Thrips trehernei Priesner

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 : 54-55

Thrips trehernei Priesner

( Figs. 239–244 )

Female macroptera. Body uniformly dark brown; antennal segments I to II dark brown, but paler than head, III brownish yellow, IV to V brownish yellow with distal third to half shaded, VI pale brown with basal third slightly pale, VII pale brown; fore wings including clavus uniformly brown; all femora dark brown, fore tibiae brown and gradually yellowish toward apex, mid and hind tibiae dark brown, fore tarsi brownish yellow, mid and hind tarsi pale brown; prominent body setae dark. Head ( Fig. 239 ) constricted just behind compound eyes, widest near compound eyes and rounded at cheeks. Compound eyes large. Ocellar setae III outside ocellar triangle, just anterior to hind ocelli. Postocular setae short and subequal in length to or slightly shorter than longitudinal diameter of hind ocelli. Antennae ( Fig. 240 ) 7-segmented, II with microtrichial rows very weak on dorsal surface; III to IV almost straight at each side and slightly tapering at ape, IV to V pedicelate, VI gently rounded at each side of basal twothirds and tapering to apex. Pronotum ( Fig. 239 ) sculptured with transverse striae, with 34–38 discal setae; posteroangular setae 2 pairs, setae I 55–84 microns long, 0.4–0.5 times as long as pronotal median length and longer than setae II; posteromarginal setae 3 pairs, all setae small and subequal in length. Mesonotum with CPS anteromedially. Metascutum ( Fig. 241 ) sculptured with longitudinal anastomosing striae except anteromedially; median pair of setae far from anterior margin; CPS absent. Fore wing first vein with seven (rarely six) basal and three distal setae. Abdominal tergites III to VII with no lines of sculpture reaching at median CPS; tergite II usually with 4 lateral marginal setae, a small seta often present at pleurotergite II near tergite; tergite VIII ( Fig. 242 ) with posteromarginal comb complete, but microtrichia irregular spaced; tergite IX with 2 pairs of CPS; sternite I with three microsetae; sternites III to VII with 9–13 discal setae arranged in irregular line; sternite VII with S1 setae in front of posterior margin, twice of diameter of the setal base from posterior margin; pleurotergites III to VII without discal setae no ciliate microtrichia. X 1 +2X 2 +X 3 =385–438 (mean=411±14, n=36) (X 1 +2X 2 +X 3: shown in T. griseus ).

Male macroptera. Body colour uniformly dark brown, fore wings almost uniformly pale brown, antennal segments paler than that of female. Abdominal tergite VIII ( Fig. 243 ) almost without posteromarginal comb, only a few small microtrichia present laterally; tergite IX with S1 setae at level of S2 setae and slightly longer than S2 setae, their bases equidistant; sternites III to VI or VIII with one to five discal setae; sternites III to VII ( Fig. 244 ) each with a transverse or oblong pore plate.

Specimens examined. JAPAN, Honshu: Kanagawa Pref., Yokosuka City, Kannonzaki: 9 females & 3 males on flowers of Taraxacum sp. [ Asteraceae ], 24-ix-2007, M. Masumoto (TUA); 51 females & 28 males on flowers of Taraxacum sp. , 3-x-2007, M. Masumoto (TUA). AUSTRIA: Tirol, Rinn (nr. Innsbruck), 1 male Aus Fangschalen auf bluhender Wisse, 5-vi-1975, K. Thaler (TUA). SWITZERLAND: Berner, Oberland, Wengen, 1300m, 1 female on flowers of Leontodon hispidus [ Asteraceae ], E. Franz (TUA).

Distribution. Japan (Honshu), India, Hawaii, New Zealand, Australia, Europe, North America.

Biology. This species is mainly associated with Taraxacum flowers [ Asteraceae ].

Comments. This species is here newly recorded from Japan. It is originally from Europe and probably has expanded its distribution to other areas together with dandelion and human trading activities. Body size of Japanese specimen is apparently smaller than European individuals (1550–2070 microns according to zur Strassen, 2003). The Japanese populations are apparently closer to North American populations than European populations, judging from body size and setal length in Nakahara (1994). Thrips physapus Linnaeus had been recorded from New Zealand ( Mound & Walker, 1982) but it is a misidentification ( Nakahara, 1994).

Figures

FIGURES 239–252. Thrips species. T. trehernei, female 239–242: (239) Head & pronotum; (240) Antenna, right; (241) Metascutum; (242) Tergites VIII–X. T. trehernei, male 243–244: (243) Tergites VIII–IX; (244) Sternite VI. T. typicus sp. n., female 245–249: (245) Head & pronotum; (246) Antenna, right; (247) Metascutum; (248) Tergite V & pleurotergite, right side; (249) Tergites VIII–X. T. typicus sp. n., male 250–252: (250) Antennal segment VI; (251) Tergites VIII–IX, sculpture omitted; (252) Sternite V, sculpture omitted.