Thrips floreus Kurosawa

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 : 32

Thrips floreus Kurosawa

( Figs. 109–115 )

Female macroptera. Distended body length 1.5–1.8 mm. Body uniformly dark brown; antennal segments I to II dark brown, III yellow, IV to V dark brown with extreme base slightly pale, VI to VII dark brown; fore wings dark brown with basal sixth pale, extreme base including almost of clavus dark; all femora dark brown, fore tibiae yellowish brown, mid and hind tibiae dark brown with base and apex yellowish, all tarsi brownish yellow; prominent body setae dark brown. Head ( Fig. 109 ) rounded at cheeks. Ocellar setae III outside or near margin of ocellar triangle, anterior to hind ocelli. Postocular setae I the longest, II and IV minute. Antennae ( Fig. 110 ) 7- segmented, segment II with some microtrichial rows on dorsal surface, III to IV rounded at each side and tapering to apex as short apical neck, with forked sensoria slightly longer, IV to V pedicelate, VI slender, rounded at basal third and tapering to apex. Antennal segments I to VII length/width ratio as follows: 0.8–0.9, 1.2–1.4, 2.3–2.6, 2.6– 2.7, 2.0–2.4, 3.3–3.6, 2.7–3.3. Pronotum ( Fig. 109 ) sculptured with transverse striae, with 21–27 discal setae; posteroangular setae 2 pairs; posteromarginal setae 3 pairs, setae I the longest. Mesonotum ( Fig. 111 ) with CPS anteromedially. Metascutum sculptured with longitudinal anastomosing striae except anteromedially, small wrinkles present between lines of sculpture; median pair of setae behind anterior margin; CPS present. Fore wing first vein with long gap in setal row, seven basal and three distal setae. Abdominal tergites II to VII ( Fig. 112 ) with lines of sculpture extending to middle between median CPS and S2 setae; tergite II with 4 lateral marginal setae; tergite VIII ( Fig. 113 ) with posteromarginal comb complete, often irregular in length; tergite IX with 2 pairs of CPS; sternites without discal setae; sternite I with three microsetae anteromedially; sternite VII with S1 setae far from posterior margin; pleurotergites without discal setae, with small dentate microtrichia along lines of sculpture. Male macroptera. Distended body length about 1.4 mm. Body colour similar to female. Abdominal tergite VIII ( Fig. 114 ) with no posteromarginal comb or a few weak microtrichia; tergite IX with S1 setae at or slightly anterior to level of S2 setae and subequal in length to S2 setae, slightly closer to S2 setae then each other; sternites III to VII each with a large transverse pore plate constricted at middle ( Fig. 115 ), 145–180 microns wide.

Specimens examined. JAPAN, Honshu: 285 females, 23 males ( FU, TUA) . Kyushu: 1 female ( TUA) .

Distribution. Japan (Honshu, Kyushu).

Biology. This is flower-living species. It appears to breed on Liliaceae , especially Liriope platyphylla .

Comments. This species runs to T. formosae Priesner in the key by Palmer (1992). Recently, the present authors had an opportunity to compare this species with T. formosae of Taiwan through the courtesy of Dr. Wang, Taiwan. As the result of the comparison, these species can be distinguished as follows: in T. floreus , antennal segment VI the longest and tapering at distal two-thirds, segment VII more than 2.7 times as long as width, segment III rounded at each side and much shorter than VI, male abdominal tergite VIII with only a few microtrichia on posterior margin, and sternites with very large pore plates; in T. formosae antennal segment III the longest and straight at each side, segment VII twice as long as wide, VI almost straight at basal two-thirds and weakly tapering to apex, male abdominal tergite VIII with microtrichia irregular in length but distinct on posterior margin medially, and sternites with transverse smaller (about 55 microns wide) pore plates.

Figures

FIGURES 104–115. Thrips species. T. flavus, female 104–106: (104) Head & pronotum; (105) Antenna, right; (106). Metascutum. T. flavus, male 107–108: (107) Tergites VIII–IX, sculpture omitted: (108) Sternite VII, sculpture omitted. T. floreus, female 109–115: (109) Head & pronotum; (110) Antenna, right; (111) Mesonotum & metascutum; (112) Tergite V & pleurotergite, right side; (113) Tergites VIII–X. T. floreus, male 114–115: (114) Tergites VIII–IX; (115) Sternite VI.