Trachynotothrips striatus

Okajima, Masami Masumoto And Shûji, 2005, A remarkable new genus of Thripinae (Thysanoptera, Thripidae) with enlarged metathoracic furca, from Southeast Asia, Zootaxa 1048, pp. 53-64 : 59-63

Trachynotothrips striatus gen. et sp. nov.

Description. Female. Macropterous. Distended body length 1.1mm. Body generally pale with brown markings. Head pale with cheeks and between antennae shaded, ventral surface shaded with anterior transverse pale band on frons; antennal segments I and III yellowish white, segments II and VI to VIII brown, segment IV yellowish white with distal half brown, segment V yellowish white with distal third brown. Pronotum yellowish white with two submarginal longitudinal brown bands. Mesonotum yellowish white, shaded anterolaterally. Metanotum pale brown. Metapreepisternum, metaepisternum, metaepimeron pale brown. Fore wings with alternate four white areas and three brown bands, base and apex pale, brown band near base paler than other bands; scale shaded at apex. Fore femora slightly shaded with apex pale, mid­ and hind femora pale brown with apex pale; fore and mid tibia pale brown with base pale, hind tibia pale with middle pale brown; all tibiae pale. Abdominal segments yellowish white to yellowish brown with brown along anterior margin of tergum II and VIII, along anterior margin and each side of tergum III to VII, along each side of sterna III to VII and on laterotergites. Prominent body setae shaded.

Head 0.6 times as long as wide; dorsal surface with irregular reticulation lacking internal wrinkle in front of fore ocellus and with a line of sculpture on postocular area ( Fig. 8 ). Ocellar setae III situated between hind ocelli, 4.7 times as long as distance between their bases. Postocular setae minute. Compound eyes with stout lanceolate setae. Antennal segments III to VI with some microtrichial rows on both dorsal and ventral surfaces; segment II without microtrichial row; segment III small, widest at middle; segment IV widest at middle, tapering at distal half; segment VI the longest, tapering at distal twothirds like neck, with inner sense­cone exceeding middle of segment VIII and a ventral apical sense­cone exceeding apex of segment VIII ( Fig. 9 ). Length/Width of antennal segments I to VIII as follows: 1.0, 1.2, 1.9, 3.1, 2.3, 2.4, 1.3, 4.0.

Pronotum 1.9 times as long as wide, with 17 slightly stout discal setae; posteroangular setae I 0.6 times as long as pronotal median length and 0.9 times setae II ( Fig. 8 ). Mesonotum sculptured with transverse striae on posterior half; campaniform sensilla absent anteromedially; median pair of setae situated near posterior margin ( Fig. 10 ). Metascutum sculptured longitudinally at middle, with median pair of setae 0.3 times as long as metascutal median length ( Fig.10 ). Fore wing first vein with 5 basal setae; costal vein with 21 (left) and 22 (right) setae; second vein with 9 setae.

Abdominal terga II to VII sculptured with outside of B2 setae, smooth between each B2 setae, with small microtrichia along posterior margin behind sculptured area ( Fig. 12 ); terga III to VIII with five pairs of setae; terga IV to VII also with a few microtrichia at middle of posterior margin ( Fig. 13 ); tergum VIII with B4 setae minute; tergum IX with B1 setae subequal to mid­dorsal setae, 0.5 times as long as tergum IX median length, 0.8 times as long as B2 setae ( Fig. 13 ). Ovipositor 2.7 times as long as pronotal median length.

Measurements (in m). Holotype (female). Distended body length 1110. Head length 78, width across cheeks 128; compound eye dorsal length 73, width 40; ocellar setae III length 35, distance between their bases 8. Pronotal median length 85, width 158; posteromarginal setae I length 52, setae II length 58; metascutal median length 73, median setae length 23; fore wing length 338. Abdominal tergum IX length 88, B1 setae length 43, B2 setae length 53, mid­dorsal setae length 40. Ovipositor length 230. Antennal segments I to VIII length (width) as follows: 23(23), 30(25), 38(20), 50(16), 35(15), 43(15), 10(8), 20(5).

Male. General colour and structure as in female, but slightly smaller. Abdominal terga without spine­like setae (cf. Fig. 12 ); tergum IX without microtrichia on posterior margin between drepanae ( Fig. 15 ); sternum VIII with three pairs of major setae and five small setae on posterior margin, and with four discal setae ( Fig. 14 ).

Measurements (in m). paratype (male). Distended body length 1,035. Head length 65, width across cheeks 115; compound eye dorsal length 55, width 38; ocellar setae III length 29, distance between their bases 8. Pronotal median length 80, width 140; posteromarginal setae I length 45, setae II length 57; metascutal median length 65, median setae length 23; fore wing length 310. Antennal segments I to VIII length (width) as follows: 23(20), 28(23), 35(18), 43(18), 30(15), 45(13), 8(5), 18(3).

Type series. Holotype female and paratype male. SOUTH VIETNAM, Lam Dong Province Da Lat, Ward 5 Van Thanh, host unknown, 23­xii­2001, S. Okajima. The types are deposited in Laboratory of Insect Resources, Faculty of Agriculture, Tokyo University of Agriculture, Atsugi, Kanagawa Pref., Japan.

Etymology. In reference to the striated body of the species.

Figures

FIGURES 8 – 10. Trachynotothrips striatus gen. et sp. n. (female). (8) Head & Pronotum; (9) Antenna (right); (10) Meso­ and metanota (sculpture omitted at metascutellum). Scale bar = 0.04 mm.

FIGURES 11 – 13. Trachynotothrips striatus gen. et sp. n. (female). (11) Meso­ and metasterna; (12) Abdominal tergum and laterotergite V (right side); (13): Abdominal terga VIII – XI (sculpture omitted on tergum IX). MD = mid­dorsal setae. Scale bar = 0.04 mm.

FIGURES 14 – 15. Trachynotothrips striatus gen. et sp. n. (male). Abdominal segments. (14) sterna VII – VIII; (15) tergum IX (sculpture omitted). Scale bar = 0.04 mm.