Xyphandrothrips septemfidus, Okajima & Masumoto, 2025

Xyphandrothrips septemfidus sp. nov.

( Figs 357 View FIGURES 349–358 , 415–422 View FIGURES 415–422 )

Female (macroptera). Distended body length: about 1.8mm. Body bicolored brown and yellow ( Fig. 357 View FIGURES 349–358 ). Head and tube brown, head scarcely paler at base, basal one-third of tube yellowish; the rest of body yellow. Legs yellow. Antennal segments VI–VIII brown, extreme base of segment VI yellowish; segment V pale brown, with basal quarter yellow; the remaining segments largely yellow, but segment I and IV scarcely shaded. Fore wings and major body setae pale. Head ( Fig. 415 View FIGURES 415–422 ) longer than wide, about 1.2 times as long as wide, widest across cheeks; dorsal surface almost smooth. Cheeks very weakly rounded, gradually narrowed towards base, very weakly serrated. Eyes about one-third of head length. Posterior ocelli slightly separated from eyes, 25µm apart from each other. Postocular setae shorter than eyes, weakly expanded; 128µm apart from each other, about 21–22µm apart from eyes. Antennae ( Fig. 422 View FIGURES 415–422 ) about 1.7 times as long as head; 7-segmented, morphological segments VII and VIII completely fused, but with incomplete suture between them; segments III a little short er than IV; segments III and IV with one (0+1) and four (2+2 +1) sense cones respectively. Maxillary stylets retracted to eyes, close together at middle, 22µm apart from each other; maxillary bridge invisible even if using the phase contrast microscope. Pronotum ( Fig. 415 View FIGURES 415–422 ) 0.75 times as long as head, about 1.4 times as wide as long; almost smooth; four pairs of prothoracic setae developed and expanded, but am reduced to discal setae; ml and pa subequal in length, epim the longest. Prospinasternum ( Fig. 416 View FIGURES 415–422 ) widely fan-shaped, 33µm wide; mesopresternum divided. Mesonotal lateral setae reduced. Metanotum ( Fig. 417 View FIGURES 415–422 ) weakly sculptured with polygonal reticulation; median pair of setae pointed, shorter than 20µm, distance between both median setae narrower than distance between that seta and anterior margin of metanotum, 41µm apart from each other,48–50µm apart from anterior margin. Fore tarsal tooth long and slender ( Fig. 419 View FIGURES 415–422 ). Fore wing with 5–6 duplicated cilia; three sub-basal setae relatively short, S1 and S2 expanded, S3 pointed. Pelta ( Fig. 418 View FIGURES 415–422 ) weak, trapezoid, about 1.4 times as wide as long. Tergites III–VIII S2 setae: III–VI and VIII expanded, VII sharply pointed. Tergite IX S1 and S2 setae pointed, S1 shorter than tube, S2 a little shorter than tube or almost as long as tube; intermediate setae shorter than half of Sl. Tube ( Fig. 421 View FIGURES 415–422 ) shorter than 0.55 times as long as head, about 2.1 times as long as wide; terminal setae about 1.2 times as long as tube.

Measurements (holotype female in µm). Body length about 1800 (distended). Head length 193, from anterior margin of eyes 178, width across eyes 152, maximum width across cheeks 162, minimum width across base 132; eyes length 66; diameter of posterior ocelli 13–16; postocular setae 50–54. Antenna total length 330, segments III–VII (= morphological VII + VIII) length (width) as follows: 45 (26), 48 (30), 43 (25), 38 (22), 60 (22). Pronotum length 144, width 200. Setae on prothorax: aa about 20, ml 35, pa 34, epim 45–48. Fore wing length 650. Sub-basal wing setae: S1 25 –27, S2 25 –26, S3 28 –31. Pelta length 68, width 96. Tergite IX setae: S1 85–90, S2 100–110. Tube length 107, maximum width 52; terminal setae 120–125.

Male (macroptera). Distended body length: 1.45mm. Very similar to macropterous female in color and structure. Fore wing with 5–6 duplicated cilia.

Measurements (paratype male in µm). Body length about 1450 (distended). Head length 172, from anterior margin of eyes 157, width across eyes 134, maximum width across cheeks 141, minimum width across base 111; eyes length 57; diameter of posterior ocelli 12–15; postocular setae 40–43. Antenna total length 290, segments III–VII (= morphological VII + VIII) length as follows: 39, 40, 38, 35, 54. Pronotum length 125, width 180. Setae on prothorax: aa shorter than 20, ml about 30, pa 30, epim 40. Fore wing length 600. Sub-basal wing setae: S1 22 –25, S2 22, S3 20 –30. Pelta length 58, width 82. Tergite IX setae: S1 60 –65, S2 34 –35. Tube length 88, maximum width 47; terminal setae 100–110.

Type material. Holotype: macropterous female, Peninsular Malaysia, about 20km N from Kuala Lumpur, on dead leaves of bamboo, 13.viii.1990, TN & SO . Paratype: Peninsular Malaysia, 1 male, data very similar to holotype, but 12.viii.1990 .

Doubtful specimens. Indonesia, Bali, 2 males, Tabanan, Jatiluwih (Peteli Temple), 867–915m alt., on dead branches, 14.iii.2005, SO .

Comments. This species is described from Peninsular Malaysia based on one female and one male taken from dead bamboo leaves, and is peculiar within the genus in having the antennae 7-segmented. Morphological antennal segments VII and VIII are completely fused, except for an incomplete suture between them. Two males listed under doubtful specimens taken from Bali, Indonesia, are very similar to septemfidus , but have the head largely yellowish .