Biodiversité aquatique de Madagascar 30: Le genre Cheirogenesia Demoulin, 1952 (Ephemeroptera, Palingeniidae)

Abstract

The endemic genus Cheirogenesia is poorly known and supposed to be monospecific with the single species Ch. decaryi (Navàs, 1926). Numerous collections from different regions of Madagascar led us to discover several populations of this genus. In the present paper, we redescribe Ch. decaryi from material recently collected in the suburbs of Antananarivo, as well as two new species, Ch. edmundsi sp. nov. (Mangoro basin) and Ch. laurencae sp. nov. (Rianila basin). Affinities among them are quoted. Geographical and ecological data are also presented. The most striking discovery is the fact that neither males nor females perform flight, but rather skim the water surface.