Vanuatubasis, Ober & Staniczek, 2009

Ober, Stefan V. & Staniczek, Arnold H., 2009, A new genus and species of coenagrionid damselflies (Insecta, Odonata, Zygoptera, Coenagrionidae) from Vanuatu, Zoosystema 31 (3), pp. 485-497 : 495

KEY TO THE MALES OF VANUATUBASIS N. GEN.

1. Superior anal appendages ovate in dorsal view, each with two acute, shiny black teeth at the posterior margin ( Fig. 4A, D ); median process at posterior margin of each mesostigmal lamina situated in the middle of mesanepisternum ........................... V. bidens n. comb.

— Superior anal appendages more elongated in dorsal view, with acute outer tip directed posteriorly; median process at posterior margin of each mesostigmal lamina situated closer to the dorsal carina ..................................................................................................... 2

2. Superior anal appendages crescent-like in dorsal view, inner angle acute, extended posteriorly ( Fig. 4B, E ); upper pronotal hind ridge sinusoidally shaped, only slightly raised, lower ridge protruding posteriorly, median keel between upper and lower rim distinct; median process at the posterior margin of each mesostigmal lamina strong and roughly quadrangular ( Fig. 5A ) ............................................................ V. malekulana n. comb.

— Superior anal appendages roughly paisley-shaped in dorsal view, inner posterior angle flattened, not extended posteriorly ( Fig. 4C, F ); upper pronotal hind ridge only slightly curved, raised, lower ridge not or only slightly protruding posteriorly, median keel between upper and lower rim only faintly pronounced; median process at the posterior margin of each mesostigmal lamina small and rounded ( Fig. 5B ) ..................... V. santoensis n. sp.

Figures

FIG. 4. — A, D, G, J, Vanuatubasis bidens (Kimmins, 1958) n. comb., holotype,♂ (BMNH), anal appendages in dorsal and lateral view; B, E, H, K, V.malekulana (Kimmins,1936) n. comb.,holotype,♂ (BMNH),anal appendages in dorsal and lateral view;C, F, I, L, V.santoensis n. gen., n. sp., holotype, ♂ (SMNS: ODO 000242 K), anal appendages in dorsal and lateral views. Scale bars: 0.2 mm.

FIG. 5. — A, Vanuatubasis malekulana (Kimmins,1936) n. comb.,paratype,♂ (BMNH),hind lobe of pronotum and mesostigmal laminae in dorsal view; B, V. santoensis n. gen., n. sp., holotype, ♂ (SMNS: ODO 000242 K), hind lobe of pronotum and mesostigmal laminae in dorsal view. Scale bar: 0.2 mm