Baetidae (Insecta, Ephemeroptera) from Roraima, Brazil: new records and a key to genera and species at nymphal stage. Roraima is one of the Brazilian states where least is known regarding the family Baetidae; to date only four species have been recorded from the state. The aim of the present study is to improve knowledge of the family in Roraima based on collections that are mainly from northeastern and southeastern portions of the state. Thirty-two species were found; of this total, 14 are new records for the entire Northern Region of Brazil, and four species are new for the country (Camelobaetidius ortizi Dominique & Thomas, 2002, Cloeodes barituensis Nieto & Richard, 2008, Paracloeodes pacawara Nieto & Salles, 2006 and Waltzoyphius roberti Thomas & Peru, 2002). Except for Moribaetis Waltz & McCafferty, 1985, Tomedontus Lugo-Ortiz & McCafferty, 1995, Tupiara Salles, Lugo-Ortiz, Da-Silva & Francischetti, 2003 and Varipes Lugo-Ortiz & McCafferty, 1998, all of the remaining genera that had been recorded from Brazil were found. One genus and one Cryptonympha species were found to be new to science.
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