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Species Chthonius tetrachelatus

 
 
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Order Pseudoscorpiones. In: Zhang Z.-Q. (ed.) Animal biodiversity: An outline of higher-level classification...
By Harvey M.S.
Zootaxa 3703: 34–35, 2013

Photographic key to the Pseudoscorpions of Canada and the adjacent USA
By C.M. Buddle
Canadian Journal of Arthropod Identification No. 10, 2010
Online version
Full text
A brand-new helpful source with a key to 35 taxa (33 genera + some species) representing 9 families. The introduction provides general info on the order and the fauna of the region.

Please keep in mind that the key uses no features that are visible on a general dorsal view, so sorting pseudoscorpions from live photographs even to families is virtually impossible. All the diagnostic characters are microscopic.

World Arachnida Catalogue
Western Australian Museum, Leibniz Institute for the Analysis of Biodiversity Change, & Natural History Museum Bern
Online here

Spiders of North America
By Sarah Rose
Princeton University Press, 2022
Substantial guide with 624 pages with 2,830 color illustrations and 508 maps. Foreword by Bug Eric (Eric Eaton).
Update 13 May 2023. Having used this book for a while now, am very impressed. Photos are excellent, and plentiful.

Amazing Arachnids
By Jillian Cowles
Princeton University Press, 2018
“This engaging book is beautifully written and illustrated, and should appeal to anyone interested in natural history. I enjoyed reading Amazing Arachnids.” —Paula Cushing, Denver Museum of Nature and Science

“Cowles has assembled a fascinating collection of phenomena pertaining to arachnids and presented it with a narrative that is simply a joy to read.” —W. David Sissom, West Texas A&M University

Death comes on two wings: a review of dipteran natural enemies of arachnids
By Gillung J.P., Borkent C.J.
J. Arachnol. 45: 1–19, 2017

Catalogue of the Smaller Arachnid Orders of the World: Amblypygi, Uropygi, Schizomida, Palpigradi, Ricinulei and Solifugae
By Mark S. Harvey
CSIRO Publishing, Australia, 2003

A collection of spiders and harvestmen from two caves in Ontario and Newfoundland, Canada (Araneae, Opiliones)
By Wilfried Breuss
Contributions to Natural History (Bern) 12: 297-313, 2009
At the time of adding this reference, the full text was available online HERE.

 
 
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