Velia (Cesavelia) yiliangensis Fu, Jin & Ye, 2025, sp. nov.

Velia (Cesavelia) yiliangensis sp. nov. Figs 1 e, f, 2 e, f, k, l, 3 c, 4 e, f, k, l, o, t, u Material examined. Holotype: apterous ♂, China • Yunnan Province, Zhaotong City, Yiliang County, Xiaocaoba Scenic Area: 27.8271°N, 104.2869°E; 1758 m a. s. l.; 2020-VIII-19; Mu Qiao leg. (NKUM). Paratypes: 1 apterous ♂, 5 apterous ♀, same data as holotype (NKUM). Diagnosis. Body medium (length 6.33–6.80, width 1.82–2.27), mainly medium brown. Connexiva of apterous female curved, convergent in dorsal view posteriorly, with large, bright yellow stripes along entire connexiva in both sexes (Figs 1 e, f, 2 e, f, k, l), connexival spines short, caudally directed in males, absent in females (Fig. 2 e, f, k, l); abdominal segment VIII of male stout and ventrally concave (Fig. 4 e, f); proctiger of male broad, shield-shaped, posterior margin rounded (Fig. 4 k); paramere relatively slender, strongly curved, with thick setae on external side, apices sharp (Fig. 4 o); endosoma of male stout, apical ends of lateral sclerites constricted, dorsal sclerites distinctly weakly sclerotized, translucent and curved, secondary ventral sclerite slender, accessory sclerite absent (Fig. 4 t, u); proctiger of female broad, diamond-shaped (Fig. 4 l). Comparative notes. Velia (Cesavelia) yiliangensis sp. nov. is most similar to V. sinensis in appearance. It can be distinguished from other species of Cesavelia by the following characters: the absence of the accessory sclerite in the male endosoma distinguishes this species from V. tomokunii, V. championi, and V. mitrai (Fig. 4 t, u); the shape of the male proctiger (Fig. 4 k) distinguishes this species from V. bui, V. longiconnexiva, V. anderseni, V. laticaudata, and V. yunnana; and the entire connexiva with large, bright yellow stripes in both sexes, and two less prominent teeth near the sub-apical prominent tooth on the ventral side of the male metafemur (Figs 1 f, 3 c), distinguish this species from V. sinensis and V. tonkina. The extensor sides of the meso- and metatibia without long, erect setae distinguish this species from V. steelei. The large, bright yellow stripes along the entire connexiva in both sexes distinguish it from other new species in this study (Fig. 2 e, f, k, l vs. Fig. 2 a – d, 2 g – j). Description. Apterous male (holotype). Measurements. Body: length 6.47 (6.43–6.47), width 1.82 (1.82–2.02). Head: length 0.58, width: 1.11. Antenna: 4.59 (1.49 + 1.00 + 1.01 + 1.09), length of antennal segment I about 1.34 times head width. Pronotum: width about 1.14 times its length (length 1.40, width 1.60). Lengths of leg segments (femur: tibia: tarsus (tarsal segment I + segment II + segment III)): fore leg: 2.07: 2.03: 0.74 (0.07 + 0.20 + 0.47); middle leg: 2.90: 3.15: 1.85 (0.09 + 1.00 + 0.76), length of mesotarsus II about 1.32 times length of mesotarsus III; hind leg: 2.80: 3.30: 1.67 (0.09 + 0.89 + 0.69), maximum width of metafemur: 0.42, length of metatarsus II about 1.29 times length of metatarsus III. Color (Figs 1 f, 2 k, l). Body mainly brown, with scattered silvery pubescence. Pronotum with a row of black punctures near anterior margin and other punctures scattered on posterior lobe. Median part of posterior pronotal lobe pale brown. Sides of abdomen dark brown, with large, bright yellow stripes along entire connexiva; median parts of mediotergites with some dark orange marks, in another male brighter. Silvery pubescence usually distinctly denser on anterolateral corners of pronotum, lateral corners of metanotum, lateral parts of abdominal mediotergites II, V – VI, sparse on abdominal mediotergites I, III – IV and sternites. Structure. Body relatively large, covered with dense, short pubescence. Head (Figs 1 f, 2 k, l): triangular, almost perpendicular to thorax, without deflection; anteclypeus and postclypeus with dense, peg-like setae; antennal sockets prominent, antennal segment I much longer than head width, slightly thicker than antennal segments II – IV. Thorax (Figs 1 f, 2 k, l): pronotum slightly wider than length, posterior margin of pronotum broadly rounded, lateral parts of pronotum distinctly constricted at mid-length,, middle part slightly raised and lateral parts of anterior pronotal lobe concave; mesonotum completely hidden beneath pronotal lobe and hind part of metanotum visible in dorsal view; lateral evaporatoriums slender, with a cluster of suberect, thick setae on each side; legs mainly with decumbent or suberect setae, tarsi of fore legs short, tarsi of middle and hind legs long and slender; profemora moderately incrassate, slightly curved and contracted subapically; mesofemora medially slender; metafemora (Figs 1 f, 3 c) relatively slender, ventrally with two rows of small teeth and two prominent long teeth, the sub-apical tooth stouter than the sub-basal one, two long less prominent small teeth present near the sub-apical prominent tooth, are long, metatibiae ventrally with two rows of small spines. Abdomen (Figs 1 f, 2 k, l): relatively slender; mediotergite I concave laterally, mediotergites II – VII almost flat; connexiva moderately raised, almost parallel hardly converging, connexival spines very short, sharp, caudally pointed; abdominal segment VIII (Fig. 4 e, f) relatively stout, ventrally concave in lateral view, posteriorly with short, dense setae, posterodorsal margin medially emarginate. Genital segments (Fig. 4 k, o, t, u): relatively large and visible in vitro; proctiger (Fig. 4 k) shield-shaped, posterior margin rounded, posteriorly with short, sparse setae; paramere (Fig. 4 o) relatively slender, strongly curve, with thick setae on external side, apices sharp; endosoma (Fig. 4 t, u) stout, apical ends of lateral sclerites slightly constricted, dorsal sclerites weakly sclerotized, translucent and curved, secondary ventral sclerite slender, accessory sclerite absent. Apterous female. Measurements. Body: length 6.33–6.80, width 2.13–2.27. Head: length 0.62, width: 1.07. Antenna: 4.26 (1.40 + 0.93 + 0.93 + 1.00), length of antennal segment I about 1.31 times head width. Pronotum: width about 1.34 times its length (length 1.33, width 1.78). Lengths of leg segments (femur: tibia: tarsus (tarsal segment I + segment II + segment III)): fore leg: 2.10: 1.95: 0.72 (0.09 + 0.16 + 0.47); middle leg: 2.83: 3.17: 1.73 (0.09 + 0.91 + 0.73), length of mesotarsus II about 1.25 times length of mesotarsus III; hind leg: 2.70: 3.30: 1.52 (0.09 + 0.80 + 0.63), length of metatarsus II about 1.27 times length of metatarsus III. Color (Figs 1 e, 2 e, f). Similar to apterous male with following exception: in some females, bright yellow stripes along connexiva much wider than in male (Fig. 2 e). Mediotergites of some females exhibit brighter yellow coloration. Silvery pubescence denser on lateral parts of mediotergites I and III (Fig. 2 e). Structure. Body slightly larger than apterous male. Head (Figs 1 e, 2 e, f): Similar to apterous male. Thorax (Figs 1 e, 2 e, f): similar to apterous male with following exceptions: profemora much slender; metafemora more slender, ventrally with two rows of small spines on each side, metatibiae ventrally without any spines or teeth. Abdomen (Figs 1 e, 2 e, f): similar to apterous male with following exceptions: relatively stout; connexiva curved, gradually convergent towards abdominal apex, connexival spines absent. Genital segments: gonocoxae and gonapophyses semi-membranous, rami strongly sclerotized; proctiger (Fig. 4 l) broad, diamond-shaped, posteriorly with short, sparse setae. Macropterous female and macropterous male. Unknown. Etymology. This species is named after its type locality, Yiliang County, Yunnan Province, China. Distribution. China (Yunnan) (Fig. 6).