Gonioctena

Suenaga, Haruki, 2012, A new species of the genus Gonioctena (Coleoptera: Chrysomelidae: Chrysomelinae) from Shikoku, Japan, with description of its immature stages, Zootaxa 3268, pp. 29-39 : 38

Key to Japanese species of Gonioctena ( hiranoi species - complex) (modified from Takizawa, 2007)

1 Pronotum and elytra with obscurely demarcated black spots, sometimes entirely reddish-brown to blackish.......................................................................................... G. (G.) takahashii Kimoto, 1963 .

- Pronotum and elytra with well-demarcated black spots........................................................ 2

2 Aedeagus with apical process robust distinctly widened apically ( Figs. 43, 44 and 48 ). Pronotum and elytra generally with smaller black spots. Femora yellowish-brown....................................... G. (G.) hiranoi Takizawa, 1989 .

- Aedeagus with apical process slender, not widened apically. Femora black........................................ 3

3 Aedeagus with apical process knob-shaped at apex in lateral view ( Figs. 40 )................. G. (G.) hoki Takizawa, 2007 .

- Aedeagus with apical process rather subparallel-sided in lateral view............................................. 4

4 Apical process of the aedeagus large and long in dorsal view ( Figs. 41, 42 and 47 )........ G. (G.) simotuke Takizawa, 2007 .

- Apical process of the aedeagus small and short in dorsal view.................................................. 5

5 Anterior margin of median lobe square-shaped ( Fig. 45 ). Endemic to Kyushu, Japan....... G. (G.) katsuyai Takizawa, 2007 .

- Anterior margin of median lobe ovoid ( Fig. 5 ). Endemic to Shikoku, Japan.......................... G. (G.) iyonis n. sp.

Figures

FIGURES 37 – 48. Median lobe of male genitalia: dorsal view: 37, 39, 41, 43; lateral view: 38, 40, 42, 44; ventral view: 45, 46, 47, 48; 37, 38, 45: Gonioctena katsuyai Takizawa, 2007; 39, 40, 46: Gonioctena hoki Takizawa, 2007; 41, 42, 47: Gonioctena simotuke Takizawa, 2007; 43, 44, 48: Gonioctena hiranoi Takizawa, 1989.

FIGURES 3 – 9. Gonioctena (Gonioctena) iyonis n. sp., male genitalia. 3: Dorsal view of median lobe, 4: lateral view of median lobe, 5: ventral view of median lobe, 6: spicule, 7: tegmen, 8: seventh tergite, 9: eighth tergite.