New record of mayflies (Ephemeroptera, Insecta) from Maranhão State, Northeast Brazil

The State of Maranhão, located in northeastern Brazil, has a great biodiversity due to the complex of biomes that constitutes its territory. Due to the paucity of research in the area, there are gaps in knowledge of the local fauna. This work aims to contribute to the knowledge of the order Ephemeroptera. Two species of Baetidae, Callibaetis nigracyclus (Cruz et al. J Nat Hist 48:591–660, 2014) and Cloeodes auwe (Salles et al. Biota Neotrop 4:1–8, 2004a), and one species of Leptophlebiidae, Hermanella mazama (Nascimento, Mariano and Salles, 2012) are here registered from the State. It is noteworthy that the genus Cloeodes Traver 1938 and Hermanella Needham and Murphy (Lloyd Entomol Ser 24:1–79, 1924), still do not have records from the State and it is also worth mentioning that all new records represent an important geographic extension.