Thrips coxalis, Masumoto & Tsutsumi & Okajima, 2023

Masumoto, Masami, Tsutsumi, Tadaaki & Okajima, Shûji, 2023, Two new species of the genus Thrips Linnaeus (Thysanoptera, Thripidae) in Japan with a revised key to Japanese species of Thrips, Zootaxa 5239 (3), pp. 358-372 : 363-365

Thrips coxalis sp. n.

( Figs 2–3, 8 , 11–19 )

Female macroptera . Distended body length 1.2–1.4 mm. Body uniformly yellow ( Fig. 2 ); antennal segments I–II yellow, III shaded, IV–V pale brown with basal half pale, VI–VII brown; fore wings pale or slightly shaded ( Fig. 8 ); all legs yellow; major body setae pale brown, abdominal tergites II–IV with S2 setae paler than lateral marginal setae. Head 0.8–0.9 times as long as broad, sculptured with transverse anastomosing striae dorsally, rounded at cheeks ( Fig. 11 ). Ocellar setae pair I absent, II much shorter than pair III, III situated lateral to or posterolateral to fore ocellus and slightly longer than diameter of hind ocelli. Postocular setae arranged in a line, S1 setae slightly shorter than ocellar setae pair III, S2 and S4 setae much shorter than S1 and S3 setae. Antennae 7-segmented, segment II with microtrichia, III and IV with forked sense-cones, rounded at each side and with short apical neck, IV–V pedicelate, VI gently tapered at distal third and not pedicelate, with 11 setae, III and VI subequal length and longest ( Fig 12a ). Ratio length/broad of segments I–VII as follows: 0.9–1.0, 1.3–1.6, 2.1–2.3, 2.0–2.5, 1.8–2.1, 2.4–2.7, 2.0. Pronotum 0.7–0.8 times as long as broad, sculptured with wide spaced transverse anastomosing striae, with 28–33 (mean 30, S.D. 1.8, n=10) discal setae; posteroangular setae 2 pairs, pair I (=inner pair) 0.4–0.5 times as long as median pronotal length, 1.1–1.3 times as long as pair II (=outer pair); posteromarginal setae 3 pairs, S1 setae longest. Mesonotum with paired CPS anteromedially, weak or no sculpture around anteromedian CPS. Metascutum sculptured longitudinally except anteromedially, posteromedian sculpture anastomosing lines and usually convergent to middle at posterior margin; median pair of setae closer to each other than to submedian setae and much behind anterior margin, 0.4–0.5 times as long as metascutal median length; paired (rarely single) CPS present ( Fig. 13 ). Fore wing costal vein with 21–27 setae, first vein with 7 basal (rarely 8) and 3 distal setae, second vein with 10–13 setae; clavus with 5 veinal and 1 discal setae. Hind coxa with several distinct microtrichia on inner dorsal surface ( Fig. 14 ). Abdominal tergites V–VIII with paired ctenidia, ctenidia situated mesad of spiracles on VIII ( Fig. 16 ); tergite II with 4 lateral marginal setae ( Fig. 15 ); tergites II–VII with a line of sculpture across tergites anterior to S1 setae, but smooth between S1 setae; tergite VIII with posteromarginal comb complete, S1 setae subequal length to or slightly shorter than S2 setae; tergite IX with 2 pairs of CPS; tergite X with median split almost complete; sternites without discal setae; sternite I with 1 or 2 microsetae anteromedially; sternites III–VII with 3 pairs posteromarginal setae, II with 2 pairs; sternite VII with S1 setae much in front of posterior margin; pleurotergites with small fine microtrichia and no discal setae ( Fig. 17 ). Ovipositor 1.7–1.9 times as long as pronotal median length.

Measurements (holotype female in microns). Distended body length 1250. Head median length 103, width across cheeks 98, compound eye dorsal length 55, width 38. Pronotum median length 113, width 155: posteroangular setae pair I length 49–50, pair II length 43–45, posteromarginal S1 setae length 18–19. Metascutal median length 65: median pair of setae length 28. Fore wing length 620, width at middle 45. Abdominal tergite IX length 63, tergite X length 51. Ovipositor length 195. Antennal segments I–VII length (width) as follows: 23 (26), 38 (24), 43 (20), 43 (20), 35 (18), 48 (18), 15 (8).

Male macroptera . Body colour and structure very similar to female but smaller ( Fig. 3 ). Antennal segment VI with 11 setae. Abdominal tergite VIII with posteromarginal comb weakly developed, but microtrichia often fine and long medially; tergite IX with S1 setae slightly shorter than or subequal in length to S2 setae, almost equidistance to S2 setae and arranged transversely, usually 2 pairs of (rarely 3) CPS ( Fig. 18 ); sternites III–VII with transverse pore plates not constricted medially and smaller on posterior segments, almost as broad as interval between S1 setae ( Fig. 19 ).

Measurements (male paratypes in microns). Distended body length 950–1080. Head median length 81–87, width across cheeks 110–118, compound eye dorsal length 45–50, width 33–35. Pronotum median length 98–110, width 128–138: posteroangular setae pair I length 38–49, pair II length 38–43, posteromarginal S1 setae length 16–21. Metascutal median length 55–60: median pair of setae length 25–30. Fore wing length 510–570, width at middle 35–40. Abdominal sternites III–VII pore plates width as follows: 43–50, 45–50, 40–48, 38–45, 30–43. Antennal segments I–VII length (width) as follows: 20–25 (23–24), 31–33 (23), 39–44 (18–19), 38–40 (18), 28–33 (16–18), 36–43 (15–18), 13–15 (6–8).

Type series. Holotype female, Japan, Honshu, Kanagawa-ken, Yokohama-shi, nr. Mt. Takatori-yama , on young leaf of Lespedeza buergeri [ Fabaceae ], 8.v.2015, M.Masumoto . Paratypes: 4 females & 2 males collected together with holotype. 6 females & 1 male, same plant and place with holotype, 15.v.2022. 4 females & 2 males, same plant and place with holotype, 28.v.2022. Yamanashi-ken, Hokuto-shi, Kanayama (alt. about 1450m): 3 females on leaf of Miscanthus sinensis [ Poaceae ], 23.vii.2022. 3 females on flower of Lespedeza sp. , 23.viii.2022. (all collected by M.Masumoto). The holotype and most paratypes are deposited in TUA.

Non-paratypic specimens. Honshu: Gunma-ken, Katashina-mura (alt. 1500m), 1 female on flower of Lespedeza sp. , 24.viii.2014, M.Masumoto ( TUA). Tokyo, Koto-ku, Aomi, 1 female on flower of Farfugium japonicum [ Asteraceae ], 7.xi.2014, M.Masumoto ( TUA). Kanagawa-ken, Mt. Tanzawa, nr. Houkizawa (alt. 800m), 2 females on grass, 18.vi.1987, S.Okajima ( TUA). Kyushu: Fukuoka-ken, Fukuoka-shi, Johnan-ku, Mt. Aburayama, 1 female on leaf of Quercus glauca [ Fagaceae ], 30.x.1994, S.Okajima ( TUA). Kagoshima-ken, Ohshima-gun, Okinoerabu-jima Is., Wadomari-cho, 3 females on flower of Chrysanthemum sp. [ Asteraceae ], iv.1999 (collector unknown) ( TUA).

Comments. This new species is distributed from low-lands to mountainous places. When it is collected from mountainous areas, it may be confused with T. alni . However, it is distinguishable from the latter species by pronotum with shorter discal setaethan in alni ( Fig. 28 ), pale fore wings ( Figs 7, 8 ), and same number of setae on antennal segment VI in both sexes, in addition to above key. In T. alni , setal number on male antennal segment VI is more than that of female, 12 in female and more than 15 in male. Moreover, T. alni is associated with Betulaceae but this new species is not associated with Betulaceae and is collected from Lespedeza and other plants.

Figures

FIGURES 1–10. Thrips species. (1) T. alni, female. T. coxalis sp. n. 2–3: (2) female; (3) male. (4) T. palmi, female. T. spiranthicola sp. n. 5–6: (5) female; (6) male. Fore wing, female 7–10: (7) T. alni; (8) T. coxalis sp. n.; (9) T. palmi; (10) T. spiranthicola sp. n.

FIGURES 11–19. Thrips coxalis sp. n. (11) head & pronotum, female. Antenna 12a–b: (12a) segments I–VII, female; (12b) segments VI-VII, male. (13) mesonotum & metascutum, female; (14) hind coxa to femur, female; (15) tergite II, female; (16) tergites VIII–X, female; (17) pleurotergite IV (left), female. Male 18–19: (18) tergites VIII–IX; (19) sternites V–VI.

FIGURES 28–33. Thrips species, female. Head 28– 29: (28) T. alni; (29) T. palmi. Mesonotum & metascutum 30–31: (30) T. alni; (31) T. palmi. Hind coxa to femur 32–33: (32) T. alni; (33) T. palmi.