Taxonomia de Baetidae Leach, 1815 (Insecta: Ephemeroptera) do estado de Roraima, Brasil

Abstract

Roraima is one of the Brazilian states with the most unknown Baetidae fauna and is therefore a high-priority area for documentation of these small minnow mayflies. In order to study and document this family in Roraima, 56 streams and rivers, especially in the northeastern and southeastern portions of the state, were sampled in November 2006 and February 2007. In addition, the small minnow mayfly material of the Invertebrate Collection at INPA was analyzed. A total of 32 species were found, with 14 new records for the Northern Region of Brazil, increasing to 35 the number of documented species. Descriptions are provided here of one new genus and two new species. The adults of Cryptonympha copiosa Lugo-Ortiz & McCafferty, 1998, Harpagobaetis gulosus Mol, 1986, Tomedontus primus Lugo-Ortiz & McCafferty, 1995 (from Amazonas) and Zelusia principalis Lugo-Ortiz & McCafferty, 1998 are morphologically described for the first time. The species Aturbina beatrixae Gillies, 2001, Camelobaetidius ortizi Dominique & Thomas, 2002, Cloeodes barituensis Nieto & Richard, 2008, Paracloeodes pacawara Nieto & Salles, 2006 and Waltzoyphius roberti Thomas & Peru, 2002 represent new Brazilian records. Within the genera previously reported in the country, Moribaetis Waltz & McCafferty, 1985, Tomedontus Lugo-Ortiz & McCafferty, 1995, Tupiara Salles et al., 2003 and Varipes Lugo- Ortiz & McCafferty, 1998 where the only ones not found in Roraima. Baetodes Needham & Murphy, Callibaetis Eaton, 1981, Cloeodes Traver, 1938, Harpagobaetis Mol, 1986 and Rivudiva Lugo-Ortiz & McCafferty, 1998 are recorded for the first time for the Northern Region. A checklist and an identification key are provided for the nymphs of the species known to occur in Roraima.