| The family Baetidae is the most diverse family into the Order Ephemeroptera and it has an almost cosmopolitan distribution. The genus Americabaetis Kluge was described in 1992 and actually it has 19 known species with a clearly Neotropical distribution. Although this genus is very common in lotic aquatic systems, it has been poorly studied in Argentina. Herein, we report four species for this country originally described from Brazil, Paraguay and Uruguay: A. labiosus Lugo-Ortiz & McCafferty, A. longetron Lugo-Ortiz & McCafferty, A. mecistognathus Salles & Raimundi, A. titthion Lugo-Ortiz & McCafferty. |
