Cavariella nipponica Takahashi, 1961

Xu, Ying, Chen, Jing, Jiang, Li-Yun & Qiao, Ge-Xia, 2023, Cavariella Del Guercio (Hemiptera, Aphidinae, Macrosiphini) in China, with a new species, new synonymies, and first country records, ZooKeys 1169, pp. 235-292 : 235

Cavariella nipponica Takahashi, 1961

Figs 20 , 35A

Cavariella nipponica Takahashi, 1961: 8.

Specimens examined.

One ap. viv. fem., China: Liaoning, 29.VI.1984, No. Y 4977-1-2, on Salix , coll. G.X. Zhang and L.J. Liu ( Jiang et al. 2011) ; two ap. viv. fems. and two ala. viv. fems. (slides), one ap. viv. fem. (COI: OP956118 ), Beijing, 14.V.2014, No. 31000, on Salix , coll. Y. Wang, J.J. Tang and F.F. Niu ; one ap. viv. fem. and one ala. viv. fem. (slides), one ap. viv. fem. (COI: OP956116 ), Sichuan ( Jiuding Mountain ), 23.VIII.2013, No. 30077-1-1, host plant unknown, coll. R. Chen ; one ap. viv. fem. and one ala. viv. fem., Beijing, 4.VIII.2017, No. 41401-1-1, on Apiaceae , coll. G.X. Qiao and X. Yang ; two ap. viv. fems. (slides) and one ap. viv. fem. (COI: OP956150 ), Sichuan ( Aba City ), 22.VI.2021, No. 51630-1-1, on Salix , coll. T.Y. Liu and S. Xu ; one ap. viv. fem., Beijing, 17.VII.2016, No. 37063-1-1, on unknown, coll. R.J. Zhang and S.F Xu.

Diagnosis.

ABD TERG VIII with long conical supra-caudal (Fig. 20H ), 0.15-0.27 mm, 0.92-1.85 × cauda; PT mostly short than Ant. VIb (Fig. 20C ); URS wedge-shaped (Fig. 20D ), 1.01-1.07 × HT II; SIPH long clavate (Fig. 20G ), 2.16-2.59 × cauda, 0.20-0.22 × body length; Ant. III-V each with 26-36, 5 or 6, 1 or 2 circular secondary rhinaria in alatae (Fig. 20K ).

Comment.

The species has some variations in China, as follows: PT 0.83-1.26 × Ant. VIb, in most specimens PT shorter than Ant. VIb, but sometimes PT slightly longer than Ant. VIb (original description: PT 0.70-0.75 × Ant. VIb); URS 1.01-1.07 × HT II (original description: URS 1.40 × HT II) ( Takahashi 1961).

Biology.

Primary host plant: Salix ; secondary host plant: Apiaceae including Anthriscus , Angelica , Heracleum ( Takahashi 1961). The species feeds on young leaves of the host plant (Fig. 35A ).

Distribution.

China (Beijing, Hebei, Liaoning, Sichuan), Bhutan, Japan, Russia.

Figures

Figure 20. Cavariella nipponica Takahashi. Apterous viviparous female: A dorsal view of body B dorsal view of head C antenna D ultimate rostral segment E mesosternal furca F sculptures of abdomen G siphunculus H supra-caudal process on abdominal tergite VIII I cauda. Alate viviparous female: J dorsal view of body K antenna L siphunculus M supra-caudal process on abdominal tergite VIII N cauda O genital plate. Scale bars: 0.10 mm.

Figure 35. The ecological habitat photographs of Cavariella in field. A the apterae and nymphs of Cavariella nipponica Takahashi feeding on the underside leaves of Salix B one aptera of Cavariella pastinacae (Linnaeus) feeding on tender stem of Apiaceae C the apterae and nymphs of Cavariella pustula Essig feeding on tender stem of Salix D the apterae and nymphs of Cavariella salicicola (Matsumura) feeding on tender stem of Salix.