Ethirothrips kasetsarti, 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 : 29-31

Ethirothrips kasetsarti sp. n.

( Figs 62–68 , 222 )

Female (macroptera). Distended body length: 2.1–2.8mm. Colour dark brown. Antennal segment II yellowish distally; segments III and IV yellow to brownish yellow, IV usually a scarcely darker than III; segment V variable in colour, usually brown with base a little paler, but sometimes with basal 2/3 yellowish; segments VI–VIII dark brown. Fore tibiae brownish yellow, distinctly paler than femora, mid and hind tibiae with bases and apices yellowish, fore tarsi brownish yellow. Fore wings almost clear, without dark streak. Prominent setae yellowish. Head ( Fig. 62 ) longer than broad, about 1.3 times as long as broad, 1.31 times in holotype, broadest across cheeks just behind eyes; dorsal surface sculptured marginally with weak striae or reticulation. Cheeks convex, constricted sub-basally; each with a few minute setae, postocular cheek setae minute. Postocular setae situated behind eyes, much longer than eyes, about 1/3 of head length in holotype, blunt or nearly pointed; postocellar setae minute, 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 18–22μm in diameter, 70μm apart from each other in holotype. Antennae ( Fig. 63 ) about 1.6–1.7 times as long as head; segment VIII shorter than segment VII, weakly constricted basally; segment III 2.34 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 1/3 of head width apart from each other. Pronotum ( Fig. 62 ) much shorter than half the length of head, about 0.4 times as long as head in holotype; dorsal surface almost smooth, sculptured with transverse reticulation laterally and posteriorly. Prominent setae blunt, am and aa subequal in length, about 40μm; epim the longest. Mesopresternum ( Fig. 64 ) narrowly boat-shaped. Metanotum ( Fig. 65 ) without CPS. Fore femora moderately enlarged, without long setae; fore tarsus ( Fig. 67 ) with a short widely-based tooth. Fore wings each usually with less than 15 duplicated cilia, 12–14 in holotype; sub-basal setae S1 and S2 blunt, S3 blunt or nearly pointed. Pelta ( Fig. 65 ) relatively angulate anteriorly, with lateral wings, but lateral wings small, often indistinct from median lobe. Abdominal tergite II distinctly eroded laterally at anterior 3/4. Posteromarginal setae on abdominal tergite IX sharply pointed, S2 longer than tube, S1 shorter than S2, almost as long as tube or a little longer. Tube ( Fig. 66 ) shorter than head, about 0.9 times as long as head, about 2.4 times as long as broad in holotype, sides not smooth, usually with a few bumps, weakly convex, not strongly constricted at apex.

Measurements (holotype female in μm). Body length 2570 (distended). Head length 310, from anterior margin of eyes 295, width across cheeks 235, minimum width across near base 185; eyes length 75, width 63; postocular setae 100–110. Antenna total length 513, segments I–VIII length (width) as follows: 60 (42), 58 (36), 82 (35), 76 (37), 72 (35), 62 (30), 49 (25), 38 (15). Pronotum length 125, width 290. Setae on prothorax: am 40, aa 35–40, ml 40–50, pa 88–90, epim about 100. Fore wing length 990. Sub-basal wing setae: S1 40, S2 58 –65, S3 95–100. Setae on tergite IX: S1 260–275, S2 300–320. Tube length 275, maximum width 115; terminal setae 180–190.

Male (macroptera). Distended body length: 1.9–2.4mm. Colour and structure very similar to female. Head 1.22–1.35 times as long as broad. Prothorax and fore legs stouter in large male, pronotum 0.41–0.55 times as long as head; fore tarsal tooth ( Fig. 68 ) stout. Fore wings with 9–12 duplicated cilia. Tube 2.4–2.5 times as long as broad.

Measurements (paratype small–large males in μm). Body length 1980–2370 (distended). Head length 240–280, from anterior margin of eyes 230–265, width 196–208; eyes length 63–74, width 55–60; postocular setae 83–90. Antenna total length 450–475, segments I–VIII length (width) as follows: 50–55 (35–40), 55–55 (30–32), 70–75 (30–30), 68–74 (30–33), 65–70 (30–31), 56–60 (26–27), 45–48 (23–23), 28–34 (13–15). Pronotum length 100–155, width 245–295. Setae on prothorax: am 27–35, aa 35–35, ml 35–50, pa 60–87, epim 62–90. Fore wing length 790–850. Sub-basal wing setae: S1 30 –35, S2 40 –50, S3 70–95. Setae on tergite IX: S1 220–280, S2 240–280. Tube length 220–250, maximum width 88–105; terminal setae 170–200.

Type series. Holotype: macropterous female, Thailand, Bangkok, Bangkhen, Campus of Kasetsart University , NBCRC, on dead branches of Casuarina equisetifolia , 11.i.1988, SO . Paratypes: Thailand, 13 females and 14 males, collected together with holotype, data similar to holotype, 9 females and 20 males, 25.xii.1987, 7 females and 1 male, 13.i.1988, 5 females and 5 males, 14.i.1988, 7 females and 5 males, 18.i.1988, 1 female, 22.i.1988; same locality as holotype, 4 females and 1 male, on dead branches, 26.xii.1987; same locality as holotype, 16 females and 8 males, on dead branches of Bougainvillea ? glabra, 28.xii.1987, all collected by SO.

Non-paratypic specimens: Thailand, Phuket Is., 1 male, nr. Rawai Beach, on dead Palmae fronds, 6.viii.1991, 1 female, Rang Hill, on dead leaves and branches, 14.ix.1992, SO .

Remarks. E. kasetsarti is somewhat similar to E. duricaudus sp. n. in having the head short, short postocellar setae, moderately elongate anteromarginal pronotal setae, fewer duplicated cilia on the fore wings, and the roughsided short tube. Although duricaudus has antennal segments III and IV dark, brownish fore wings, and anteriorly angulated pelta ( Fig. 59 ), kasetsarti has yellowish antennal segments III and IV ( Fig. 63 ), clear fore wings, and the pelta a different shape ( Fig. 65 ). The peltae of these two species are almost trilobed ( Figs 59 & 65 ), but the lateral wings are small and often indistinct from the median lobe. It seems somewhat intermediate between trilobed pelta and broadly triangular pelta. One female and one male listed in the non-paratypic specimens from Phuket Island could not be distinguished from this species.

Figures

FIGURES 62–68. Ethirothrips kasetsarti sp. n. (62) Head & prothorax, female; (63) antenna, female; (64) mesopresternum, female; (65) metanotum & pelta, female; (66) tube, female; (67) fore tarsus, female; (68) fore tarsus, male.

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.

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.