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LARVAE AND ADULTS OF AMELETUS MAYFLIES (EPHEMEROPTERA: AMELETIDAE) FROM ALBERTA

Published online by Cambridge University Press:  31 May 2012

Jacek Zloty  and
Gordon Pritchard
Jacek Zloty
Affiliation:
Division of Ecology, Department of Biological Sciences, The University of Calgary, Calgary, Alberta, Canada T2N 1N4
Gordon Pritchard
Affiliation:
Division of Ecology, Department of Biological Sciences, The University of Calgary, Calgary, Alberta, Canada T2N 1N4
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Abstract

Mayflies of the genus Ameletus (Ephemeroptera: Ameletidae) occur in practically every drainage of western Alberta and in the Cypress Hills, from headwater spring brooks to larger rivers. The genus is speciose and reaches its greatest diversity in the southwestern part of the province where as many as 12 species can occur at a single site. Of the 30 bisexual species currently recognized from North America, 13 have been collected from Alberta (A. bellulus, A. celer, A. cooki, A. majusculus, A. oregonensis, A. pritchardi, A. similior, A. sparsatus, A. subnotatus, A. suffusus, A. validus, A. velox, and A. vernalis), and another, A. inopinatus, is assumed to occur in the northern part of the province. Male adults of all North American species were described previously by Zloty (1996, The Canadian Entomologist128: 293–346). In the current paper, we describe late-instar larvae and adult females of all 14 Albertan species, and provide species distributions and keys for identification of male and female adults and larvae. All diagnostic taxonomic characters are described and illustrated. The identification keys can also be used in Saskatchewan, eastern British Columbia, Montana, and the northern parts of Idaho and Washington.

Résumé

Les éphémères du genre Ameletus (Ephemeroptera : Ameletidae) se retrouvent pratiquement dans tous les bassins hydrographiques de l’ouest de l’Alberta et dans les collines Cypress, des petits ruisseaux de tête aux grandes rivières. La richesse en espèces est élevée, particulièrement dans la partie sud-ouest de la province où l’on peut retrouver jusqu’à 12 espèces au même endroit. Des 30 espèces bisexuées reconnues en Amérique du Nord, 13 ont été trouvées en Alberta (A. bellulus, A. celer, A. cooki, A. majusculus, A. oregonensis, A. pritchardi, A. similior, A. sparsatus, A. subnotatus, A. suffusus, A. validus, A. velox et A. vernalis) et une autre, A. inopinatus, est soupçonnée vivre dans la portion nord de la province. Les mâles adultes de toutes les espèces nord-américaines ont été décrits par Zloty (1996, The Canadian Entomologist128 : 293–346). Dans cet article, nous décrivons les larves des stades avancés et les femelles adultes des 14 espèces trouvées en Alberta; la répartition de chacune des espèces est indiquée et des clés permettront l’identification des adultes, mâles et femelles, et des larves. Tous les caractères diagnostiques sont décrits et illustrés. Les clés d’identification peuvent également servir en Saskatchewan, dans l’est de la Colombie-Britannique, dans le Montana et dans le nord de l’Idaho et du Washington.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 129 , Issue 2 , April 1997 , pp. 251 - 289
Copyright
Copyright © Entomological Society of Canada 1997

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