Karnyothrips infectus, Okajima & Masumoto, 2025

Karnyothrips infectus sp. n.

( Figs 20 View FIGURES 6–20 , 98–103 View FIGURES 98–103 )

Female (macroptera). Distended body length: 1.7–1.9mm. Brown species ( Fig. 20 View FIGURES 6–20 ). Largely brown. All femora brown with apices yellowish; tibiae yellowish, fore and mid tibiae tinged with pale brown; tarsi yellow. Antenna brown, segment II paler anteriorly, segment III brownish yellow, slightly darkened anteriorly, IV with pedicel yellowish. Wings weakly shaded with brown, but paler at bases and apices; major body setae pale. Head about 1.5 times as long as wide ( Fig. 98 View FIGURES 98–103 ), 1.52 times in holotype , dorsal surface almost smooth. Cheeks weakly rounded, weakly serrate. Postocular setae shorter than eyes, expanded at apex, 105µm apart from each other, 13–15µm apart from eyes in holotype. Eyes about one-third of head length, 0.33 times in holotype. Ocelli relatively small; posterior pair slightly separated from eyes, 28µm apart from each other in holotype. Antennae about 1.6 times as long as head; segment VIII scarcely constricted basally ( Fig. 102 View FIGURES 98–103 ), 0.64 times as long as VII; segment VII shorter than III; segment IV the longest, a little longer than III ( Fig. 103 View FIGURES 98–103 ); segments III and IV with two (1+1) and four (2+2 +1) sense cones respectively. Maxillary stylets crossing over postocular setae, but not reaching eyes, relatively wider apart, their distance about one-fourth of head width, 35µm apart from each other in holotype ; maxillary bridge distinct. Pronotum about 0.6 times as long as head, 1.42 times as wide as long in holotype, almost smooth; four pairs of prominent setae expanded; pa longer than aa, aa and ml subequal, epim the longest, longer than postoculars. Notopleural sutures complete. Basantra wider than long; mesopresternum divided into two lateral triangle plates; prospinasternum relatively large, fan-shaped, about 40µm in width ( Fig. 100 View FIGURES 98–103 ). Metanotum weakly sculptured medially with longitudinal reticulation; median pair of setae weak, short and acute, less than 20µm in length, 44µm apart from each other, about 50µm apart from anterior margin. Fore wing with 5–6 duplicated cilia; three sub-basal setae expanded, S1 and S2 subequal in length, S3 the longest. Pelta trapezoid ( Fig. 101 View FIGURES 98–103 ), sculptured weakly, 1.07 times as wide as long in holotype. Tergite IX S1 and S2 setae sharply pointed, S1 longer than tube, S2 much longer than tube. Tube a little shorter than half of head length, 1.8 times as long as wide in holotype . Terminal setae longer than 2.0 times as long as tube, about 2.2 times as long as tube in holotype.

Measurements (holotype female in µm). Body length 1900 (distended). Head length 200, from anterior margin of eyes 185, width across eyes 131, maximum width across cheeks 132; eyes length 65; diameter of posterior ocelli 11–13; postocular setae about 40. Maxillary bridge width 38. Antenna total length 320, segments III–VIII length (width) as follows: 45 (26), 47 (27), 40 (24), 37 (22), 39 (21), 25 (12). Pronotum length 122, width 173. Setae on prothorax: aa 33–37, ml?35–37, pa 40–42, epim 50–60. Fore wing length 750. Sub-basal wing setae: S1 40, S2 38 –40, S3 42 –44. Pelta length 71, width 76. Tergite IX setae: S1 105, S2 123–132. Tube length 95, maximum width 53; terminal setae 212.

Male (macroptera). Distended body length: 1.46mm. Very similar to macropterous female in color and structure. Maxillary stylets wider apart, wider than 1/3 of head width, 37µm apart from each other in paratype male. Fore wing with 3–4 duplicated cilia. Tube about half as long as head.

Measurements (paratype male in µm). Body length 1460 (distended). Head length 170, from anterior margin of eyes 157, width across eyes 118, maximum width across cheeks 120; eyes length 53; diameter of posterior ocelli 9–11; postocular setae 42–45. Maxillary bridge width 48. Antenna total length 295, segments III–VIII length as follows: 39, 43, 38, 38, 38, 23. Pronotum length 110, width 168. Setae on prothorax: aa less than 30, ml less than 30, pa 33–37, epim 47–49. Fore wing length 620. Sub-basal wing setae: S1 34 –35, S2 29 –31, S3 29 –32. Pelta length 54, width 70. Tergite IX setae: S1 103–107, S2 30 –32. Tube length 87, maximum width 45; terminal setae 195–193.

Type material. Holotype: macropterous female, the Philippines, Mindanao , Mt. Apo, Agko, alt. about 1300m, on half dead grass, 31.vii.1979, SO . Paratypes: the Philippines, Mindanao , 1 male (mac.), same locality as holotype, on dead leaves, 2.viii.1979, SO ; 1 female (mac.), North Cotabato, Ilomavis , on dead leaves, 29.vii.1979, SO .

Comments. This species was collected together with K. apoensis sp. n. which also has tergite IX S1 setae pointed, but these two species are easily distinguished by the antennal structure, coloration and sense cone formula of segment IV. Antennal segments IV and V are largely yellow in apoensis with two sense cones on segment IV, whereas this species has the antenna largely brown except for segment III and four sense cones on segment IV. K. formosanus is also very similar to this species, despite antennal segment III with a small sub-basal swelling and tergite IX S1 setae sharply pointed.