Xyphandrothrips cinctus, Okajima & Masumoto, 2025

Xyphandrothrips cinctus sp. nov.

( Figs 350 View FIGURES 349–358 , 366–373 View FIGURES 366–373 )

Female (macroptera). Distended body length: about 1.4mm. Body bicolored ( Fig. 350 View FIGURES 349–358 ). Head, thorax yellowish brown, tube pale brown; abdominal segment I yellowish at middle, brownish laterally, segment II yellow, segments II–VI largely yellow to brownish yellow, with anterolateral portions brownish, segments VIII and IX brownish yellow. Fore femora brown, scarcely paler than head, with apical one-third yellowish, mid femora pale brown, with apical two-fifths yellow, hind femora yellow; fore tibiae yellowish brown, a little paler than femora, mid and hind tibiae weakly shaded with brown, with bases and apices yellow; tarsi yellow. Antennal segments I and IV–VIII brown, I and IV a little paler, segment IV with base yellowish, segments II and III yellow, but segment II scarcely shaded. Fore wings very weakly shaded with brown. Major body setae pale. Head ( Fig. 366 View FIGURES 366–373 ) a little longer than wide, 1.17 times as long as wide; dorsal surface almost smooth at middle, very weakly sculptured with transverse striae between eyes. Cheeks rounded, gradually narrowed to base, anterior end bulged and shortly overlapping with eyes, weakly serrated. Eyes 0.28 times as long as head. Posterior ocelli almost in contact with eyes, about 27µm apart from each other. Postocular setae much shorter than eyes, expanded; about 90µm apart from each other, 7–8µm apart from eyes. Antennae ( Fig. 373 View FIGURES 366–373 ) short, 1.75 times as long as head; segment VIII conical, not constricted at base, widely and closely joined to segment VII; segment III truncated at apex, shorter than IV, almost as long as VII; segment IV the largest; segments III and IV with two (1+1) and four (2+2 +1) sense cones respectively. Maxillary stylets retracted to eyes, sub-parallel at middle, their distance narrower than one-fifth of head width; maxillary bridge weak. Pronotum ( Fig. 366 View FIGURES 366–373 ) 0.68 times as long as head, about 1.5 times as wide as long; almost smooth, median apodeme very weak; five pairs of prothoracic setae expanded; am and aa subequal in length, ml and pa subequal, almost as long as postocular setae, epim a little longer than pa. Prospinasternum ( Fig. 367 View FIGURES 366–373 ) largely developed, irregularly shaped, 38µm wide; mesopresternum divided into lateral triangles. Mesonotal lateral setae developed, expanded. Metanotum sculptured with polygonal reticulation; median pair of setae pointed, 22–25µm long, distance between both median setae wider than distance between each seta and anterior margin of metanotum, 45µm apart from each other, 30–35µm apart from anterior margin. Fore tarsal tooth long ( Fig. 370 View FIGURES 366–373 ). Fore wing with 4 duplicated cilia; three sub-basal setae relatively short, expanded. Pelta ( Fig. 368 View FIGURES 366–373 ) trapezoid with irregular lateral margins, 1.53 times as wide as long. Tergites III–VIII S2 setae: III–VI expanded, VII pointed, VIII blunt. Tergite IX S1 setae blunt, much shorter than tube, S2 sharply pointed, almost as long as tube; intermediate setae longer than three-quarters of Sl. Tube ( Fig. 372 View FIGURES 366–373 ) 0.5 times as long as head, about 1.9 times as long as wide; terminal setae about 1.4 times as long as tube.

Measurements (holotype female in µm). Body length about 1400 (distended). Head length 160, from anterior margin of eyes 150, width across eyes 128, maximum width across cheeks 137, minimum width across base 106; eyes length 45; diameter of posterior ocelli 10–11; postocular setae 23–24. Maxillary bridge width 25. Antenna total length 280, segments III–VIII length (width) as follows: 33 (22), 40 (26), 37 (22), 36 (20), 33 (20), 20 (12). Pronotum length 108, width 163. Setae on prothorax: am 18–20, aa?20, ml 25, pa 25, epim 29. Fore wing length 540. Sub-basal wing setae: S1 23, S2 20, S3 20. Pelta length 51, width 78. Tergite IX setae: S1 52 –53, S2 80. Tube length 80, maximum width 42; terminal setae?110.

Male (macroptera). Distended body length: 1.33mm. Very similar to macropterous female in structure. Abdominal segments II and IV yellow, segments V–IX yellow, but very weakly shaded with brown; mid and hind tibiae yellow. Maxillary bridge wider, 0.29 times as wide as head; prothorax ( Fig. 369 View FIGURES 366–373 ) and fore legs enlarged ( Fig. 371 View FIGURES 366–373 ), fore tarsal tooth stout. Fore wing with 3–4 duplicated cilia.

Measurements (paratype male in µm). Body length 1330 (distended). Head length 165, from anterior margin of eyes 153, width across eyes 127, maximum width across cheeks 130, minimum width across base 99; eyes length 53; diameter of posterior ocelli 10–12; postocular setae 25. Maxillary bridge width 38. Antenna total length 280, segments III–VIII length as follows: 33, 42, 39, 37, 34, 22. Pronotum length 118, width 167. Setae on prothorax: am 20, aa 25, ml 30, pa 30, epim 30. Fore wing length 540. Sub-basal wing setae: S1 28, S2 25, S3 27. Pelta length 49, width 70. Tergite IX setae: S1?40, S2 20. Tube length 68, maximum width 41; terminal setae 107.

Type material. Holotype: macropterous female, Vietnam, Ninh Thuan Prov., Lam Son District, Root 27 (Pass 1), 900m alt., 23.viii.2007, SO . Paratype: Vietnam, 1 male, collected together with holotype .

Comments. This species is described from Vietnam based on one female and one large male, and it may be related to X. conjunctus from Taiwan. These two species have antennal segments III and IV with three and four major sense cones respectively, the terminal two antennal segments closely and widely joined, and the sub-basal setae S3 expanded. However, in contrast to conjunctus that has a uniformly brown body, cinctus has the body bicolored brown and yellow. Unfortunately, the feeding habitat of this species is uncertain.