Neandrothrips boninae, Okajima & Masumoto, 2025

Neandrothrips boninae sp. nov.

( Figs 107 View FIGURES 102–111 , 144–151 View FIGURES 144–151 )

Female (macroptera). Distended body length: 1.4–1.5mm. Body dark brown ( Fig. 107 View FIGURES 102–111 ). Legs dark brown, but apices of tibiae yellowish ( Fig. 149 View FIGURES 144–151 ); tarsi yellow. Antennal segments I– II and VI – VIII brown; segment III yellow, segment IV brownish yellow; segment V yellowish brown, a little darker than segment IV, with bases paler. Fore wing pale in distal half, scarcely shaded with pale brown in basal half, but paler at base. Major body setae pale. Head ( Fig. 144 View FIGURES 144–151 ) longer than wide, about 1.2 times as long as wide, 1.24 times in holotype; dorsal surface almost smooth at middle. Cheeks subparallel, but distinctly constricted at base. Eyes about one-third as long as head. Ocelli relatively small; posterior pair slightly separated from eyes, 27µm apart from each other in holotype. Postocular setae much shorter than eyes, very weakly expanded or truncated; 103µm apart from each other, 12–13µm apart from eyes in holotype. Antennae ( Fig. 151 View FIGURES 144–151 ) longer than 1.7 times as long as head, 1.75 times in holotype; segment VIII weakly constricted at base, about 0.8 times as long as segment VII, 0.79 times in holotype; segments III almost as long as segment IV, truncated at apex, much longer than VII; segments III and IV with three (1+2) and four (2+2 +1) sense cones respectively. Maxillary stylets retracted to the middle of head capsule, not reaching postocular setae. Maxillary bridge moderately developed, a little wider than one-third of head width, 0.37 times as wide as head in holotype. Pronotum ( Fig. 144 View FIGURES 144–151 ) relatively short, shorter than 0.6 times as long as head, 0.55 times in holotype, 1.8– 1.9 times as wide as long, 1.87 times in holotype; almost smooth, median apodeme very weak; am setae reduced (ml invisible in both holotype and paratypes, and there is a possibility that it is also reduced); aa, pa and epim developed, but short and very weakly expanded or truncated. Prospinasternum ( Fig. 145 View FIGURES 144–151 ) fan-shaped, 33µm wide in holotype; mesopresternum complete. Mesonotal lateral setae short and finely pointed, about 15µm long. Metanotum ( Fig. 146 View FIGURES 144–151 ) sculptured with polygonal reticulation; median pair of setae pointed, 22–23µm long, distance between both median setae narrower than distance between those setae and anterior margin of metanotum, about 30µm apart from each other, 37µm apart from anterior margin in holotype. Fore tarsus with a small tooth ( Fig. 148 View FIGURES 144–151 ). Fore wing with 4–5 duplicated cilia; three sub-basal setae relatively short, expanded, but S3 often blunt. Pelta ( Fig. 147 View FIGURES 144–151 ) trapezoid with irregular lateral margins, 1.64 times as wide as long in holotype. Tergites III – VIII S2 setae: III – V very weakly expanded, but V often blunt, VI and VII usually blunt, VIII very weakly expanded or truncated. Tergite IX S1 and S2 setae blunt, much shorter than tube, S2 a little longer than S1; intermediate setae about two-thirds of Sl. Tube ( Fig. 150 View FIGURES 144–151 ) longer than 0.5 times as long as head, 0.56 times in holotype, about 2.0 times as long as wide; terminal setae a little shorter than tube .

Measurements (holotype female in µm). Body length about 1700 (distended). Head length 186, from anterior margin of eyes 168, width across eyes 146, maximum width across cheeks 150, minimum width across base 129; eyes length 62; diameter of posterior ocelli 11–13; postocular setae 26–28. Maxillary bridge width 55. Antenna total length 325, segments III–VIII length (width) as follows: 46 (27), 45 (28), 39 (25), 39 (23), 38 (20), 30 (13). Pronotum length 103, width 193. Setae on prothorax: am less than 10, aa 15–17, ml?, pa 20–22, epim 26–28. Fore wing length 660. Sub-basal wing setae: S1 25 –27, S2 22, S3 35. Pelta length 62, width 102. Tergite IX setae: S1 64–65, S2 69–70. Tube length 105, maximum width 53; terminal setae 97–98.

Male. Unknown.

Type material. Holotype macropterous female, Japan, Ogasawara, Chichi-jima Is., habitat uncertain, 18.iv.1997, T. Matsumoto & T. Kishimoto . Paratypes: Japan, Ogasawara, 4 females, collected together with holotype .

Comments. This species is distinct in having a combination of the following features: antennal segments III and IV with three (1+2) and four (2+2 +1) sense cones respectively; postocular setae truncate at apex, very weakly expanded; pronotum rather short, shorter than 0.6 times as long as head; pronotal am setae reduced; mesonotal lateral setae short and pointed; metanotal median pair of setae far apart from anterior margin, closer together; terminal tube setae a little shorter than tube. Unfortunately, the habitat of the type material is uncertain. It may be included in the pictipes -group.