Mycterothrips glycines (Okamoto)

Okajima, Masami Masumoto And Shûji, 2006, A revision of and key to the world species of Mycterothrips Trybom (Thysanoptera, Thripidae), Zootaxa 1261 (1261), pp. 1-90 : 53-57

Mycterothrips glycines (Okamoto)

( Figs. 78–86)

Euthrips glycines Okamoto, 1911: 221–222 .

Taeniothrips (Physothrips) glycines (Okamoto) ; Moulton, 1928: 327.

Mycterothrips glycines (Okamoto) ; Bhatti, 1969: 378.

Diagnosis. Body colour generally yellowish brown to pale brown, pronotum often partly dark, anterior half of mesonotum and metascutum often slightly shaded, abdominal terga often dark along median part of antecostal line and medially at each side; antennal segment I yellow, II brown with extreme apex pale, III yellowish brown with basal third yellow, IV dark brown often with basal fourth paler, V to VIII dark brown. Head slightly rounded at cheeks ( Fig. 78). Antennal segment III the longest, segment VI slightly shorter than segment IV ( Fig. 79). Pronotum with about 40 discal setae ( Fig. 78). Mesonotum without CPS anteromedially; median pair of setae near posterior margin ( Fig. 80).

Metascutum irregularly, often weakly, reticulated at middle; median pair of setae at or near anterior margin ( Fig. 80). Abdominal terga II to VIII with numerous ciliate microtrichia on lines of sculpture, smooth medially ( Figs. 81–82); tergum II with four lateral marginal setae ( Fig. 81); tergum IX with both anterior and posterior pairs of CPS; terga VII to VIII with B4 setae minute, B4 setae usually minute on tergum VI ( Fig. 82); sterna without discal setae. Male has antennal segment VI of intermediate type, but much longer than that of female with numerous long setae and without microtrichia ( Fig. 83). Abdominal tergum IX with a pair of CPS, SB1 setae about half length of B1 setae ( Figs. 84–85); sterna V to VIII with one to four discal setae ( Fig. 86). Hypomere expanded at apex .

Specimens examined. Japan: 7 females and 3 males, Aomori Pref., Tsuruta­cho, side of the river Itsuki­gawa, leaves of Glycine max [Leguminosae], 14­x­1997, M. Masumoto (TUA). 19 females and 1 male, Fukushima Pref., Kitakata City, Sekishiba­cho, on leaves of Glycine max , 22­ix­2000, M. Masumoto (TUA). 7 females, Fukushima Pref., Kitakata City, Sekishiba­cho, on leaves of Glycine max , 9­ix­2001, M. Masumoto (TUA). 12 females and 2 males, Ibaraki Pref., Yuhki City, on leaves of Solanum melongena [ Solanaceae ], 8­ix­1992, H. Nakanishi (TUA). 2 females, Ishikawa Pref., Ohara, leaves of Phaseolus angularis [Leguminosae], 23­ix­1986, T. Togashi (TUA). 2 females, Ishikawa Pref., Nonoichi City, leaves of Glycine max , 15­vii­1988, T. Togashi (TUA). 10 females, Fukuoka Pref., Asakura­gun, Asakura­cho, Kozuka, on leaves of Cucumis sativus [ Cucurbitaceae ], 30­v­1993, Y. Nakajima. 1 female, Nagano Pref., Sugadaira, M. R. C., on leaves of Alnus japonica [ Betulaceae ], 19­vii­1995, T. Tsutsumi (FU). 3 females, Hokkaido, Tomakomai City, Douou Express way, Misawa Service­area, on leaves of Syringa vulgaris [ Oleaceae ], 27­ix­2004, T. Tsutsumi (FU).

Comments. This species is associated with legume crops, such as Glycine max , in Japan ( Umeya et al., 1988), but is also collected from other many plants including members of the following families: Convolvulaceae, Cruciferae , Cucurbitaceae , Moraceae , Solanaceae and Theaceae ( Miyazaki & Kudo, 1988).

Females of this species are very similar to those of M. nilgiriensis in the following character states: mesonotum without anteromedian CPS; abdominal terga with numerous ciliate microtrichia on sculpture lines, tergum II with four lateral marginal setae, terga VII to VIII with B4 setae minute, B4 setae usually minute on tergum VI, tergum IX with two pairs of CPS, sterna without discal setae. However, females of these species can barely be distinguished from each other as follows. In M. glycines , antennal segment I yellow, III sharply yellow in basal third, VI slightly longer than IV and slightly rounded in basal third but rapidly tapering to apex; mouth­cone relatively wider and shorter, slightly rounded at each side, usually 1.1 (at most 1.2) times as long as dorsal length of head ( Fig. 78). In M. nilgiriensis , antennal segment I is more or less shaded, often brown, III usually brown, often slightly paler than II but not sharply yellow at base, VI slightly shorter than IV and gently tapering to apex ( Figs. 104–105, 107–109); mouth­cone relatively longer and more slender, and pointed at apex, often exceeding posterior margin of pronotum, usually 1.4 times as long as dorsal length of head ( Figs. 110, 114–115). In contrast, males of these two species are quite distinct. In M. glycines , antennal segment VI of intermediate type ( Fig. 83) and abdominal tergum IX with a pair of SB1 setae usually about half length of B1 setae near posterior margin ( Figs. 84–85). In M. nilgiriensis , antennal segment VI typical of Rhopalandrothrips ­ type ( Fig. 106), and tergum IX with SB1 setae vestigial ( Fig. 113).