Thrips ogasawarensis, Masumoto & Okajima, 2013

Masumoto, Masami & Okajima, Shûji, 2013, Review of the genus <i> Thrips </ i> and related genera (Thysanoptera, Thripidae) from Japan, Zootaxa 3678 (1), pp. 1-65 : 43-44

Thrips ogasawarensis sp. n.

( Figs. 164–170 )

Female macroptera. Distended body length 1.2–1.5 mm. Body uniformly dark brown; antennal segments I to II dark brown with apex of II slightly pale, III yellow, IV to VII dark brown; fore wings brown with basal fifth, clavus pale with base shaded; all femora dark brown, fore tibiae yellow, mid and hind tibiae yellowish brown with apices yellowish, all tibiae yellow; prominent body setae dark brown. Head ( Fig. 164 ) 0.5–0.6 times as long as wide, rounded at cheeks, distinctly sculptured within ocellar triangle. Ocellar setae III just lateral to fore ocellus. Postocular setae I the longest and much longer than longitudinal diameter of hind ocelli, III slightly shorter than I, II and IV minute. Antennae ( Fig. 165 ) 7-segmented, segment II with some microtrichial rows on dorsal surface, III the longest or subequal length to VI, III to V straight or slightly rounded at each side and without apical neck, IV to V weakly pedicelate; VI widest near middle and tapering to apex, with 12 setae. Antennal segments I to VII length/ width ratio as follows: 0.9–1.0, 1.3–1.5, 2.6–3.2, 2.5–3.2, 2.0–2.2, 2.8–3.2, 1.7–2.0. Pronotum ( Fig. 164 ) 0.7–0.8 times as long as wide, strongly sculptured with transverse striae, with more 35 discal setae; anterior margin without long setae; posteroangular setae 2 pairs, setae I 0.4–0.5 times as long as pronotal median length and slightly longer than or almost as long as setae II; posteromarginal setae 3 pairs, setae I the longest. Mesonotum sculptured with transverse anastomosing striae; CPS present anteromedially. Metascutum ( Fig. 166 ) sculptured with longitudinal striae except anterior to median pair of setae, lines of sculpture more or less ill-formed at middle; median pair of setae behind anterior margin, about 0.6 times as long as metascutal median length; CPS present. Fore wing costal vein with 26–32 setae, first vein with long gap in setal row, seven basal and three distal setae, second vein with 16– 20 setae. Abdominal tergites with small scallops along posterior margin, these scallops distinct on posterior segments; tergites III to VIII ( Fig. 167 ) with no lines of sculpture extending to mesad of S1 setae; tergite II with 4 lateral marginal setae; tergite VIII with posteromarginal comb complete, often irregular in length or space; tergite IX with both anterior and posterior pairs of CPS, S1, S2, S3 and MD setae each 1.0–1.2, 1.3–1.4, 1.1–1.3 and 0.5 times as long as median length of the tergite; tergite X with S1 and S2 setae each 1.3–1.7 and 1.3–1.7 times as long as median length of the tergite; sternite I without microsetae anteromedially; sternites III to VII ( Fig. 168 ) with (II with 3 or 4) about 14 discal setae transversely arranged in nearly straight line; sternite VII with S1 setae at or near posterior margin, at most as wide as diameter of the setal socket from posterior margin; pleurotergites without discal setae, with very weak dentate microtrichia along lines of sculpture. Ovipositor 1.9–2.0 times as long as pronotal median length.

Measurements of holotype female. Distended body length 1370. Head length 89 (length including anterior prolongation 101), width across cheeks 140; compound eye dorsal length 50, width 38. Pronotal median length 125, width 175; posteroangular setae I length 51–53, setae II length 49–50; posteromarginal setae I 25. Metascutal median length 75, median setae length 43–45. Fore wing length 710, width at middle 50. Abdominal tergite IX median length 63; S1 setae length 78–80, S2 setae length 93–95, S3 setae length 80, MD setae length 35; tergite X length 63, S1 setae length 90, S2 setae length 85. Ovipositor length 250. Antennal segments I to VII length (width) as follows: 25 (28), 33 (24), 48 (15), 43 (15), 33 (15), 48 (15), 13 (6).

Male macroptera. Distended body length 1.0– 1.1 mm. Body uniformly dark brown. Antennal segment VI with more setae on dorsal surface than in female. Abdominal tergite VIII ( Fig. 169 ) with posteromarginal comb medially; tergite IX with S1 setae at level of S2 setae and slightly shorter than S2 setae, their bases equidistant; sternites III to VII ( Fig. 170 ) each with an oblong pore plate, 38–80 microns wide.

Measurements of paratype males. Distended body length 970–1080. Head length 71–79 (length including anterior prolongation 80–86), width across cheeks 113–125; compound eye dorsal length 50–51, width 33–38. Pronotal median length 95–110, width 135–158; posteroangular setae I length 40–50, setae II length 33–48; posteromarginal setae I length 20–25. Metascutal median length 55–65, median setae length 28–38. Fore wing length 520–600, width at middle 35–40. Antennal segments I to VII length (width) as follows: 23–25 (24–25), 28– 30 (21–23), 40–43 (14–15), 38–40 (14–15), 28–30 (14–15), 45–50 (14–15), 10–13 (6).

Type series. Holotype female, Japan, Ogasawara Islands , Chichi-jima Is., Mt. Asahi-yama, on evergreen tree leaves (unidentified), 11-iii-1988, S. Okajima.

Paratypes: 71 females, 43 males, same data as holotype. Chichi-jima Is.: 12 females, 3 males, same locality and date as the holotype, on Pseudosasa japonica [ Poaceae ], S. Okajima. Mt. Mikazuki-yama: 11 females, 2 males on grass, 10-iii-1988, S. Okajima; 2 females, 1 male on flowers of Bidens pilosa [ Asteraceae ], 8-i-2004, S. Sugimoto; 1 male on Carex sp. [ Cyperaceae ], 8-i-2004, S. Sugimoto. Ougiura, 15 females & 1 male on flowers of Rhaphiolepis indica [ Rosaceae ], 9-i-2004, S. Sugimoto. Higashidaira, Chuou-san, 1 female & 1 male on Psychotria homalosperma [ Rubiaceae ], 14-vii-2004, K. Watanabe. Haha-jima Is.: Okimura: 4 females, 1 male on flowers of Hibiscus sp. [ Malvaceae ], 9-iii-1990, S. Okajima; 2 females on flowers of Bidens pilosa [ Asteraceae ], 15-xii-2003, Y. Tatematsu. The holotype and most paratypes are deposited in TUA.

Comments. This species has been recognized as a population of T. coloratus with dark body in Ogasawara Islands ( Palmer, 1992). However, these individuals are here recognized as a distinct species with S1 setae of abdominal sternite VII at or near the posterior margin in females and tergite VIII of male with a posteromarginal comb at middle. In contrast, in T. coloratus , sternites VII of female has the S1 setae in front of the posterior margin and tergite VIII of male is without a posteromarginal comb.

Figures

FIGURES 155–165. Thrips species. T. nonakai sp. n., female. 155–161: (155) Head & pronotum; (156) Antenna, right; (157) Mesonotum & metascutum; (158) Fore wing, right; (159) Tergite VI & pleurotergite, right side; (160) Tergites VIII–X; (161) Sternite VI. T. nonakai sp. n., male 162–163: (162) Tergites VIII–IX; (163) Sternites III–V, sculpture omitted. T. ogasawarensis sp. n., female 164–165: (164) Head & pronotum; (165) Antenna, right.

FIGURES 166–178. Thrips species. T. ogasawarensis sp. n., female 166–168: (166) Metascutum; (167) Tergite VIII; (168) Sternite VII, sculpture omitted. T. ogasawarensis sp. n., male 169––170: (169) Tergites VIII–IX, sculpture omitted; (170) Sternite VII, sculpture omitted. T. orientalis, female 171–176: (171) Head & pronotum; (172) Antenna, right; (173) Metascutum; (174) Tergite IV & pleurotergite, left side; (175) Tergite VIII; (176) Sternites V–VII, sculpture omitted. T. orientalis, male 177–178: (177) Tergite IX and left side of segment X; (178) Sternite VI, sculpture omitted.