Karnyothrips triconus, Okajima & Masumoto, 2025

Karnyothrips triconus sp. n.

( Figs 37–39 View FIGURES 31–40 , 221–226 View FIGURES 221–226 )

Female (macroptera). Distended body length: 2.0– 2.4mm. Bicolored species ( Fig. 37 View FIGURES 31–40 ); head, thorax, abdominal segments VIII – IX and tube brown to dark brown, but abdominal segment VIII with anterior portion yellowish; abdominal segments I– VII largely yellow, segments II – VII each with a median brown marking along antecostal suture, the markings are variable in each specimen, small to large as well as pale to dark. Fore femora brown, almost concolorous with head, with apices yellowish, mid and hind femora pale brown, with apices yellowish; all tibiae and tarsi yellow.Antennal segments I and II pale brown, a little paler than head, segment III yellow, IV – VIII pale brown to brown, gradually darkened distally, segments IV and V with bases slightly paler. Fore wings scarcely tinged with pale brown; major body setae pale. Head a little longer than 1.4 times as long as wide ( Fig. 221 View FIGURES 221–226 ), 1.44 times in holotype, dorsal surface almost smooth, often very weakly sculptured with transverse striae at middle between postocular setae. Cheeks very weakly rounded, sub-parallel, weakly serrate. Postocular setae shorter than eyes, expanded at apex, 120µm apart from each other, 15–16µm apart from eyes in holotype. Eyes about 0.3 times as long as head, 0.30–0.31 times in holotype. Ocelli well developed; posterior pair 33µm apart from each other in holotype. Antennae about 1.7 times as long as head; segment VIII weakly constricted basally ( Fig. 225 View FIGURES 221–226 ), narrowly fused to segment VII; segment III with sub-basal swelling ( Fig. 226 View FIGURES 221–226 ), almost as long as segment VI; segment IV the longest, much longer than VII; segments III and IV with two (1+1) and three (1+2 +1) sense cones respectively. Maxillary stylets crossing over postocular setae, but hardly reaching eyes, close together medially, their distance less than one-fifth of head width, 27µm apart from each other in holotype; maxillary bridge rather distinct. Pronotum about 0.7 times as long as head, 1.41 times as wide as long in holotype, almost smooth; four pairs of prominent setae expanded; aa and pa subequal in length, ml longer than pa, epim the longest, longer than postoculars. Notopleural sutures complete. Prospinasternum large, 45µm wide in holotype; mesopresternum divided into two lateral triangle plates ( Fig. 223 View FIGURES 221–226 ). Metanotum almost smooth, but very weakly sculptured medially with longitudinal striae; median pair of setae weak, short and acute, less than 20µm in length, 45µm apart from each other, 55µm apart from anterior margin. Fore wing with 6–8 duplicated cilia; three sub-basal setae expanded, S1 the shortest, S2 and S3 subequal in length. Pelta trapezoid ( Fig. 224 View FIGURES 221–226 ), sculptured weakly, about 1.1 times as wide as long. Tergite IX S1 and S2 setae subequal in length, sharply pointed, almost as long as tube or a little longer. Tube about half as long as head, 1.88 times as long as wide in holotype. Terminal setae about 1.7 times as long as tube .

Measurements (holotype female in µm). Body length about 2300 (distended). Head length 220, from anterior margin of eyes 207, width across eyes 146, maximum width across cheeks 153; eyes length 66–68, width 40–44; diameter of posterior ocelli 13–16; postocular setae 55–57. Maxillary bridge width 35. Antenna total length 375, segments III–VIII length (width) as follows: 43 (30), 52 (29), 47 (26), 42 (24), 45 (23), 32 (13). Pronotum length 158, width 222. Setae on prothorax: aa 45, ml 55, pa 43–45, epim 66–70. Fore wing length 850. Sub-basal wing setae: S1 37 –38, S2 42, S3 42 –43. Pelta length 85, width 93. Tergite IX setae: S1 115–117, S2 115–120. Tube length 113, maximum width 60; terminal setae 187–190.

Male (macroptera). Distended body length: 1.9–2.0mm. Very similar in structure to macropterous female. Abdominal segments I–VI somewhat darker than female ( Figs 38 & 39 View FIGURES 31–40 ), but often very similar to female, median brown shadings largely developed; segment VII almost entirely brownish, but a little paler than VIII. Head about 1.4 times as long as wide ( Fig. 222 View FIGURES 221–226 ). Fore wing with 2–6 duplicated cilia. Tube 0.53–0.56 times as long as head.

Measurements (paratype male in µm). Body length about 2000 (distended). Head length 200, from anterior margin of eyes 187, width across eyes 133, maximum width across cheeks 140; eyes length 62–64, width 36–37; diameter of posterior ocelli 12–13; postocular setae about 50. Maxillary bridge width 30. Antenna total length 355, segments III–VIII length as follows: 44, 50, 46, 42, 43, 30. Pronotum length 147, width 207. Setae on prothorax: aa 43–47, ml 50–55, pa 42–45, epim 58–60. Fore wing length 730. Sub-basal wing setae: S1 35 –36, S2 38 –42, S3 40 –44. Pelta length 77, width 83. Tergite IX setae: S1 108–110, S2 35 –40. Tube length 108, maximum width 55; terminal setae 175–182.

Type material. Holotype: macropterous female, Taiwan, Pintung Hsien , Kenting Nat. Park, on dead branches, 19.iii.1984, SO . Paratypes: Taiwan, 7 females (mac.) and 5 males (mac.), collected together with holotype ; 1 female (mac.), same locality as holotype , on dead Palmae fronds, 7.ix.1993, TN & SO.

Non-paratypic specimens. Taiwan, 1 female (mac.) and 1 male (mac.), Taitung Hsien, Chihpen , on dead wood, 10.ix.1993, TN & SO .

Comments. This species is described based on several macropterous females and males taken from dead branches in Taiwan, and is very similar to K. brevipilosus sp. n. and K. melaleucus in coloration. However, it has a sub-basal swelling on antennal segment III, three sense cones on antennal segment IV, the notopleural sutures complete, the mesopresternum divided into two lateral triangle plates and the tergite IX S1 setae almost as long as the tube, whereas both brevipilosus and melaleucus have no sub-basal swelling on antennal segment III, two sense cones (1+1 +1) on antennal segment IV, the notopleural sutures incomplete, the mesopresternum not divided, and the tergite IX S1 setae longer than the tube.A female and a male listed in the non-paratypic specimens have the maxillary stylets more than one-fourth of head width apart (38–40µm), but are indistinguishable in other structures.