Drepanothrips reuteri Uzel

Masumoto, Masami & Okajima, Shûji, 2007, The genus Scirtothrips Shull (Insecta, Thysanoptera, Thripidae) and three related genera in Japan, Zootaxa 1552, pp. 1-33 : 10-13

Drepanothrips reuteri Uzel

(Figs. 4–5)

Drepanothrips reuteri Uzel, 1895: 213 .

Drepanothrips reuteri Uzel ; Mound & Palmer, 1981a: 473. (first record from Japan.)

Female. Distended body length about 1.1 mm. Body generally yellow to brownish yellow, head brown within ocellar triangle, pronotum pale brown medially, mesonotum and metascutum shaded, abdominal terga III to VIII pale brown in median half; antennal segments I to II yellow, III to VI dark brown; fore wings brown with extreme base barely pale; all legs yellow; prominent body setae pale or slightly shaded.

. Drepanothrips reuteri (female). (A) Head & pronotum; (B) Antenna (right); (C) Mesonotum & metascutum.

Head 2.1 times as wide as long, distinctly sculptured throughout. Ocellar setae III situated behind fore ocellus (Fig. 4A). Two pairs of long postocular setae almost as long as ocellar setae III present between compound eyes. Mouth-cone not reaching mesothorax. Antennal segment VI the longest, widest near base and tapering forward apex (Fig. 4B).

Pronotum 1.6 times as wide as long, with about 20 discal setae (including anteromarginals and lateralmarginals) (Fig. 4A). Metascutum with longitudinal reticulations having internal wrinkles at middle; median pair of setae situated at anterior margin (Fig. 4C). Fore wings with 27 setae on costal vein, six basal and three distal setae on first vein.

Abdominal terga II to VII with posteromarginal microtrichia lateral to B2 setae ( Fig. 5 A); tergum VIII with B1 setae slightly longer than distance between their bases, without microtrichia at middle; tergum IX without microtrichia; tergum X without microtrichia; sterna II to VII with discal microtrichial rows lateral to B2 setae. Ovipositor 1.6 times as long as pronotal median length.

Measurements in microns of one female from Honshu. Distended body length 1060. Head length 58, width across cheeks 123; compound eyes dorsal length 50, width 40. Pronotal median length 100, width 163; posteromarginal setae I length 15, setae II length 23–25. Metascutal median length 65, median setae length 20. Fore wings length 650, width at middle 40. Abdominal tergum IX median length 60; B1 setae length 55–58, B2 setae length 48–50, B3 setae length 39–40, mid–dorsal setae length 38–40; tergum X median length 33; B1 setae length 55–58, B2 setae length 53. Ovipositor length 160. Antennal segments I to VI length (width) as follows: 23 (23), 30 (30), 40 (18), 33 (18), 33 (18), 60 (18).

Male. Distended body length about 0.7 mm. Body colour as in female, drepanae dark ( Fig. 5 B).

Measurements in microns of one male from Honshu. Width of head and antenna probably incorrectly as specimens were pressured by cover slip. Distended body length 670. Head length 63?, width across cheeks 128?; compound eyes dorsal length 53?, width 38?. Pronotal median length 78, width 140; posteromarginal setae I length 15, setae II length 20. Metascutal median length 53, median setae length 15. Fore wings length 480, width at middle 30. Antennal segments I to VI length (width) as follows: 18 (23?), 28 (28?), 28 (19?), 25 (16?), 30 (19?), 53 (19?).

Specimens examined. Japan, Honshu, Fukushima Pref., Kitashiobara-mura, 1 female on leaves of Lindera praecox [ Lauraceae ], 21-viii-2003, M. Masumoto (TUA); Gunma Pref., Mt. Hotaka (Joshu Hotaka), 1 female from unknown host, 26-v-1990, T. Nonaka (TUA); Ibaraki Pref., Yatabe, 2 males on Morus bombycis [ Moraceae ], 16-viii-1987, M. Miyazaki (NIAES); Ibaraki Pref., Yatabe, 1 female, 2 males, on Morus bombycis , 25-viii-1987, M. Miyazaki (NIAES). Izu-shotou Isls, Hachijo-jima Is., Minamiasakawa-machi, on undetermined tree leaves, 6-v-1993, T. Nonaka (TUA).

Comments. This species is distributed widely in Europe and North America, and is known as a pest of grape in these areas ( Mound et al., 1976; Mound & Palmer, 1981a). However, Scirtothrips dorsalis is known as a pest of this crop in Japan.

Figures

FIGURE 5. Drepanothrips reuteri. (A) Abdominal tergum VI, left side (female); (B) Abdominal segments IX – X, right side aspect (male).