Zanchius tuehang Kim & Jung, 2025

Zanchius tuehang Kim & Jung sp. nov.

Figs 1 A – C View Figure 1 , 2 A, E, F, M View Figure 2 , 3 A, B View Figure 3

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 ) GoogleMaps . Paratypes: Vietnam • 3 ♀♀, same data as for holotype ( ZCDTU) ( DTUHMM 0019–0021 ) GoogleMaps .

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 View Figure 2 ).

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 View Figure 2 ); 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 View Figure 2 ); right paramere rod-shaped, hp short, simple, with one spine laterally (Fig. 2 F View Figure 2 ); 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 View Figure 2 ).

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 View Figure 3 ); posterior wall with large, serrate interramal lobe (irl), apically terminating with blunt process (Fig. 3 B View Figure 3 ).

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).