FIGURES 1–12. Segesta riograndensis n in Segesta riograndensis, new genus and species of an Atalophlebiinae (Ephemeroptera: Leptophlebiidae) mayfly from southern Brazil

FIGURES 1–12. Segesta riograndensis n. sp.: 1, labrum, left dorsal view, right ventral view. 2, anteromedian emargination of labrum; 3, left mandible, dorsal view. 4, right mandible, dorsal view. 5, right mandible, partial, ventral view. 6, mandibles details; left and right incisors and prostheca. 7, maxillae, ventral view. 8, maxillary palp, detail, dorsal view. 9, pectinate setae of galealacinia, ventral view. 10, hypopharynx, left ventral view, right dorsal view. 11, labium, left ventral view, right dorsal view, some setae omitted. 12, segment 3 of labial palp.