The nymphs of the genus Camelobaetidius Demoulin (Ephemeroptera : Baetidae) in Brazil : new species, new records, and key for the identification of the species

摘要

Three new species of Camelobaetidius Demoulin (Ephemeroptera : Baetidae), C hamadae sp. n., C. lassance sp. n., and C maranhensis sp. n., are described based on nymphs from Brazil. Some of the diagnostic characters of the new taxa are : C. hamadae sp. n., two thoracic gills at base of forelegs and claws with 36-37 denticles; C. lassance sp. n., claws with approximately 60 denticles and posterior margin of terga with few, large and elevated spines; C. maranhensis sp. n., pronotum with medial pair of tubercles and terminal filament shorter than 10th abdominal segment. Camelobaetidius cayumba (Traver & Edmunds), C. matilei Thomas & Peru. and C. tuberosus Lugo-Ortiz & McCafferty, are recorded for the first time from Brazil. A key to the species of Camelobaetidius recorded from Brazil based on nymphs is presented.