Cheilocapsidea bachmaensis Kim & Chérot, 2025

Cheilocapsidea bachmaensis Kim & Chérot sp. nov.

( Fig. 2 View FIGURE 2 )

Diagnosis. Recognized by the mostly greenish brown body; first antennal segment entirely brown, longer than fourth segment; second antennal segment mostly brown, with one dark annulation at apex; labium reaching hind coxae; hemelytra mostly brown with greenish sutures and four distinct dark markings; hind tibia pale brown tinged with green, with dark spot on base and lateral dark stripe from base to middle ( Fig. 2C View FIGURE 2 ); left paramere and right paramere with sharp hook-shaped process; endosoma with one long and curved sclerite and with another lateral sclerite, thin and broad with sharp apex ( Fig. 2D–K View FIGURE 2 ).

Description. MALE: Body elongated-oval, length 7.87, mostly brown with greenish parts and four noticeable dark spots at hemelytral lateral margins. Coloration: Head: Mostly brown with greenish spots; vertex and frons mostly brown; clypeus and juga green tinged; antennae mostly brown with dark annulations and greenish parts; first segment entirely brown; second segment mostly brown, with apical dark annulation; third segment brown, with apical dark annulation, medially tinged with green; fourth segment with dark apical annulation, basal part tinged with green; labium entirely brown; first segment tinged with green. Thorax: Pronotum mostly brown, inner part tinged with green; pronotal collar brown with thin transverse line; scutellum entirely brown, suture from mesoscutum green; hemelytra mostly brown, somewhat semitransparent, with greenish sutures and markings; claval sutures and embolial sutures green; mesial and lateral margin of corium with dark spots; embolial margin tinged with green, with greenish transverse lines; lateral margin of cuneal fracture with dark spots; cuneus mostly brown, tinged with green on lateral and apical margins; membrane entirely greyish; vein tinged with green; legs pale brown, mostly tinged with green; hind tibia pale brown tinged with green, with dark spot on base and lateral dark stripe from base to middle; tarsus brown tinged with green, except for dark spot of third tarsal segment. Abdomen: Mostly yellowish brown except for darker pygophore. Surface and vestiture: Body somewhat glossy, glabrous, sparsely covered with golden setae, with very tiny and sparsely punctures; head shagreened; vertex, frons and clypeus sparsely covered with golden setae; first antennal segment with dark spines; pronotum, scutellum and hemelytra shagreened, also sparsely covered with golden setae; hemelytra with very tiny punctures. Structure: Head: Weakly prognathous; vertex with sulcus, width more than single compound eye width; antennae linear and long, more than body length; first segment thickest, long, more than head width, slightly shorter than 1/2 second segment; second segment shorter than combination of third and fourth segments; third segment longer than fourth segment; proportion of first to fourth antennal segments 1.4: 3.2: 2.3: 1.2; labium reaching apex of hind coxae. Thorax: Pronotum trapezoid, longitudinal length slightly shorter than 1/2 basal maximal width, posterior margin almost straight; calli weakly swollen; pronotal collar medial length short; scutellum flat, anterior width longer than 1/2 basal pronotal width, longitudinal length more than pronotum longitudinal length, shorter than commissure; lateral margin of hemelytra almost straight; cuneus triangular, elongate, anterior width shorter than cuneal length. Abdomen: Rounded, not reaching to apex of cuneus. Genitalia: left paramere with broadly and vertically developed sensory lobe, hypophysis broad, with sharp and hook-shaped apex ( Fig. 2D–G View FIGURE 2 ); right paramere simple, sensory lobe broad, hypophysis with hook-shaped process ( Fig. 2H View FIGURE 2 ); endosoma membranous with medial sclerite, lateral sclerite, and gonoporal sclerite; medial sclerite long and thick, longer than membrane, apex broad with hook-shaped process; lateral sclerite thin and broad, shorter than medial sclerite, apex sharp; gonoporal sclerite U-shaped; ductus seminis relatively short ( Fig. 2I–K View FIGURE 2 ).

FEMALE: Unknown.

Measurements (in mm). Male (n=1) Body length, clypeus–apex of membrane: 7.87; head length, excluding collar: 0.58; head width, including compound eyes: 1.28; vertex width: 0.47; 1 st antennal segment length: 1.41; 2 nd antennal segment length: 3.25; 3 rd antennal segment length: 2.33; 4 th antennal segment length: 1.24; total antennal length: 8.23; mesial pronotal length: 1.16; posterior pronotal maximal width (straight): 2.39; anterior scutellar width: 1.62; mesial scutellar length: 1.34; commissure length: 1.64; maximal width across hemelytron: 1.46.

Host. Unknown.

Distribution. Vietnam (Central).

Etymology. Named after Bach Ma National Park, the type locality where the specimen was collected.

Specimen examined. [ ZCDTU] Holotype: 1♂, Bach Ma National Park (16.2000° N, 107.8500° E), alt. 1450 m, Loc Tri , Phu Loc distinct, Thua Thien Hue Province, Vietnam, 16.xi.2024, by light trap, J. Kim leg. GoogleMaps

Discussion. The new species is easily distinguished from congeners by the greenish coloration of the dorsum and legs. Cheilocapsidea bachmaensis sp. nov. is distinguished from C. insignis (Distant, 1909) by the entirely pale brown first antennal segment (vs. antennal segment with dark stripe on inner margin); second antennal segment with one dark annulation at apex (vs. two dark annulations at middle and at apex); pronotum entirely greenish brown (vs. pronotum with dark stripes on lateral margins); and endosoma with one lateral sclerite (vs. endosoma without lateral sclerite). The new species is separated from C. pura ( Yasunaga, 1995) by the smaller body, about 8 mm (vs. large body, more than 11 mm); the entirely pale brown first antennal segment (vs. antennal segment with dark stripe on lateral margin); second antennal segment clearly being longer than third segment (vs. second segment being slightly longer than third segment); second and third antennal segments with one dark annulation at apex (vs. two dark annulations at middle and at apex of each segment); pronotum entirely greenish brown (vs. pronotum with dark stripes on lateral margins); greenish stripe along inner margin of clavus (vs. dark stripe along inner margin); and hypophysis of left paramere with sharp and hook-shaped apex [vs. hypophysis of left paramere blunt—see the original description and illustration in Yasunaga (1995)]. Cheilocapsidea bachmaensis sp. nov. is easily distinguished from C. rufescens ( Yasunaga, 1995) by the greenish dorsum (vs. reddish dorsum); first antennal segment longer than fourth segment (vs. first segment shorter than fourth segment); labium reaching hind coxae (vs. labium not reaching hind coxae); and cuneus greenish and subhyaline (vs. cuneus deep reddish brown). Cheilocapsidea bachmaensis sp. nov. also exhibits four noticeable dark spots on the hemelytra: two on the outer and middle area of the corium and two on the posterior area of the embolium. These four dark spots are easily distinguished from six dark spots (two on the outer and middle area and two on the inner and posterior area of corium and two on the posterior area of the embolium—see fig. 1 in Yasunaga (2011) and fig. 8 in Chérot & Malipatil (2016)) of C. insignis . C. pura exhibits four dark spots on corium only [see fig. 1 in Yasunaga (2011)]. These spots may serve as diagnostic characters for this species. However, we did not select this character state as diagnostic considering the potential for variation.