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South American species of small minnow mayflies (Insecta : Ephemeroptera : Baetidae) that have been previously placed in Baetis Leach or Pseudocloeon Klapálek are revised. Species that resided in Baetis are shown to include Camelobaetidius alcyoneus, n. comb., C. coveloae, n. comb., C. dryops, n. comb., C. tantillus, n. comb., Cloeodes nocturnus, n. comb., C. stelzneri, n. comb., Fallceon inops, n. comb., F. murphyae, n. comb., F. yaro, n. comb., Moribaetis aneto, n. comb., M. comes, n. comb., and M. socius, n. comb. Species that resided in Pseudocloeon are shown to include Americabaetis albinervis, n. comb., A. bridarolli, n. comb., A. bruchi, n. comb., A. jorgenseni, n. comb., A. oldendorffi, n. comb., A. peterseni, n. comb., A. weiseri, n. comb., Cloeodes turbinops, n. comb., and C. venezuelensis, n. comb. The bases of the revisions are discussed under each species. The presence of Fallceon and Moribaetis in South America is confirmed for the first time.

South American species of small minnow mayflies (Insecta : Ephemeroptera : Baetidae) that have been previously placed in Baetis Leach or Pseudocloeon Klap?lek are revised. Species that resided in Baetis are shown to include Camelobaetidius alcyoneus, n. comb., C. coveloae, n. comb., C. dryops, n. comb., C. tantillus, n. comb., Cloeodes nocturnus, n. comb., C. stelzneri, n. comb., Fallceon inops, n. comb., F. murphyae, n. comb., F. yaro, n. comb., Moribaetis aneto, n. comb., M. comes, n. comb., and M. socius, n. comb. Species that resided in Pseudocloeon are shown to include Americabaetis albinervis, n. comb., A. bridarolli, n. comb., A. bruchi, n. comb., A. jorgenseni, n. comb., A. oldendorffi, n. comb., A. peterseni, n. comb., A. weiseri, n. comb., Cloeodes turbinops, n. comb., and C. venezuelensis, n. comb. The bases of the revisions are discussed under each species. The presence of Fallceon and Moribaetis in South America is confirmed for the first time.Les esp?ces Sud-Am?ricaines d'Eph?m?res Pisciforma (Ephemeroptera : Baetidae) qui ont ?t? auparavant class?es dans les genres Baetis Leach ou Pseudocloeon Klap?lek sont r?vis?es. Il est montr? que les esp?ces regroup?es sous Baetis incluent Camelobaetidius alcyoneus, n. comb., C. coveloae, n. comb., C. dryops, n. comb., C. tantillus, n. comb., Cloeodes.nocturnus, n. comb., C. stelzneri, n. comb., Fallceon inops, n. comb., F. murphyae, n. comb., F. yaro, n. comb., Moribaetis aneto, n. comb., M. comes, n. comb., and M. socius, n. comb. Il est aussi montr? que les esp?ces regroup?es sous Pseudocloeon incluent Americabaetis albinervis, n. comb., A. bridarolli, n. comb., A. bruchi, n. comb., A. jorgenseni, n. comb., A. oldendorffi, n. comb., A. peterseni, n. comb., A. weiseri, n. comb., Cloeodes turbinops, n. comb., and C. venezuelensis, n. comb. Les bases des r?visions sont argument?es pour chaque esp?ce. La pr?sence de Fallceon et de Moribaetis en Am?rique du Sud est confirm?e pour la premi?re fois.

The genus Paracloeodes (Insecta : Ephemeroptera : Baetidae) is newly reported from South America. Because of the discovery of species with hindwings and other characteristics not previously associated with Paracloeodes, a redescription of the genus is provided. Cladistic data suggest a South American center of origin for this Panamerican genus. Paracloeodes binodulus, n. sp., is described from larvae from northern Brazil, and is distinguished by the lack of hindwingpads and presence of small mesonotal tubercles. Paracloeodes eurybranchus n. sp., is described from larvae and female adults from north-central Argentina and southeastern Brazil; it is distinguished as larvae by the relatively large size, hindwingpads, and medially broad gills. Paracloeodes ibicui, n. sp., is described from a mature larva collected from Paraguay, and is distinguished by hindwingpads and abdominal coloration. Paracloeodes leptobranchus, n. sp., is described from larvae from Paraguay and southeastern Brazil, and is distinguished by relatively large size, hindwingpads, and slender gills.

The genus Paracloeodes (Insecta : Ephemeroptera : Baetidae) is newly reported from South America. Because of the discovery of species with hindwings and other characteristics not previously associated with Paracloeodes, a redescription of the genus is provided. Cladistic data suggest a South American center of origin for this Panamerican genus. Paracloeodes binodulus, n. sp., is described from larvae from northern Brazil, and is distinguished by the lack of hindwingpads and presence of small mesonotal tubercles. Paracloeodes eurybranchus n. sp., is described from larvae and female adults from north-central Argentina and southeastern Brazil; it is distinguished as larvae by the relatively large size, hindwingpads, and medially broad gills. Paracloeodes ibicui, n. sp., is described from a mature larva collected from Paraguay, and is distinguished by hindwingpads and abdominal coloration. Paracloeodes leptobranchus, n. sp., is described from larvae from Paraguay and southeastern Brazil, and is distinguished by relatively large size, hindwingpads, and slender gills.Le genre Paracloeodes (Insecta : Ephemeroptera : Baetidae) est signal? pour la premi?re fois en Am?rique du Sud. En raison de la d?couverte d'esp?ces pr?sentant des ailes post?rieures ainsi que d'autres caract?res non associ?s jusqu'ici avec la d?finition de Paracloeodes, une redescription de ce genre est propos?e. Des donn?es cladistiques sugg?rent un centre d'origine Sud-Am?ricain pour ce genre Panam?ricain. Paracloeodes binodulus, n. sp., est d?crit ? partir de larves provenant du Br?sil septentrional, et se distingue par l'absence de fourreaux alaires post?rieurs et la pr?sence de petits tubercules m?sonotaux. Paracloeodes eurybranchus n. sp., est d?crit ? partie de larves et d'adultes femelles provenant du Centre-Nord de l'Argentine et du Sud-Est du Br?sil; les larves se distinguent par leur taille relativement ?lev?e, leurs fourreaux alaires post?rieurs et leurs branchies ?largies dans la r?gion m?diane. Paracloeodes ibicui, n. sp., est d?crit ? partir d'une larve mature r?colt?e au Paraguay, et se distingue par ses fourreaux alaires post?rieurs et sa coloration abdominale. Paracloeodes leptobranchus n. sp., est d?crit ? partir de larves provenant du Paraguay et du Sud-Est du Br?sil, et se distingue par sa taille relativement grande, ses fourreaux alaires, et ses branchies ?troites.