The larva of Mecistogaster amalia (Odonata: Pseudostigmatidae)

The final larval stadium of Mecistogaster amalia is described and illustrated for the first time based on one female collected in a tree hole in Misiones province, Argentina, and compared with all known larvae of related genera. Larval morphology of Pseudostigmatidae is briefly discussed.

Odonata biodiversity of the Argentine Chaco biome

Odonates of small temporary pools, marshes, large permanent ponds, oxbow lakes, dams, and perennial rivers were sampled in the semiarid Chaco biome of NW Argentina between September 2007 and December 2008. Information from 35 localities yielded 60 species; presence/absence information of species was recorded in a spatial-relational database. Alpha, beta, and gamma diversity and total…

Five new species of Orthemis from South America (Odonata: Libellulidae)

Five new species of the levis-group of Orthemis, O. cinnamomea (holotype ♂ in USNM: Peru, Madre de Dios Department, Explorer’s Inn on Río Tambopata, 12°50′S, 69°17′W, 300 m, 23 vii 2002, leg. D. Paulson & N. Smith), O. coracina (holotype ♂ in USNM: Ecuador, Sucumbios Province, Limoncocha, 00°24′S, 76°36′W, 300 m, 23 vii 1977, leg.

Blues for the red Oxyagrion: a redefinition of the genera Acanthagrion and Oxyagrion (Odonata: Coenagrionidae)

Examination of diagnostic features for all known species of Acanthagrion and Oxyagrion shows color pattern alone not to be a reliable diagnostic character. Both genera are redefined based on morphological characters, and some color pattern characters which further aid in their diagnoses. A preliminary phylogenetic analysis indicates both genera are monophyletic. They are distinguished from…

Taxonomy of the South American genus Phyllopetalia (Odonata: Austropetaliidae)

This synopsis of adult Phyllopetalia includes the synonymy of four genera (Phyllopetalia senior subjective synonym of Rheopetalia, Odontopetalia, Eurypetalia and Ophiopetalia), four species and one subspecies (P. apicalis senior subjective synonym of Rheopetalia rex and R. apicalis decorata, and P. pudu senior subjective synonym of Ophiopetalia araucana, O. auregaster and O. Diana). P. excrescens and…

A synopsis of the South American genus Gomphomacromia (Odonata: Gomphomacromiinae)

Gomphomacromia mexicana is shown to be a junior synonym of G. chilensis based on a comparison of the holotype male with the original description of G. chilensis and specimens identified as that species from Chile. Examination of a large series of specimens from central and southern Chile and Argentina identified both as G. paradoxa and…

Revision of the subgenus Marmaraeschna (Odonata: Aeshnidae)

This revision of the subgenus Marmaraeschna includes the description of three new species: Aeshna (M.) fissifrons, A. (M.) obscura and A. (M.) brevicercia, as well as redescriptions of the previously known species, including the first description of the male of A. (M.) pallipes, a key for males and females and an updated distribution for each…