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Analysis of the genus Gymnodampia (Acari: Oribatida), with redescription of G. setata and description of two new species from North America

Published online by Cambridge University Press:  02 April 2012

Jun Chen ,
Roy A. Norton ,
Valerie M. Behan-Pelletier  and
Hui-Fu Wang
Jun Chen
Affiliation:
Institute of Zoology, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
Roy A. Norton
Affiliation:
State University of New York, College of Environmental Science and Forestry, Syracuse, New York 13210, United States of America
Valerie M. Behan-Pelletier*
Affiliation:
Systematic Entomology, Agriculture and Agri-Food Canada, KW Neatby Building, Ottawa, Ontario, Canada K1A 0C6
Hui-Fu Wang
Affiliation:
Institute of Zoology, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
*
1Corresponding author (e-mail: behanpv@agr.gc.ca).
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Abstract

Morphology, distribution, and habitat data are presented for three species of the oribatid mite genus Gymnodampia Jacot occurring in North America. A revised generic diagnosis is given and the type species Gymnodampia setata (Berlese) is redescribed based on topotypic material from Missouri. Immatures of G. setata are described and aspects of their biology are presented. Two new species from North America, G. jacotisp. nov. and G. lindquistisp. nov., are proposed and described on the basis of adults, and a key is given for North American species of Gymnodampia. The ameroid genera Cristamerus Hammer, from Pakistan and China, and Defectamerus Aoki, from Japan, Korea, and China, are considered junior synonyms of Gymnodampia, and G. conformis (Fujikawa) is considered a junior synonym of G. fusca (Fujikawa). Immatures of G. setata are apheredermous, but with a circular line of dehiscence, whereas known immatures of the superfamily Ameroidea are eupheredermous. Nonetheless, without convincing apomorphic traits linking Gymnodampia to any known apheredermous family of Brachypylina, we hypothesize that Gymnodampia has lost the eupheredermy characteristic of Ameroidea, and we place it in the family Ameridae on the basis of adult similarities.

Résumé

Des données sur la morphologie, la distribution et l'habitat de trois espèces d'oribate du genre Gymnodampia Jacot, présentes en Amérique du Nord, sont discutées. Une diagnose générique revisée est présentée et le type de l'espèce Gymnodampia setata (Berlese) est redécrit à partir du matériel topotypique du Missouri. Les stases immatures de G. setata sont décrites, et leurs caractéristiques biologiques sont présentées. Deux nouvelles espèces de l'Amérique du Nord: G. jacotisp. nov. et G. lindquistisp. nov., sont proposées et décrites basée sur les adultes, et une clé d'identification est donnée pour les espèces nord-américaine de Gymnodampia. Les genres d'Ameroidea, Cristamerus Hammer du Pakistan et de la Chine, et Defectamerus Aoki du Japon, de la Corée et de la Chine sont considérés comme étant des synonymes plus récents de Gymnodampia, et G. conformis (Fujikawa) est considérée comme étant un synonyme plus récents de G. fusca (Fujikawa). Les stases immatures de G. setata sont aphérédermes mais avec une ligne de déhiscence circulaire, tandis que les immatures d'Ameroidea sont euphérédermes. Toutefois, sans traits caractéristiques apomorphiques déterminants liant Gymnodampia à toute autre famille connue d'aphérédermes Brachypylina, notre hypothèse est que Gymnodampia a perdu le trait d'euphéréderme d'Ameroidea et basée sur leur ressemblance avec les adultes d'ameride, nous le placons dans la famille Ameridae.

Type
Articles
Information
The Canadian Entomologist , Volume 136 , Issue 6 , December 2004 , pp. 793 - 821
Copyright
Copyright © Entomological Society of Canada 2004

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