Gonioctena kanfani (Chen, 1941)

Cho, Hee-Wook, 2022, Two new species of the nominotypical subgenus Gonioctena Chevrolat, 1836, from China and Laos, and a proposed new species-group (Coleoptera: Chrysomelidae: Chrysomelinae), Zootaxa 5150 (1), pp. 111-120 : 112

Key to the species of the Gonioctena kanfani species-group

1 Pronotum without black spots ( Fig. 3 ); elytral striae in single rows of punctures, partially irregular.................... 2

- Pronotum with nine black spots, rarely enlarged and connected ( Figs 1 , 5, 6 ); elytral strial punctures entirely confused single or double rows......................................................................................... 3

2 Median lobe in dorsal view constricted in middle and abruptly before apex to an approximately triangular process with slightly expanded tip ( Fig. 8 ), in lateral view apical half abruptly enlarged but with thin curved apical process; body length 6.4–8.3 mm; China (Zhejiang).................................................................... G. lukasi new species

- Median lobe in dorsal view long, thin and parallel-sided then gradually contracted almost to slightly expanded apical process ( Fig. 9 ), in lateral view entirely thin and moderately curved with apical process thinner and recurved; body length 7.1–8.8 mm; China (Anhui, Zhejiang)................................................................. G. kanfani (Chen)

3 Larger, body length 7.8–8.9 mm; median lobe in dorsal view parallel-sided with apical process slightly broader than shaft ( Fig. 11 ); China (Fujian)............................................................. ... G. fujiana Cho & Borowiec

- Smaller, body length 5.6–7.8 mm; median lobe in dorsal view subparallel-sided with a distinct constriction before apical process, which is narrower than median lobe shaft ( Figs 7, 10 ).................................................... 4

4 Irregularly outlined yellowish-brown markings on elytral humeri extend across 3/5 of elytral base ( Fig. 1 ); median lobe in dorsal view with apical process rounded laterally ( Fig. 7 ), in lateral view less curved; body length 5.6–6.6 mm; Laos (Houaphanh).......................................................................... G. jolantae new species

- Irregularly outlined yellowish-brown markings on the elytral humeri extend across 1/3 to 3/5 of the elytral base ( Fig. 5 ); median lobe in dorsal view with apical process angulate laterally ( Fig. 10 ), in lateral view more curved; body length 5.9–7.8 mm; China (Taiwan) ........................................................................... G. kamikawai (Chûjô)

Figures

FIGURES 3–4. Gonioctena lukasi new species, male holotype. 3: dorsal habitus, 4: lateral habitus. Scale bar: 1.0 mm.

FIGURES 1–2. Gonioctena jolantae new species, male holotype. 1: dorsal habitus, 2: lateral habitus. Scale bar: 1.0 mm.

FIGURES 5–6. Dorsal habitus. 5: Gonioctena kamikawai (Chûjô, 1958) 6: G. fujiana Cho & Borowiec, 2016. Scale bars: 1.0 mm.

FIGURES 7–11. Gonioctena species, male genitalia. 7: G. jolantae new species (dorsal, apico-dorsal & lateral), 8: G. lukasi new species (dorsal & lateral), 9: G. kanfani (Chen, 1941) (apico-dorsal & lateral, redrawn from Yang et al. 2014), 10: G. kamikawai (Chûjô, 1958) (dorsal, apico-dorsal & lateral), 11: G. fujiana Cho & Borowiec, 2016 (dorsal, apico-dorsal & lateral). Scale bars: 1.0 mm.