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On the misidentification of chalcid (Hymenoptera: Chalcidoidea) parasitoids of the cabbage seedpod weevil (Coleoptera: Curculionidae) in North America

Published online by Cambridge University Press:  02 April 2012

Gary A.P. Gibson*
Affiliation:
Agriculture and Agri-Food Canada, Biodiversity and Integrated Pest Management, K.W. Neatby Building, 960 Carling Avenue, Ottawa, Ontario, Canada K1A 0C6
Hannes Baur
Affiliation:
Department of Invertebrates, Naturhistorisches Museum, Bernstrasse 15, CH-3005 Bern, Switzerland
Bryan Ulmer
Affiliation:
Department of Agricultural, Food and Nutritional Science, 4–10 Agriculture/Forestry Centre, University of Alberta, Edmonton, Alberta, Canada T6G 2P5
Lloyd Dosdall
Affiliation:
Department of Agricultural, Food and Nutritional Science, 4–10 Agriculture/Forestry Centre, University of Alberta, Edmonton, Alberta, Canada T6G 2P5
Franck Muller
Affiliation:
CABI Bioscience Centre, Rue des Grillons, Delémont, Switzerland
*
1Corresponding author (e-mail: [email protected]).

Abstract

Previous identifications in North America of Trichomalus perfectus (Walker, 1835) and Mesopolobus morys (Walker, 1848) (Chalcidoidea: Pteromalidae), the principal chalcid parasitoids of the cabbage seedpod weevil (Ceutorhynchus obstrictus Marsham, 1802) in Europe, are shown to be misidentifications of Trichomalus lucidus (Walker, 1835) and Mesopolobus (Xenocrepis) moryoidessp. nov., respectively. Necremnus duplicatus Gahan, 1941 (Chalcidoidea: Eulophidae) is synonymized formally under Necremnus tidius (Walker, 1839) syn. nov., confirming a previous, tentative synonymy. Both sexes of N. tidius, M. moryoides, and T. lucidus are illustrated and compared with those of similar species using macrophotography and scanning electron microphotography. Hypotheses are offered to explain why the principal chalcid parasitoids of the cabbage seedpod weevil differ between North America and Europe and how the three treated species came to be in North America.

Résumé

Les insectes connus jusqu'ici en Amérique du Nord comme Trichomalus perfectus (Walker, 1835) et Mesopolobus morys (Walker, 1848) (Chalidoidea: Pteromalidae), les principaux chalcidiens parasitoïdes du charaçon de la graine de chou (Ceutorhynchus obstrictus Marsham, 1802) en Europe, sont mal identifiés; il s'agit, en fait, respectivement de Trichomalus lucidus (Walker, 1835) et de Mesopolobus (Xenocrepis) moryoidessp. nov.Necremnus duplicatus Gahan, 1941 (Chalcidoidea: Eulophidae) devient formellement un synonyme plus récent de Necremnus tidius (Walker, 1839) syn. nov., confirmant ainsi une synonymie préliminaire antérieure. Des macrophotographies et des microphotographies au microscope électronique à balayage viennent illustrer les deux sexes de N. tidius, de M. moryoides et de T. lucidus et permettent des comparaisons avec les espèces similaires. Des hypothèses cherchent à expliquer pourquoi les chalcidiens parasitoïdes du charançon de la graine de chou sont différents en Amérique du Nord et en Europe et comment les trois espèces en question se sont retrouvées en Amérique du Nord.

[Traduit par la Rédaction]

Type
Articles
Copyright
Copyright © Entomological Society of Canada 2005

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