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Issue: Vol. 3432 No. 1: 21 Aug. 2012
Type: Articles
Published: 2012-08-21
DOI: 10.11646/zootaxa.3432.1.1
Page range: 1–62
Abstract views: 28
PDF downloaded: 2

Oribatella (Acari, Oribatida, Oribatellidae) of western North America

Invertebrate Biodiversity Program, Research Branch, Agriculture and Agri-Food Canada, K. W. Neatby Bldg., Ottawa, Ontario, Canada K1A 0C6
Invertebrate Zoology, Royal Alberta Museum, 12845 - 102 Avenue, Edmonton, Alberta, Canada T5N 0M6
Acari Oribatida Oribatellidae Oribatella new species immatures immature hysterosomal sclerotization sexual dimorphism western North America Canada USA

Abstract

The oribatid mite genus Oribatella (Oribatellidae) includes 18 species known previously from North America. Herein, wedescribe 11 new Oribatella species from montane, subarctic, forest and prairie habitats in western North America: O. abmisp. nov., O. banksi sp. nov., O. ewingi sp. nov., O. heatherae sp. nov., O. manningensis sp. nov., O. maryae sp. nov., O.oregonensis sp. nov., O. parallelus sp. nov., O. pawnee sp. nov., O. sintranslamella and O. yukonensis sp. nov.Descriptions of two species (O. heatherae and O. pawnee) include some developmental instars. That of O. yukonensisincludes all instars; nymphs retain dorsocentral setae dm and dp, but the setal morphology changes between larva andnymphs. These immatures bear sclerotized areas on the hysterosoma. Adults of Oribatella oregonensis show distinctsexual dimorphism, with three notogastral setae arising from fused porose areas in the male. We provide new distributionrecords for Oribatella species previously known from North America, including O. arctica Thor, 1930, O. canadensisBehan-Pelletier and Eamer, 2010, O. jacoti Behan-Pelletier, 2011 and O. reticulatoides Hammer, 1955, and remark on O.anomola Grabowski, 1970. We clarify description of the octotaxic system and the interlamellar region in species ofOribatella and discuss variability in hysterosomal sclerotization and setation in immatures. Finally, we give a key to adults of the 29 species of Oribatella now known from North America.

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