Oxyallagma

Bota, Cornelio Andrés, 2014, A brief look at the Odonata from the Páramo ecosystems in Colombia, with the descriptions of Oxyallagma colombianum sp. nov. and Rhionaeschna caligo sp. nov. (Odonata: Coenagrionidae, Aeshnidae, Libellulidae), Zootaxa 3856 (2), pp. 192-210 : 197

Key to species of Oxyallagma

Reference to the illustrations of O. dissidens in Garrison et al. (2010) is important in order to accurately identify these species.

1. Females............................................................................................ 2

1’. Males............................................................................................. 3

2 (1). S2 – 6 with middorsal black stripe, S9 with light blue middorsal stripe ( Fig. 4 c); cercus ivory white; middorsum of posterior lobe of pronotum strongly bent dorsally (Northern Peru, Ecuador, and Southern Colombia).................. O. dissidens

2’. No middorsal black stripe on S2 – 6, nor light blue middorsal stripe on S9 ( Figs. 5 b, d); cercus dark brown; middorsum of pos- terior lobe of pronotum only slightly bent dorsally ( Fig. 6 a) (Northern Colombia)...................... O. colombianum

3 (1’). Genital ligula without small latero-medial pointed lobes; paraproct with swollen semicircular ventral branch as wide as cercus; cercus with two short ventroapical processes (Northern Peru, Ecuador, and Southern Colombia).............. O. dissidens

3’. Genital ligula with small latero-medial pointed lobes ( Fig. 6 b); paraproct with ventral branch not swollen, narrower than half of cercus ( Figs. 6 c – d); cercus with one ventroapical process ( Fig. 6 d) (Northern Colombia).............. O. colombianum

Figures

FIGURE 4. (a) Ischnura ramburii female (Páramo El Morro). (b) Oxyallagma colombianum, teneral male (Antioquia, Labores). Oxyallagma dissidens: (c) Female (Nariño, La Cocha); (d) Male (Cauca, Silvia).

FIGURE 5. Oxyallagma colombianum: (Páramo Sabanas): (a) Pair in wheel position; (b) Tandem pair; (Antioquia, Labores): (c) Ovipositing pair with microparasitoid close to the oviposition place; (d) Tandem pair (photograph by Cintia Moreno).

FIGURE 6. Oxyallagma colombianum (Páramo Sabanas): Female paratype: (a) Dorsal view of pronotum posterior lobe and mesostigmal plates. Male paratype (Páramo Las Baldías): (b) Ectal view of genital ligula; (c) Lateral view of caudal appendages; (d) Medio - dorsal view of caudal appendages. l-m. l.: Latero-medial lobes. m. p.: Mesostigmal plates. p. p. l.: Pronotum posterior lobe. e. v – ap. p.: Ventroapical external process. v – b t.: Ventrobasal tooth. i. d. p.: Inner dorsal process. p. d. b.: Paraproct dorsal branch. p. v. b.: Paraproct ventral branch. Illustrations by Natalia Uribe Macias.