Corduliidae

Carvalho, Alcimar L., Salgado, Luiz Gustavo V. & Werneck-De-Carvalho, Pedro C., 2004, Description of a new species of Lauromacromia Geijskes, 1970 (Odonata: Corduliidae) from Southeastern Brazil, Zootaxa 666, pp. 1-11 : 9-10

Key to the adults of the genera of Corduliidae occurring in Brazil

This is a modified and updated version of the key published by Geijskes (1970), and is suited to countries of tropical South America. In order to allow the identification of males and females, preferably three venational characters were selected to be used in each step of the key. The chosen characters are not known to be sexually dimorphic in any of the known species. In this way, we expect that our key will allow undescribed male or female corduliids to be ascribed to their proper genus.

1 Subtriangle of fore wing free; triangle of hind wing slightly distad to level of arculus; apex of anal loop separated from posterior border of hind wing by two or more cells. 2

­ Subtriangle of fore wing crossed; triangle of hind wing just proximad or at level of arculus; apex of anal loop separated from posterior border of hind wing commonly by just one cell..................................................................................................................... 4

2 Two rows of cells throughout discoidal field of fore wing; anal loop elongate, reaching level of middle fork of M or more distad, bisector distinct; anal area in hind wing with 3–4 rows of cells ................................................................................. Neocordulia Selys

­ One row of cells throughout discoidal field of fore wing, widened distally to 3–4 rows; anal loop abbreviated, not or hardly passing the level of triangle, bisector not distinct; anal area in hind wing with 2 (or 3) rows of cells ......................................................... 3

3 Male epiproct quadrangular; male abdominal segment 10 without a developed middorsal keel; female ventral plate of segment 8 long, passing end of abdomen .................... ................................................................................................ Gomphomacromia Brauer

­ Male epiproct triangular; male abdominal segment 10 with a developed middorsal keel or spine; female ventral plate of segment 8 short, reaching distal limit of segment ....... .................................................................................................. Lauromacromia Geijskes

4 Supratriangles crossed; two or more cubitoanal cross­veins in fore wing; M3 and M4 undulate ........................................................................................... Aeschnosoma Selys

­ Supratriangles free; generally one cubitoanal cross­vein in fore wing; M3 and M4 not undulate.........................................................................................................................5

5 Triangle of fore wing generally free; anal loop composed by 11 to 16 cells, with two cells at its distal end; female ventral plate of segment 8 long, surpassing end of abdomen ....................................................................................... Navicordulia Machado & Costa

­ Triangle of fore wing crossed; anal loop composed by 16 to 18 cells, with three or four cells at its distal end; female ventral plate of segment 8 short, reaching distal limit of segment........................................................................................................................6

6 Sectors of arculus in hind wing not stalked; number of antenodals in fore wing 7–8; distal end of anal loop not truncate ......... Santosia Costa & Santos (females unknown)

­ Sectors of arculus in hind wing stalked; number of antenodals in fore wing 10–11; distal end of anal loop slightly truncate .............................................. Paracordulia Martin