Namothrips bambusae, 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 : 25-27

Namothrips bambusae sp. nov.

( Figs 83–93 )

Female (macroptera). Distended body length: about 1.5mm. Body sharply bicolored brown and yellow ( Fig. 83 ). Head and pterothorax brown, but head is yellow on ventral surface ( Fig. 85 ); abdominal segment IX and tube pale brown, somewhat paler than head; abdominal segments I– VIII yellow, but segments I and VI – VIII very weakly shaded with brown. Legs yellow, but mid coxae are brown. Antennal segments I– II and VII – VIII brown, segments III – VI yellow. Fore wings weakly shaded with brown. Prominent body setae pale. Head 1.9 times as long as wide ( Fig. 84 ), distinctly elevated dorsally ( Fig. 85 ), widest across cheeks just behind eyes; dorsal surface covered with fine wrinkles and sculptured with weak reticulation ( Fig. 86 ). Cheeks almost straight, weakly narrowed towards base, each with a short postocular cheek seta. Postocular setae much shorter than eyes, weakly expanded, about 40µm apart from each other in holotype . Eyes about one-fourth as long as head. Posterior ocelli 10–12µm in diameter, about 10µm apart from each other in holotype . Antennae ( Fig. 92 ) 1.35 times as long as head in holotype ; segment VI a little longer than segment III. Pronotum ( Fig. 84 ) 0.42 times as long as head and 1.55 times as wide as long in holotype ; sculptured with reticulation marginally, semicircular lines sub-medially. Four pairs of pronotal setae and epimeral setae well developed, expanded at apices. Mesonotum distinctly sculptured; mesopresternum somewhat wider, not narrowed or eroded medially. Metanotum sculptured medially with longitudinal reticulation or lines ( Fig. 87 ), with fine dots among lines, smooth laterally; median pair of setae short, 25–27µm apart from anterior margin, 22µm apart from each other in holotype . Three sub-basal setae expanded, S2 a little shorter than S1. Pelta weak ( Fig. 89 ), narrowly hat-shaped, with no campaniform sensilla. Wing-retaining setae well developed and sigmoid ( Fig. 90 ), but those on tergite II are short and rather straight. Tergite IX S1 and S2 setae pointed. Tube ( Fig. 93 ) 0.43 times as long as head, about 2.0 times as long as wide in holotype .

Measurements ( holotype female in μm). Body length about 1500 (distended). Head length 208, from anterior margin of eyes 195, width across cheeks 110, across eyes 108; eyes length 50, width 38–40; postocular setae 35–38. Antenna total length 280, segments I–VIII length (width) as follows: 27 (25), 38 (24), 37 (21), 35 (22), 38 (20), 40 (20), 32 (18), 24 (10). Pronotum length 87, width 135. Setae on prothorax: am 40–42, aa 45–48, ml 37–42, pa 50, epim 53–55, cox 20. Fore wing length 580. Sub-basal wing setae: S1 45, S2 38 –43, S3 50 –52. Tergite IX setae: S1 40 –42, S2 60 –70. Tube length 90, maximum width 46; terminal setae about 90.

Male (macroptera). Distended body length: 1.1–1.2mm. Color and structure very similar to female. Pore plate on abdominal sternite VIII, weak, separated both sides ( Fig. 91 ); tergite IX S2 setae shorter, almost as long as S1 or shorter. Tube shorter than 0.4 times as long as head.

Measurements ( paratype male in μm). Body length about 1120 (distended). Head length 183, from anterior margin of eyes 165, width 95; eyes length 40, width 35; postocular setae about 20. Antenna total length 260, segments I–VIII length (width) as follows: 27 (22), 33 (21), 32 (17), 30 (19), 33 (20), 37 (18), 30 (17), 20 (10). Pronotum length 65, width 100. Setae on prothorax: am 20, aa 25, ml 25, pa 30, epim 40, cox 15. Fore wing length 490. Sub-basal wing setae: S1 26, S2 23, S3 30. Tergite IX setae: S1 about 30, S2 about 30. Tube length 70, maximum width 35; terminal setae 70.

Type material. Holotype: macropterous female, Vietnam, Lam Dong Province, Bao Loc, Dam Bri , on bamboo, 27.xii.2001, S. Okajima . Paratypes: Vietnam, 5 females and 1 male, collected with holotype ; 6 females and 2 males, data very similar to holotype, but 28.xii.2001.

Comments. This species is described from Vietnam based on 12 females and 3 males taken from bamboo. It was collected together with Vietothrips bicolor gen. et sp. nov. described below, but their feeding habit is unknown .

Figures

FIGURES 83–93. Namothrips bambusae gen. et sp. nov. (83) whole body; (84) head and prothorax, female; (85) head and prothorax, lateral view, female; (86) surface of head, female; (87) metanotum, female; (88) fore wing, female; (89) pelta, female; (90) tergite IV, female; (91) sternite VIII, male; (92) antennal segments III–VIII, female; (93) tube, female.