Analysis of some historically unfamiliar Canadian mayflies (Ephemeroptera)

Abstract

AbstractTwelve historically unfamiliar Ephemeroptera species described from Canada over 65 years ago were studied. Diagnostic characters are given that validateAcerpenna akataleptos(McDunnough) (Baetidae), whereas certain larval specimens of the genusAcerpennaWaltz and McCafferty cannot yet be associated with any species.Cinygmula confusa(McDunnough, 1924),syn.nov., (Heptageniidae) is shown to be a junior synonym ofCinygmula par(Eaton, 1885), andSerratella serratoides(McDunnough, 1931),syn.nov., (Ephemerellidae) is shown to be a junior synonym ofSerratella molita(McDunnough, 1930). New distribution records are given forIronodes flavipennisTraver (Heptageniidae),Cinygmula gartrelliMcDunnough,Heptagenia adaequataMcDunnough (Heptageniidae), andSiphlonurus autumnalisMcDunnough (Siphlonuridae), including the first substantiated records for the latter three from the United States. A first larval description ofS.autumnalisis provided.Ephemerella fraterculaMcDunnough (Ephemerellidae) is apparently rare, but its previously doubtful North Carolina record is confirmed. All larvae previously reported asNeoephemera bicolorMcDunnough (Neoephemeridae) cannot be placed to any nominal species.Parameletus croesus(McDunnough) (Siphlonuridae),Plauditus rubrolateralis(McDunnough) (Baetidae), andRhithrogena gaspeensisMcDunnough (Heptageniidae) are distinctive species but are known from few records.