Carinata bisecta Hg. Nguyen, Dietrich & Bui, 2025

Carinata bisecta Hg. Nguyen, Dietrich & Bui View in CoL , sp. nov.

( Figs 1–2 View FIGURE 1 View FIGURE 2 )

Description. Length of male 5.5 mm. Dorsal coloration ( Figs 1A, B View FIGURE 1 ) orange tinged with yellow; head with large median anterior preapical black spot on crown and smaller black spots on frontoclypeus, one below each antenna; posterolateral corners of pronotum and corium of forewing between vein R and claval suture with dark brown pigment. Head with crown angulately produced, anterior margin forming nearly right angle in dorsal view, median length subequal that of pronotum. Front femur AM1 near midheight, IC with 9 fine setae, AV with 11 large setae, PV with 9 short setae, stout distal seta absent; tibia with numerous short setae in rows PD, AD and PV, AV with numerous long macrosetae, distinct accessory row of 5 setae present between AD and AV. Hind tibia formula PD:AD:AV 26:13:14; apex of femur macrosetae formula 2+1+1; tarsomere I pecten with 3 tapered setae. Male pygofer ( Figs 1C, D View FIGURE 1 ) ~2.5x longer than tall, produced posterodorsally with apex round, surface with few short setae scattered over distal half; ventral appendage ( Fig. 1F View FIGURE 1 ) arising near midlength and extended posterodorsad for short distance along ventral of lobe, acuminate, not extended to lobe apex. Segment X long, tubular, well sclerotized and darkly pigmented. Subgenital plate ( Fig. 1E View FIGURE 1 ) slightly longer than pygofer, lateral margin moderately expanded near midlength then gradually tapered to rounded apex, with submedial ventral row of 3 – 4 macrosetae in basal half, distal half with longitudinal band of shorter stout setae medially, apex with marginal band of stout setae of varying lengths. Style preapical lobe ( Fig. 1G View FIGURE 1 ) poorly developed and obtusely angulate, apophysis (Fig. H) curved slightly laterad, apex slightly expanded and truncate with acute medial and lateral angles. Connective ( Fig. 1G View FIGURE 1 ) Y-shaped, more than twice as long as maximum width, stem much longer than anterior arms. Aedeagus ( Fig. 1G View FIGURE 1 ) with preatrium well developed but short, wider than shaft in ventral view with pair of acutely angulate anterolateral flanges in ventral view; dorsal apodeme ( Fig. 1G View FIGURE 1 ) well sclerotized and movably articulated to atrium, produced dorsolaterad in dorsal view; shaft ( Figs 1G, H View FIGURE 1 ) short and blunt in lateral view, slightly constricted preapically, with two pairs of short spines (larger lateral and smaller medial) at apex, extended posterolaterad, pair of elongate arcuate ventral processes extended well beyond pygofer apex and divergent near midlength in ventral view; gonopore at junction of basal process and shaft of aedeagus in dorsal view.

Female closely resembling male overall but slightly larger. Length 6.0 – 6.5 mm. Ovipositor ( Fig. 2A View FIGURE 2 ) protruding only slightly beyond pygofer. Sternite VII ( Fig. 2B View FIGURE 2 ) with posterior margin weakly tetralobed, with median brown macula. First valvula ( Figs 2C, D View FIGURE 2 ) moderately slender, gradually broadened through most of length, tapered to sharp point distally, dorsal sculpture strigate, continuous with ventral sculpture near apex. Second valvula ( Figs 2E, F View FIGURE 2 ) gradually broadened from base to median dorsal cleft, distal toothed blades gradually broadened with dorsal margin arcuate then gradually tapered toward apex; with ~33 close-set conical dorsal teeth.

Etymology. The species name refers to the bisected ventral process of the aedeagus.

Material examined. Holotype, male, VIETNAM: Phu Tho Province, Xuan Son NP 21° 07’ 07’’ N, 104° 57’ 11’’ E, 395.6m, 27 July 2024, Nguyen T. T. Huong, sweeping in primary forest ( HNUE) GoogleMaps . Paratypes: 1 male, 4 females, same data as holotype ( HNUE) GoogleMaps .