Neandrothrips ilomavisae, Okajima & Masumoto, 2025

Neandrothrips ilomavisae sp. nov.

( Figs 109–110 View FIGURES 102–111 , 159–168 View FIGURES 159–168 )

Female (macroptera). Distended body length: 1.4–1.6mm. Body brown ( Fig. 109 View FIGURES 102–111 ). All femora brown; all tibiae pale brown with bases and apices paler; tarsi yellow. Antenna brown, segment III yellowish brown, often brown, with extreme base yellow. Fore wing shaded with pale brown. Major body setae pale. Head ( Fig. 159 View FIGURES 159–168 ) longer than wide, about 1.3 times as long as wide, 1.29 times in holotype ; dorsal surface almost smooth at middle, weakly sculptured laterally with transverse striae. Cheeks very weakly rounded, constricted at base, weakly incut at anterior end, weakly serrated. Eyes about one-third of head length. Ocelli moderately developed; posterior pair separated from eyes, 19µm apart from each other in holotype . Postocular setae shorter than eyes, expanded; 84µm apart from each other, about 10µm apart from eyes in holotype . Antennae ( Fig. 168 View FIGURES 159–168 ) 1.7–1.8 times as long as head, 1.75 times in holotype ; segment VIII relatively slender, weakly constricted at base, about three-fouths of segment VII, or a little longer; segments III shorter than IV, almost as long as VII; segment IV the largest; segments III and IV with three (1+2) and four (2+2 +1) sense cones respectively. Maxillary stylets scarcely reaching postocular setae, narrowly V-shaped; maxillary bridge rather distinct, about 0.4 times as wide as head. Pronotum ( Fig. 159 View FIGURES 159–168 ) about 0.6 times as long as head, 0.61 times in holotype , about 1.6 times as wide as long, 1.61 times in holotype; almost smooth; five pairs of prothoracic setae expanded; am setae almost as long as aa, or longer; epim a little longer than pa and postocular setae. Prospinasternum ( Fig. 162 View FIGURES 159–168 ) irregularly shaped, about 20µm wide; mesopresternum complete, boat-shaped. Mesonotal lateral setae developed, expanded, 20–25µm long. Metanotum ( Fig. 163 View FIGURES 159–168 ) sculptured with longitudinal reticulation; median pair of setae pointed, 20–25µm, distance between both median setae much wider than distance between those setae and anterior margin of metanotum, 48µm apart from each other, 27µm apart from anterior margin in holotype . Fore tarsus with a small tooth ( Fig. 165 View FIGURES 159–168 ). Fore wing with 3–7 duplicated cilia, 4 in holotype ; three sub-basal setae well developed, expanded, S3 the longest. Pelta ( Fig. 164 View FIGURES 159–168 ) trapezoid with irregular lateral margins, 1.35 times as wide as long in holotype . Tergites III – VIII S2 setae: III – VI expanded, VII – VIII pointed. Tergite IX S1 setae bluntly pointed, but often nearly pointed, shorter than tube, S2 sharply pointed, longer than S1, almost as long as tube, or a little longer than tube; intermediate setae about half of Sl. Tube shorter than 0.6 times as long as head, 0.54 times in holotype , about 2.0 times as long as wide; terminal setae about 1.8–1.9 times as long as tube, 1.91 times in holotype.

Measurements (holotype female in µm). Body length 1460 (distended). Head length 160, from anterior margin of eyes 143, width across eyes 120, maximum width across cheeks 124, minimum width across base 104; eyes length 55; diameter of posterior ocelli 11–13; postocular setae 38–40. Maxillary bridge width 48. Antenna total length 280, segments III–VIII length (width) as follows: 34 (23), 37 (25), 33 (22), 35 (20), 35 (18), 27 (9). Pronotum length 98, width 158. Setae on prothorax: am 29–30, aa?25, ml 35, pa 37–38, epim 42–43. Fore wing length 560. Sub-basal wing setae: S1 32, S2 35, S3 40 –42. Pelta length 52, width 70. Tergite IX setae: S1 77–80, S2 84–85. Tube length 87, maximum width 43; terminal setae 163–166.

Male (macroptera). Distended body length: 1.1–1.3mm. Very similar to macropterous female in color and structure, but showing allometric growth. Large male: prothorax and froe legs enlarged ( Fig. 166 View FIGURES 159–168 ), fore tarsal tooth stout; terminal tube setae longer than 2.0 times as long as tube. Tip of pseudovirga slender ( Fig. 167 View FIGURES 159–168 ), less than 5µm wide.

Measurements (paratype small–large males in µm). Body length 1100–1300 (distended). Head length 123– 152, from anterior margin of eyes 115–137, width across eyes 108–121, maximum width across cheeks 111–123, minimum width across base 92–102; eyes length 42–52; diameter of posterior ocelli 8–13; postocular setae 35–38. Maxillary bridge width 53–55. Antenna total length 250–275, segments III–VIII length as follows: 30–33, 34–38, 30–33, 32–36, 30–35, 25–26. Pronotum length 78–108, width 135–154. Setae on prothorax: am 20–28, aa 25–25, ml 28–35, pa 32–38, epim 33–38. Fore wing length 470–530. Sub-basal wing setae: S1 28 –30, S2 31 –33, S3 33 –37. Pelta length 42–50, width 55–69. Tergite IX setae: S1 50 –55, S2 20 –20. Tube length 61–

Type material. Holotype: macropterous female, the Philippines, Mindanao, North Cotabato, Ilomavis , on dead leaves, 26.vii.1979, SO . Paratypes: the Philippines, Mindanao , 4 females and 8 males, collected together with holotype; locality and collector as in holotype , 1 female, on grass, 26.vii.1979, 17 females and 8 males, on dead fern, 27.vii.1979, 1 male, on grass, 27.vii.1979, 8 females and 10 males, on dead leaves, 28.vii.1979.

Doubtful specimens. Peninsular Malaysia, 1 female, Tanah Rata , on dead leaves, 24.vii.1976 , SO; Tapah , on dead leaves , 5 females, 28.vii.1976, 3 females and 3 males, 30.vii.1976, SO; 5 females, NE 13km from Tapah , on dead leaves, 27.vii.1976 , SO; 1 male, about 20km N from Kuala Lumpur, Templer Park, on dead leaves, 13.viii.1990 , TN & SO. Vietnam, 1 female and 1 male, Lam Dong Prov., Da Lat, Ward 5, Van Thanh, 23.xii.2001 , SO; 1 female, Lam Dong Prov., Finom Ward , Don Duong, on bamboo, 25.xii.2001 , SO; Lam Dong Prov., Bao Loc, Dam Bri , 1 female, habitat uncertain, 1 female, on bamboo, 27.xii.2001, 5 females and 1 male, on grass, 22.viii. 2007, SO.

Comments. This species was described from Mindanao, the Philippines, based on a good series of females and males taken mainly from dead plants, and seems likely to be a fungus-feeder. It may be included in the pictipes - group. It is apparently very similar to N. apoae sp. nov. described above, but can be distinguished by the following features (in parentheses are the features of apoae ): antennal segment III shorter than segment IV (III almost as long as IV); postero-lateral setae S2 on abdominal tergites V and VI expanded (S2 on V pointed or bluntly pointed, at least not expanded, those on VI pointed); tube shorter than 0.6 times as long as head (tube about 0.6 times as long as head, or a little longer); terminal tube setae longer than 1.8 times as long as tube in female, longer than 2.0 times in male (1.2–1.3 times as long as head in female, about 1.5 times in male); male pseudovirga narrower, less than 5µm wide (wider and rounded, 12–13µm wide). Some females and males from Peninsular Malaysia and Vietnam listed under the doubtful specimens may represent this species but have some small differences.