Ethirothrips duricaudus, Okajima & Masumoto, 2023

Okajima, Shûji & Masumoto, Masami, 2023, Six genera of the subtribe Macrothripina from Southeast Asia to Taiwan (Thysanoptera, Phlaeothripidae, Idolothripinae), Zootaxa 5291 (1), pp. 1-74 : 27

Ethirothrips duricaudus sp. n.

( Figs 56–61 , 221 )

Female (macroptera). Distended body length: 2.7–3.2mm. Colour dark brown. Antennal segment III yellowish basally. Fore tibiae brown, slightly paler than femora, fore tarsi yellowish brown, mid and hind tarsi brown. Fore wings shaded with brown. Prominent setae yellowish to brownish. Head ( Fig. 56 ) a little longer than broad, 1.26 times as long as broad in holotype, broadest across cheeks just behind eyes; dorsal surface almost smooth, sculptured marginally with weak striae or reticulation. Cheeks convex, but narrowed to base; each with a few minute setae. Postocular setae situated behind eyes, much longer than eyes, 0.41–0.42 times as long as head in holotype, nearly pointed; postocellar setae variable in length, but mostly shorter than diameter of a posterior ocellus, situated behind posterior ocelli. Eyes directed forward, about 1/4 as long as head; posterior ocelli close to eyes, about 20μm in diameter, 63μm apart from each other in holotype. Antennae ( Fig. 57 ) about 1.7 times as long as head; segment VIII shorter than segment VII, scarcely constricted basally; segment III about 2.4 times as long as broad in holotype, longer than segment IV; sense-cones short, segment IV with four sense-cones. Maxillary stylets deeply retracted, reaching postocular setae, V-shaped, about 1/2 of head width apart from each other. Pronotum ( Fig. 56 ) shorter than half the length of head, 0.48 times as long as head in holotype; dorsal surface almost smooth, very weakly sculptured with transverse reticulation posteriorly. Prominent setae nearly pointed, am longer than 30μm, almost as long as aa, pa the longest, about 0.8 times as long as pronotum. Mesopresternum ( Fig. 58 ) widely boat-shaped. Metanotum ( Fig. 59 ) without CPS. Fore femora moderately enlarged, without long setae; fore tarsus ( Fig. 60 ) with a wide-based tooth. Fore wings each usually with less than 15 duplicated cilia, with 11–11 cilia in holotype; sub-basal setae S1 and S2 nearly pointed, S3 sharply pointed. Pelta ( Fig. 59 ) with lateral wings which are widely fused to median lobe. Abdominal tergite II strongly eroded laterally at anterior 2/3. Posteromarginal setae on abdominal tergite IX sharply pointed, almost as long as tube or a little longer, S1 and S2 subequal in length. Tube ( Fig. 61 ) a little shorter than head, about 2.7 times as long as broad, sides not smooth, usually with a few bumps, or finely sinuate, weakly constricted at apex.

Measurements (holotype female in μm). Body length about 2850 (distended). Head length 305, from anterior margin of eyes 290, width 243; eyes length 80, width 67; postocular setae 125–127. Antenna total length 515, segments I–VIII length (width) as follows: 63 (40), 70 (35), 90 (38), 83 (41), 77 (35), 67 (33), 50 (27), 38 (16). Pronotum length 145, width 295. Setae on prothorax: am 35–38, aa 35–40, ml 55–64, pa 115–120, epim 103–110, cox 36–38. Fore wing length 1225. Sub-basal wing setae: S1 25 –35, S2 58 –70, S3 110–115. Setae on tergite IX: S1 300, S2 300. Tube length 295, maximum width 110; terminal setae 180.

Male (macroptera). Distended body length: 2.0– 2.7mm. Colour and structure very similar to female. Prothorax and fore legs stouter, pronotum 0.56 times as long as head in large male. Tube about 2.5 times as long as broad.

Measurements (paratype large male in μm). Body length about 2655 (distended). Head length 284, from anterior margin of eyes 270, width 226; eyes length 76, width 64; postocular setae 120. Antenna total length 510, segments I–VIII length (width) as follows: 65 (43), 60 (35), 87 (33), 75(35), 70 (33), 63 (30), 50 (25), 40 (15). Pronotum length 160, width 325. Setae on prothorax: am 35, aa 50, ml 65–67, pa 125, epim 110–120, cox 40. Fore wing length 1175. Sub-basal wing setae: S1 30 –35, S2 65, S3 95–97. Setae on tergite IX: S1 270, S2 275. Tube length 270, maximum width 108; terminal setae 160.

Type series. Holotype: macropterous female, Peninsular Malaysia, Cameron Highlands, nr. Brinchang, on dead leaves and branches, 27.viii.1990, TN & SO. Paratypes: Peninsular Malaysia, Cameron Highlands, 4 females, collected together with holotype; 2 females and 4 males, data similar to holotype, 30.viii.1990; Tanah Rata, 2 females, on dead branches, 24.vii.1976, SO, 1 female, 5.iii.1976, W. Suzuki, 1female, 30.viii.1990, 3 females, on dead leaves and branches, 18.ix.1990, TN & SO; foot of Gnung Jasar, 1 female, on dead leaves and branches, 19.ix.1990, TN & SO .

Non-paratypic specimens: Indonesia, 2 females, Sumatra, nr. Toba lake , 4.v.1990, K. Matsumoto .

Remarks. E. duricaudus is very similar to E. dalatae sp. n. described above from S. Vietnam in general appearance. However, it can be distinguished from dalatae by the following character states: Antennal segment III dark brown with base yellowish ( Fig. 57 ); fore femora generally dark brown; pronotal aa and am subequal in length; tube shorter than head in female; S1 setae on abdominal tergite IX almost as long as tube or a little longer. Moreover, the lateral margins of abdominal tergite II of duricaudus are particularly eroded in anterior two-thirds. Two females collected from Sumatra, Indonesia, listed in the non-paratypic specimens could not be distinguished from this species, but have some small differences.

Figures

FIGURES 56–61. Ethirothrips duricaudus sp. n., female. (56) Head & prothorax; (57) antennal segments II–VIII; (58) mesopresternum; (59) metanotum & pelta; (60) fore tarsus; (61) tube.

FIGURES 211–222. Macrothripina genera and species. Aesthesiothrips species, female 211–213: (211) A. breviconus sp. n.; (212) A. elongatus sp. n.; (213) A. jatrophae. Celidothrips species, female 214–215: (214) C. adiaphorus; (215) C. floresi sp. n. Ethirothrips species 216–222: (216) E. brevis, female; (217) E. colossus sp. n., male; (218) E. conopygus sp. n., male; (219) E. conopygus sp. n., female; (220) E. dalatae sp. n., female; (221) E. duricaudus sp. n., female; (222) E. kasetsarti sp. n., female.