Dendrothrips octosparsus, Wang & Mound & Tong, 2019

Wang, Zhaohong, Mound, Laurence A. & Tong, Xiaoli, 2019, Character state variation within Dendrothrips (Thysanoptera: Thripidae) with a revision of the species from China, Zootaxa 4590 (2), pp. 231-248 : 244-246

Dendrothrips octosparsus sp. n.

( Figs 8, 10 , 23 , 26 , 37 , 40 , 47–48 , 63–64 )

Female: Body mainly brown ( Fig. 63 ), abdominal tergites V–VI paler with 2 pairs of brown spots on lateral thirds ( Fig. 23 ), tergites VIII–X slightly paler than VII. Antennal segments I–II and VI–VIII brown, III–V paler ( Fig. 47 ); fore wing brown with 3 pale areas: basal fifth (with brown spots at extreme base), medially and sub-apically; clavus pale with base shaded; legs brown but tarsi yellow.

Head ( Fig. 8 ) about 2.5 times as wide as long, ocellar triangle reticulate with dots; ocellar setae minute, pair II situated lateral to fore ocellus, pair III in front of hind ocelli; frons covered with vermiform wrinkles, with 2 pairs of stout setae near bases of antennae; maxillary palps 2-segmented. Antennae 8-segmented, segment II with transverse striae, III–IV with forked sense cone, VI with inner long sense cone arising near medial of segment and extending to apex of VIII; microtrichia rows present on segments III–VI. Pronotum ( Fig.10 ) 2.2–2.6 times as wide as long, sculptured with transverse reticles bearing strong granules, median reticles indistinct and all setae minute. Mesonotum ( Fig. 26 ) with transverse anastomosing striae bearing few dots, median setae situated medially; metanotum with dots in median reticles, with wrinkles in lateral reticles. Fore wing without uniform microtrichia, first vein with 14–20 minute setae, second vein with one seta in subapical brown area or without setae. Abdominal tergites with complex sculpture ( Fig. 23 ), tergites II–IV & VII sculptured with reticles bearing inner dots, but anterior reticles transverse with fewer inner dots; tergites V–VI anteriorly with dots in transverse reticles, posteriorly with tubercles on yellow areas and dots on brown areas; tergite VIII laterally reticulate with granules or ridges, posterior margin with comb of microtrichia; tergite IX laterally with microtrichia on striae, posteromarginal setae S1 almost as long as S2; IX–X with microtrichia on posterior half. Sternites reticulate with longitudinal linear markings; sternites II–III with 2 pairs of marginal setae, sternites IV–VI with 3 pairs of marginal setae, S1 & S2 situated on posterior margin, S3 generally in front of posterior margin; sternite VII with S2 & S 3 in front of posterior margin, 1 pair of minute anterolateral pores in front of S2, 2 pairs of minute setae on posterior margin situated on either side of S2 ( Fig. 37 ).

Measurements (holotype female in microns). Total distended body length 880. Head length (width) 60 (150); eye length (width) 50 (35). Pronotum length (width) 75 (180). Length of antenna 170; length (width) of antennal segments I 17 (21), II 25 (27), III 33 (19), IV 30 (19), V 25 (16), VI 20 (11), VII 10 (5) and VIII 10 (4). Fore wing length 650.

Male: Smaller and paler ( Fig. 64 ), abdomen more slender. Head, thorax and lateral areas of abdominal tergites II–IV brown, tergite VII (and sometimes anterior of tergite V) pale brown, tergites V–VI and VIII–X pale yellow; antennae almost brown ( Fig. 48 ); legs brown with tarsi yellow; fore wing brown with basal quarter and median 1/8 pale. Abdominal tergites II–IV & VII sculptured with reticles bearing inner granules, tergites V–VI with short longitudinal lines in reticles ( Fig. 40 ).

Measurements (paratype male in microns). Total distended body length 750. Head length (width) 50 (125); eye length (width) 50 (35). Pronotum length (width) 65 (145). Length of antenna 160; length (width) of antennal segments I 14 (19), II 26 (22), III 33 (16), IV 26 (17), V 27 (15), VI 17 (11), VII 8 (5), VIII 9 (3). Fore wing length 475.

Material examined. Holotype female (in SCAU): CHINA, Shandong, Zhangqiu, Baimai Springs Park (36°43'10"N, 117°31'56"E), collected from leaves of Ligustrum sp. [ Oleaceae ], 2.viii.2016 (Zhaohong Wang) . Paratypes (in SCAU): 30 females and 9 males collected with holotype (with one female and 1 male in ANIC) . Shaanxi, Xi’an, Yangling (34°16'N, 108°04'E), 2 females from Ligustrum quihoui , 10.vi.2012 (Majid Mirab-balou) . Sichuan: Chengdu, Chengjia (30°10′N, 103 103° °22 22′ ′E E)),, 14 femalesfromL. quihoui , 3.ix.2015 (Zhaoyun Lü) . Chongqing, Dazu, Shuangqiao (29°29'N, 105°46'E), 6 females, host unknown, 26.vii.2016 (Jie Jiang) . Hubei, Huanggang, Huanggang Normal University (30°26'N, 114°56'E), 11 females from L. vicaryi , 22.vi.2014 (Chao Zhao) . Hunan, Yanling, Shennonggu National Nature Reserve (26°30'N, 113°59'E), 1 female 2 males from shrub, 25. viii. 2015 (Zhaohong Wang); Yiyang, Datonghu Twon (29°11′39″N, 112°37′23″E), 25 females collected from Osmanthus fragrans , 7.xi.2016 (Xiaoli Tong); Chaling County, Yunyangshan National Forest Park (26°47'58"N, 113°30'18"E), 12 females 2 males from leaves of Ligustrum sp., 8.viii.2017 (Zhaohong Wang) . Jiangxi, Jiujiang, Mt. Lushan (29°33'N, 115 115° °59 59' ' E E)),, 2 femalesfemalesfemales 4 malesmalesmales fromfromfrom L. sinense , 9.xi.2015 (Xiaoli Tong) . Guangxi, Hezhou, Guposhan National Forest Park (24°59′55″N, 111°56′73″E), 7 females from Ligustrum sp., 17.ix.2015 (Chao Zhao) .

Distribution: China (Shandong, Shaanxi, Sichuan, Hubei, Hunan, Jiangxi, Guangxi).

Host plants: Ligustrum quihoui , L. sinense , L. vicaryi , Ligustrum sp.; Osmanthus fragrans [ Oleaceae ].

Etymology. Specific epithet octosparsus is derived from Latin octo (eight) and sparsus (spot), refers to the abdominal tergites V–VI with eight brown spots.

Comments. This species shares morphological affinity with members of cibarius species group in sculpture of body and fore wing surface, and in this group, it is particularly similar to latimaculatus , but can be distinguished by the following combination: (1) tergites V–VI paler than tergites IV and VII, with two pairs of lateral brown spots ( Fig. 23 ), while in latimaculatus , tergites IV–VI paler than III and VII ( Fig. 20 ); (2) female fore wing with sub-basal area dark brown, hind vein has 0–1 setae (vs. female fore wing of latimaculatus sub-basal brown band with paler area medially, hind vein with 3–5 setae); (3) male fore wing brown at apical 1/3 (vs. male fore wing pale sub-apically); (4) male abdominal tergites V–VI with short longitudinal lines in reticles ( Fig. 40 ) (vs. tergites V–VI with tubercles, Fig. 39 ). Specimens in different populations from several provinces in China show few variations, the color pasterns of fore wing and tergites are consistent among populations.

Figures

FIGURES 1–11. Dendrothrips. Head and pronotum 1–5: (1) latimaculatus; (2) diaspora; (3) ornatus; (4) minowai; (5) homalii. Head and thorax of magnoliae 6–7: (6) female; (7) male. (8) Head of octosparsus sp. n. Pronotum 9–11: (9) jeanneli; (10) octosparsus sp. n.; (11) stannardi.

FIGURES 12–23. Dendrothrips. Fore wing 12–16: (12) homalii; (13) minowai; (14) stannardi; (15) howeii; (16) stannardi. Tergites 17–23: (17) homalii III–VI; (18) sexmaculatus III–VI; (19) virgulatus III–VI; (20) latimaculatus IV–VII; (21) howeii III–V; (22) ornatus IV–VI; (23) octosparsus sp. n. IV–VII.

FIGURES 24–31. Dendrothrips. Meso- and metanotum 24–26: (24) latimaculatus; (25) ornatus; (26) octosparsus sp. n. Forewing 27–31: (27) latimaculatus female; (28) latimaculatus male; (29) magnoliae female; (30) magnoliae male; (31) ornatus.

FIGURES 32–37. Dendrothrips. Tergites 32–35: (32) diaspora IV–VI; (33) jeanneli IV–VI; (34) magnoliae IV–VII; (35) stannardi V–VII. Sternites 36–37: (36) jeanneli V–VII; (37) octosparsus sp. n. VI–VII.

FIGURES 38–40. Male tergites: (38) homalii III–IX; (39) latimaculatus IV–IX. (40) octosparsus sp. n. IV–VIII.

FIGURES 41–49. Antenna: (41) homalii male; (42) latimaculatus female; (43) latimaculatus male; (44) minowai; (45) magnoliae female; (46) magnoliae male; (47) octosparsus sp. n. female; (48) octosparsus sp. n. male; (49) stannardi.

FIGURES 63–68. Dendrothrips. octosparsus sp. n. 63–64: (63) female; (64) male. (65) sexmaculatus. (66) maltimaculatus. stannardi 67–68: (67) female; (68) male.