Aesthesiothrips elongatus, 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 : 9-11

Aesthesiothrips elongatus sp. n.

( Figs 8–14 , 212 )

Female (macroptera). Distended body length: 4.8–6.1mm. Colour dark brown. Antennal segment II yellowish distally, segment III yellowish with apical 1/2 partly scarcely shaded. Fore tibiae brownish yellow, scarcely darker basally; tarsi yellowish. Fore wings shaded with brown, paler at base, with a brown streak in basal half. Prominent setae yellow to brownish yellow. Head ( Fig. 8 ) elongate, much longer than twice as long as broad, 2.51 times as long as broad in holotype, broadest across cheeks near middle; dorsal surface smooth or finely sculptured with indistinct wrinkles or reticulation posteriorly, sculptured with transverse wrinkles anteriorly; basal collar strongly protruded posteriorly at middle. Cheeks convex, constricted behind eyes and near base; each with some stout setae, 30–40μm long. Postocular setae short, shorter than 1/2 length of postocellars, situated behind eyes, about 140μm apart from each other in holotype; postocellar setae longer than dorsal length of eyes, situated on a level of posterior margins of posterior ocelli, nearly pointed. Eyes small, prolonged ventrally ( Fig. 9 ), dorsal length 0.17 times as long as head; posterior ocelli close to eyes, 28–35μm in diameter, 77μm apart from each other in holotype. Antennae ( Fig. 10 ) short, 1.3–1.4 times as long as head; segment VIII constricted basally; segment III short, 2.3 times as long as broad, much shorter than segment IV; sense-cones long and slender, setiform, longer than the segment in segment III, a little shorter than the segment in segment IV; segment IV dorsally with two or three small sense-cones in addition to four usual long sense-cones. Pronotum much shorter than 1/4 the length of head, 0.22 times as long as head in holotype; dorsal surface smooth. Prominent setae blunt or nearly pointed, am and aa short, epim elongate, much longer than median length of pronotum. Ferna well developed. Mesopresternum broadly boat-shaped ( Fig. 12 ); prospinasternum narrow, not widened anteriorly, 25μm broad in holotype. Metanotum smooth around median pair of setae ( Fig. 13 ). Fore femur with a long dorso-external seta near middle, 180–190μm long in holotype; fore tibiae unarmed ( Fig. 11 ). Fore wings each with 42–43 duplicated cilia in holotype; sub-basal setae blunt. Pelta ( Fig. 13 ) triangular with recurved lateral wings, typical of the genus. Posteromarginal setae on abdominal tergite IX sharply pointed, shorter than tube, S1 and S2 subequal in length. Tube ( Fig. 14 ) slender, longer than head, about 1.1 times as long as head, about 4.8 times as long as broad, sides almost straight, evenly weakly narrowed to apex, slightly constricted at apex. Terminal setae much shorter than tube.

Measurements (holotype female in μm). Body length about 5800 (distended). Head length 755, from anterior margin of eyes 720, width across eyes 295, across cheeks just behind eyes 270, maximum width across cheeks 300, across near base 260; eyes dorsal length 125, ventral length 170, width 82; postocular setae 55–75; postocellars 160–170; mid-vertex about 70. Antenna total length 1030, segments I–VIII length (width) as follows: 113 (70), 100 (50), 132 (57), 195 (65), 195 (55), 128 (46), 103 (37), 80 (23). Pronotum length 166, width 500. Setae on prothorax: am 45, aa 50, ml 80–85, pa 110–120, epim 280. Fore wing length 2400. Sub-basal wing setae: S1 70–75, S2 110–115, S3 160–170. Setae on tergite IX: S1 660, S2 640–690. Tube length 820, width at base 170, at apex 70; terminal setae 300.

Male (macroptera). Distended body length: 3.7mm. Colour very similar to female. Head widest across eyes, 2.6 times as long as broad. Eyes not prolonged ventrally. Fore wings with 26–27 duplicated cilia. S1 and S2 setae on abdominal tergite IX longer than Tube. Tube about 0.8 times as long as head.

Measurements (paratype male in μm). Body length about 3700 (distended). Head length 570, from anterior margin of eyes 540, width across eyes 220, maximum width across cheeks 210; eyes length 113, width 56; postocular setae 22–28; postocellars 110–115; mid-vertex 45–48. Antenna total length 750, segments I–VIII length (width) as follows: 82 (52), 63 (38), 95 (46), 125 (49), 132 (45), 93 (35), 73 (31), 62 (18). Pronotum length 120, width 340. Setae on prothorax: am less than 20, aa?40, ml?, pa?50, epim 120. Fore wing length 1575. Sub-basal wing setae: S1 40 –45, S2 60 –70, S3 90. Setae on tergite IX: S1 500–510, S2 490–500. Tube length 450, width at base 111; terminal setae 240.

Type series. Holotype: macropterous female, Peninsular Malaysia, Cameron Highlands, nr. Tanah Rata, on dead leaves and branches, 30.viii.1990. TN & SO . Paratypes: Peninsular Malaysia , 8 females, collected together with holotype , 5 females, data similar to holotype, 18.ix.1990, 1 female, same locality as holotype, 8.v.1981, W. Suzuki , 1 female, nr. Brinchang , on dead leaves and branches, 25.viii.1990, TN & SO , 2 females, nr. Tanah Rata, Gnung Tegkolok , on dead leaves and branches, 27.v.1983, T. Senoh ; 2 females and 1 male, Pahang, Endau-Rompin Park, fogging ( Trees : Koompassia excelsa , Shorea leprosula ), 8.vii.2003, H. Kojima .

Non-paratypic specimens. Indonesia, 1 female, Bali Is., Tabanan, Jatiluwin (Peteli Temple), on dead branches, 13.viii.2005, SO. Philippine, 1 female, Mindanao Is., North Cotabato , Ilomavis, on dead twigs, 29.vii.1979, SO .

Remarks. Although A. elongatus is very similar to A. breviconus sp. n. in having longer head proportion, it is presumably more closely related to A. jatrophae in having the short postocular setae ( Fig. 8 ), ventrally prolonged compound eyes ( Fig. 9 ) and the longer sense-cones. From breviconus , it can easily be distinguished by the key above. From jatrophae , it differs in the longer head with distinctly posteriorly protruding basal collar, unarmed fore tibia ( Fig. 11 ) and weaker metanotal reticulation. Two females collected from Bali, Indonesia and Mindanao, the Philippines, listed in the non-paratypic specimens could not be discriminated from the type series from Malaysia.

Figures

FIGURES 8–14. Aesthesiothrips elongatus sp. n., female. (8) Head; (9) eyes, ventral surface; (10); antena; (11) fore tibia and tarsus; (12) ferna & mesopresternum; (13) metanotum & pelta; (14) 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.