Thrips unisetifer, Masumoto & Okajima, 2019

Masumoto, Masami & Okajima, Shûji, 2019, Three new species of the genus Thrips (Thysanoptera, Thripidae) in Japan, Zootaxa 4614 (3), pp. 575-584 : 579-583

Thrips unisetifer sp. n.

( Figs 4, 5, 8 , 11, 14, 20, 23 , 25, 27 )

Female macroptera . Body uniformly yellow ( Fig 4 ); antennal segments I–IV yellow, V yellow with apex slightly shaded, VI–VII brown ( Fig 11 ); fore wings including clavus uniformly pale; all legs yellow; major setae brown ( Fig. 14 ). Head about 0.8 times as long as wide, sculptured with transverse anastomosing striae dorsally, weekly sculp- tured within ocellar triangle, rounded at cheeks ( Fig. 8 ). Ocellar setae III situated lateral to fore ocellus and longer than diameter of ocellus. Postocular setae arranged in a line, setae I slightly shorter than ocellar setae III, setae II and IV much shorter than setae I and II. Antennae 7-segmented, segment II with microtrichia, III and IV without apical neck, V pedicelate, VI gradually rounded at each side and not pedicelate. Ratio length/width of segments I–VII as follows: 0.9, 1.1–1.3, 2.3–2.4, 2.4–2.6, 1.9–2.2, 2.6, 2.0–2.3. Pronotum 0.7–0.8 times as long as width, sculptured with transversely anastomosing striae, with about 30 discal setae; posteromarginal setae 1 pair, 0.3–0.4 times as long as pronotal median length; posteromarginal setae 3 pairs, all subequal length. Mesonotum with paired CPS anteromedially. Metascutum transversely reticulate anteromedially, longitudinally reticulate except anteromedially; median pair of setae slightly behind anterior margin, about 0.5 times as long as metascutal median length; paired or only 1 CPS usually present, sometime absent (1 CPS in holotype). Fore wing costal vein with 26–30 setae, first vein with 7 basal and 3 (rarely 2) distal setae, second vein with 14–17 setae; clavus with 5 veinal and 1 discal setae. Abdominal tergite II with four lateral marginal setae, arranged in a line; tergites II–VII with a line of sculpture across tergites anterior to S1 setae, and a few lines extending mesad of S1 setae; tergite VIII with posteromarginal comb complete ( Fig. 20 ); tergite IX with 2 pairs of CPS; tergite X with median split almost complete; sternite I without microsetae; sternites III–VII with about 15 discal setae arranged transverse line and 3 pairs of posteromarginal setae, but II with 1–4 discal and 2 pairs of posteromarginal setae; sternite VII with S1 setae arising from posterior margin ( Fig. 23 ); pleurotergites without discal setae and microtrichia. Ovipositor about 2.0 times as long as pronotal median length.

Measurements of holotype female in microns. Body length 1500. Head length 113, width across cheeks 133; compound eye dorsal length 73, width 43. Pronotal median length 115, width 154; posteroangular setae I (outer setae) length 40–42. Metascutal median length 69; median pair of setae length 33–38. Fore wing length 660, width at middle 50. Abdominal tergite IX length 70, tergite X length 54. Ovipositor length 230. Antennal segments I–VII length (width) as follows: 25 (28), 27 (25), 40 (18), 43 (18), 35 (16), 45 (18), 15 (8).

Male macroptera . Body colour and structure very similar to female but smaller ( Fig. 5 ). Abdominal tergite IX with S1 and S2 setae subequal length and equidistance, arranged transversely ( Fig 25 ); sternites III–VII transverse pore plates, slightly narrow medially, 48–60 μm width ( Fig. 27 ).

Measurements of paratype male in microns. Body length 1100. Head length 93, width across cheeks 115; compound eye dorsal length 57, width 35. Pronotal median length 105, width 135; posteroangular setae I (outer setae) length 39–42. Metascutal median length 60; median pair of setae length 20–25. Fore wing length 530, width at middle 35. Antennal segments I–VII length (width) as follows: 23 (25), 33 (23), 43 (18), 39 (16), 30 (16), 39 (16), 16 (8).

Type series. Holotype female, JAPAN, Ogasawara Islands, Chichi-jima, Seihyoukaigan, on leaf and branch of Scaevola traccada [ Goodeniaceae ], 13.i.2013, T. Sugimoto . Paratypes: 6 females & 1 male collected together with holotype. Same place and plants as holotype: 1 male, 26.i.2013. 6 females, 6.ii.2013. 26 females & 6 males, 2.iii.2013. all T. Sugimoto .

Comments. This species shares only with T. unispinus Moulton , a species distributed in the Oriental to Australian regions ( Mound & Masumoto 2005), the presence of a single pair of pronotal posteroangular setae. However, this new species can be distinguished by ocellar setae III lateral to the fore ocellus, and abdominal tergite VIII with posteromarginal comb complete, whereas in T. unispinus ocellar setae III are just behind the fore ocellus, and tergite VIII is without a posteromarginal comb medially.

Etymology. In reference to pronotal chaetotaxy.

Figures

FIGURES 1–8. Thrips species. T. rhamni sp. n., 1–2. (1) Female; (2) Male. (3) T. shiranensis, sp. n., female. T. unisetifer, sp. n., 4–5. (4) Female; (5) Male. Head to metanotum, 6–8. (6) T. rhamni, female.; (7) T. shiranensis, female; (8) T. unisetifer, female.

FIGURES 9–23. Thrips species, female. Antenna, 9–11. (9) T. rhamni; (10) T. shiranensis; (11) T. unisetifer. Fore wing, 12–14. (12) T. rhamni; (13) T. shiranensis; (14) T. unisetifer. Abdominal tergites, 15–20. (15) T. rhamni, tergite II; (16) T. shiranensis, tergites II–III (ac=accessary seta); (17) T. shiranensis, tergites V–VI; (18) T. rhamni, tergites VIII–X; (19) T. shiranensis, tergites VII–X; (20) T. unisetifer, tergites VII–X. Abdominal sternites, 21–23. (21) T. rhamni, sternite VII; (22) T. shiranensis, sternites VI–VII; (23) T. unisetifer, sternites VI–VII.

FIGURES 24–27. Thrips species, male. Abdominal tergites VIII–IX. (24) T. rhamni; (25) T. unisetifer. Abdominal sternites VI–VII, 26-27. (26) T. rhamni; (27) T. unisetifer.