Phlaeothrips tonkinensis sp. n., 2024

Okajima, Shûji & Masumoto, Masami, 2024, The genus Hoplandrothrips and its relatives (Thysanoptera: Phlaeothripidae) from Southeast Asia and Taiwan, Zootaxa 5489 (1), pp. 22-91 : 57-58

Phlaeothrips tonkinensis sp. n.

( Figs 54–55 , 279–288 )

Female (macroptera). Distended body length: about 3.6mm. Dorsal surface of head and pronotum sculptured weakly. Body brown, tube darkest, blackish brown. Antennal segments I– II and VII – VIII brown, segment III yellow on basal 1/2, brown on distal 1/2, segments IV – VI brown with pedicels yellowish. Femora and tibiae brown, but fore tibiae a little paler; tarsi yellowish. Fore wings almost clear. All prominent setae pale. Head ( Fig. 279 ) longer than wide, 1.59 times as long as wide, dorsal surface very weakly sculptured with transverse reticulation, but with distinct fine reticulation at ocellar region. Cheeks weakly arched, each with a sub-basal short stout seta; postocular cheek setae minute, arising on small tubercles. Postocular setae much shorter than width of eye, 50–55μm apart from eyes, about 160μm apart from each other in holotype, dilated at apex. Eyes well-developed, 0.36 times as long as head. Posterior ocelli close to eyes, anterior ocellus directed forward; distance between posterior ocelli almost as long as diameter of an ocellus, 27μm apart from each other. Antenna ( Figs 285 & 286 ) 8-segmented, about 2.0 times as long as head; segment VIII rather slender, not constricted basally, cone shaped; segment III about 2.5 times as long as wide; segments III – VI rather truncate at apex. Mouth cone long and rather pointed, not reaching prosternal ferna; maxillary stylets deeply retracted into head capsule, reaching posterior margin of eyes, close together medially; maxillary guide rather developed. Pronotum weakly sculptured marginally, almost 1/2 as long as head, posterior margin almost straight; 5 pairs of prominent setae dilated, am and aa short and subequal in length. Prosternal ferna ( Fig. 287 ) distinct, inner margins pointed, close together; mesopresternum divided into three plates, two lateral triangles and a median semicircle. Mesonotal lateral setae developed. Metanotum ( Fig. 282 ) sculptured with longitudinal fine striae or reticles, median pair of setae acute, 48–57μm apart from anterior margin, 118μm apart from one another. Fore tibia ( Fig. 281 ) with an apical inner flat protrusion; fore tarsal tooth directed laterally. Fore wings parallel sided, each with 24–26 duplicated cilia; sub-basal setae ( Fig. 288 ) S1 and S2 dilated, S3 pointed, longer than S2. Pelta ( Figs 282 & 283 ) bell-shaped. Abdominal tergites II – VII each with two pairs of sigmoid wing-retaining setae, tergite II with two small accessory wing-retaining setae, arising before regular two pairs. Tergite IX posteromarginal setae weakly expanded, shorter than tube, S2 shorter than S1, internal setae short. Tube ( Fig. 284 ) about 0.7 times as long as head, about 2.9 times as long as wide. Terminal setae shorter than tube.

Measurements (holotype female in μm). Body length 3650 (distended). Head length 405, from anterior margin of eyes 380, width across eyes 240, maximum width across cheeks 255; eyes length 145, width 90; diameter of posterior ocelli 26–31; postocular setae about 40. Antenna total length 790, segments I–VIII length (width) as follows: 80 (50), 75 (37), 130 (52), 135 (52), 123 (40), 100 (32), 80 (26), 50 (15). Pronotum length 195, width 356. Setae on prothorax: am about 40, aa about 40, ml? 40, pa 70–75, epim 75, cox 55. Metanotal median setae about 50. Fore wing length?. Sub-basal wing setae: S1 85, S2 110, S3 125. Tergite IX setae: S1 210, S2 165. Tube length 288, maximum width 100; terminal setae 210–215.

Male (macroptera). Distended body length: about 4.0mm. Colour similar to female. Head ( Fig. 280 ) 1.77 times as long as wide. Prothorax enlarged, am reduced and pointed, aa elongate; inner margins of ferna rounded. Fore coxa distinctly sculptured, with some stout short setae on posterior margin; fore femur enlarged; fore tibial apical flat protrusion stouter than that of female; fore tarsal tooth stout, robust and wide-based. Metanotum raised antero-medially formed an inverted triangle, with polygonal reticulation. Abdominal sternites II–V with transverse reticulate areas or pore plates lying behind antecostal sutures, but sternite VIII without pore plate; tergite IX S2 setae shorter than width of tube. Tube 0.65 times as long as head.

Measurements (paratype male in μm). Body length about 4040 (distended). Head length 460, from anterior margin of eyes 435, width across eyes 260, maximum width across cheeks 258; eyes length 156, width 90; diameter of posterior ocelli 30–35; postocular setae 75–85. Antenna total length 955, segments I–VIII length (width) as follows: 92 (55), 80 (40), 162 (58), 165 (58), 150 (45), 122 (35), 92 (28), 53 (16). Pronotum length 280, width 425. Setae on prothorax: am 25–28, aa 85–95, ml 90, pa 40–58, epim 108–110, cox 80–90. Fore wing length?. Sub-basal wing setae: S1 75–80, S2 88–90, S3 120. Tergite IX setae: S1 230, S2 80–83. Tube length 300, maximum width 120; terminal setae 250.

Type series. Holotype: macropterous female, Vietnam, Tam Dao , 23.v.1993, K. Matsumoto . Paratype: Vietnam, 1 large male, collected with holotype .

Remarks. The surface of head and prothorax of P. tonkinensis are very weakly sculptured, but distinctly reticulate at the ocellar region. The male has no pore plate on the abdominal sternite VIII, but has a reticulate area or pore plate placed behind the antecostal suture on each of sternites II–V, though other character states are indistinguishable from the congeners.

Figures

FIGURES 43–55. Hoplandrothrips and Phlaeothrips species. H. samirseni comb. n. 43–44: (43) female; (44) large male. H. sapae sp. n. 45–47: (45) female; (46) small male; (47) large male. H. sulawesi sp. n. 48–50: (48) female; (49) large male; (50) small male. H. thailandicus sp. n.: (51) female. P. annamensis sp. n. 52–53: (52) small male; (53) large male. P. tonkinensis sp. n. 54–55: (54) female; (55) male.

FIGURES 279–288. Phlaeothrips tonkinensis sp. n. (279) Head and prothorax, female; (280) head, prothorax and fore leg, male; (281) fore tibia and tarsus, female; (282) metanotum and pelta, female; (283) pelta, male; (284) tube, female; (285) antennal segments III–IV, female; (286) antennal segments III–VIII, female; (287) prosternum and mesopresternum, female; (288) sub-basal wing setae, female.