Xyphandrothripss amamianus, Okajima & Masumoto, 2025

Xyphandrothripss amamianus sp. nov.

( Figs 349 View FIGURES 349–358 , 359–365 View FIGURES 359–365 )

Female (macroptera). Distended body length: about 1.5mm. Body dark brown ( Fig. 349 View FIGURES 349–358 ). Femora brown to dark brown; tibiae brown, mid and hind tibiae with apices scarcely paler; tarsi yellowish. Antennal segments I and II brown, slightly paler than head; segments V–VIII dark brown, almost concolorous with head; segment III yellow; segment IV brown, with basal one-third somewhat paler. Fore wings scarcely shaded with brown. Major body setae pale. Head ( Fig. 359 View FIGURES 359–365 ) almost as long as wide, 1.04 times as long as wide, widest just behind eyes; dorsal surface weakly sculptured with reticulation, but almost smooth at middle. Cheeks rounded, weakly serrated. Eyes about 0.3 times as long as head. Posterior ocelli scarcely separated from eyes, 27µm apart from each other. Postocular setae shorter than eyes, pointed; 107µm apart from each other, about 9–10µm apart from eyes. Antennae ( Fig. 365 View FIGURES 359–365 ) about 1.8 times as long as head; segment VIII conical, widely and closely joined to segment VII, a little longer than 0.7 times as long as VII; segment III shorter than IV, longer than VII; segments III and IV with two (1+1) and four (2+2 +1) sense cones respectively. Maxillary stylets reaching postocular setae, 30µm apart from each other at a level of maxillary bridge; maxillary bridge very weak. Pronotum ( Fig. 359 View FIGURES 359–365 ) 0.67 times as long as head, 1.66 times as wide as long, almost smooth; five pairs of prothoracic setae developed, am pointed, but remaining four pairs expanded. Prospinasternum ( Fig. 360 View FIGURES 359–365 ) irregularly fan-shaped, 27µm wide; mesopresternum divided. Mesonotal lateral setae about 20µm long, pointed. Metanotum ( Fig. 361 View FIGURES 359–365 ) very weakly sculptured with polygonal reticulation; median pair of setae finely pointed, longer than 20µm, 52µm apart from each other, 33–35µm apart from anterior margin of metanotum. Fore tarsal tooth long and slender ( Fig. 363 View FIGURES 359–365 ). Fore wing with 2–3 duplicated cilia; three sub-basal setae relatively short, S1 and S2 expanded, S3 sharply pointed, the longest. Pelta ( Fig. 362 View FIGURES 359–365 ) trapezoid with rounded anterior margin, 1.6 times as wide as long. Tergites III–VIII S2 setae pointed. Tergite IX S1 setae blunt, a little shorter than S2, S2 finely pointed, shorter than tube; intermediate setae a little longer than half of Sl. Tube ( Fig. 364 View FIGURES 359–365 ) 0.51 times as long as head, 1.84 times as long as wide; terminal setae about 1.1 times as long as tube.

Measurements (holotype female in µm). Body length 1480 (distended). Head length 163, from anterior margin of eyes 155, width across eyes 143, maximum width across cheeks 157, minimum width across base 125; eyes length 48; diameter of posterior ocelli 11–12; postocular setae 30–37. Maxillary bridge width?. Antenna total length 290, segments III–VIII length (width) as follows: 35 (24), 40 (27), 37 (25), 35 (25), 30 (22), 22 (14). Pronotum length 110, width 183. Setae on prothorax: am 23–25, aa?25, ml 27, pa 33, epim 30. Fore wing length 610. Sub-basal wing setae: S1 22 –25, S2 27 –28, S3 31 –33. Pelta length 55, width 88. Tergite IX setae: S1 57 –58, S2 60 –63. Tube length 83, maximum width 45; terminal setae 92.

Male. Unknown.

Type material. Holotype: macropterous female, Japan, Ryukyus , Amami Is , Sumiyou-son, Amami-chuourindou, on dead leaves and branches, 26.iii.1990, SO.

Comments. This species is described from Amami-ohshima Is., the Ryukyu Islands, Japan, based on a unique macropterous female and is very similar to X. conjunctus sp. nov. described below from Taiwan. However, it is easily distinguished from the latter by the following features: head somewhat broader; antennal segment VII much shorter than segment III; postocular setae, prothoracic am setae and postero-lateral setae S2 on tergites III–VI pointed; tube about 0.5 times as long as head; terminal setae about 1.1 times as long as tube.