Coenagrionidae

Lozano, Federico, Muzón, Javier & Torres, Sabrina, 2009, Description of the final instar larva of Homeoura lindneri (Ris, 1928) and redescription of the larva of H. chelifera (Selys, 1876) (Odonata: Coenagrionidae), Zootaxa 2231, pp. 47-54 : 52

Key to final instar larvae of most common genera of Coenagrionidae from Argentina

There are 15 genera known from Argentina (von Ellenrieder 2008; von Ellenrieder & Muzón 2008; Garrison 2009). In the key below we exclude three of them ( Aeolagrion , Antiagrion and Tigriagrion ) because there are no descriptions of the final instar larvae for the species recorded from Argentina.

1 Anterior margin of labial palp not bilobate ................................................................................................................. 2

- Anterior margin of labial palp bilobate; bromeliad-dwelling larvae ........................................................... Leptagrion

2 Anterior margin of labial palp with teeth..................................................................................................................... 3

- Anterior margin of labial palp without teeth .................................................................................................. Telebasis

3 Caudal lamellae shorter than abdomen........................................................................................................................ 4

- Caudal lamellae longer than abdomen .................................................................................................... Acanthagrion

4 Total length of larvae excluding caudal lamellae more than 9 mm ............................................................................ 5

- Total length of larvae excluding caudal lamellae less than 6 mm ........................................................... Argentagrion

5 Premental setae present ............................................................................................................................................... 6

- Premental setae absent .......................................................................................................................................... Argia