The genus Rivudiva Lugo-Ortiz and McCafferty (Ephemeroptera: Baetidae): First generic description of adults, new combinations, and notes on the nymphs

Issue		Ann. Limnol. - Int. J. Lim. Volume 45, Number 4, 2009


Page(s)		231 - 235
DOI		10.1051/limn/2009023
Published online		17 October 2009

Ann. Limnol. - Int. J. Lim. 45 (4) 2009 : 231-235
DOI: 10.1051/limn/2009023

The genus Rivudiva Lugo-Ortiz and McCafferty (Ephemeroptera: Baetidae): First generic description of adults, new combinations, and notes on the nymphs

Frederico Falcao Salles and Jeane Marcelle Cavalcante do Nascimento

Universidade Federal do Espírito Santo, Centro Universitário Norte do Espírito Santo, Departamento de Ciências da Saúde, Biológicas e Agrárias, São Mateus, Espírito Santo, 29933-415, Brazil

ffsalles@gmail.com

Received 26 May 2009; Accepted 7 August 2009; Published online 17 October 2009

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 2× as long as wide; (3) distal margin of subgenital plate with small pointed 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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