Neohydatothrips flavicingulus, Mirab-Balou, Majid, Tong, Xiao-Li & Yang, Shu-Lan, 2013

Mirab-Balou, Majid, Tong, Xiao-Li & Yang, Shu-Lan, 2013, Neohydatothrips (Thysanoptera: Thripidae) from China: new species and records, with a key to species, Zootaxa 3700 (1), pp. 185-194 : 187-193

Neohydatothrips flavicingulus sp. n.

( Figs 8–22 )

Female macroptera ( Fig. 8 ). Body bicolored. Antennal segments I and II yellow, III mostly yellow but pale brown apically, IV–VIII brown except IV yellow at base ( Fig. 10 ); head dark brown but paler at postoccipital region; pronotum brown, blotch dark brown; meso- and metanotum brown; legs mainly brown, tibiae and tarsi yellow; fore wings with pale sub-basal area then uniformly brown, base dark including clavus; abdominal segments I–IV brown, V–VI yellow, VII–X dark brown; tergites II–VII with dark antecostal line.

Head wider than long, with closely spaced transverse lines within ocellar triangle, with occipital apodeme touching posterior margin of eyes, with three pairs of ocellar setae, pair III situated outside ocellar triangle, with four pairs of postocular setae mesad of inner posterior angle of compound eye ( Fig. 12 ). Antennae 8-segmented ( Fig. 10 ); segments II–VI covered with rows of microtrichia on both dorsal and ventral view. Mouth cone long, reaching to posterior margin of prosternum.

Pronotum transversely reticulate in front of blotch, with markings between the major lines; pronotal blotch transversely striate with many markings between the major lines anterior and posterior margin straight ( Fig. 17 ), with a pair of long posteroangular setae and one pair of short posteromarginal setae, anterior margin with three pairs of setae. Mesonotum with closely spaced striations, and small lines between the major striae; median setae situated far from posterior margin; a paired of campaniform sensilla absent ( Fig. 13 ). Metanotum with linear reticulation, many small linear markings between the major sculpture lines, median setae situated on anterior margin, metanotal campaniform sensilla absent ( Fig. 13 ). Fore wing second vein with 2 distal setae ( Fig. 14 ), clavus with 4 marginal setae and one discal seta.

Abdominal tergites I–II without marginal microtrichia medially, III–VIII with complete row of marginal microtrichia, shorter medially on III–IV; tergites II–VIII with discal microtrichia laterally and extending medially near anterior margin, tergites II–IV without wrinkles among microtrichia; tergite IX smooth, without discal microtrichia, present on X ( Fig. 15 ); tergal median setae situated behind antecostal ridges. Sternites without discal setae, sternites VII with three pairs of posteromarginal setae arising in front of posterior margin; sternites with discal microtrichia present only laterally. Ovipositor well developed.

Measurements of holotype female in microns. Body length 1290. Head, length 205; width across eyes 127; eyes 50 (57), distance between two compound eyes 86. Pronotum, length 140; width 260; pronotal blotch 210 (73); blotch posteroangular setae 58. Metanotum median setae length 39. Fore wing length 870. Antennal segments I to VIII length (width) as follows: 20 (26), 42 (30), 70 (21), 65 (24), 46 (19), 59 (17), 10 (6), and 12 (5).

Male macroptera ( Fig. 9 ). Distended body length 0.8 mm. Similar to female in color and structure; antennal segment VI with normal base sense cone ( Fig. 11 ), smaller than sense cone on female; abdominal tergite IX with setae S1 as long as S2, but situated in front of S2; abdominal sternites without pore plate.

First instar larva. Body pale yellow to yellowish brown, including antennal segments I and IV, the other segments yellow to pale brown; mouth cone dark. Body length/width (microns) 520–550 / 139–145, head 72/74, pronotum 125/74; antennae length 162–170.

Second instar larva ( Fig. 22 ).,Largely pale in color, but antennae, head, pronotum, fore and middle tibiae, apical half of abdominal segment X gray, apex of antennal segment III and more part of IV pale; all body setae gray. Body L/W 737–790/220.

Head weakly sculptured, W/L 125/98. Antenna length 230; antennal segment III L/W 59/28, IV L/W 78/23; segments III and IV with rows of microtrichia; dorsal setae on segments II and III fimbriate. Pronotum unsculptured. Abdominal tergites with transverse rows of dot-like on the surface. Sternites unsculptured, with pointed setae. Length of legs as follows: fore leg 230, mid leg 217, and hind leg 237.

Chaetotaxy of second instar larva (in microns). Most dorsal setae moderately long and fan-shaped. Head with setae S3 longer than others, S1–S5 length as follows: S1 7, S2 17, S3 25, S4 23, and S5 6. Pronotum: S1 10, S2 10, S3 14, S4 8, S5 10, S6 22, S7 11. Mesonotum with S4 longer than other setae: S1 9, S2 6, S3 9, S4 20, S5 9, S6 8, S7 14; metanotum S1 longer than S2, and S4 longer than S3: S1 9, S2 8, S3 16, and S4 18. Abdominal tergites IV–IX with S1 and S2 setae length as follows: IV 8,13; V 14,14; VI 12,14; VII 14,17; VIII 12,17; IX 20,26; tergite X median setae (S1) 18.

Material studied. Holotype female (in SCAU), CHINA, Guangdong Province: the campus of South China Agricultural University (23°09′N, 113°21′E), Guangzhou, from Manglietia fordiana (Magnoliaceae) , 27.ix.2012, Yang Shu-lan.

Paratypes: 35 females, 18 males, collected with holotype; 17 females, 12 males collected from same place with holotype, 26.x.2012; 1 female, the Arboretum (23°09′N, 113°21′E) at South China Agricultural University, Guangzhou, from leaf-litter, 18.x.2004, coll. Wang Jun; 10 females, 3 males, Yunnan Province: Xishuangbannan Tropical Botanical Garden (21°55′N, 101°16′E), Menglun, from Cinnamomum camphora , 12.iv.1987, Zhang Weiqiu; 4 females, 1 male, Guangxi: Longzhou (22°20′N, 106°51′E), from Magnolia denudata , 28.vii.1985, Zhang Wei-qiu.

Economic importance. Both adults and larvae of N. flavicingulus sp. n. feed on the outer surface to inner surface of leaves of Manglietia fordiana ( Figs 19, 20 ). It can cause severe damage to the leaves resulting in silver spots on the leaves and finally, the leaves are rolling ( Figs 18, 22 ).

Remarks. This new species is similar to N. surrufus but it can readily distinguished by having abdominal tergites II–VII with the median pair of setae situated behind the antecostal ridge, and the anterior portion of sternite VII not forming 2 protuberances. N. surrufus , in contrast has the median setae on tergites II–VII situated on the antecostal ridges, and sternite VII with two protuberance at the anterior margin. It is distinguished from N. concavus sp. n. by the straight posterior margin of the pronotal blotch, and tergites II–VIII with discal microtrichia laterally and extending medially near anterior margin.

This new species is also distinguished from N. medius by characters stated in the above key. According to the original description by Wang (1994: 257), the color of tibiae and tarsi is yellow, but in the recent key by Wang (2007: 59, couplet 8) the color is brown, and the other species Hydatothrips (Neohydatothrips) pectinarius Kudô (1997: 338) that was synonymized by Wang (2007: 61) is also with brown color on tibiae and tarsi (see also Kudô 1997: 338). In this new species, all of specimens have yellow color on their tibiae and tarsi.

Etymology. The name flavicingulus is derived from Latin flavus (yellow) and cingulus (belt), and refers to the new species with yellow color of abdominal tergites V–VI.

Figures

FIGURES 8 – 11. Neohydatothrips flavicingulus sp. n. (8) Female (5 X); (9) Male (10 X); (10) Antenna, female; (11) Antenna, male.

FIGURES 12 – 17. Neohydatothrips flavicingulus sp. n. (12) Head, female; (13) Meso- and metanotum; (14) Fore wing, distal part; (15) Abdominal tergites VII – X; (16) Metasternum; (17) Pronotum.

FIGURES 18 – 22. Neohydatothrips flavicingulus sp. n. (18) Manglietia fordiana (damaged by thrips); (19) Adults and first instars of larvae; (20) Larval stages I and II, feeding leaf; (21) Leaf rolling, damaged by thrips; (22) Larva II [A. Adult, L 1. Larva I, L 2. Larva II].