Perigomphus, Belle, 1972

Amaya-Vallejo, Vanessa, Novelo-Gutiérrez, Rodolfo & Realpe, Emilio, 2017, Perigomphus basicornis sp. nov. (Odonata: Gomphidae) from Anchicayá, Colombia, Zootaxa 4294 (3), pp. 395-400 : 398

Key to adult males of Perigomphus

1 Extreme base of cerci subequal in width to the space between them ( Fig. 4 ); mesal carinate margin of cerci entire, not notched subapically ( Figs. 4, 5 )......................................................................... basicornis

- Extreme base of cerci notoriously shorter than space between them; mesal carinate margin of cerci notched subapically ( Figs. 8, 10 )............................................................................................... 2

2 Cerci in dorsal view with the medial angle at extreme base projected toward midline and almost meeting that of opposite in each cercus ( Fig. 8 ); in lateral view ( Fig. 9 ) with a vestigial sub-basal projection............................. angularis

- Cerci in dorsal view ( Fig. 10 ) with the medial margin at extreme base undeveloped and slightly undulate; in lateral view ( Fig. 11 ) with a well-developed sub-basal projection..................................................... pallidistylus

Figures

FIGURES 4 – 7. Perigomphus basicornis sp. nov., holotype ♂. 4) Dorsal view of S 9 – 10 showing the caudal appendages. 5) Left latero-dorsal view of caudal appendages. 6) Left lateral view (slightly ventral) of caudal appendages. 7) S 8 – 10 and caudal appendages, ventral view. a = arm of epiproct, Ah = anterior hamuli, Ce = cerci, Ep = epiproct, p = baso-lateral process of cerci, Ph = posterior hamulus. Pr = dorsolateral process of paraproct, sbvh = sub-basal ventral horn of cerci.

FIGURES 8 – 11. Perigomphus spp. 8) Dorsal view of S 10 and caudal appendages of male of P. angularis; 9) the same, lateral view; 10) Dorsal view of S 10 and caudal appendages of male of P. pallidistylus; 11) the same, lateral view. a = arm of epiproct, Ce = cerci, Ep = epiproct, ma = medial angle, p = baso-lateral process of cerci, Pr = dorsolateral process of paraproct, san = subapical notch, sbvp = sub-basal ventral projection of cerci. Figs. 8 – 9 after Tennessen (2011); Figs. 10 – 11 after Belle (1972).