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Analysis of some historically unfamiliar Canadian mayflies (Ephemeroptera)

Published online by Cambridge University Press:  31 May 2012

Luke M. Jacobus  and
W.P. McCafferty
Luke M. Jacobus*
Affiliation:
Department of Entomology, Purdue University, West Lafayette, Indiana, United States 47907-1158
W.P. McCafferty
Affiliation:
Department of Entomology, Purdue University, West Lafayette, Indiana, United States 47907-1158
*
1Corresponding author (e-mail: [email protected]).
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Abstract

Twelve historically unfamiliar Ephemeroptera species described from Canada over 65 years ago were studied. Diagnostic characters are given that validate Acerpenna akataleptos (McDunnough) (Baetidae), whereas certain larval specimens of the genus Acerpenna Waltz and McCafferty cannot yet be associated with any species. Cinygmula confusa (McDunnough, 1924), syn.nov., (Heptageniidae) is shown to be a junior synonym of Cinygmula par (Eaton, 1885), and Serratella serratoides (McDunnough, 1931), syn.nov., (Ephemerellidae) is shown to be a junior synonym of Serratella molita (McDunnough, 1930). New distribution records are given for Ironodes flavipennis Traver (Heptageniidae), Cinygmula gartrelli McDunnough, Heptagenia adaequata McDunnough (Heptageniidae), and Siphlonurus autumnalis McDunnough (Siphlonuridae), including the first substantiated records for the latter three from the United States. A first larval description of S. autumnalis is provided. Ephemerella fratercula McDunnough (Ephemerellidae) is apparently rare, but its previously doubtful North Carolina record is confirmed. All larvae previously reported as Neoephemera bicolor McDunnough (Neoephemeridae) cannot be placed to any nominal species. Parameletus croesus (McDunnough) (Siphlonuridae), Plauditus rubrolateralis (McDunnough) (Baetidae), and Rhithrogena gaspeensis McDunnough (Heptageniidae) are distinctive species but are known from few records.

Résumé

Douze espèces rares d’éphéméroptères décrites au Canada il y a plus de 65 ans et jusqu’alors mal identifiées ont été étudiées. Grâce à des caractères diagnostiques le spécimen Acerpenna akataleptos (McDunnough) (Baetidae) a été validé, tandis que certains spécimens larvaires du genre Acerpenna Waltz et McCafferty ne peuvent encore être associés à aucune espèce. Il est montré : que Cinygmula confusa (McDunnough, 1924), syn.nov., (Heptageniidae) est un synonyme plus récent de Cinygmula par (Eaton, 1885) et que Serratella serratoides (McDunnough, 1931), syn.nov., (Ephemerellidae) est un synonyme plus récent de Serratella molita (McDunnough, 1930). De nouvelles localités viennent s’ajouter aux répartitions d’Ironodes flavipennis Traver (Heptageniidae), Cinygmula gartrelli McDunnough, Heptagenia adaequata McDunnough (Heptageniidae) et Siphlonurus autumnalis McDunnough (Siphlonuridae); ces trois dernières espèces sont signalées pour la première fois aux Etats-Unis. Une première description larvaire de S. autumnalis est donnée. Ephemerella fratercula McDunnough (Ephemerellidae) est rare apparemment, mais sa présence douteuse en Caroline du Nord est confirmée. Touts les larves antérieurement citées sous le nom de Neoephemera bicolor McDunnough (Neoephemeridae) n’ont pu être attribuées à aucune espèce nominale. Parameletus croesus (McDunnough) (Siphlonuridae), Plauditus rubrolateralis (McDunnough) (Baetidae) et Rhithrogena gaspeensis McDunnough (Heptageniidae) sont des espèces distinctes mais qui demeurent encore peu connues.

Type
Articles
Information
The Canadian Entomologist , Volume 134 , Issue 2 , April 2002 , pp. 141 - 155
Copyright
Copyright © Entomological Society of Canada 2002

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