Negragrion sagma gen.n. and sp.n. from South America with a morphological phylogeny of the New World Ischnurinae (Odonata: Zygoptera: Coenagrionidae).

A new coenagrionid genus, Negragrion, is described for N. sagma sp.n.

Description of the final instar larva of Argia serva Hagen in Selys, 1865 (Odonata Coenagrionidae).

The American genus Argia, with more than 100 species described, is the most speciose genus of Odonata in the world. In this contribution, the final stadium larva of Argia serva, the southernmost distributed species of Argia, is described and diagnosed based on reared material from Martín García island, Buenos Aires, Argentina. The larva of this species can be easily separated from the other Argentinean Argia by the following combination of characters: sternum of S8 covered with spines (bare in A.

Acanthagrion marinae sp. nov. (Zygoptera: Coenagrionidae): a new species of the apicale group.

Acanthagrion marinae sp. nov. (Holotype male: BRASIL, Mato Grosso do Sul, Campo Grande, UFMS, 20°29'56.

The Odonata (Insecta) of Patagonia: a synopsis of their current status with illustrated keys for their identification.

Patagonia is a vast landmass with a distinctive environmental and biotic heterogeneity. Its Odonata biodiversity is the best known of South America, and it is composed of 36 species, of which more than 50% are endemic. We summarize the main taxonomic, distributional and biological information including illustrated keys for adults and known larvae, and distributional maps.

Description of three females of the genus Acanthagrion (Odonata: Coenagrionidae) with a key to the females of Argentina.

The neotropical genus Acanthagrion Selys (Odonata: Coenagrionidae) is composed of 44 species, of which the females of 31 species are currently known. In this contribution the females of A. aepiolum Tennessen and A.