Abstract
In the present paper, based on the rearing of nymphs in the field, we present for the first time the description of the adult stage of Rivudiva Lugo-Ortiz and McCafferty and of its type species, R. minnatena Lugo-Ortiz and McCafferty. Adults of Rivudiva can be distinguished from the other genera of Baetidae by the following combination of characters: (1) hindwings present or absent, when present with two longitudinal veins and with costal projection pointed, placed in the basal fourth of anterior margin; (2) forceps three- segmented, segment III long, about 2r as long as wide; (3) distal margin of subgenital plate with small poin- ted projection. Besides that, R. coveloae (Traver, 1971 (Proc. Entomol. Soc. Washington, 73, 58-63)), new combination, and R. venezuelensis (Traver, 1943 (Bol. Entomol. Venezolana, 2, 79-98)), new combination, are proposed based on the characteristics listed above, specially the distal margin of subgenital plate with a small pointed projection. Comments on the biology of the nymphs are also provided.
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