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REVISION OF THE NEARCTIC SPECIES OF CYZENIS ROBINEAU-DESVOIDY (DIPTERA: TACHINIDAE)

Published online by Cambridge University Press:  31 May 2012

James E. O’Hara
Affiliation:
Biological Resources Division, Centre for Land and Biological Resources Research, Agriculture Canada, Research Branch, Central Experimental Fann, Ottawa, Ontario, Canada K1A 0C6
Bruce E. Cooper
Affiliation:
Biological Resources Division, Centre for Land and Biological Resources Research, Agriculture Canada, Research Branch, Central Experimental Fann, Ottawa, Ontario, Canada K1A 0C6

Abstract

Cyzenis Robineau-Desvoidy is a member of the Goniini, a tribe characterized by the production of microtype eggs in adult females. A new concept of Cyzenis is proposed based on a synapotypic character state of adults, i.e. the presence of narrowly separated discal scutellar setae. Two monophyletic species groups are recognized, containing a total of five species in the Nearctic Region: the albicans-gcoup with C. albicans (Fallén) (a species introduced to North America from Europe), C. pullula (Townsend), and C. browni (Curran); and the incrassata-graup with C. incrassata (Smith) and C. ustulaia (Reinhard). A Palearctic species, C. jucunda (Meigen), is recognized as a member of the albicans-group. Phorocera anassa Reinhard is newly synonymized with C. incrassata. Phorocera festbums Aldrich and Webber, Phorocera mitis Curran. and Phorocera regilla Reinhard are transferred from Cyzenis to Eufrontina Brooks (new combinations). A lectotype is designated for C. albicans (Fallén). Nearctic species of Cyzenis are keyed and redescribed, their distributions are mapped, and external, terminate, and puparial features are illustrated. Distinction of individuals of C. albicans and C. pullula is discussed in relation to ecological studies on die host–parasite pair of C. albicans and the winter moth, Operophtera brumata (Linnaeus) (Lepidoptera: Geometridae).

Résumé

Cyzenis Robineau-Desvoidy appartient à la tribu des Goniini, groupe caractérisé par la production d’oeufs de petite taille (microtype) chez les femelles adultes. Une nouvelle définition de Cyzenis est proposée ici, basée sur un caractère synapotype des adultes, la présence de soies scutellaires discales rapprochées. Deux groupes mono-phylétiques sont reconnus, contenant à eux deux cinq espèces de la région néarctique : le groupe albicans, qui renferme C. albicans (Fallén) (une espèce introduite d’Europe en Amérique du Nord), C. pullula (Townsend) et C. browni (Cunan), et le groupe incrassata, qui renferme C. incrassata (Smith) et C. ustulata (Reinhard). Un espèce paléarctique, C. jucunda (Meigen), appartient aussi au groupe albicans. Phorocera anassa Reinhard est déclaré synonyme de C. incrassata. Phorocera festinans Aldrich et Webber, Phorocera mitis Curran et Phorocera regilla Reinhard sont transférés du genre Cyzenis au genre Eufrontina Brooks (nouvelles combinaisons). Un lectotype a été désigné pour représenter C. albicans (Fallén). On trouvera ici une clé d’identification ainsi que de nouvelles descriptions et des cartes de répartition des espèces de Cyzenis; leurs caractères externes et génitaux ainsi que leur puparium sont illustrés. La distinction entre C. albicans et C. pullula est examinée à la lumière des études écologiques sur la relation hôte–parasite entre C. albicans et l’Arpenteuse tardive, Operophtera brumata (Linnaeus) (Lepidoptera : Geometridae).

[Traduit par la rédaction]

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1992

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