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Ramírez, A. and Gutiérrez-Fonseca, P.E. 2013. The larvae of Heteragrion majus Selys and H. atrolineatum Donnelly, with a key to known species from Costa Rica (Odonata: Megapodagrionidae). Zootaxa. 3609, 1 (Jan. 2013), 96–100. DOI:https://doi.org/10.11646/zootaxa.3609.1.8.