An unusual new species of Camelobaetidius (Ephemeroptera : Baetidae) from Paraguay

Camelobaetidius tuberosus, new species (Ephemeroptera: Baetidae), is descri bed from Paraguay. The species, known only in the larval stage, is distingu ished by the presence of erect, apically blunt tubercles on the pronotum an d metanotum; minute, fine, simple setae between the mandibular prosthecae a nd molae; apicomedially produced maxillary palp segment I; number of tarsal claw denticles; and abdominal coloration. The tuberculate condition is not known in other species of Camelobaetidius.