Mycterothrips shihoae, Okajima, 2006

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 : 78-82

Mycterothrips shihoae sp. nov.

( Figs. 134–141)

Description. Female. Distended body length 1.5–1.8 mm. Body almost uniformly yellow to yellowish brown, pronotum with brown patches, abdominal terga II to VI each with pale brown patch on anterior half of each side; antennal segments I to II yellow, III yellow with distal half shaded, IV brown with basal fourth yellow, V to VII or VIII brown; all legs pale yellow; fore wings and scale uniformly slightly shaded; prominent body setae dark.

Head 1.3–1.8 times as wide as long, cheeks straight. Ocellar setae III situated between posterior ocelli and 3.8–6.3 times as long as distance between their bases; postocular setae I slightly longer than others ( Fig. 134). Antennae usually 7­segmented, terminal style incompletely divided, or 8­segmented; III the longest; VII with outer sense cone short and not reaching apex of VIII ( Fig. 135a). Antennal segments I to VIII length/width: 0.8–1.2, 1.1–1.5, 2.3–3.0, 2.1–2.9, 1.6–2.4, 2.6–3.1, 1.7–4.0, 3.5.

Pronotum 1.3–1.6 times as wide as long, almost smooth, with 27–42 (mean 35, n=20) (37 in holotype) discal setae; posteroangular setae I almost as long as setae II and 0.4–0.5 times as long as pronotal median length; posteromarginal setae I 1.3–2.0 times as long as setae II and 0.3–0.4 times as long as pronotal median length ( Fig. 134). Mesonotum without anteromedian CPS; median pair of setae near posterior margin ( Fig. 136). Metascutum irregularly reticulated medially; median pair of setae at or near anterior margin and 0.5–0.6 times as long as metascutal median length ( Fig. 136). Fore wings usually with 23–32 (mean 27, n=40) setae on costal vein (holotype 29 on left, 26 on right), 10–15 (mean 13, n=40) setae on second vein (holotype 13 on left, 12 on right).

Abdominal terga and laterotergites with numerous ciliate microtrichia ( Figs. 138– 139), a few lines of sculpture slightly extending mesad of B2 setae on terga II to VII ( Fig. 138), often a surplus seta present on one side medially on some terga, posterior margin of terga II to VII with microtrichia developed laterally ( Fig. 137); tergum II with three lateral marginal setae; terga V or VI to VIII with B4 setae minute gradually ( Fig. 139); tergum IX with posterior pair of CPS only, B1 setae, B2 setae and B3 setae 0.8–1.0 times, 1.0–1.1 times and 0.9–1.1 times as long as tergum IX median length, respectively ( Fig. 139); tergum X with median slit in distal half to third ( Fig. 139); sterna without discal setae. Ovipositor 2.0–2.3 times as long as pronotal median length.

Measurements (in µm). Holotype (female). Distended body length 1,685. Head length (width across cheeks) 115 (168), compound eye dorsal length (width) 63 (48), ocellar setae III length (interval) 51 (13). Pronotal median length (width) 153 (210), posteroangular setae I length 69, setae II length 66, posteromarginal setae I length 48, setae II length 31. Metascutal median length 103; median setae length 53. Fore wings length 955. Tergum IX median length 110, B1 setae length 100, B2 setae length 108, B3 setae length 105. Ovipositor length 325. Antennal segments I to VII length (width) as follows: 33 (38), 40 (33), 70 (25), 63 (25), 43 (20), 58 (20), 28 (10).

Male. Macropterous. Distended body length 1.1–1.3 mm. Antennae usually 8– segmented, sometime 7­segmented, segment VI distinctly longer than that of female, 0.3– 0.4 times as long as combined length of I to V, with numerous (22–29) setae and usually with a few microtrichia on ventral surfaces ( Fig. 140). Abdominal tergum IX with posterior pair of CPS near B1 setae, B1 closer to each other than to B2 setae and shorter than B2 setae; vestigial tubercles (=or setae?) present on posterior margin ( Fig. 141); sterna without discal setae. Hypomere almost not expanded at apex ( Fig. 141).

Measurements (in µm). Paratype (male). Distended body length 1140–1295. Head length (width across cheeks) 93–113 (133–150), compound eye dorsal length (width) 58– 65 (38–50), ocellar setae III length (interval) 39–48 (10–13). Pronotal median length (width) 110–125 (155–183), posteroangular setae I length 55–63, setae II length 50–62, posteromarginal setae I length 20–45, setae II length 15–23. Metascutal median length 75– 85; median setae length 30–43. Fore wings length 725–800. Antenna segments I to VIII length (width) as follows: 28–33 (30–38), 38–43 (28–30), 60–68 (23–25), 50–58 (20–25), 33–38 (20), 70–78 (18–23), 8–10 (8–10), 13–15 (5–8).

Type series. Japan: Holotype (female), Gunma Pref., Nakanojo­machi, Ichishiro, side of the river Agatsuma­gawa, on leaves of Euonymus alatus [ Celastraceae ], 13­v­2005, M. Masumoto. Paratypes: 312 females and 50 males same data as holotype. 66 females and 11 males, same host and locality as holotype, 14­v­2005, M. Masumoto. 11 females and 5 males, same locality as holotype, on leaves of Lindera glauca [ Lauraceae ], 14­v­2005, M. Masumoto. 11 females, same host and locality as holotype, 13­v­2002, S. Masumoto.

The holotype and most paratypes are deposited in TUA, Atsugi , Japan .

Comments. This species can be distinguished easily from other members by a combination of the following character states: 7­segmented antenna; abdominal terga with numerous ciliate microtrichia, tergum II with three lateral setae, sterna without discal setae. It is appears to be closely related to M. japonicus and M. salicis although antennal segment VI of males is often without microtrichia on the ventral surface, and the hypomere is almost not dilated at apex.

Etymology. In reference to the name of Masumoto’s wife, Shiho, who collected and supported the research of this species.