Androthrips bambusicola, Okajima & Masumoto, 2025

Okajima, Shûji & Masumoto, Masami, 2025, Some Poaceae-inhabiting Phlaeothripinae (Thysanoptera, Phlaeothripidae) in East Asia, with descriptions of six new genera and 18 new species, Zootaxa 5726 (1), pp. 1-68 : 9-12

Androthrips bambusicola sp. nov.

( Figs 6, 11–19 )

Female (macroptera). Distended body length: 1.5–2.0mm. Body brown to dark brown ( Fig. 6 ), tube the darkest. Fore femora largely yellow, shaded with brown postero-externally, but sometimes more brown or largely yellow, mid and hind femora brown; tibiae and tarsi yellow. Antennal segments I– II and VII – VIII pale brown; segments III – VI largely yellow, segment VI scarcely shaded distally. Fore wings and major body setae pale. Head longer than wide ( Fig. 11 ), 1.35–1.40 times as long as wide, 1.37 times in holotype; dorsal surface almost smooth, sculptured laterally, but with a few transverse fine wrinkles or striae at middle. Cheeks weakly rounded, serrated. Postocular setae shorter than eyes, weakly expanded, 110µm apart from each other, 17–18µm apart from eyes in holotype. Eyes largely developed, 0.36–0.38 times as long as head, ommatidia scarcely spaced. Ocelli normal, posterior pair in contact with eyes, 30µm apart from each other in holotype. Antennae ( Fig. 19 ) about 1.7 times as long as head; segment VIII very weakly constricted at base, about 0.9 times as long as segment VII; segments III a little longer than IV; segments III and IV each with (1+2) and (2+2 +1) sense cones respectively, these sense cones are pale and slender, often very difficult to observe. Maxillary stylets rather short and wider apart, not reaching postocular setae, almost V-shaped; maxillary bridge wide, slightly wider than half of head width, placed just before basal collar of head, 7–10µm apart from basal collar of head at middle in holotype. Pronotum ( Fig. 11 ) 0.69 times as long as head, 1.46 times as wide as long in holotype, almost smooth; only three pairs of major prothoracic setae weakly expanded; ml reduced to small setae, but often somewhat longer; pa and epim well developed, pa almost as long as postocular setae, or longer, epim longer than pa. Prosternal basantra and ferna well-developed ( Fig. 13 ). Prospinasternum well-developed, widely fan-shaped, 35µm wide in holotype. Mesopresternum transverse, nearly complete. Mesonotal lateral setae not reduced. Metanotum sculptured with polygonal reticulation, with no small setae before median pair of setae; median pair of setae short and acute, 25µm apart from each other, 52–55µm apart from anterior margin of metanotum in holotype. Fore femora typical of the genus ( Figs 15 & 16 ), with an inner sub-basal tubercle and an irregular row of several minute tubercles; fore tibial inner apical scale small ( Fig. 17 ). Fore wing with 2–7 duplicated cilia, with 6 cilia in holotype; sub-basal setae S1 and S2 expanded or weakly expanded, S2 longer than S1, S3 much longer than S2, blunt or very weakly expanded. Pelta ( Fig. 14 ) trapezoid or hat-shaped, usually with indistinct lateral wings, 1.05 times as wide as long in holotype. Tergites I – VIII S1 setae weakly expanded. Tergites III – VIII S2 setae: III – VI weakly expanded or blunt, VII pointed, VIII expanded. Tergite IX S1 setae blunt, shorter than tube, S2 finely pointed, longer than tube; intermediate setae about half of S1. Tube ( Fig. 18 ) about 0.6 times as long as head, 0.62 times in holotype, 2.0–2.2 times as long as wide; terminal setae about 1.5 times as long as tube, or a little longer .

Measurements ( holotype female in µm). Body length 1950 (distended). Head length 210, from anterior margin of eyes 193, width across eyes 152, maximum width across cheeks 153, minimum width across base 127; eyes length 79; diameter of posterior ocelli 16–17; postocular setae 50–55. Maxillary bridge width 81. Antenna total length 355, segments III–VIII length (width) as follows: 52 (28), 49 (31), 45 (26), 42 (22), 35 (18), 32 (11). Pronotum length 145, width 212. Setae on prothorax: aa 32, ml minute, pa 58–60, epim 70–73. Fore wing length 800. Sub-basal wing setae: S1 40 –41, S2 48 –50, S3 78–86. Pelta length 78, width 82. Tergite IX setae: S1 101–107, S2 140–144. Tube length 130, maximum width 60; terminal setae 190–200.

Male (macroptera). Distended body length: 1.4–1.8mm. Very similar to macropterous female in color and structure. Head ( Fig. 12 ) 1.2–1.3 times as long as wide; maxillary bridge wider, 0.55–0.60 times as wide as head; fore wing with 4–6 duplicated cilia; tergite IX S1 setae longer than 0.4 times as long as S2; tube 0.64–0.66 times as long as head; terminal tube setae 1.3–1.4 times as long as tube.

Measurements ( paratype male in µm). Body length 1520 (distended). Head length 167, from anterior margin of eyes 155, width across eyes 136, maximum width across cheeks 135, minimum width across base 110; eyes length 72; diameter of posterior ocelli 12–15; postocular setae about 40. Maxillary bridge width 77. Antenna total length 290, segments III–VIII length as follows: 40, 39, 37, 37, 32, 29. Pronotum length 114, width 172. Setae on prothorax: aa 18, ml less than 10, pa 52–55, epim 52–52. Fore wing length 620. Sub-basal wing setae: S1 36 –38, S2 40 –43, S3 65–67. Pelta length 70, width 74. Tergite IX setae: S1 75–80, S2 35 –38. Tube length 110, maximum width 25; terminal setae 145–150.

Type material. Holotype: macropterous female, Thailand, nr. Chiang Mai, Doi Suthep , on bamboo, 1.ix.1991, TN & SO . Paratypes: Thailand, 15 females and 1 male, collected together with holotype ; 1 male, nr. Chiang Mai, Mae-sa , on bamboo, 3.ix.1991, TN & SO ; 1 female, nr. Chiang Mai, Hong Kai , 4.ix.1991, TN & SO ; 4 females, nr. Chiang Mai, Phrow , on bamboo, 22.viii.1992, TN & SO ; 3 females, nr. Chiang Mai, Ka Jan , on bamboo, 3.ix.1992, TN & SO ; 3 females, Chiang Mai Prov., Mae Sa Nam , on bamboo, 20.iii.1999, P. Jangvitaya ; 14 females and 11 males, Phuket Is., Phuket Hill , on bamboo, 22.viii.1991, TN & SO ; 2 females and 2 males, data very similar to above, but 9.ix.1992; 2 females and 1 male, Phuket Is., nr. Rawai Beach , on bamboo, 15.ix.1992, TN & SO .

Non-paratypic specimens. Thailand, 1 female and 1 male, Bangkok , Bangkhen, Campus of Kasetsart University , NBCRC, on bamboo, 22.viii.1990, TN & SO ; 3 females, nr. Kanchanabri , on bamboo, 30.viii.1991, TN & SO . Vietnam, 8 females and 1 male, Son La Province , Moc Chau , on bamboo, 5.iii.2000, SO ; 1 female and 1 male, Hoa Binh Province, Hoa Binh , on bamboo, 6.iii.2000, SO; 1 female, Hatay Province , Mt. Bavi , on bamboo, 29.vii.2000, SO ; 4 females and 1 male, Bac Can Province , Ba Be National Park , on bamboo, 2.viii.2000; SO . Indonesia, Java, 1 female, Malang, Batu, Pujon , on bamboo, 22.viii.2005, SO ; 1 female, Malang, Sundeng, Sawo Sajar , 24.viii.2005, SO ; 1 female, Banyuwangi, Malan Sari , on bamboo, 27.viii.2005, SO .

Comments. This species is described from Thailand based on a good number of specimens collected from bamboo, and included in the coimbatorensis -group. It is related to A. coimbatorensis that is also taken from bamboo in India, and these two species share the maxillary stylets short and V-shaped even in female and the prothoracic midlateral setae reduced. However, from coimbatorensis , bambusicola can be distinguished by the following features: mid and hind tibiae yellow; antennal segments IV–VI largely yellow; prothoracic anteroangular setae developed, expanded; fore tibial inner sub-apical scale small; tergite IX S2 setae longer than tube. A. huanglianensis from Yunnan, China, is also similar to this species, but it has the pronotal midlateral setae well-developed and the fore femora largely brown. Several females and males listed under the non-paratypic specimens may represent this species, but have some differences in the length of setae, such as prothoracic anteroangular setae, sub-basal wing setae and S1 and S2 setae on the abdominal tergite IX. In particular, three females from ‘nr. Kanchanabri’, Thailand, have the prothoracic notopleural sutures incomplete.

Figures

FIGURES 6–19. Androthrips species, female 6–10: (6) A. bambusicola sp. nov.; (7) A. dambriae sp. nov.; (8) A. fuscipes sp. nov.; (9) A. graminicola sp. nov.; (10) A. javae sp. nov. Androthrips bambusicola sp. nov. 11–19: (11) head and prothorax, female; (12) head, male; (13) prosternum and mesopresternum, female; (14) pelta, female; (15) fore leg, female; (16) fore femur, male; (17) fore tibia and tarsus, female; (18) tube, female; (19) antenna, female.