Navicordulia Machado & Costa 1995

Species key to males Navicordulia The core of this key is based on the publication of Machado & Costa (1995) and takes into account the more recent works of Pinto & Lamas (2010), Fleck & Juillerat (2019), and Pinto et al. (2022). 1. Cerci (superior appendages) long to very long 2.5–3.9 mm. Epiproct (inferior appendage) distinctly shorter than cerci. Distal half of cerci provided with a distinct brush of long hairs directed dorsally, laterally, or ventrally (Group longistyla)........ 2 1’. Cerci (superior appendages) short 1.6–2.0 mm. Epiproct (inferior appendage) not distinctly shorter than cerci [almost as long to distinctly longer than cerci; slightly shorter in N. pascali)]. Distal half of cerci without a distinct brush of long hairs directed dorsally, laterally, or ventrally (setae present) (Group errans)................................................... 6 2. Cerci in lateral view with a distinct median dorsal large concavity occupying about 2/10 of the length of the cerci followed distally by a long convexity occupying about 1/2 of the length of the cerci. Length of cerci> 3.5 mm ..... N. tumucurakensis 2’. Cerci in lateral view without distinct median dorsal large concavity followed distally by a long convexity. Length of cerci <3.5 mm ................................................................................................ 3 3. Cerci in lateral view with the proximal carinated part distinctly longer than the distal non-carinated one, in dorsal view with a distinct external concavity at the distal third. Genital lobe triangular....................................... N. nitens 3’. Cerci in lateral view with the proximal carinated part about as long or distinctly shorter than the distal non-carinated one, in dorsal view without distinct external concavity. Genital lobe quadrangular........................................ 4 4. Dorso-basal tubercle poorly developed and ventrolateral tubercle vestigial to absent. Ventro-medial tubercle visible in dorsal view. Maximum width of abdomen between S7 and S8 2.3 –2.4 mm [Distrito Federal in Brazil].............. N. longistyla 4’. Dorso-basal and ventro-lateral tubercles developed, the latter partially visible in dorsal view. Ventro-medial tubercle poorly developed, not visible in dorsal view. Maximum width of abdomen between S7 and S8 2.8 –3.0 mm.................... 5 5. Cerci in lateral view with carinated part as long as the non-carinated (ratio of carinated part / total length of cercus ca 0.48). Cerci slightly longer than epiproct (ratio between epiproct / total length of cercus ≥ 0.77). Postfrons with metallic green reflections similar to that of thorax [Minas Gerais State in Brazil]........................................ N. kiautai 5’. Cerci in lateral view with carinated part distinctly shorter than non-carinated (ratio of carinated part / total length of cercus ≤ 0.33). Cerci distinctly longer than epiproct (maximum ratio between epiproct / total length of cercus ca 0.62). Postfrons with metallic blue reflections differing from largely metallic green thorax [Santa Catarina State in Brazil]......... N. aemulatrix 6. Cerci in lateral view with a large basal ventral tooth................................................... N. pascali 6’. Cerci in lateral view without basal ventral tooth............................................................. 7 7. Distal lateral 2/10 of the cerci in dorsal view with an abrupt and strong S-shaped undulation, the deflection being> 0.8 cercus width taken just distal to deflection (cf Fig. 15)................................................ N. tangoyi sp. nov. 7’. Distal lateral 2/10 of the cerci in dorsal view without an abrupt and strong S-shaped undulation....................... 8 8. Cerci with ventro-lateral tubercle. Genital lobe triangular or quadrangular........................................ 9 8’. Cerci without ventro-lateral tubercle. Genital lobe triangular.................................................. 10 9. Proximal carinated part of cerci four times as long as the distal non-carinated one. Genital lobe triangular........ N. vagans 9’. Proximal carinated part of cerci twice as long as the distal non-carinated one. Genital lobe quadrangular........ N. atlantica 10. In lateral view non-carinated part of the cerci slightly larger than carinated part. Ventral margin of carinated part concave in lateral view. Costa brown......................................................................... N. errans 10’. In lateral view non-carinated part of the cerci slightly narrower than carinated part. Ventral margin of carinated part straight in lateral view. Costa white....................................................................... N. leptostyla