Thrips minutissimus Linnaeus

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 : 37-39

Thrips minutissimus Linnaeus

( Figs. 143–148 )

Female macroptera. Body almost uniformly pale brown to brown, often slightly paler in thorax; antennal segments I to II shaded, III pale brown, IV to VII brown; fore wings slightly and almost uniformly shaded; all legs yellowish brown, paler than body; prominent body setae pale to slightly shaded. Head ( Fig. 143 ) cheeks rounded, weakly sculptured within ocellar triangle. Ocellar setae III at middle of fore and hind ocelli within ocellar triangle. Postocular setae III the longest, II much shorter than I and III. Antennae ( Fig. 144 ) 7-segmented, II with some microtrichial rows on dorsal surface, III to VI short and stout, rounded lateral margin, IV to V pedicelate, VI rounded at each side, the longest. Pronotum ( Fig. 143 ) sculptured with wide spaced transverse striae, with 29–34 discal setae; posteroangular setae 2 pairs; posteromarginal setae 3 pairs, setae I the longest. Mesonotum sculptured with transverse anastomosing striae; CPS absent anteromedially. Metascutum ( Fig. 145 ) with longitudinal sculpture except anteromedially, lines of sculpture anastomosing at middle; median pair of setae far from anterior margin; CPS absent. Fore wing first vein without long gap in setal row, about eight setae at distal half. Abdominal tergites IV to VIII ( Figs. 146, 147 ) with a few or no lines of sculpture slightly extending to mesad of S2 setae; tergite II with 4 lateral marginal setae; tergite VIII with posteromarginal comb complete, but length of microtrichia often irregular; tergite IX with 2 pairs of CPS; sternites III to VII ( Fig. 148 ) with about 10 discal setae arranged in transverse line; sternite I with one or two microsetae anteromedially; sternite VII with S1 setae much far from posterior margin; pleurotergites with two to five discal setae and no ciliate microtrichia.

Male. Unknown in Japan.

Specimens examined. JAPAN, Honshu: Fukushima Pref., Kitashiobara-mura: 4 females on flowers of Pinus densiflora [ Pinaceae ], 2-v-2000, M. Masumoto (TUA); 1 female on flower, 2-v-2000, M. Masumoto (TUA); 22 females on flowers of Lindera praecox [ Lauraceae ], 3-v-2005, M. Masumoto (TUA); 42 females on flowers of Lindera praecox , 4-v-2005, M. Masumoto (TUA); 7 females on flowers of Salix sp. [ Salicaceae ], 4-v-2005, M. Masumoto (TUA); 1 female on leaves of Cornaceae , 4-v-2005, M. Masumoto (TUA); 20 females on leaves & flowers of Lindera praecox , 4-v-2006, M. Masumoto (TUA); 3 females on flowers of Salix sp. , 4-v-2006, M. Masumoto (TUA); 24 females on flowers of Lindera praecox , 5-v-2006, M. Masumoto (TUA); 21 females on flowers of Salix sp. , 5-v-2006, M. Masumoto (TUA); 3 females on leaves of Podocarpus macrophyllus ? [ Podocarpaceae ], 5-v-2006, M. Masumoto (TUA); 9 females on flowers of Salix sp. , 3-v-2007, M. Masumoto (TUA); 4 females on flowers of Salix sp. , 4-v-2007, M. Masumoto (TUA). Gunma Pref., Kusatsu-cho: 5 females on leaves of Alnus hirsta [ Betulaceae ], 12-v-2002, M. Masumoto (TUA); 1 female on leaves of Alnus hirsta , 13-v- 2002, M. Masumoto (TUA); 1 female on leaves of Betulaceae , 11-v-2006, M. Masumoto (TUA). Chiba Pref., Sakae-machi, Bousouno-mura, adjeacent Narita City: 50 females on flower of Eurya japonica [ Theaceae ], 11-iv- 2011, M. Masumoto (TUA). GERMANY, Bausenberg/Eifel (Niederzissen Brohlf.), Rheinland, 1 female on flowers of Prunus spinosa [ Rosaceae ], 14-iv-1972, R. zur Strassen (TUA).

Distribution. Japan (Honshu), Europe.

Comments. This species is here newly recorded from Japan, but was reported as Thrips sp.1 ( Tsutsumi, 1995) . In Japan it has been found on various flowers, young leaves and flower-buds or leaf-buds in early spring.

Figures

FIGURES 143–154. Thrips species. T. minutissimus, female 143–148: (143) Head & pronotum; (144) Antenna, right; (145) Metascutum; (146) Tergite VI & pleurotergite, right side; (147) Tergites VIII–X; (148) Sternite VII, sculpture omitted. T. nigropilosus, female 149–152: (149) Head & pronotum; (150) Antenna, right; (151) Metascutum; (152) Tergites II–III, right side. T. nigropilosus, male 153–154: (153) Tergites VII–IX; (154) Sternite VI.