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The genus Camelobaetidius has 38 valid species distributed throughout the Neotropical and Neartic Regions. The incomplete descriptions of some species of the genus, and the vast morphological variation among some specimens, makes the identification at specific level difficult in some cases. Currently there are eight species of the genus in which the nymphs possess the terminal filament reduced, all of them restricted to South America. The aim of this study was to review these species of Camelobaetidius. Camelobaetidius apis is considered a junior synonym of C. billi. The nymphs of six species are redescribed: C. billi, C. francischettii, C. ipaye, C. leentvaari, C. maranhensis and C. rufiventris. No specimen of Camelobaetidius mantis was studied, and the male imago of C. billi is redescribed. A key for the species of Camelobaetidius with reduced terminal filament is presented. [ABSTRACT FROM PUBLISHER]

The genus Camelobaetidius Demoulin, 1966 has 39 species distributed throughout the Nearctic and Neotropical Regions, being one of the most studied genera of the family Baetidae. Based on material from Brazil, the aim of the present paper is to describe adults of C. janae Dominique & Thomas, 2001 and C. yacutinga Nieto, 2003, and to recognize a new synonym for Camelobaetidius leentvaari Demoulin, 1966 (= C. mantis Traver & Edmunds, 1968 nov. syn.) based on the examination of type material.