Yangus burckhardti Cho, 2025

Yangus burckhardti Cho sp. nov.

( Figs 7–14 View FIGURES 1‒8 View FIGURES 9‒14 )

Material examined. Holotype ♂, Myanmar: Southern Shan State, Ywangan-city, Yanae village , 21°05'53.00"N 96°21'25.50"E, 1100 m, 7.v.2017, Harrisonia perforata (G. Cho) , ( SNU, dry mounted). GoogleMaps

Paratypes. Myanmar: 67 ♂, 85 ♀, 1 immature, same data as holotype ( NHMB, SNU, slide mounted, in 95% ethanol) GoogleMaps ; 10 ♂, 12 ♀, same data as holotype but 6.v.2017 ( SNU, in 95% ethanol) GoogleMaps .

Other material examined. Myanmar: 1♀, Kachin State, Lone Ton, Indawgyi lake , 25°05'07.36"N 96°17'14.40"E, 180 m, 10.vii.2019, Light trap ( G. Cho), ( SNU, in 95% ethanol) GoogleMaps .

Diagnosis. Adult. Body light green with translucent forewings ( Fig. 7 View FIGURES 1‒8 ). Genal processes ( Fig. 9 View FIGURES 9‒14 ) 0.4 times as long as vertex along midline, broadly conical, subacute apically. Antenna 0.6–0.7 times as long as head width. Forewing ( Fig. 10 View FIGURES 9‒14 ) long oblong oval, almost parallel, apex slightly asymmetrical; vein C+Sc rounded, pterostigma straight, long triangular; cell m 1 long subtrapezoidal. Metatibia with three grouped apical spurs, genual spine absent. Paramere ( Fig. 13 View FIGURES 9‒14 ) aculeus shape, curved subapically, acute at apex. Distal segment of aedeagus ( Fig. 14 View FIGURES 9‒14 ) thick and short with a bulbous apex.

Description. Adult. Colouration ( Fig. 7 View FIGURES 1‒8 ). Body light green, intersegmental membranes light yellowish green. Compound eyes whitish, ocelli orange to light yellowish brown. Antennal segments 1−2 light brown, segments 3– 10 light yellowish brown. Forewing translucent, veins whitish. Hindwing semitransparent. Legs light green, tibiae and tarsi light green to light yellowish brown. Younger specimens with lighter colour, yellowish.

Structure. Head ( Fig. 9 View FIGURES 9‒14 ) with vertex 0.7 times as long as wide; vertex trapezoidal; genal processes broadly conical, subacute apically, 0.4 times as long as vertex along midline, contiguous basally. Antenna 0.6–0.7 times as long as head width; rhinaria present on antennal segments 4, 6, 8, and 9; segment 3 longest, subequal in length to combined length of segments 4‒6; segments 4, 9‒10 subequal in length; segments 5‒8 subequal in length; segment 10 with two relatively thick and long terminal setae, respectively 1.2 and 1.5 times as long as segment 10. Forewing ( Fig. 10 View FIGURES 9‒14 ) long, oblong oval, 2.9–3.2 times as long as head width, 3.0–3.3 times as long as wide; fore and apical margins rounded, apex slightly asymmetrical; pterostigma relatively large, long triangular; vein C+Sc rounded; cell c+sc relatively small; vein Rs weakly sinuous, slender; vein M almost straight; cell m 1 relatively large, long subtrapezoidal, with cell value 2.9–5.4; cell cu 1 relatively large, long subtriangular, with cell value 4.4–5.7; surface spinules present in all cells, densely spaced forming irregular transverse rows, leaving narrow spinule-free stripes along the veins, slightly thicker on cells cu 1 and cu 2. Metacoxa with conical meracanthus; metatibia 0.7 times as long as head width, with three grouped apical spurs, genual spine absent; metabasitarsus with a pair of small spurs. Male and female terminalia as in Figs 11–12 View FIGURES 9‒14 . Male proctiger slender and tubular, curved subapically, hairy in distal portion. Male subgenital plate irregularly hemispherical, angled in profile, covered in short, relatively sparse setae laterally and ventrally. Paramere ( Fig. 13 View FIGURES 9‒14 ) aculeus shape, widest basally, curved inward subapically, acute at apex; inner and outer surface covered in short hairs, hind margin with slightly denser and thicker long setae. Distal segment of aedeagus ( Fig. 14 View FIGURES 9‒14 ) consisting of a tubular, thick, and short basal half and a reniform bulbous apical half, strongly curved in the middle. Female proctiger 0.4–0.5 times as long as head width, dorsal outline weakly concave, curved subapically, apex subacute, covered with fine and sparse setae; circumanal ring 0.3–0.4 times as long as proctiger, with a row of vertically thin pores. Female subgenital plate 0.8 times as long as proctiger, cuneate, gently tapering, apex subacute, ventral margin, in profile almost straight, covered in fine sparse setae. Dorsal valvula cuneate; lateral valvula asymmetrically rounded apically; ventral valvula straight, simple without apical teeth.

Measurements ( 3 ♂ / 3 ♀; in mm). Head width 0.47−0.52/ 0.56; vertex width 0.26−0.31/ 0.32−0.34; vertex length 0.19−0.22/ 0.23−0.23; genal process length 0.07−0.08/ 0.09−0.10; antennal length 0.35−0.37/ 0.35−0.37; length of first antennal flagellomere 0.04/ 0.03; forewing length 1.37−1.52/ 1.74−1.80; forewing width 0.46−0.48/ 0.53−0.56; length of vein Rs 0.92−1.00/ 1.19−1.22; metatibia length 0.32−0.36/ 0.37−0.39; male proctiger length 0.17; paramere length 0.09−0.10; length of distal segment of aedeagus 0.09; female proctiger length 0.23−0.25; length of circumanal ring 0.08−0.09; female subgenital plate length 0.19−0.20.

Fifth instar immature. Only one immature has been found on the host plant ( Fig. 8 View FIGURES 1‒8 ).

Etymology. The new species is dedicated to our friend Daniel Burckhardt, our most famous and the still very active psyllidologist, who had a lifelong interest in Psylloidea taxonomy and phylogeny.

Distribution in Myanmar. Kachin and Shan states.

Host plant. Harrisonia perforata (Blanco) Merr. ( Rutaceae ), confirmed by the presence of immature.