Karnyothrips flavescens, Okajima & Masumoto, 2025

Karnyothrips flavescens sp. n.

( Figs 17 View FIGURES 6–20 , 80–85 View FIGURES 80–85 )

Female (microptera). Distended body length: 1.7mm. Bicolored species. Largely yellow, but anterior portion of head, mesothorax, lateral portion of abdominal segment I, anterior half of abdominal segment II and tube pale brown, tube with base yellowish; the rest of body largely yellow, but abdominal segments III–VII each with a median pale brown marking along antecostal suture. Legs yellow. Antennal segment I pale brown, segments IV–VIII pale brown to brown, but segment IV with extreme base yellowish, segments II and III yellow. Major body setae pale. Head about 1.47 times as long as wide ( Fig. 80 View FIGURES 80–85 ), widest across cheeks at middle, dorsal surface almost smooth. Cheeks weakly rounded, weakly serrate. Postocular setae shorter than eyes, expanded at apex, about 90µm apart from each other, 17–18µm apart from eyes. Eyes a little longer than 1/4 of head length. Ocelli relatively small; posterior pair 25µm apart from each other. Antennae about 1.7 times as long as head; segment VIII distinctly constricted at base ( Fig. 84 View FIGURES 80–85 ), narrowly fused to segment VII, 0.72 times as long as VII; segment III almost as long as VII; segments III shorter than IV ( Fig. 85 View FIGURES 80–85 ); segments III and IV each with two sense cones, (1+1) and (1+1 +1) respectively. Maxillary stylets reaching eyes, close together medially, their distance about one-sixth of head width,18µm apart from each other; maxillary bridge weak. Pronotum about 0.61 times as long as head, 1.35 times as wide as long, almost smooth; four pairs of prominent setae expanded; aa and ml subequal in length, shorter than pa, epim the longest, longer than postoculars. Notopleural sutures complete. Basantra wider than long; mesopresternum divided into two lateral small triangle plates; prospinasternum large, 32µm wide ( Fig. 82 View FIGURES 80–85 ). Metanotum very weakly sculptured medially with longitudinal striae or reticulation; median pair of setae weak, short and acute, about 20µm in length, 32µm apart from each other, 34–35µm apart from anterior margin. Pelta trapezoid ( Fig. 83 View FIGURES 80–85 ), sculptured weakly, 1.23 times as wide as long. Abdominal tergites II–VII each with two pairs of sigmoid wing-retaining setae. Tergite IX S1 setae expanded, shorter than tube, S2 sharply pointed, longer than tube. Tube 0.52 times as long as head, 1.94 times as long as wide. Terminal setae about 1.74 times as long as tube.

Measurements (holotype micropterous female in µm). Body length 1720 (distended). Head length 178, from anterior margin of eyes 163, width across eyes 111, maximum width across cheeks 121, minimum width across base 103; eyes length 47; diameter of posterior ocelli 8–11; postocular setae 35–40. Maxillary bridge width 25. Antenna total length 300, segments III–VIII length (width) as follows: 35 (25), 42 (27), 38 (23), 35 (22), 36 (20), 26 (12). Pronotum length 109, width 147. Setae on prothorax: aa 30–35, ml 33–35, pa 40–41, epim 48–50. Pelta length 57, width 70. Tergite IX setae: S1 75–77, S2 110. Tube length 93, maximum width 48; terminal setae 162.

Male (microptera). Distended body length: 1.4mm. Color very similar to micropterous female, but somewhat paler; antennal segment I yellowish; intermediate abdominal tergite without brown markings. Head weakly narrowed anteriorly ( Fig. 81 View FIGURES 80–85 ), 1.52 times as long as wide; maxillary stylets about 1/5 of head width apart, 23µm apart from each other. Pronotum 0.58 times as long as head, 1.44 times as wide as long.

Measurements (paratype micropterous male in µm). Body length 1380 (distended). Head length 167, from anterior margin of eyes 152, width across eyes 98, maximum width across cheeks 110, minimum width across base 95; eyes length 47; diameter of posterior ocelli 8–9; postocular setae 33–35. Maxillary bridge width 27. Antenna total length 275, segments III–VIII length as follows: 35, 37, 35, 32, 32, 25. Pronotum length 97, width 140. Setae on prothorax: aa?30, ml?30, pa 35, epim 47–48. Pelta length 48, width 67. Tergite IX setae: S1 70, S2 25 –27. Tube length 75, maximum width 44; terminal setae 150.

Type material. Holotype: micropterous female, Vietnam, Thua Thien Hue Prov. , Phu Loc District, Back Ma National Park, ca 1150m alt., on bamboo, 14.viii.2007, SO . Paratype: Vietnam, 1 male (mic.), collected together with holotype .

Comments. This species is described based on micropterous one female and one male collected from bamboo in Vietnam. It has the body bicolored brown and yellow, antennal segment IV with two sense cones (1+1 +1) and tergite IX S1 setae expanded. This combination of features is shared only with K. submaculatus sp. n. described below from Taiwan, but is easily distinguished by the largely yellowish head and prothorax including fore legs. The color pattern of flavescens is very similar to K. micans comb. n. described from India (Ananthakrishnan & Jagadish, 1970; Pitkin, 1976). However, micans has four major sense cones, (2+2 +1), on antennal segment IV, whereas flavescens has only two major sense cones.