Zanchius tuehang Kim & Jung 2025, sp. nov.

Zanchius tuehang Kim & Jung sp. nov. Figs 1 A – C, 2 A, E, F, M, 3 A, B Type materials. Holotype: 1 ♂ Vietnam • Hoa Trung Lake, Hoa Lien Ward, Hoa Vang District, Da Nang City, 16.0891°N, 108.0425°E, 90 m altitude, on Mallotus barbatus Müll. Arg., 1865, 2.xi.2024, J. Kim (ZCDTU) (DTUHMM 0018). Paratypes: Vietnam • 3 ♀♀, same data as for holotype (ZCDTU) (DTUHMM 0019–0021). Diagnosis. Recognized by body mostly yellowish green with small, mottled, bluish-green spots, sparsely covered with long, dark setae; head mostly greenish pale brown; antennae with dark, reddish annulations, shorter than body length; first segment greenish pale brown, with lateral dark stripe, apically tinged with red, thickest; second segment pale brown with reddish annulations at base and on middle parts, with dark annulation at base, three times subequal to first segment; third and fourth segments pale brown with dark annulation basally; pronotum entirely green, with long dark setae sparsely at posterior part; scutellum yellowish pale brown, with long dark setae sparsely medially; hemelytra mostly yellowish brown with small mottled spots; clavus with long, dark setae, more sparse posteriorly; inner suture of corium with dark marking, with sparse, long, dark setae on dark marking; membrane subhyline, yellowish; cells with greyish marking at posterior part; legs mostly greenish; femur entirely green; tibia mostly pale brown, basal part greenish; left paramere bifurcated, hypophysis slightly coiled apically; right paramere simple, rod-shaped, with lateral spine; endosoma with three spiculi, one spicule long and two spiculi short, sharp (Fig. 2 E, F, M). Description. Male: coloration: head: mostly pale brown with dark markings; vertex and frons yellowish pale brown; postocular part yellowish green; clypeus, juga and antennal socket greenish pale brown; antennae mostly pale brown with dark and reddish annulations; first segment pale brown with dark lateral stripe and reddish apical part; second segment pale brown with dark base and two medial reddish annulations, basal annulation close to dark base; third segment mostly pale brown with dark basal part; fourth segment mostly brown; labium entirely greenish pale brown. Thorax: pronotum mostly green, lateral areas and medial part somewhat paler; scutellum mostly green, somewhat pale green; hemelytra yellowish brown with tiny mottled greenish spots; clavus yellowish green with overall tiny greenish spots; corium yellowish brown with tiny greenish spots, anterior and posterior parts with relatively sparse spots, inner area with dark marking; cuneus subhyline, its margin bluish green; membrane greyish; vein tinged with green; two cells with dark spot posteriorly; legs mostly green; femur entirely green; tibia entirely pale brown, basal part somewhat green; tarsus brown, except for dark claw. Abdomen: entirely green. Surface and vestiture: body shining, densely covered with two different types of setae, silvery and dark setae; head glossy; vertex and frons covered with silvery setae; first antennal segment covered with short erected dark setae; pronotum sparsely covered with short silvery setae laterally, and covered with dark setae posteriorly; scutellum sparsely covered with dark setae medially; hemelytra covered with two types of setae, silvery and dark setae; clavus covered with silvery setae, sparsely covered with dark setae along commissure; corium covered with silvery setae, middle part of corium sparsely covered with dark setae; embolial margin densely covered with short setae; cuneus sparsely covered with silvery setae, sparsely covered with dark setae along cuneal margins. Structure: Body elongate-oval, length 2.91 mm. Head: hypognathous, two times as wide as long; vertex about as wide as eye; frons distinctly protruding forward of compound eye in dorsal view; postocular distance longer than first antennal segment diameter; antennae linear, shorter than body length; first segment thick, shorter than head length, longer than vertex width; second segment subequal to three times first segment length, subequal to combination of third and fourth segments; third segment distinctly longer than fourth segment; proportion of first to fourth antennal segments 0.3: 1.0: 0.5: 0.4; labium reaching hindcoxae, not reaching abdomen; proportion of first to fourth labial segments 0.3: 0.2: 0.17: 0.15. Thorax: pronotum trapezoid, basally twice wider than long, posterior margin concave; calli somewhat swollen; both scutellum and exposed part of mesoscutum large, combined length mesially shorter than wide, longer than pronotum; exposed part of mesoscutum large, slightly as long as scutellum at midline; commissure longer than scutellum; cuneus large, elongate, cuneal length laterally about one third as long as corial length; hindtibia shorter than costal margin. Abdomen: tapered to apex, not reaching apex of cuneus. Genitalia: pygophore asymmetrical with straight and angled margins (Fig. 2 A); left paramere bifurcate, sensory lobe (sl) thick and blunt with long setae apically, hypophysis (hp) originating on middle part of sensory lobe, slightly coiled apically, apex thin (Fig. 2 E); right paramere rod-shaped, hp short, simple, with one spine laterally (Fig. 2 F); endosoma with three spiculi; one spicule (sp I) long and thin; two spiculi (sp II, III) short, subequal to 1 / 2 longest spicule, sharp, ductus seminis (ds) long (Fig. 2 M). Female: coloration: as in male. Surface and vestiture: as in male. Structure: as in male, except for slightly wider vertex, exceeding compound eye width. Genitalia: sclerotized rings (sr) of dorsal labiate plate oval, with serrate areas (Fig. 3 A); posterior wall with large, serrate interramal lobe (irl), apically terminating with blunt process (Fig. 3 B). Etymology. Named after Dr Le Nguyen Tue Hang, Vice Director of Duy Tan University, in recognition of her invaluable support for this research; used as a noun in apposition. Host. Mallotus barbatus (Euphorbiaceae). Distribution. Known only from the type locality. Remarks. This new species is most similar to the Japanese Z. nakatanii Yasunaga, 1999, but it can be distinguished by the following: dorsum being densely covered with tiny greenish spots (vs sparsely distributed in the latter species); the third antennal segment clearly longer than fourth segment (vs third segment subequal to fourth segment); clavus with dark setae (vs clavus without dark setae), small tiny greenish spots entirely distributed on clavus (vs small spots sparsely distributed on clavus); and cuneus with dark setae (vs cuneus without dark setae); see the original description by Yasunaga (1999) and fig. 52 by Yasunaga and Takai (2001). Yasunaga (1999: 171) presented “ many green circular spots on the hemelytra ” as a diagnostic character of Z. nakatanii, but the new species Z. tuehang sp. nov. exhibits denser spots than Z. nakatanii. This new species also resembles the Taiwanese Z. formosanus Lin, 2005, but it can be distinguished by the following: small body, approximately 3 mm (vs larger body, about 3.3 mm); dorsum with tiny greenish spots (vs dorsum without tiny greenish spots); third antennal segment longer than fourth segment (vs third segment subequal to fourth segment); left paramere with long hypophysis and broad sensory lobe (vs left paramere with short hypophysis and narrow sensory lobe); and right paramere with short hypophysis and broad sensory lobe (vs right paramere with long hypophysis and not broad sensory lobe) (see Lin 2005: figs 1 C, 2 D – F).