Triplectides buengkanensis, Jaroenchaiwattanachote & Pramual & Wangwasit & Bunchalee & Thanee, 2025

Triplectides buengkanensis sp. nov. Jaroenchaiwatthanachote, Pramual, & Thanee

Figs. 3–6 View FIGURE 3 View FIGURE 4 View FIGURE 5 View FIGURE 6

Diagnosis. Triplectides buengkanensis sp. nov. is similar to T. misakianus ( Matsumura 1931) ( Kuranishi 1999; Katsuma & Kuranishi 2016), T. nessimiani Desidério & Pes ( Desidério et al. 2020) , and T. indicus Walker 1852 in many characteristics including those of the forewings and hind wings and the shapes and lengths of the preanal appendages and of the basoventral and basomesal lobes and apically acute second articles of the inferior appendages. However, Triplectides buengkanensis sp. nov. can be distinguished from T. misakianus in the female by length of the fork I petiole (shorter in T. misakianus ) and absence of the transverse vein r -m in the hind wing (present in T. misakianus ). In the male, Triplectides buengkanensis sp. nov. can be distinguished from these species by tergum X being obliquely truncate in dorsal view (suboval in T. indicus and T. misakianus ) and having a shallow V-shaped apicomesal incision (deep in T. misakianus , T. nessimiani , and T. indicus ), the absence of striae on the basomesal lobes of the inferior appendages (present in T. nessimiani ), and the suboval phallotremal sclerite (subpentagonal in T. nessimiani ).

Material examined. Holotype. 1 male. THAILAND: Bueng Kan Province, Bueng Khong Long District, Bueng [= Swamp] Khong Long ; 18.02334° N, 104.01569° E; 168 m; 4.ii.2023; light trap; K. Wangwasit, P. Bunchalee & I. Thanee; Department of Biology , Faculty of Science , Mahasarakham University, Thailand. GoogleMaps

Paratypes. Same data as holotype, except 11 males, 4 females; GenBank no: PQ009803–PQ009817 (COI) GoogleMaps .

Description. Adult male ( Figs 3A–3C View FIGURE 3 ). Forewing length 11.0 mm– 12.5 mm ( Fig. 3B View FIGURE 3 ), body 7.5–9 mm (n = 12). Adult female ( Figs 4A–4C View FIGURE 4 ). Forewing length 11.4–15 mm ( Fig. 4B View FIGURE 4 ), body 8–11 mm (n = 11). In both sexes, body generally appearing yellowish brown on head, thorax, forewing, abdomen, and legs in alcohol-preserved material. Tibial spur formula 2:2:2—forelegs, midlegs, and hind legs respectively—in both sexes. Wing venation similar in male and female except male forewing with R4+5 straight behind discoidal cell and apical fork III absent, female forewing with R4+5 angled posterad subapically at r-m crossvein behind discoidal cell as in several Australian species ( Morse & Neboiss 1982) and apical fork III present.

Male genitalia ( Figs 5A–5E View FIGURE 5 ). Segment IX (IX), in lateral view, tall, longitudinally short, subrectangular, longer dorsally than ventrally, constricted at 3/4 height with acute incisions on anterior and posterior margins, posterior margins projecting and triangular at 2/3 height. In dorsal view, tergum IX subpentagonal with posterior margin almost rounded, with tiny notch and membranous digitate median processes ( Fig. 5B View FIGURE 5 ). Preanal appendages (pr. ap.) long and slender, 3/4 as long as tergum X, blunt apically, with many setae ( Figs 5A, 5B View FIGURE 5 ). Tergum X (X), in lateral view, wide basally, with dorsal and ventral margins almost straight, apex round ( Fig. 5A View FIGURE 5 ); in dorsal view, slightly tapering posterad, bearing short lateral and apical setae, apex obliquely truncate, with shallow, V-shaped incision ( Fig. 5B View FIGURE 5 ). In lateral view ( Fig. 5A View FIGURE 5 ), apicodorsal lobe of first article of each inferior appendage long, extending beyond hooked second article (2nd art.) and tergum X, bearing long setae; in ventral view ( Fig. 5C View FIGURE 5 ), first article broad basally with blunt subtriangular basomesal lobe, second article crescent-shaped, wide at base, tapering apically, sharply curved inward, with pointed apex. In lateral and ventral views ( Figs 5A, 5C View FIGURE 5 ), basoventral lobe of each inferior appendage, long, shorter than preanal appendages, apically round, with long setae. In lateral view ( Fig. 5D View FIGURE 5 ), phallic apparatus long, tubular, thicker near middle, curved upward apically; in dorsal view, bulb-like, with small phallotremal sclerite and pair of wide apices ( Fig. 5E View FIGURE 5 ).

Female genitalia ( Figs 6A–6C View FIGURE 6 ). In lateral view ( Fig. 6A View FIGURE 6 ), tergum IX subrectangular, with sclerotized concave area posterolaterally, sternum smaller; in dorsal view ( Fig. 6B View FIGURE 6 ), subtriangular, round apically, and with pair of small papillae posteriorly. In lateral and dorsal views ( Figs 6A, 6C View FIGURE 6 ), appendages of segment X (X ap.) long and oval, with many setae; sensilla-bearing processes almost 1/2 as long as preanal appendages, blunt apically, each with 6 or 7 short, stout setae apically. In lateral view ( Fig. 6A View FIGURE 6 ), valves (v.) semicircular, round apically, each with short setae ventrolaterally. In ventral view ( Fig. 6C View FIGURE 6 ), gonopod plate (go.pl.) sub-rectangular, with blunt anterolateral angles and round posteriorly. In ventral view ( Fig. 6C View FIGURE 6 ), internal vaginal apparatus (v. a.) subrectangular, twice as long as broad.

Immature stages. Unknown

Distribution. Thailand (Buengkan Province).

Etymology. The specific epithet, buengkanensis , refers to the type locality of the species, Buengkan Province, in northeast Thailand.