Riseveinus hamatus, Wang & Dietrich & Zhang, 2018

Wang, Yang, Dietrich, Christopher H. & Zhang, Yalin, 2018, Four new species of the leafhopper genus Riseveinus Li (Hemiptera: Cicadellidae: Evacanthinae) from China and Thailand, Zootaxa 4508 (2), pp. 259-266 : 261

Riseveinus hamatus sp. nov.

( Figs 11–17 )

Description. Body length (incl. forewing): ♂, 8.3-8.5 mm. Head width (incl. eyes): 1.5–1.6 mm; head length: 1.5– 1.6 mm. Crown ( Fig. 11 ) about 3/4 length of pronotum and scutellum together.

Anal tube with barblike ventral process ( Fig. 14 ). Aedeagal shaft short, swollen at base and then gradually narrowing towards apex in lateral view, without apical processes; apodeme bilobed, dorsolateral extensions short, rounded; paired ventrolateral processes longer than aedeagal shaft, and close to aedeagal shaft in lateral view ( Figs 15, 16 ).

Type material. Holotype ♂ ( NMNS), TAIWAN, Taichung, Dashuishan Forest Rd. km 20, 1250m, 24°15'6"N 120°54'58"E, 18.vi.2004, C.H. Dietrich, 16-1, sweeping . Paratypes: 2♂♂ ( NWAFU, INHS), TAIWAN, Taichung, Dashuishan Forest Rd. km 23, 1600m, 24°14'48"N 120°56'8"E 18.vi.2004, J.H. Zahniser, 17-1, sweeping .

Etymology. The specific epithet “ hamata ”, meaning hooked, refers to the barblike ventral process of the anal tube ( Fig. 14 ).

Remarks. This species is very similar to R. sinensis (Jacobi) externally, but differs as follows: 1) anal tube with barblike ventral process ( Fig. 14 ); absent in R. sinensis ); 2) in lateral view, aedeagal shaft swollen at base and then narrowing towards apex gradually (aedeagal shaft same width from base to apex in R. sinensis ); 3) aedeagal ventral process evenly curved near apex (sinuate near apex in R. sinensis ).

Figures

FIGURES 11–17. Riseveinus hamatus sp. nov.: 11. male habitus, dorsal view; 12. male habitus, lateral view; 13. male face; 14. male pygofer side, lateral view; 15. aedeagal, connective and style, ventral view; 16. aedeagal, lateral view; 17. subgenital plate, ventral view.