in ventral view with one slender and nearly L-shaped sclerite narrowing distally, surrounded by membranous folds densely covered with cuticular denticles. Dorsal wall lacking setae; parameres slender, each with 3 long subapical setae. Female. Similar to male but with indistinctly smaller and more circular eyes, lacking metaventral impression and with unmodified metatrochanters. BL 2.28–2.43 mm; HL 0.38–0.40 mm, HW 0.38 mm, AnL 0.93–1.00 mm; PL 0.53–0.55 mm, PW 0.45–0.48 mm; EL 1.38–1.50 mm, EW 0.88–0.95 mm, EI 1.47–1.67. Distribution. WS China: Yunnan, Diqing Tibetan Autonomous Prefecture. Etymology. The adjective magnirufus alludes to the large body size and brown pigmentation with a faint reddish hue. Remarks. Euconnus magnirufus is the largest Chinese Tetramelus known so far. It has the endophallic structures similar to those in E. punctator and E. mediorufus sp. nov. described below. However, shapes of the ventral and dorsal plates of the median lobe in each of these species are clearly different.