Cavariella pustula Essig, 1937

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 pustula Essig, 1937

Figs 22 , 35C

Cavariella pustula Essig, 1937: 46.

Specimens examined.

Two ap. viv. fems. and two ala. viv. fems. (slides), one ap. viv. fem. (COI: OP956142 ), China: Beijing, 17.V.2021, No. 50011, on Salix , coll. G.X. Qiao and Y. Xu.

Diagnosis.

ABD TERG VIII with hooded supra-caudal completely hiding the cauda from above (Fig. 22H ); PT 0.55-0.91 × Ant. VIb; URS wedge-shaped (Fig. 22D ), 0.94-1.36 × HT II; cauda conical and constricted basally, blunt at apex (Fig. 22I ), the length 1.45-1.49 × basal width ( Essig 1937).

Comment.

The species is first recorded in China and with some variations in China as follows: Ant. III and IV each with 22, 5 circular secondary rhinaria in alatae, but in USA, Ant. III each with 5-9 circular secondary rhinaria arranged in a row in alatae, and Ant IV without secondary rhinaria ( Essig 1937).

The species resembles Cavariella aspidaphoides in ABD TERG VIII hooded supra-caudal process; dorsum of body with circular sculptures; but differs from C. aspidaphoides as follows: supra-caudal process only with two setae distally ( C. aspidaphoides : supra-caudal process with two setae distally and 3-5 short setae marginally); URS with one pair of accessory setae ( C. aspidaphoides : URS without accessory setae); PT shorter than Ant. VIb ( C. aspidaphoides : PT longer than Ant. VIb).

Biology.

The species feeds on tender tips of Salix (Fig. 35C ).

Distribution.

China (Beijing), Canada, USA.

Figures

Figure 22. Cavariella pustula Essig. Apterous viviparous female: A dorsal view of body B dorsal view of head C antenna D ultimate rostral segment E sculptures of abdomen F abdominal tergites V-VIII 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.