Ethirothrips longiceps, 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 : 31-33

Ethirothrips longiceps sp. n.

( Figs 69–76 , 223 )

Female (macroptera). Distended body length: 4.1–4.4mm. Colour uniformly dark brown.Antennal segment III with extreme base yellowish. Tarsi brown, a little paler than tibiae. Fore wings weakly shaded with brown, with a pale brown streak in basal half. Prominent setae yellowish brown to brown. Head ( Fig. 69 ) elongate, about 1.9 times as long as broad, broadest across cheeks just behind eyes; dorsal surface sculptured marginally with transverse row of weak striae or reticulation. Cheeks sub-parallel, almost straight, each with an ommatidium-like structure just behind eyes; each with a few minute setae. Postocular setae situated behind eyes, much longer than eyes, 0.43–0.48 times as long as head in holotype, nearly pointed; postocellar setae variable in length, but mostly shorter than diameter of a posterior ocellus (holotype has somewhat long postocellars, 25–40μm), situated behind posterior ocelli. Eyes comparatively small, 0.22 times as long as head; posterior ocelli close to eyes, 22–24μm in diameter, 45μm apart from each other in holotype. Antennae ( Fig. 74 ) about 1.5 times as long as head; segment VIII shorter than segment VII, not constricted basally and widely fused to VII; segment III 2.8 times as long as broad in holotype, longer than segment IV; sense-cones short, segment IV with five sense-cones (with one outer small sense-cone in addition to four usual sense-cones) ( Fig. 75 ). Maxillary stylets deeply retracted, reaching postocular setae, about 1/2 of head width apart from each other. Pronotum much shorter than half the length of head, 0.36 times as long as head in holotype; dorsal surface almost smooth, very weakly sculptured with transverse reticulation posteriorly. Prominent setae nearly pointed, am shorter than 30μm. Mesopresternum ( Fig. 70 ) narrow, posterior margin and lateral margins continuously arched, without distinct angles. Metanotum ( Fig. 73 ) without CPS. Fore femora moderately enlarged, without long setae; fore tibia ( Fig. 71 ) with an apical small tubercle; fore tarsus with a wide-based stout tooth. Fore wings each with 22–23 duplicated cilia in holotype; sub-basal setae S1 minute, S2 and S3 blunt or nearly pointed. Pelta ( Fig. 73 ) broad, without distinct lateral wings, the shape somewhat similar to that of Diaphorothrips (cf. Fig. 244 in Mound & Palmer, 1983). Posteromarginal setae on abdominal tergite IX sharply pointed, longer than tube, S1 and S2 subequal in length. Tube ( Fig. 76 ) longer than head, 1.13 times as long as head in holotype, 3.7–3.8 times as long as broad, weakly swollen at base, constricted at apex.

Measurements (holotype female in μm). Body length about 4200 (distended). Head length 450, from anterior margin of eyes 440, width 240; eyes length 100, width 70–72; postocular setae 195–215. Antenna total length 670, segments I–VIII length (width) as follows: 78 (44), 70 (40), 113 (40), 103 (42), 100 (42), 80 (33), 55 (28), 40 (21). Pronotum length 162, width 317. Setae on prothorax: am 20–25, aa 35, ml 55–57, pa 70–75, epim 115–125, cox 50. Fore wing length 1625. Sub-basal wing setae: S1 25, S2 46 –57, S3 58 –62. Setae on tergite IX: S1 600, S2 600. Tube length 510, maximum width 136; terminal setae?400.

Male (macroptera). Distended body length: 3.5–3.9mm. The following description is based on non-paratypic male from Borneo: Colour and structure very similar to female. Head about 1.9 times as long as broad. Prothorax and fore legs stouter, pronotum 0.44 times as long as head. Tube 3.75 times as long as broad.

Measurements (non-paratypic male in μm). Body length about 3850 (distended). Head length 415, from anterior margin of eyes 390, width 215; eyes length 92–95, width 60; postocular setae 205–215.Antenna total length 610, segments I–VIII length (width) as follows: 63 (40), 72 (37), 107 (40), 100 (40), 100 (36), 73 (30), 50 (25), 35 (18). Pronotum length 185, width 332. Setae on prothorax: am less than 20, aa 40, ml 50, pa 65–66, epim 115–140, cox 50. Fore wing length?. Sub-basal wing setae: S1 16 –18, S2 53 –55, S3 63–67. Setae on tergite IX: S1?, S2?. Tube length 450, maximum width 120; terminal setae?.

Type series. Holotype: macropterous female, Indonesia, Central Celebes (= Sulawesi), near Rantepao, Pedamaran , alt. about 1000m, on dead leaves and branches, 10.viii.1984, SO . Paratypes: Indonesia, same locality, habitat and collector as holotype, 2 females, 8.viii.1984 , 1 male, 12.viii.1984, 1 male, 14.viii.1984.

Non-paratypic specimens: Borneo, Sabah, N 5mls from Keningau, Bunsit, 6 females and 1 male, on dead leaves and branches, 1.iv.1989, K. Matsumoto; 1 female, Keningau, 13.iv.1990, H. Matsumoto; nr. Madai Cave , 1 female and 1 male, on dried twigs, 12.viii.1979, Y. Yoshikawa. Indonesia, Bali Is., Tabanan, Jatiluwih, Peteli Temple, 1 female, 13.viii.2006, SO .

Remarks. It is very interesting that the pelta of E. longiceps ( Fig. 73 ) is somewhat similar to that of Diaphorothrips species, such as D. clavipes (see Fig. 14 in Palmer & Mound 1978). 1978). Moreover, the fore tibia of this species has an inner tubercle in both sexes ( Figs 71 & 72 ), but it is smaller and situated apically, not subapically. Furthermore, antennal segment IV of longiceps has one outer small sense-cone in addition to usual four sense-cones as in Diaphorothrips species. From E. stenomelas , which also has five sense-cones on the segment, longiceps is easily distinguished by the different shape of the pelta. Eight females and two males listed in the non-paratypic specimens from Borneo could not be distinguished from this species. One female from Bali, Indonesia is also considered as same species, but with antennal segment III largely yellowish.

Figures

FIGURES 69–76. Ethirothrips longiceps sp. n. (69) Head, female; (70) mesopresternum, female; (71) fore tibia & fore tarsus, female; (72) fore tibia & fore tarsus, male; (73) metanotum & pelta, female; (74) antennal segments III–VIII, female; (75) antennal segment III, female; (76) tube, female.

FIGURES 223–234. Ethirothrips species, female. (223) E. longiceps sp. n.; (224) E. longisetis; (225) E. malaya sp. n.; (226) E. obscurus; (227) E. oculus sp. n.; (228) E. ommatus sp. n.; (229) E. puiensis sp. n.; (230) E. quadratus sp. n.; (231) E. rubeus, paratype; (232) E. rubeus from Thailand; (233) E. saigon sp. n.; (234) E. setosus sp. n.

FIGURES 235–246. Macrothripina genera and species. Ethirothrips species 235–243: (235) E. stenomelas, male; (236) E. (?) stenomelas, female from Mindanao; (237) E. tenuis sp. n., female; (238) E. terminalis sp. n., female; (239) E. thai sp. n., female; (240) E. tibialis, female; (241) E. tibialis, micropterous male; (242) E. tibialis, macropterous male; (243) E. virgulae, female. (244) Fernothrips femoralis gen. et sp. n., female. (245) Ischyrothrips crassus, female. (246) Polytrichothrips malayanus sp. n., female.

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.