Anascirtothrips okinawanus, Masumoto, Masami & Okajima, Shûji, 2007

Masumoto, Masami & Okajima, Shûji, 2007, The genus Scirtothrips Shull (Insecta, Thysanoptera, Thripidae) and three related genera in Japan, Zootaxa 1552, pp. 1-33 : 6-10

Anascirtothrips okinawanus n. sp.

( Figs. 1–3 )

Female. Distended body length 1.0– 1.1 mm. Body generally yellow or brownish yellow, pronotum with pale brown markings, abdominal terga II to VI with pale brown markings at each side, sterna III to VII dark at antecostal ridge; antennal segments I to II pale, III to V pale brown with basal half pale, VI brown with basal fourth pale, VII brown; fore wings pale with three shaded areas, at basal, subbasal and subdistal areas, clavus shaded; all legs yellow; prominent body setae pale.

Head 1.6–2.0 times as wide as long, sculptured with transverse striae dorsally. Ocellar setae III situated at margin of ocellar triangle ( Fig. 1 A). Antennal segments III to V subequal in length, VI the longest ( Fig. 1 B). Antennal segments I to VII length/width ratio as follows: 0.9, 1.1–1.4, 1.5–1.8, 1.7–1.9, 1.7–1.9, 2.3–2.7, 2.5– 3.0.

Pronotum 1.4–1.5 times as wide as long, with about 40 setae including marginal setae (23 setae at middle in the holotype) ( Fig. 1 A). Metascutum sculptured with transverse striae ( Fig. 1 C). Fore wings costal vein with 20–24 setae (22 on left, 24 on right in the holotype). Mesosternal endofurca without spinula ( Fig. 2 A).

Abdominal terga II to VIII with about seven transverse lines of sculpture having ciliate microtrichia, lines not extending mesad of B2 setae at II to VII, a few lines of sculpture extend to B1 setae level posteriorly at VIII, microtrichia small, much shorter than space between lines of sculpture ( Fig. 2 B); terga II to VII with microtrichia along posterior margin outside of B2 setae ( Fig. 2 B); tergum IX with some microtrichial rows at posterior half ( Fig. 2 B), B1, B2 and B3 each 0.6–0.7 times, 0.8–0.9 times and 0.7–0.8 times as long as median length of the tergum; tergum X without microtrichia ( Fig. 2 B), B1 setae and B2 setae each 0.9–1.4 times and 0.9–1.0 times as long as median length of the tergum; sterna II to VII with ciliate microtrichia arising from lines of sculpture at each side and a transverse line of sculpture having microtrichia across the terga along posterior margin, posteromarginal microtrichia more (or less) than 0.5 times as long as posteromarginal setae ( Fig. 3 A). Ovipositor 1.5 times as long as pronotal median length.

Measurements of holotype female in microns. Distended body length 1100. Head length 65, width across cheeks 118; compound dorsal length 53, width 33. Pronotal median length 113, width 158. Metascutal median length 58, median setae length 18. Fore wings length 530, width at middle 30. Abdominal tergum IX median length 65; B1 setae length 45–48, B2 setae length 55, B3 setae length 53, mid-dorsal setae length 33; tergum X median length 38, B1 setae I length 52–54, B2 setae length?. Ovipositor length 165. Antennal segments I to VIII length (width) as follows: 20 (23), 33 (24), 35 (20), 33 (18), 33 (18), 40 (15), 23 (8).

Male. Distended body length 0.7–0.8 mm. Body colour same as female. Abdominal tergum IX elongate at each side posteriorly ( Fig. 3 B).

Measurements of paratype males in microns. Distended body length 700–810. Head length 50–55, width across cheeks 98–100; compound dorsal length 43–45, width 30–33. Pronotal median length 90–93, width 128–135. Metascutal median length 48–50. Fore wings length 360–420, width at middle 25–30. Antennal segments I to VIII length (width) as follows: 18 (20), 25 (21–23), 28–30 (18), 25–28 (15), 28–30 (15), 33–35 (14–16), 15–20 (6).

Type series. Holotype female: Japan, Okinawa Pref., Ishigaki-jima Is., Takeda-rindou, on leaves of Fraxinus griffithii [ Oleaceae ], 18-i-1991, S. Okajima. Paratypes: 3 females, 1 male, Okinawa Pref., Ishigakijima Is., nr. Nagura, Takeda, on leaves of Ficus erecta [ Moraceae ], 11-i-1991, S. Okajima. 2 females and 2 males, Okinawa Pref., Okinawa-hontou Is., Urazoe City, Iso-kouen park, on leaves of Ficus erecta , 7-viii- 2004, K. Minoura. The holotype and most paratypes are deposited in Laboratory of Entomology, TUA, Atsugi, Japan.

Non-paratypic specimens. 9 females, Japan, Okinawa Pref., Yonaguni-jima Is., Mantabaru-rindou, on Moraceae ?, 5-iv-1999, T. Tsutsumi (FU).

Etymology. In reference to the locality of the species.

Comments. The four species in this genus are very similar to each other and they are relatively weakly distinguished. This species is most similar to A. arafura in coloration, but it can be distinguished by following character states: clavus of fore wings distinctly shaded (clavus pale in arafura ). Moreover, in A. arafura , the mouth-cone appears to be slender and pointed at the apex more than in the other species. In contrast, the male of this new species can be distinguished from A. discordiae by having abdominal tergum IX with each side elongate posteriorly (not elongated in A. discordiae ). According to Mound & Wang (2000), the male of A. arorai has abdominal tergum IX with B1 setae situated on the line joining each B2 seta, whereas the B1 setae are distinctly posterior to the line joining each B2 seta in this new species.

Figures

FIGURE 1. Anascirtothrips okinawanus n. sp. (female). (A) Head & pronotum; (B) Antenna (left); (C) Mesonotum & metascutum.

FIGURE 2. Anascirtothrips okinawanus n. sp. (female). (A) Ventral aspect of thorax; (B) Abdominal terga VII – X (microtrichial row omitted on right side of terga VII – VIII).

FIGURE 3. Anascirtothrips okinawanus n. sp. (A) Abdominal sterna VI – VII (female); (B) Abdominal terga XI – X (male).