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New species of the genus Camisia (Acari: Oribatida): an arboreal mite with enclosed sensilli

Published online by Cambridge University Press:  31 May 2012

Z. Olszanowski ,
M.R. Clayton  and
L.M. Humble
Z. Olszanowski
Affiliation:
Department of Animal Taxonomy and Ecology, A Mickiewicz University, Szamarzewskiego 91 A, 60-569 Poznań, Poland
M.R. Clayton*
Affiliation:
Natural Resources Canada, Canadian Forest Service, Pacific Forestry Centre, 506 West Burnside Road, Victoria, British Columbia, Canada V8Z 1M5
L.M. Humble
Affiliation:
Natural Resources Canada, Canadian Forest Service, Pacific Forestry Centre, 506 West Burnside Road, Victoria, British Columbia, Canada V8Z 1M5
*
1Corresponding author (e-mail: [email protected]).
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Abstract

A new oribatid mite (Acari), Camisia abdosensillasp.nov., is described from all instars, based on specimens from British Columbia, Canada. This species occurs on branches and foliose lichens in the canopies of western hemlock, Tsuga heterophylla (Raf.) Sarg., 1898 (Pinaceae), and Pacific silver fir, Abies amabilis (Dougl. ex Loud.) Dougl. ex J. Forbes, 1939 (Pinaceae), growing in high elevation coastal forests. The most unusual feature of this species is the distinctive structure of the prodorsal trichobothrium in adults; the significantly reduced sensillus is completely enclosed within the bothridium. A resemblance between the structure of this organ and those of the superfamily Crotonioidea appears to have resulted from parallel evolution rather than being evidence of a sister-group relationship. Another species, Camisia islandica Gjelstrup and Solhøy, 1994, is herein recognized as a junior synonym of Camisia solhoeyi Colloff, 1993. A key of the Nearctic species of the genus Camisia is given.

Résumé

Un nouvel acarien (Acari) oribate, Camisia abdosensillasp.nov., est décrit à tous ses stades, à partir de spécimens recueillis en Colombie-Britannique (Canada). Cette espèce est présente sur les branches et les lichens foliacés du houppier de proches de l'Ouest, Tsuga heterophylla (Raf.) Sarg., 1898 (Pinaceae), et de sapins gracieux, Abies amabilis (Dougl. ex Loud.) Dougl. ex J. Forbes, 1939 (Pinaceae), poussant dans les forêts côtières en haute altitude. La caractéristique la plus inhabituelle de cette espèce est la structure distinctive de la trichobothrie prodorsale chez l'adulte : cette sensille, notablement réduite, est complètement enfermée à l'intérieur de la bothridie. La ressemblance entre la structure de cet organe et la structure du même organe dans la superfamille des Crotonioidea semble être le résultat d'une évolution parallèle plutôt qu'une indication d'un lien de parenté. Une autre espèce, Camisia islandica Gjelstrup et Solhøy, 1994, est considérée ici comme un synonyme de Camisia solhoeyi Colloff, 1993. Une clé d'identification des espèces néarctiques de genre Camisia est présentée.

Type
Articles
Information
The Canadian Entomologist , Volume 134 , Issue 6 , December 2002 , pp. 707 - 721
Copyright
Copyright © Entomological Society of Canada 2002

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