Karnyothrips vietnamensis, Okajima & Masumoto, 2025

Karnyothrips vietnamensis sp. n.

( Figs 233–239 View FIGURES 233–239 )

Female (macroptera). Distended body length: about 2.0mm. Body brown. Femora brown, fore femora with apices scarcely paler; tibiae and tarsi yellow. Antennal segments I, II, VII and VIII brown; segments III–V yellow, segment V scarcely tinged with brown distally; segment VI pale brown, with basal half yellowish. Fore wing and major body setae pale. Head 1.24 times as long as wide ( Fig. 234 View FIGURES 233–239 ), dorsal surface almost smooth, very weakly sculptured at middle. Cheeks very weakly rounded, weakly serrate. Postocular setae shorter than eyes, expanded, 104µm apart from each other, 12–13µm apart from eyes. Eyes about one-third of head length. Ocelli normal; posterior pair in contact with eyes, about 30µm apart from each other. Antennae about 2.0 times as long as head; segment VIII relatively slender ( Fig. 238 View FIGURES 233–239 ), not constricted basally, about two-third of VII in length; segments III and IV subequal in length ( Fig. 239 View FIGURES 233–239 ), longer than segment VII; segments III and IV with three (1+2) and four (2+2 +1) sense cones respectively. Maxillary stylets reaching postocular setae, relatively wider apart, their distance about 0.3 times as wide as head, 55µm apart from each other at the level of maxillary bridge; maxillary bridge rather distinct. Pronotum 0.77 times as long as head, about 1.5 times as wide as long, almost smooth; four pairs of major setae expanded; aa and ml subequal in length, pa longer than ml, epim the longest, longer than postoculars. Notopleural sutures complete. Basantra wider than long; mesopresternum transverse, not divided; prospinasternum small, 25µm wide ( Fig. 236 View FIGURES 233–239 ). Metanotum sculptured with polygonal reticulation; median pair of setae weak, short and acute, less than 20µm in length, 53µm apart from each other, 42–43µm apart from anterior margin. Fore wing with 6–7 duplicated cilia; three sub-basal setae expanded, S2 the shortest, S3 the longest. Pelta triangle ( Fig. 237 View FIGURES 233–239 ), sculptured distinctly, about 1.4 times as wide as long. Tergite IX S1 setae bluntly pointed, a little longer than tube, S2 sharply pointed, longer than S1. Tube a little longer than 0.65 times as long as head, 1.9 times as long as wide. Terminal setae 1.57 times as long as tube.

Measurements (holotype female in µm). Body length about 2000 (distended). Head length 173, from anterior margin of eyes 173, width across eyes 137, maximum width across cheeks 140, minimum width across base 122; eyes length 57; diameter of posterior ocelli 12–13; postocular setae 40–43. Maxillary bridge width 57. Antenna total length 345, segments III–VIII length (width) as follows: 47 (28), 48 (29), 45 (26), 42 (23), 42 (20), 28 (12). Pronotum length 134, width 200. Setae on prothorax: aa 30–33, ml?30, pa 40, epim 53–55. Fore wing length 730. Sub-basal wing setae: S1 35 –40, S2 30 –36, S3 45 –50. Pelta length 75, width 104. Tergite IX setae: S1 120–125, S2 135–138. Tube length 112, maximum width 59; terminal setae 172–176.

Male. Unknown.

Type material. Holotype: macropterous female, Vietnam, Thua Thien Hue Prov. , Phu Loc District, Bach Ma National Park, 1150m alt., on bamboo, 14.viii.2007, SO.

Comments. This species is described based on a unique holotype female from bamboo in Vietnam. It may be closely related to the widespread species, K. flavipes , but it is distinguished in having a combination of the following features: antennal segments III – V largely yellowish; antennal segments III and IV with three (1+2) and four (2+2 +1) sense cones respectively; mesopresternum transverse, but narrow; tergite IX S1 setae bluntly pointed, longer than tube; terminal tube setae about 1.6 times as long as the tube .