Riseveinus elongatus, Gou & Xing, 2024

Gou, Guangli & Xing, Jichun, 2024, Key to species of the genus Riseveinus Li & Wang, 1995 (Hemiptera: Cicadellidae: Evacanthinae) with description of a new species, Zootaxa 5399 (3), pp. 296-300 : 298-300

Riseveinus elongatus sp. nov.

Figs. 1–9

Description. Body ( Fig. 1 ) black, body and forewings densely wrinkled and pubescent. Head width (incl. eyes): 1.4–1.5 mm; head length: 1.3–1.4 mm. Vertex ( Figs. 1, 3 ) elongate, nearly as long as pronotum and scutellum together. Forewing ( Figs. 1, 2 ) black with well defined pale areas along costal margin just based and distad of mid length, inner margin of clavus near base and appendix also pale.

Male genitalia. Pygofer ( Fig. 5 ) longer than height, triangularly produced caudally, with some setae near end. Subgenital long, with two rows of macrosetae ( Fig. 6 ). Aedeagus ( Figs. 7, 8 ) with well developed bilobed dorsal apodeme, dorsal apodeme extended into pair of dorsolateral antlerlike extensions, with unpaired curved process shorter than shaft; shaft long, with apical processes longer than ⅔ length of shaft. Connective ( Fig. 9 ) Y-shaped and stem longer than arms. Style with apical process slender and broadening to the middle ( Fig. 9 ).

Measurement. Length (including tegmen): ³, 5.4–5.8mm.

Material examined. Holotype: ³, CHINA: Yunnan Prov., Menghai Country , 100°44.845′ E 21°95.835′ N, 1170 m,

17 May 2023, coll. Gunagli Gou ( GUGC). Paratypes: 1³ , same data as holotype .

Remarks. The new species closely resembles R. cervcornutus Wang et al., 2018 , but differs in being much smaller and in having the head more elongated the connective and aedeagus shorter, and the aedeagal processes shorter and curved laterad rather than mesad distally.

Etymology. The species name, the Latin word elongatus , refers to the elongate apical processes of the aedeagal shaft.

Figures

FIGURES 1–4. Riseveinus elongatus sp. nov.:1. ³, dorsal view; 2. ³, lateral view; 3. ³, Head and thorax, dorsal view; 4. ³, face.

FIGURES 5–9. Riseveinus elongatus sp. nov. 5. Male pygofer side, lateral view; 6. Subgenital plates, ventral view; 7.Aedeagus, connective and style, lateral view; 8. Aedeagus, ventral view; 9. Connective and style, ventral view.