Okajimaella nonakai, Masumoto, Masami & Okajima, Shûji, 2012

Masumoto, Masami & Okajima, Shûji, 2012, Trichromothrips genus-group (Thysanoptera, Thripidae) from Vietnam, with descriptions of new species in both Okajimaella and Paithrips, Zootaxa 3313, pp. 1-11 : 4

Okajimaella nonakai sp. n.

( Figs. 1 A, 2AC, 3A-D & 4A)

Female macroptea. Distended body length 1.5–1.6 mm. Body indistinctly bicoloured; head pale brown with ocellar triangle and in front of fore ocellus dark; antennal segments I brown, II brown with distal third yellowish, III–IV yellow, V yellowish brown with distal third slightly dark, VI–VIII brown; pronotum to metanotum brownish yellow, darker at mesonotum and metascutum; abdomen yellowish brown to brown, gradually darkened toward segment X; fore wings shaded with basal fourth slightly pale, scale shaded; all legs brownish yellow; prominent body setae pale.

Head ( Fig. 1 A) 0.8 times as long as wide, slightly sculptured with transverse striae on basal third of dorsal surface laterally, smooth medially; ocellar setae II much longer than setae III, almost reaching posterior margin of hind ocelli. Antennal segment VI ( Fig. 2 A) usually the longest, often subequal length to IV or V. Antennal segments I– VIII ratio length/width as follows: 0.8–0.9, 1.0–1.1, 1.8–2.1, 2.1–2.3, 2.3–2.6, 2.6–3.5, 1.3–1.7, 3.0–4.0.

Pronotum ( Fig. 1 A) 0.8 times as long as wide, with 20–25 discal setae; three pairs of anteromarginal setae much longer than discal setae, S2 setae the longest and 0.4–0.6 times as long as pronotal median length; posteroangular setae I (=inner pair) 0.4–0.6 times as long as pronotal median length and slightly longer than setae II; posteromarginal setae I the longest, about 3 times as long as other setae, 0.4–0.6 times as long as pronotal median length. Mesonotum ( Fig. 2 C) without campaniform sensilla anteromedially. Fore wings costal vein with 22–26 setae, second vein with 14 setae; clavus with 4 veinal and one discal setae. Fore tibiae ( Fig. 3 A) each with a small apical claw on inner surface.

Abdominal tergites II–VIII ( Figs. 3 B, 4A) sculptured with anastomosing striae laterally and a few striae at anterior half between S2 setae; tergites VI–VIII with S4 setae minute; tergite IX without SS2 setae ( Fig. 4 A). Ovipositor 1.1–1.2 times as long as pronotal median length.

Measurements (holotype female in microns). Distended body length 1575. Head length 100, across cheeks 120; compound eyes dorsal length (width) 65 (43); ocellar setae II length 55; ocellar setae III length (interval) 38 (3). Pronotum median length (width) 138 (170); anteromarginal setae I length 39, setae II length 66; posteroangular setae I length 70, setae II length 66; posteromarginal setae I length 60. Metascutum median length 65; median setae length 35. Fore wings 785. Ovipositor 150. Antennal segments I to VII length (width) as followings: 28 (30), 30 (28), 43 (23), 45 (20), 45 (18), 45 (18), 13 (8), 20 (5).

Male macroptera. General structure very similar to female, but slightly paler. Abdominal tergite IX with S1 setae at posterior margin, S2 setae near posterior margin and slightly longer than S1 setae; drepanae slender ( Fig. 3 C). Abdominal sternites III–VIII with 8–12 pore plates ( Fig. 3 D).

Measurements (paratype male in microns). Distended body length 1370. Head length 98, across cheeks 108; compound eyes dorsal length (width) 58 (35); ocellar setae II length 58; ocellar setae III length (interval) 35 (3). Pronotum median length (width) 113 (165); anteromarginal setae I length 65, setae II length 63; posteroangular setae I length 66, setae II length 56; posteroangular setae I length 68. Metascutum median length 63; median setae length 25. Fore wings 610. Antennal segments I to VII length (width) as followings: 25 (28), 28 (25), 38 (23), 38 (20), 35 (18), 50 (18), 10 (8), 15 (5).

Type series. Holotype female, Vietnam, Lam Dong Province, Bao Loc, Dam Bri, on bamboo, 26-xii-2001, S. Okajima. Paratypes: 2 females and 1 male, same data as holotype. 1 female, same place and plant as holotype, 27.xii.2001, S. Okajima.

Comments. This species is very similar to O. tubercula , but the pronotum has much longer median posteromarginal setae, and there is a small tibial tubercle.

Etymology. Dedicated to one of the authors of this genus, Dr. Toshifumi Nonaka.

Figures

FIGURE 1. Head & pronotum, female: (A) Okajimaella nonakai; (B) Paithrips pornthipae.

FIGURE 2. Female. A-B, antennae, right: (A) Okajimaella nonakai; (B) Paithrips pornthipae. C-D, meso- and metanota: (C) Okajimaella nonakai; (D) Paithrips pornthipae.

FIGURE 3. Okajimaella nonakai, A-B, female: (A) Fore tibia and tarsus, right; (B) Abdominal tergite V, right side. C-D, male: (C) Abdominal tergite IX; (D) Abdominal sternites VII-VIII.

FIGURE 4. Abdominal tergites VIII-X, female: (A) Okajimaella nonakai; (B) Paithrips pornthipae.