Trichadenotecnum tigrinum Yoshizawa & Lienhard, 2015, n. sp.

Trichadenotecnum tigrinum n. sp.

(Figs 1 A, 2)

Holotype. Male, THAILAND Nakhon Nayok, Khao Yai NP, Nhong ping khaokeaw, 14º 23.094N 101º 23.055E, 733m, Malaise trap 5–12.iii.2007, Wirat Sukho leg. T2101 (tiger7M, KY436) (will be deposited in the Queen Sirikit Botanical Gardens, Thailand).

Paratypes (will be deposited in the Queen Sirikit Botanical Gardens, Muséum d'histoire naturelle Geneva, and Hokkaido University). [THAILAND] 1 male, Phetchabun, Khao Kho NP, mixed deciduous forest, 16º 32.546N 101º 2.501E, 560m, Malaise trap 26.xii.2006 – 2.i.2007, Somchai Chachumnan & Saink Singiong leg. T1189; 1 male, Chaiyaphum, Tat Tone NP, by the stream, 15º 58.771N 102º 2.397E, 305m, Malaise trap 19–26.i.2007, Tawit Jaruphan & Orawan Budsawong leg. T1564; 2 males, Chaiyaphum, Tat Tone NP, Phu hang sing, 15º 58.723N 102º 2.231E, 290m, Malaise trap 5–12.i.2007, Tawit Jaruphan & Irwin Budsawong leg. T1560; 1 female, same data as for holotype (tiger7F, KY474); 1 male, same locality as for holotype, 12–19.iii.2007, Wirat Sukho leg. T2104.

Description. Male. Head. White in ground color; vertical markings blackish brown, each marking fused with neighbors; with pair of brown markings anterior to vertical markings next to ocellar field; orbital markings small, brown; coronal suture black; epicranial suture narrowly bordered with blackish brown band dorsally; frons with pair of pale brown markings medially and black small spots laterally; eyes black, IO/D = 1.1; ocelli white, ocellar field dark brown; gena white, medially with blackish brown marking; postclypeus with rows of blackish brown spots, rows fused to each other ventrally, dorsal margin and ventrolateral corners white; anteclypeus blackish brown. Antenna brown. Mouthparts brown.

Thorax. Prothorax brown. Mesonotum mostly brown, medially with white field, marking on anterior lobe bilaterally divided by narrow white stripe. Mesopleuron white, precoxal bridge and trochantin blackish brown. Metanotum brown, medially with white spot, scutellum darker. Metapleuron blackish brown except for white membranous region.

Legs. Coxae blackish brown; femora white, each with black spot ventrally at apical 1/3; tibiae white to pale brown; tarsi brown, second segments darker.

Forewing (Fig. 1 A). As in group diagnosis; distal spot in cell a well developed; spot on roof of m3 apparent only in basal half; submarginal spot obscure in cell m3; roof vein of cell m3 short, about half of second section of CuA 1 in length.

Terminalia. Eighth sternum with weak sclerite separated from hypandrium (Fig. 2 A). Epiproct lobe bilobed, slightly expanded over clunium, medially with cylindrical process strongly pointed dorsally; dorsal margin smooth (Fig. 2 AB). Paraproct with small basal conical process; distal process long, almost straight (Fig. 2 A). Hypandrium (Fig. 2 C) with broad membranous region medially, anteroventral surface weakly projecting ventrally, medially covered with papillae; left corner without significant modification; left process long and straight; median tongue well developed, movable, bifurcated distally, its left lobe covered by denticles, right lobe smooth; right process well developed, covered by denticles distally, outer margin serrated basally; right corner without significant modification. Phallosome (Fig. 2 D) pointed anteriorly, posteriorly pointed and narrowly open.

Measurements. Body 1.4–1.7 mm, forewing 2.3–2.4 mm, hindwing 1.7–1.9 mm.

Female. General morphology almost as in male. IO/D = 1.2.

Genitalia. Subgenital plate (Fig. 2 E). Egg guide broad basally, gradually narrowing to middle and parallel sided in distal half, distal margin slightly arched, dorsally with lateral sclerites at broadened base; body of subgenital plate with broad membranous region anteriorly, narrowly incising to middle of egg guide. Gonapophyses (Fig. 2 F). Ventral valve long; dorsal valve with long and narrow distal process; external valve with well developed posterior lobe, anteriorly with membranous region. Spermapore plate not well sclerotized.

Measurements. Body 1.7 mm, forewing (from base to Rs fork) 1.4 mm (apically broken), hindwing (from base to R-M fork) 1.0 mm (distally broken).

Distribution. Thailand.

Etymology. The species epithet refers to the TIGER (Thailand Inventory Group for Entomological Research) project, through which the present material was collected.

Remarks. The hypandrial structure of this species is very similar to T. cynostigmus, but these species differ clearly in the shapes of the epiproct lobe (simple in T. cynostigmus, trilobed in T. tigrinum) and the phallosome (posterior end flattened and closed in T. cynostigmus, pointed and narrowly opened in T. tigrinum). The trilobed structure of the epiproct lobe of this species is similar to T. marginatum (three swellings were shown by New & Thornton, 1976: fig. 130), but these species differ in the shapes of the phallosome (posterior end wide and straight in T. marginatum, as in T. cynostigmus) and the hypandrium. T. marginatum clearly differs from T. cynostigmus by the characters of the hypandrium. The female of the marginatum species group is described here for the first time.