Bactrothrips elongatus, Dang, Lihong & Qiao, Gexia, 2012

Dang, Lihong & Qiao, Gexia, 2012, The genus Bactrothrips in China (Thysanoptera: Idolothripinae): morphological and molecular data, and a key with two new species, Zootaxa 3449, pp. 47-61 : 51-52

Bactrothrips elongatus n. sp.

( Figs 1–14 , 36 , 42 )

Male macroptera. Body uniformly brown; antennal segments I–II brown, III–VI yellow but shaded in their clubheads, VII–VIII brown; fore wings uniformly pale; femora and tibiae brown with pale extreme bases and apices, tarsi yellow; abdominal tubercles on segment VI yellow but dark brown in basal 0.3, tubercles on VIII dark brown, tube dark brown; major setae yellowish.

Head 2.1 times as long as wide across eyes, projecting in front of eyes, transversely striate; interocellar setae well developed, longer than width of one eye, one pair of postocellar setae about as long as diameter of posterior ocellus; eyes developed, about 0.3 of head length, postocular cheek setae shorter than postocular setae; mid-dorsal setae well developed, about as long as or a little longer than interocellar setae; cheeks with several pairs of minor setae ( Figs 2 , 9 ). Maxillary stylets wide apart, retracted into head one third way to posterior margin of eyes ( Fig. 2 ). Antennal segment III a little longer than head width across eyes ( Fig. 9 ), III with 2 sensoria, IV with 4, V with 2, VI and VII each with one, these sensoria on III about 2.5 times as long as apical width of segment, much longer than 0.3 times of this segment, segments VI–VII with a short apical, ventral prolongation.

Pronotum with irregular sculpture, anterior margin concave, epimeral sutures incomplete; one pair of am a little shorter than aa, epima much longer than half of epim ( Figs 3 , 10 ). Metanotal median setae developed, metanotum smooth on anterior third, with weak reticulate sculpture on posterior half ( Figs 4 , 11 ). Fore wings broad, with about 33 duplicated cilia ( Fig. 5 ).

Pelta with reticulate sculpture slightly longitudinal, lateral lobes narrowly joined to median lobe ( Figs 6 , 11 ); lateral abdominal tubercles on VI well developed and straight, about 1.4 times as long as length of the segment, VII without lateral tubercles, VIII with one pair of short tubercles ( Figs 8 , 42 ); tergite IX setae much shorter than tube; tube about 1.4 times as long as head, weakly constricted near apex, laterally with few long setae. Sternites with an irregular single or double transverse row of discal setae no pore plates.

Measurements (holotype male in microns). Body length 4901. Head, length 563; width across eyes 271; head setae length: interocellars 111, postocellars 31, postoculars 72, postocular cheek setae 46, mid-dorsal setae 120; diameter of posterior ocellus 33. Antennal segments III–VIII length (maximum width), 285 (44), 237 (46), 221 (45), 151 (38), 85 (27), 77 (14), sensoria of segment III length 136. Pronotum length (maximum width) 237 (407); setae length, am 56, aa 65, ml 91, epim 147, epima 93, pa 108, pm 37. Metanotum median setae length 142. Pelta length (maximum width) 122 (501). Tubercles on tergite VI length 394, little tubercles on VIII length 36; tergite IX setae S1 263, S2 124; tube length 773.

Female macroptera. Similar to male, but larger, without tubercles on abdominal segments VI–VIII, tergite IX with setae S1 and S2 similar in length.

Measurements (paratype female in microns). Body length 6282. Head, length 625; width across eyes 303; head setae length: interocellars 111, postocellars 36, postoculars 61, postocular cheek setae 50, mid-dorsal setae 108, diameter of posterior ocellus 33. Antennal segments III–VIII length (maximum width), 329 (50), 278 (52), 258 (48), 177 (40), 87 (34), 86 (17), sensoria of segment III length 153. Pronotum length (maximum width) 267 (463); setae length, am 68, aa 71, ml 111, epim 153, epima 91, pa 112, pm 24. Metanotal median setae length 201. Pelta length (maximum width) 150 (603). Tergite IX setae S1 341, S2 324; tube length 1029.

Material examined. Holotype male. CHINA, Guangxi Auto. Reg. (Xingan County, Maoer Mountain, 25.53°N, 110.25°E, altitude 1357m), on dried-up hanging tree leaves, 3.vi.2011, L.H. Dang, No. JM11119-3. Paratypes: Guangxi Auto. Reg. (Huaping County, 25.39°N, 109.55°E), 2 females on dried-up hanging tree leaves, 8.vi.2011, L.H. Dang, Nos. JM11159-2, JM11159-3; Guangxi Auto. Reg. (Wuming County, Daming Mountain, 23.27°N, 108.30°E), 1 female 1 male on dried-up hanging tree leaves, 28–30.v.2011, L.H. Dang, Nos. JM10068-1, JM11082-2.

Remark. This species is somewhat similar to B. honoris Bagnall in appearance, with the sense-cones on antennal segment III well developed, much longer than one third of this segment, and interocellar setae similar to mid-dorsal setae. But the new species can be distinguished by the following characters: sense-cones on antennal segment III obviously shorter than half of this segment ( honoris : sense-cones on antennal segment III as long as half of this segment), epima much longer than half of epim ( honoris : epima a little shorter than half of epim), and all tibiae uniformly dark brown not bicoloured ( honoris : hind tibiae obviously bicoloured with apical third or half yellow).

Etymology. This species name is composed of one Latin word, “ elongatus (= long)”, based on longer sensecones on antennal segments.

Figures

FIGURES 1 – 8. Bactrothrips elongatus n. sp. Female: 1, antenna; 2, dorsal view of head; 3, dorsal view of pronotum; 4, dorsal view of mesonotum and metanotum; 5, fore wing; 6, pelta; 7, abdominal tergite IX and tube. Male: 8, abdominal tergites VI – VIII showing the lateral tubercles. Scale bars = 100 μm.

FIGURES 9 – 14. Bactrothrips elongatus n. sp. Female: 9, antenna, head, pronotum and fore legs; 10, dorsal view of pronotum; 11, dorsal view of mesonotum and metanotum; 12, hind leg; 13, abdominal tergite IX and tube. Male: 14, abdominal tergite IX and tube. Scale bars = 100 μm.

FIGURES 31 – 37. Bactrothrips spp. Dorsal view of head: 31, B. brevitubus; 32, B. flectoventris; 33, B. honoris; 34, B. pictipes; 35, B. quadrituberculatus; 36, B. elongatus n. sp.; 37, B. furvescrus n. sp. Scale bars = 100 μm.

FIGURES 38 – 43. Bactrothrips spp. Abdominal tergites VI – VIII showing the lateral tubercles: 38 & 39, B. brevitubus; 40, B. flectoventris; 41, B. quadrituberculatus; 42, B. elongatus n. sp.; 43, B. furvescrus n. sp. Scale bars = 100 μm.