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Anjos-Santos, D., Carriço, C., Costa, J.M. and Santos, T.C. 2011. Description of the final instar larvae of Acanthagrion gracile (Rambur) and Acanthagrion lancea Selys (Odonata: Coenagrionidae). Zootaxa. 2832, 1 (Apr. 2011), 44–50. DOI:https://doi.org/10.11646/zootaxa.2832.1.2.