Three names, one species: junior synonyms for the Atlantic Forest emerald dragonfly Navicordulia atlantica (Odonata: Corduliidae s.s.)

Three Atlantic Forest endemic species of emerald dragonflies the genus Navicordulia Machado & Costa, 1995 are reviewed through a morphological comparative analysis. All name-bearing types and additional specimens atlantica-complex—Navicordulia atlantica 1995, mielkei miersi 1995—were investigated to assess their taxonomic nomenclatural status. Based on our results hypothesis these three nomina corresponding distinct is no longer supported. The proportional size caudal appendages, an crossvein in cubito-anal space hind wing, as well minor differences coloration pterostigma not reliable diagnostic characters for supporting specific We consider simultaneously available synonyms, by action first reviser, selected valid nomen, hence N. syn. nov. subjective junior synonyms. Photos, other illustrations, new species-level diagnosis given. Despite advances knowledge Navicordulia, second species-rich corduliid Neotropical region, status some still necessitates full revision.