ATURBINA GEORGEI GEN ET SP-N - A SMALL MINNOW MAYFLY (EPHEMEROPTERA, BAETIDAE) WITHOUT TURBINATE EYES

Aturbina (Ephemeroptera: Baetidae), gen, n., is described from a singl e species, A. georgei, sp. n., based on larvae and male and female adu lts from western Brazil, French Guiana, and Paraguay. Besides being th e first baetid mayfly known to lack the turbinate portion of the male compound eyes, the genus is distinct in that larvae possess an elongat e, distally branched seta at the base of the right prostheca and male adults have genital forceps with a distinct distomedial process on seg ment 1 and a highly reduced segment 3. Male and female adults are furt her distinguished by the possession of a small medial hump on the meta notum and a costal process with two peaks in the hindwings. The signif icance of the new baetid taxon is discussed.