Tenguna medogensis, Song, Zhi-Shun & Liang, Ai-Ping, 2007

Song, Zhi-Shun & Liang, Ai-Ping, 2007, A new species of the Oriental planthopper genus Tenguna Matsumura, 1910 (Hemiptera: Fulgoroidea: Dictyopharidae) from Xizang, China, Zootaxa 1439, pp. 57-64 : 60-63

Tenguna medogensis sp. nov.

( Figures 2, 3 , 7–9, 11–21 )

Description

Male, BL: 13.8–14.7 mm; HL: 1.8–2.0 mm; HW: 1.4–1.5 mm; FWL: 10.8–11.4 mm. Female, BL: 12.0– 12.6 mm; HL: 1.6–1.7 mm; HW: 1.2–1.3 mm; FWL: 9.3–9.8 mm.

General color and external characters as in generic description. Vertex ( Figs 2, 3 , 7 ) relatively narrow, with ratio of length to width between eyes about 3.0:1; disc between eyes convex medially and remainder part somewhat upturned. Pronotum ( Figs 2, 3 , 7 ) with lower lateral carinae between eyes and tegulae not observed in dorsal view ( Fig. 7 ). Fore wings as in figures 2, 3 and 11, stigma distinct, with 2–3 cells. Hind tibia with 5 lateral black-tipped spines, spinal formula 8–9-(8–9).

Male genitalia: pygofer ( Figs 12–14 ) ventrally distinctly wider than dorsally (about 3:1), posterior margin with distinct, posteriorly directed process near apex in lateral view ( Fig. 13 ); dorsal margin deeply excavated to accommodate anal tube, dorsal-lateral margins angularly produced posteriorly in dorsal view ( Fig. 12 ). Anal tube ( Figs 12, 13 ) nearly long triangular in lateral view ( Fig. 13 ), large and elongate in dorsal view ( Fig. 12 ), with ratio of length to width at middle about 1.7:1. Anal style short and broad. Parameres ( Figs 13, 14 ) large and broad in lateral view ( Fig. 13 ), distinctly humped distinctly near apex in ventral view ( Fig. 14 ). Aedeagus ( Figs 15–17 ) short and stout, with pair of long, asymmetrical, phallical processes; processes turned anterodorsally and intercrossed at basal half, and directed anterolaterally in dorsal view ( Fig. 15 ); phallobase with two pairs of membranous lobes at apex: dorsal pair above phallobase and other ventral pair below phallobase in lateral view ( Fig. 16 ).

Female genitalia: anal tube ( Fig. 18 ) round and large in dorsal view, ratio of length to width at middle about 1:1. Valvulae ( Fig. 19–21 ) as in generic description.

Material examined

Holotype: ɗ, Southwestern China: Xizang, Medog, Maniweng (29.27337ºN, 96.16859ºE), 895 m, 14.VIII.2006 (Z. S. Song), light trap. Paratypes. 3ɗɗ, 3ΨΨ, same data as holotype; 5ɗɗ, 5ΨΨ, Xizang, Medog, Aniqiao (29.32874ºN, 95.14866ºE), 1080 m, 12–13.VIII.2006 (Z. S. Song); 1Ψ, Xizang, Medog, Beibeng (29.24349ºN, 95.17145ºE), 786 m, 17.VIII.2006 (Z. S. Song) (all in IZCAS).

Distribution

Southwestern China (Xizang).

Remarks

The species can be distinguished from T. watanabei by the relatively narrow vertex, with ratio of length to width between eyes about 3.0:1 (about 2.4: 1 in T. watanabei ); pronotum with lower lateral carinae between eyes and tegulae not observed in dorsal view ( Fig. 9 ); phallobase with two pairs of membranous lobes at apex (three pairs of lobes in T. watanabei ).

The discovery of this species not only broadens our knowledge of the morphology and biogeography of the genus, but also represents the first record of the planthopper family Dictyopharidae in Xizang, China.

Figures

FIGURES 1 – 3. Dorsal habitus of Tenguna Matsumura, 1910. 1. Tenguna watanabei Matsumura, 1910; 2. Tenguna medogensis sp. nov., male, holotype; 3. same, female, paratype.

FIGURES 4 – 11. Tenguna watanabei Matsumura, 1910 (Figs 4 – 6, 10); Tenguna medogensis sp. nov., male, holotype (Figs 7 – 9, 11). 4, 7. head, pronotum and mesonotum (dorsal view); 5, 8. head and pronotum (lateral view); 6, 9. head (ventral view); 10, 11. left wing. Scale bars: Figs 4 – 9 = 0.5 mm, Figs 10, 11 = 1 mm.

FIGURES 12 – 21. Tenguna medogensis sp. nov. 12. male, holotype, pygofer and anal tube (dorsal view); 13. genitalia (lateral view); 14. pygofer and parameres (ventral view); 15. aedeagus (dorsal view); 16. same (lateral view); 17. same (ventral view); 18. female, paratype, anal tube (dorsal view); 19. first valvula (lateral view); 20. second valvulae (ventral view); 21. third valvula (lateral view). Scale bars: Figs 12 – 21 = 0.2 mm.