Neohydatothrips reticulatus (Kudo), 2007

Feng, Qingjing, Wang, Jiayang & Tong, Xiaoli, 2021, Neohydatothrips from China, with one new species and one new record (Thysanoptera: Thripidae), Zootaxa 5057 (4), pp. 562-570 : 563-565

Neohydatothrips reticulatus (Kudo)

( Figs 1–8 )

Hydatothrips (Kazinothrips) reticulatus Kudo, 1991: 523 .

Neohydatothrips reticulatus (Kudo) Wang, 2007: 58 .

Female macroptera. Body dark brown, abdominal segments I–VI light brown ( Fig. 1 ); antennal segment I yellow shaded with brown basally, II yellow, III–IV light brown, V–VII brown ( Fig. 4 ); legs dark brown, tarsi yellowish brown; fore wing dark brown with sub-basal pale band, clavus dark brown ( Fig. 5 ). Abdominal tergites I–VI brown uniformly, VII–X dark brown ( Fig. 8 ). Head ( Fig. 2 ) wider than long, slightly constricted behind bulged eyes; ocellar region faintly upheaval, sculptured with polygonally reticulate; occipital apodeme not confluent with posterior margin of eyes, distance between posterior margin of compound eyes and occipital apodeme approximately 2.0 times as long as diameter of one ommatidium; three pairs of ocellar setae present, pair III within ocellar triangle. Antennae 7-segmented ( Fig. 4 ), segments III and IV each with forked sense cone and apical neck, sense cone on V–VI with short base. Pronotum rectangle, sculptured with polygonally reticulate, no wrinkles within reticle ( Fig. 2 ); blotch bowtie-shaped and well defined, with closely spaced transverse anastomosing striae. Mesonotum sculptured with scallop-like transverse striae on anterior half, with wrinkles between striae; median pair of setae anterior to submedian pair. Metanotal striations irregular reticulate medially, with dots and wrinkles; median pair of setae close to anterior margin ( Fig. 2 ). Fore wing first vein with complete setal row of 18–21 setae, second vein with no setae ( Fig. 5 ). Abdominal tergites ( Fig. 8 ) and sternites without craspedum; campaniform sensilla present on tergites II–V only; posterior margin of tergite I absent comb of microtrichia medially, II–VI with rudimentary tiny comb of microtrichia medially; VII–VIII with complete comb of microtrichia on posterior margin ( Fig. 3 ). Sternites without discal setae; sternites II with 2 pairs of posteromarginal setae, III–VII with 3 pairs; VII with all setae ahead of posterior margin ( Fig. 6 ), but sometimes S 2 setae on posterior margin ( Fig. 7 ).

Measurements (one female in microns). Distended body length 1150. Head length (including anterior prolongation) 30, width 64. Antennal segments I–VII length (width) as follows: 28 (28), 32 (25), 52 (16), 48 (16), 45 (15), 61 (13), 30 (8). Pronotal median length (width) 128 (200). Fore wing length 860.

Male. Unknown.

Distribution. Japan (Honshu), China (Hunan).

Material examined. CHINA, Hunan Province, Yanling County, Shennonggu National Forest Park, 4 females, 25.viii.2015, Poaceae grass, Zhaohong Wang .

Remarks. Previously known only from Japan N. reticulatus is here recorded from China for the first time. Among the four females from China listed above, all collected from the same population, the position of the S2 setae on abdominal sternite VII varies as follows: (1) all setae ahead of the posterior margin ( Fig. 6 ) as given in the original description ( Kudo 1991); (2) all but S2 setae ahead of the posterior margin ( Fig. 7 ); (3) one S2 seta on the posterior margin but the other ahead of the margin. This species shares morphological affinities with N. xestosternitus including the antennae 7-segmented, but it can be distinguished by (1) abdominal tergites I–VI uniformly light brown, VII–X dark brown (versus tergites V–VI yellow, I–IV and VII–X brown in xestosternitus , see Figure 9 ); (2) antennae slender and elongate, segment VI about 4.7 times as long as wide (versus segment VI about 2.7 times as long as wide in xestosternitus ); (3) sense cone on antennal segments V–VI with short base (versus sense cone on antennal segments V–VI with wide base in xestosternitus ).

Figures

FIGURES 1–7. Neohydatothrips reticulatus, female: (1) N. reticulatus female; (2) Head, pronotum, meso-& metanotum; (3) Tergites VI–X; (4) Antenna; (5) Fore wing; (6) Sternites VI & VII, showing VII with all setae ahead of posterior margin; (7) Sternites VI & VII, showing VII with only S2 setae on posterior margin.

FIGURES 8–9. (8) Abdominal tergites of N. reticulatus; (9) Abdominal tergites of N. xestosternitus (Holotype in NZMC, Beijing).