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Diagnoses and discussion of the group 1 and 2 Brazilian species of Heteragrion, with descriptions of four new species (Odonata: Megapodagrionidae)

. Zootaxa. 3685, 1 (Jul. 2013), 1–80. DOI:https://doi.org/10.11646/zootaxa.3685.1.1.