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MORPHOLOGY, ONTOGENY, AND INTRASPECIFIC VARIABILITY OF THE YEW BIG BUD MITE, CECIDOPHYOPSIS PSILASPIS (ACARI: ERIOPHYIDAE)

Published online by Cambridge University Press:  31 May 2012

Valin G. Marshall
Affiliation:
Canadian Forest Service, Natural Resources Canada, 506 West Burnside Road, Victoria, British Columbia, Canada V8Z 1M5
Marilyn R. Clayton
Affiliation:
Canadian Forest Service, Natural Resources Canada, 506 West Burnside Road, Victoria, British Columbia, Canada V8Z 1M5
Deanna N. Newsom
Affiliation:
Department of Biology, COOP Program, University of Victoria, Victoria, British Columbia, Canada V8W 2Y2

Abstract

All ontogenetic stases of the yew big bud mite, Cecidophyopsis psilaspis (Nalepa), from British Columbia were studied by scanning electron and light microscopy and were compared with an English population of this species. The species was redescribed from the two populations, which were found to be quite similar in general appearance and in most of the morphometric data analyzed. Spermatophores in this species are similar to those observed in other Eriophyoidea. Details of a male spermatophoric organ are described and illustrated for the first time in an eriophyoid mite. Moulting in C. psilaspis is shown to be prodehiscent. The data reported here neither support nor reject the alternative hypothesis that the first active stase is larval versus nymphal. However, to account for the ontogenetic evidence, the first active stase is herein considered larval.

Résumé

Toutes les stases ontogénétiques d’une population de la Colombie-Britannique du phytopte des bourgeons de l’if, le Cecidophyopsis psilaspis (Nalepa), ont été examinées par microscopie électronique à balayage et microscopie optique et comparées à celles d’une population de la même espèce provenant d’Angleterre. Une nouvelle description de l’espèce a été proposée au terme de cet examen. Les deux populations se ressemblaient passablement en ce qui a trait à l’aspect général et à la majorité des données morphométriques analysées. Les spermatophores chez cette espèce sont semblables à ceux observés chez les autres Eriophyoidea et sont décrits en détail et illustrés pour la première fois chez un Eriophyoidea. La mue chez le C. psilaspis est de type prodéhiscent. Les données présentées ici ne confirment ni n’infirment l’hypothèse alternative selon laquelle la première stase active est la larve plutôt que la nymphe. Toutefois, eu égard aux données ontogénétiques recueillies, la larve est considérée ici comme étant la première stase active.

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1998

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