Gonioctena

Cho, Hee Wook & Lee, Jong Eun, 2010, Gonioctena koryeoensis (Coleoptera: Chrysomelidae: Chrysomelinae), a new species from Korea, with a description of immature stages, Zootaxa 2438, pp. 52-60 : 58-59

Key to the species of the genus Gonioctena in the Korean Peninsula

(modified from Cho & Lee 2008)

1. Posterior angles of pronotum with setigerous pores.................................................................................................... 2

- Posterior angles of pronotum without setigerous pores (Subgenus Brachyphytodecta ) ......... G. fulva (Motschulsky)

2. Anterior angles of pronotum with setigerous pores (Subgenus Sinomela ) ................................... G. aeneipennis Baly

- Anterior angles of pronotum without setigerous pores (Subgenus Gonioctena ) ......................................................... 3

3. Antennae fully reaching the elytral humeri with seventh to tenth segments elongate, each 2–2.3 times longer than wide ........................................................................................................................................ G. gracilicornis (Kraatz)

- Antennae never reaching the elytral humeri with seventh to tenth segments distinctly widened, each nearly as long as wide ......................................................................................................................................................................... 4

4. Ventral surface entirely or largely reddish to yellowish brown .................................................................................... 5

- Ventral surface entirely or largely black ..................................................................................................................... 6

5. Elytra with black spots.......................................................................................... G. koryeoensis Cho & Lee , sp. nov.

- Elytra without black spots................................................................................................................ G. kamiyai Kimoto

6. Femora and tibiae entirely reddish brown; pronotum and elytra without distinct black spots, rarely with obscure black spots..................................................................................................................................................................... 7

- Femora and tibiae at least partly black, if entirely reddish brown, pronotum or elytra with distinct black spots ....... 8

7. Head almost entirely black; antennae yellowish brown with distal four to five segments piceous ............................... ........................................................................................................................... G. jacobsoni (Ogloblin et Medvedev)

- Head yellowish brown with posterior portion black; antennae entirely yellowish brown .............. G. suwai Takizawa

8. Pronotum with a pair of triangular basal black markings; elytra reddish brown with five pairs of black spots; elytral suture black except for basal 1/4...................................................................................................... G. laeta Medvedev

- Without above combination of characteristics............................................................................................................. 9

9. Antennae yellowish brown with distal four to five segments each apically darkened ............ G. viminalis (Linnaeus)

- Antennae yellowish brown to brown with distal four to five segments black........................................................... 10

10. Elytra partly or entirely reddish brown, never entirely black, with or without black spots; tibiae black with median and apical portions largely reddish brown .................................................................................. G. coreana (Bechyné)

- Elytra entirely black or reddish brown, without black spots; tibiae entirely black, sometimes with apical portion partly dark brown ............................................................................................................................ G. sibirica (Weise)