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ACANTHOMOLA PUBESCENS, A NEW GENUS AND SPECIES OF HEPTAGENIIDAE (EPHEMEROPTERA) FROM WESTERN CANADA

Published online by Cambridge University Press:  31 May 2012

Eric R. Whiting  and
D.M. Lehmkuhl
Eric R. Whiting
Affiliation:
Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 0W0
D.M. Lehmkuhl
Affiliation:
Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 0W0
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Abstract

Acanthomola pubescens, a new genus and species of Heptageniidae (Ephemeroptera), is described from larvae collected in Saskatchewan and Alberta. Acanthomola superficially resembles Bleptus, Epeorus, and Raptoheptagenia, but differs from these genera, and all other heptageniids, in the structure of the mandibles and maxillae. The molar area of the mandible is greatly reduced and bears only a few stout spines. The crown of the maxillary galea-lacinia is rounded and lacks setae near the apex. The apical segment of the maxillary palpus is long, slender, and bare. Generic and specific descriptions of the larva of A. pubescens, gen. nov., sp. no v., are given, along with biological notes. Acanthomola appears to be a very primitive heptageniid, related to Bleptus, Epeorus, and Ironodes. It is probably most closely related to Spinadis.

Résumé

Acanthomola pubescens, un genre nouveau et une espèce nouvelle de Heptageniidae (Ephemeroptera), est décrit à partir de larves recoltées en Saskatchewan et en Alberta. Acanthomola ressemble superficiellement à Bleptus, Epeorus et Raptoheptagenia, mais il diffère de ces genres, et de tous autres heptageniids, par la structure des mandibules et maxillaires. La portion molaire de la mandibule est réduite beaucoup et ne porte que quelques épines fortes. La couronne de la galea-lacinia de la maxillaire est arrondie et sans soies au sommet. Le segment apical de la palpe maxillaire est long, mince et nu. Les descriptions générique et spécifique de la larve d’Acanthomola pubescens, gen. nov., sp. nov., sont données, suivies par des remarques biologiques. Acanthomola semble être un heptageniid très primitif, qui est apparenté à Bleptus, Epeorus et Ironodes. Il est probablement plus étroitement apparenté à Spinadis.

Type
Articles
Information
The Canadian Entomologist , Volume 119 , Issue 5 , May 1987 , pp. 409 - 417
Copyright
Copyright © Entomological Society of Canada 1987

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References

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