Leptandrothrips indosinae, Okajima & Masumoto, 2025

Leptandrothrips indosinae sp. nov.

( Figs 8 View FIGURES 6–17 , 25–32 View FIGURES 25–32 )

Female (macroptera). Distended body length: 1.5–1.7mm. Body brown. Femora pale brown ( Fig. 8 View FIGURES 6–17 ), with apices yellowish, but often paler; tibiae and tarsi yellow. Antennal segments I and IV – VIII brown; segments II and III yellowish brown, segment III with basal half yellowish, often somewhat paler. Fore wing weakly shaded with brown. Major body setae pale. Head ( Fig. 25 View FIGURES 25–32 ) much longer than wide, about 1.4 times as long as wide, 1.37 times in holotype, widest across cheeks at middle, dorsal surface smooth. Cheeks weakly rounded, weakly serrate. Postocular setae shorter than eyes, expanded, 106µm apart from each other, 15–16µm apart from eyes in holotype. Eyes about 0.3 times as long as head, 0.31 times in holotype. Posterior ocelli in contact with eyes, 35µm apart from each other in holotype. Antennae ( Fig. 32 View FIGURES 25–32 ) about 1.7 times as long as head; segment III widely truncated at apex, about 1.2 times as long as wide, shorter than segment VII; segments III and IV with two (1+1) and three (1+2) sense-cones respectively. Maxillary stylets reaching postocular setae, relatively wider apart, their distance about one-third of head width apart, in holotype 44µm apart from each other at the level of maxillary bridge; maxillary bridge rather distinct. Pronotum ( Fig. 25 View FIGURES 25–32 ) about 0.6 times as long as head, about 1.5 times as wide as long, almost smooth; five pairs of major setae expanded; aa and ml subequal in length, epim much longer than pa, the longest, longer than postoculars. Mesopresternum ( Fig. 27 View FIGURES 25–32 ) transverse, not divided; prospinasternum well developed, inverted triangle, about 40µm wide in holotype. Metanotum very weakly sculptured with polygonal reticulation, but invisible even using phase contrast illumination; median pair of setae weak, short and acute, about 25µm in length, 48µm apart from each other, 29–30µm apart from anterior margin. Fore tarsus ( Fig. 29 View FIGURES 25–32 ) often with a very weak apical tooth. Fore wing with 5 duplicated cilia; three sub-basal setae expanded, S3 the longest. Pelta ( Fig. 28 View FIGURES 25–32 ) triangle, sculptured weakly, 1.2–1.3 times as wide as long. Tergites III – VIII S2 setae: III – VI expanded, VII and VIII pointed. Tergite IX S2 setae longer than S1. Tube ( Fig. 30 View FIGURES 25–32 ) about 0.5 times as long as head, 0.52 times in holotype, about 1.8 times as long as wide. Terminal setae about 1.8 times as long as tube .

Measurements (holotype macropterous female in µm). Body length about 1700 (distended). Head length 175, from anterior margin of eyes 160, width across eyes 123, maximum width across cheeks 128, minimum width across base 106; eyes length 55; diameter of posterior ocelli 8–12; postocular setae about 40. Maxillary bridge width 40. Antenna total length 300, segments III–VIII length (width) as follows: 33 (27), 39 (27), 40 (22), 37 (20), 37 (19), 22 (15). Pronotum length 104, width 158. Setae on prothorax: am 25–27, aa?25, ml?, pa 35–36, epim 50. Fore wing length 590. Sub-basal wing setae: S1 30 –32, S2 33 –34, S3 41 –42. Pelta length 62, width 77. Tergite IX setae: S1 108, S2 150–160. Tube length 91, maximum width 51; terminal setae 165.

Female (microptera). Distended body length: about 1.5–1.7mm. Very similar to macropterous female in color and structure. Eyes somewhat smaller; postocular setae almost as long as eyes; fore wings usually longer than metanotum, with well-developed sub-basal setae; abdominal tergites II–VII each with two pairs of short and rather straight wing retaining setae.

Measurements (paratype micropterous female in µm). Body length about 1700 (distended). Head length 168, from anterior margin of eyes 150, width across eyes 117, maximum width across cheeks 125, minimum width across base 107; eyes length 45; diameter of posterior ocelli 10–12; postocular setae 45–47. Maxillary bridge width 43. Antenna total length 300, segments III–VIII length as follows: 37, 39, 40, 37, 37, 22. Pronotum length 108, width 160. Setae on prothorax: am 30–31, aa 29–31, ml 33–35, pa 40–42, epim 53–54. Fore wing length 197. Sub-basal wing setae: S1 32 –34, S2 38 –39, S3 45 –49. Pelta length 63, width 77. Tergite IX setae: S1 117–118, S2 160. Tube length 94, maximum width 52; terminal setae?.

Male (macroptera). Distended body length: about 1.3–1.5mm. Very similar to macropterous female in color and structure. Head a little broader, about 1.3 times as long as wide; maxillary stylets wider apart, about 0.4 times as wide as head; fore wing with 3–4 duplicated cilia; terminal tube setae longer, usually longer than 2.0 times as long as tube.

Measurements (paratype macropterous male in µm). Body length 1460 (distended). Head length 156, from anterior margin of eyes 142, width across eyes 117, maximum width across cheeks 120, minimum width across base 95; eyes length 50; diameter of posterior ocelli 8–11; postocular setae 41–42. Maxillary bridge width 47. Antenna total length 280, segments III–VIII length as follows: 32, 38, 39, 34, 35, 21. Pronotum length 101, width 135. Setae on prothorax: am 22–23, aa?25, ml 30, pa 38–40, epim 42–48. Fore wing length 550. Sub-basal wing setae: S1 26 –29, S2 32 –33, S3 33. Pelta length 60, width 65. Tergite IX setae: S1 110–113, S2 25 –27. Tube length 75, maximum width 48; terminal setae 165.

Male (microptera). Distended body length: about 1.2–1.5mm. Very similar to macropterous female in color, and to micropterous female in structure.

Measurements (paratype micropterous male in µm). Body length about 1300 (distended). Head length 142, from anterior margin of eyes 127, width across eyes 103, maximum width across cheeks 111, minimum width across base 93; eyes length 40; diameter of posterior ocelli 8–10; postocular setae 30–32. Maxillary bridge width 45. Antenna total length 265, segments III–VIII length as follows: 30, 35, 35, 32, 31, 22. Pronotum length 90, width 138. Setae on prothorax: am 26, aa 27, ml 30, pa 31–33, epim 40–41. Fore wing length 142. Sub-basal wing setae: S1 28, S2 27, S3 35 –36. Pelta length 52, width 65. Tergite IX setae: S1 85–95, S2 23. Tube length 70, maximum width 45; terminal setae 140.

Type material. Holotype: macropterous female, Thailand, nr. Chiang Rai, on dead leaves and branches, 5.ix.1992, TN & SO . Paratypes: Thailand, 5 females (mic.) and 7 males (mic.), collected together with holotype; 2 females (mac.), nr. Chiang Rai, Pha Yao, on dead leaves and branches, 5.ix.1992, SO; 1 male (mac.), nr. Chiang Mai, Phrow, on dead leaves and branches, 22.viii.1992, TN & SO; 3 females (mic.), nr. Chiang Mai, Doi Inthanon , on dead leaves and branches, 29.viii.1992, TN & SO; 1 male (mac.), nr. Chiang Mai, Lam Pang , on dead leaves and branches, 28.viii.1992, TN & SO; 1 female (mic.), nr. Chiang Mai, Ka Jan , on dead leaves and branches, 3.ix.1992, SO; 2 males (mac.), Chiang Dao , on dead leaves, 23.viii.1992, TN; 1 male (mic.), Saraburi, on dead leaves and branches, TN & SO; 3 females (mic.), 4 males (mac.) and 3 melas (mic.), Bangkok, Bangkhen , Campus of Kasetsart University , NBCRC, on dead branches, 26.xii.1987, SO; 1 male (mac.), data very similar to above, but on Ficus retusa aerial roots, 14.i.1989, SO; 1 male (mac.) . Thailand, Phuket, nr. Tone Sai Waterfall , on dead leaves and branches, 14.ix.1992, TN & SO; 3 females (mic.) and 4 males (mic.), Rang Hill, on dead leaves and branches, 14.ix.1992, SO .

Non-paratypic specimens. Peninsular Malaysia, 1 female (mic.), NE 13km from Tapah, on dead leaves, 27.vii.1976, SO ; 1 female (mac.), Tapah, on dead leaves and branches, 16.ix.1990, TN & SO. Singapore, Macritchie Res., on dead branches , 1 male (mac.), 7.viii.1990, 2 females (mac.) and 3 males (mac.), 8.viii.1990, TN & SO. Indonesia, Bali , 1 male (mac.), Buleleng, Penyabangan, Desa Buah, 31.viii. 2005, SO. Borneo , 1 female (mac.), Sabah, Jl. Kimanis, 15km from Kimanis, on dead leaves and branches, 9.ix.1990, TN & SO.

Comments. The sense cone formula of this species is peculiar in the genus: antennal segments III and IV with two (1+1) and three (1+2) respectively. The coloration of antennal segments II and III is somewhat variable even in the type series. Antennal segment II is often darker and almost concolorous with segment I, and segment III is often paler and largely yellowish. Several specimens listed under the non-paratypic specimens may represent this species, but have some small differences in the color of antennae and the length of body setae.