Redescription of the adults and description of the larvae and eggs of Oligoneurioides amazonicus Demoulin (Ephemeroptera: Oligoneuriidae)

Abstract

The male adults of the genus Oligoneurioides and its type species, O. amazonicus, are redescribed. The female, larva, and egg are described for the first time and the distribution of the genus is extended. Notes on the biology of the larvae are also provided. The main characters that can be used to distinguish the genus and species from the other members of the family are: adults with (1) ventral portion of head concealed by a membranous extension of the frons; (2) vein IMP of forewings absent; (3) cross veins restricted to spaces between C and Sc, R1 and R3; and (4) penis lobes sclerotised, apically curved. Larvae with (1) head strongly projected anteriorly; (2) mid and hind episterna and epimera projected laterally; (3) prominent posterolateral projections on segments II - IX. Eggs polygonal in shape, polar caps absent and surface adorned with circular rugose protuberances. © 2007 Taylor & Francis.