Tenguna Matsumura, 1910

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 : 58-59

Genus Tenguna Matsumura, 1910

Tenguna Matsumura, 1910: 104 . Type species: Tenguna watanabei Matsumura, 1910: 105 , by original designation.

Description

General color green or yellowish green; carinae on cephalic process, frons, pronotum and mesonotum, and parts of veins on fore wings, dark green; rostrum with extreme apex blackish; hind tibia with a black marking at extreme apex.

Head ( Figs 1–9 ) relatively short, produced into a moderate cephalic process shorter than pronotum and mesonotum combined. Vertex ( Figs 1–4, 7 ) with lateral margins carinate, sub-parallel at base, slightly sinuate in front of eyes, then gradually narrowing to arrowhead at apex; posterior margin angularly concave; median carina distinct and complete. Frons ( Figs 6, 9 ) with lateral margins carinate and nearly parallel-sided, posterior margin somewhat concave; median carina distinct, lateral carinae nearly parallel, approaching frontoclypeal suture. Postclypeus and anteclypeus ( Figs 6, 9 ) convex medially, with distinct median carina. Rostrum long, reaching beyond abdominal segment VI.

Pronotum ( Figs 1–4, 7 ) distinctly shorter than mesonotum medially, narrow anteriorly, broad posteriorly; disc broad with anterior margin centrally angularly produced, posterior margin angularly concave; with distinct median carina and two obscure lateral discal carinae (elevated only anteriorly). Mesonotum ( Figs 1–4, 7 ) tricarinate on disc, with median carina conspicuous, not reaching to apex, lateral carinae curving anteriorly towards median carina. Fore wings ( Figs 1–3 , 10, 11 ) with Sc+R, M and Cu all branched apically; stigma distinct, with 2–5 cells. Legs narrow and moderately long; fore femur with one minute, short, blunt spine near apex; hind tibia with 5–6 lateral black-tipped spines, spinal formula 8–(9–10)–(8–10).

Male genitalia: pygofer ( Figs 12–14 ) narrow and high in lateral view ( Fig. 13 ), ventrally distinctly wider than dorsally, anterior margin straight and posterior margin angularly produced posteriorly near apex. Anal tube ( Figs 12, 13 ) oval and large in dorsal view. Parameres ( Figs 13, 14 ) large, distinctly broadening towards apex in lateral view ( Fig. 13 ), posterior margin straight, upper margin with dorsally directed, black-tipped process near middle, with ventrally directed, hooklike process near sub-middle on outer upper edge. Aedeagus ( Figs 15–17 ) with pair of long, processes apically, processes with apex acute, sclerotized and pigmented; phallobase sclerotized and pigmented at base, with pairs of membranous lobes at apex.

Female genitalia: anal tube ( Fig. 18 ) round and large in dorsal view. First valvula ( Fig. 19 ) strongly sclerotized with 7 different sized teeth in lateral view; second valvulae ( Fig. 20 ) triangular, symmetrical in ventral view, connected at base and separated from 1/4 base; third valvula ( Fig. 21 ) with 2 sclerotized lobes, lateral lobe with 1–4 long spines at apex.

Remarks

Tenguna species can be distinguished from other dictyopharid planthoppers by the combination of the following diagnostic characters: general color green or yellowish green; vertex with median carina distinct and complete, lateral margins sub-parallel at base, slightly sinuate in front of eyes, then gradually narrowing to arrowhead at apex; pronotum with distinct median carina and two obscure lateral discal carinae, elevated only anteriorly; fore femur with one minute, short and blunt spine near apex; aedeagus with a pair of processes apically and phallobase with pairs of membranous lobes apically.

Species of Tenguna are externally similar to those of Centromeria Stål, 1870 , but can be separated from the latter by the general color which is almost uniformly green or yellowish green (vertex, frons, genae and pronotum with orange red markings or stripes in Centromeria species); and vertex with median carina complete (median carina only present at base in Centromeria species).

The genus Tenguna also superficially resembles Dictyopharina Melichar, 1903 , but differs from the latter in that the head is relatively elongate and narrower; vertex with lateral margins slightly sinuate in front of eyes and then gradually narrowing to arrowhead at apex and the fore wings having less reticulate venation.

Distribution

Southern China (Guizhou, Hubei, Sichuan, Taiwan, Xizang).

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.