Asianthrips bamboosielloides, Okajima & Masumoto, 2022

Okajima, Shuji & Masumoto, Masami, 2022, The genus Asianthrips an Oriental fungus-feeding phlaeothripine (Thysanoptera, Phlaeothripidae), Zootaxa 5124 (2), pp. 101-138 : 109-110

Asianthrips bamboosielloides sp. n.

( Figs 2 , 36–40)

Female macroptera. Body bicoloured yellow and brown ( Fig. 2 ). Head, thorax and tube brown; tube darker at basal 1/2, with pale base.Abdominal segments I to IX yellow; segments III and IV each with an indistinct median marking just behind antecostal suture. Antennal segments I brown; segment II brown, yellowish distally; segment III yellow; segment IV pale brown, yellowish at basal 1/3; segments V to VIII brown, segment V slightly paler at basal 1/4. Fore and mid coxae brown; fore and mid femora brown, yellowish at apex; remaining of legs including whole of hind legs yellow. Fore wing almost colourless, but brownish at base. Prominent body setae almost colourless. Head (Fig. 36) almost as long as wide, 0.98 times as long as wide; dorsal surface sculptured with transverse reticulation. Cheeks rounded, narrowed to base. Eyes well developed, 0.45–0.46 times as long as head. Postocular setae shorter than eyes. Postocellar setae shorter than a diameter of posterior ocellus. Antennal segments VII and VIII widely fused, segment VIII not constricted at base, almost cone-shaped (Fig. 37); segment III possibly with three sense cones (most of them are missing in the unique holotype female). Maxillary stylets V-shaped and very short, reaching only to basal collar of head. Maxillary bridge invisible. Mouth cone short. Pronotum (Fig. 36) 0.65 times as long as head, 1.86 times as wide as long; epim longer than pa, the longest; pa almost as long as 1/2 of median pronotal length. Prospinasternum largely developed. Basantra distinct. Mesopresternum and mesoeusternum widely fused medially (Fig. 38), with short sutures between them at both sides. Fore wing without duplicated cilia; three subbasal wing setae not so long (Fig. 40), these character states of fore wings are unique in the genus. Fore tarsal tooth absent. Pelta hat-shaped. Tergites not small, tergites II to VII wider than pronotum. S1 and S2 setae on tergite IX subequal in length, weakly expanded at apex. Tube 0.65 times as long as head. Anal setae almost as long as tube .

Measurements. Female holotype (mac.) in microns. Distended body length 1630. Head length 157, width across cheeks 160. Compound eye dorsal length 71–72. Pronotum length 102, width 190. Fore wing length about 710. Tube length 102, width across base 51. Antenna length about 340 segments III–VIII length (width) as follows: 51 (28), 50 (27), 48 (25), 43 (22), 38 (20), 31 (13). Postocular setae 50–52. Pronotal aa 32, am 30–32, ml 51–53, pa about 50, epim 57–58. S1 setae on tergite IX?65, S2 setae on tergite IX 62–65. Anal setae 100–105.

Type series. Holotype female (mac.): Vietnam, Lam Dong Prov., Bao Loc, Dam Bri , on bamboo, 28.xii.2001 (SO).

Remarks. A. bamboosielloides is unique in having the fore wings without duplicated cilia. Moreover, it has very short and V-shaped maxillary stylets (Fig. 36), which are reaching only to the basal collar of the head, like those of Bamboosiella species. This feature is shared with A. malayanus , newly described below from Peninsular Malaysia, but that species can easily be distinguished by the unicolourous brown body and the presence of the duplicated cilia on the fore wings.

Figures

FIGURES 1–10. Asianthrips species. (1) A. balianus, female (mac). (2) A. bamboosielloides, female (mac). A. bicolor, 3–4; (3) Female (mac); (4) Female (mic). (5) A. borneoensis, female (mac). A. dasycornis, 6–7; (6) Female (mac); (7) Male (mic). A. denticornis, 8–9; (8) Male (mac); (9) Female (mic). (10) A. longior, female (mac).