Karnyothrips oppositus, Okajima & Masumoto, 2025

Karnyothrips oppositus sp. n.

( Figs 29 View FIGURES 21–30 , 164–169 View FIGURES 164–169 )

Female (macroptera). Distended body length: 1.5–1.7mm. Brown species ( Fig. 29 View FIGURES 21–30 ). All femora brown, almost concolorous with head or a little paler; all tibiae shaded with pale brown, hind tibiae with apices yellowish. Antennal segments I and VII – VIII brown, concolorous with head, segment II brown, a little paler externally, segment III yellow, often scarcely shaded with brown, segments IV – VI brownish yellow to brown, gradually darkened distally, segments IV and V with bases yellowish. Forewings and major body setae pale. Head 1.45 times as long as wide in holotype ( Fig. 164 View FIGURES 164–169 ) , widest across cheeks at level of postocular setae, dorsal surface almost smooth. Cheeks weakly rounded, serrate. Postocular setae shorter than eyes, expanded at apex, about 95µm apart from each other, 15–16µm apart from eyes in holotype. Eyes about 0.3 times as long as head, 0.29 times as long as head in holotype. Ocelli relatively small, posterior pair slightly separated from eyes, 28µm apart from each other in holotype. Antennae about 1.7 times as long as head; segment VIII conical ( Fig. 168 View FIGURES 164–169 ), wide based, not constricted basally, widely fused to VII, 0.56 times as long as VII in holotype ; segment III shorter than segment VII; segment IV the longest ( Fig. 169 View FIGURES 164–169 ); segments III and IV each with two (1+1) and (1+1 +1) sense cones respectively. Maxillary stylets scarcely reaching eyes, their distance about one-fourth of head width, or a little narrower, 28µm apart from each other in holotype ; maxillary bridge distinct. Pronotum about 0.6 times as long as head, 1.65 times as wide as long in holotype, almost smooth; four pairs of prominent setae expanded; aa and ml subequal in length, epim the longest. Notopleural sutures incomplete, but often nearly complete. Basantra wider than long; mesopresternum divided into lateral two triangle plates; prospinasternum irregularly shaped, inverted triangle, relatively large, about 50µm wide in holotype ( Fig. 166 View FIGURES 164–169 ). Metanotum almost smooth; median pair of setae weak, short and acute, less than 20µm, 28µm apart from each other, 37–40µm apart from anterior margin. Fore wing without duplicated cilia; sub-basal setae expanded, subequal in length. Pelta trapezoid or nearly bell-shaped ( Fig. 167 View FIGURES 164–169 ), sculptured weakly, 1.09 times as wide as long in holotype. Tergite IX S1 setae expanded, shorter than tube, S2 sharply pointed, much longer than tube. Tube longer than half of head length, a little shorter than half as long as head, 0.47 times in holotype , 1.75 times as long as wide in holotype. Terminal setae a little longer than 2.0 times as long as tube, 2.21 times in holotype.

Measurements (holotype female in µm). Body length about 1500 (distended). Head length 178, from anterior margin of eyes 165, width across eyes 120, maximum width across cheeks 123; eyes length 52; diameter of posterior ocelli 9–12; postocular setae 37–38. Maxillary bridge width 33. Antenna total length 310, segments III–VIII length (width) as follows: 38 (25), 42 (26), 39 (23), 35 (21), 41 (19), 23 (15). Pronotum length 103, width 170. Setae on prothorax: aa about 30, ml about 30, pa 33–34, epim 40. Fore wing length 550. Sub-basal wing setae: S1 25 –27, S2 27 –28, S3 25 –29. Pelta length 58, width 63. Tergite IX setae: S1 67–68, S2 145–147. Tube length 84, maximum width 48; terminal setae 186.

Male (macroptera). Body length about 1.0mm, but this male is not distended. Very similar to macropterous female in color and structure. Head about 1.4 times as long as wide ( Fig. 165 View FIGURES 164–169 ). Antennal segment VII longer than segment IV, about 0. 6 times as long as segment VII. Terminal tube setae about 0.3 times as long as tube.

Measurements (paratype male in µm). Body length 1020 (not distended). Head length 159, from anterior margin of eyes 152, width across eyes 110, maximum width across cheeks 115; eyes length 50; diameter of posterior ocelli 10–12; postocular setae 35. Maxillary bridge width 42. Antenna total length 290, segments III–VIII length as follows: 36, 39, 39, 34, 42, 25. Pronotum length 93, width 155. Setae on prothorax: aa about 30, ml about 30, pa 30, epim 40. Fore wing length 530. Sub-basal wing setae: S1 28 –30, S2 30, S3 30. Pelta length 48, width 55. Tergite IX setae: S1 63–65, S2 23 –24. Tube length 75, maximum width 43; terminal setae 172.

Type material. Holotype: macropterous female, Thailand, Hadyai (= Hatyai), on dead leaves and branches, 28.viii.1991, TN & SO . Paratypes: Thailand, 1 female (mac.) and 1 male (mac.), collected together with holotype; Phuket Is., Phuket Hill , on bamboo, 9.ix.1992, TN & SO . Vietnam, 1 femle (mac.), Lam Dong Prov., Bao Loc, Bam Bri, 27.xii.2001, SO; 1 female (mac.), Nghe An Prov., Thanh Chuong District , Thanh An , Cau Cau , ca 40m alt., 9.viii.2007, SO .

Comments. This species is described based on four female and one male macropterae taken from dead leafy branches in southern Thailand and Vietnam. It has antennal segment III swollen sub-basally and segment IV with two major sense cones, a combination of features that is shared with K. acutus sp. n. from Thailand and Taiwan described above, also K. inflatus from the subtropical region of Japan. From acutus it is easily distinguished by having the tergite IX S1 setae with expanded apices. From inflatus it is also easily distinguished by the shape of the antennal segments II and III and shorter tube. Moreover, although both acutus and inflatus have duplicated cilia on the fore wing, oppositus has no duplicated cilia.