Navicordulia, MACHADO & COSTA, 1995

Fleck, Günther & Juillerat, Laurent, 2019, The genus Navicordulia Machado & Costa, 1995 (Insecta, Odonata, Corduliidae s. str.): new species, identification key for males and data on ecology and distribution, Zoosystema 41 (27), pp. 553-565 : 559-560

SPECIES KEY TO MALES NAVICORDULIA MACHADO & COSTA, 1995

The core of this key is based on the work Machado & Costa (1995) and couplet five springs with little changes from Pinto & Lamas (2010).

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 brush of long hairs directed dorsally, laterally or ventrally (Group longistyla ) ........................................................................................................................................ 2

— Cerci (superior appendages) short 1.6-2.0 mm. Epiproct (inferior appendage) almost as long to distinctly longer than cerci. Distal half of cerci without a brush of long hairs directed dorsally, laterally or ventrally (sparse 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 Fleck, 2017

— 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 ( De Marmels, 1991)

— Cerci in lateral view with the proximal carinated part about as long or distinctly shorter than the distal noncarinated 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 Machado & Costa, 1995

— 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 c. 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 Machado & Costa, 1995

— 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 c. 0.62). Postfrons with metallic blue reflections differing from largely metallic green thorax [Santa Catarina State in Brazil] ......................................................................... N. aemulatrix Pinto & Lamas, 2010

6. Cerci in lateral view with a large basal ventral tooth .............................................................. N. pascali n. sp. — Cerci in lateral view without basal ventral tooth .......................................................................................... 7

7. Epiproct distinctly longer than cerci ....................................................... N. mielkei Machado & Costa, 1995 — Epiproct about as long as cerci or slightly shorter ........................................................................................ 8 8. Cerci with ventro-lateral tubercle. Genital lobe triangular or quadrangular ................................................. 9 — 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 ( De Marmels, 1991)

— Proximal carinated part of cerci twice as long as the distal non-carinated one. Genital lobe quadrangular ....... ............................................................................................................. N. atlantica Machado & Costa, 1995

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 (Calvert, 1909)

— 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 Machado & Costa, 1995 .