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Family Clubionidae - Sac Spiders

spider - Elaver excepta Clubiona - Clubiona lutescens - female Clubionidae - Sac Spiders - female small brown spider - Elaver spider - Elaver Spider found in Burnaby, British Columbia, Canada. - Clubiona Brown spider - Clubiona Elaver
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Order Araneae (Spiders)
Infraorder Araneomorphae (True Spiders)
No Taxon (Entelegynae)
Family Clubionidae (Sac Spiders)
Synonyms and other taxonomic changes
Reclassifed Trachelas genus from Clubionidae to Corinnidae family. (source: 2005 AMNH World Spider Catalog)

Elaver is a synonym for Clubionoides.
2 Genera in Bugguide's range - USA & Canada.
Clubiona - USA & Canada - Widespread
Elaver - USA & Canada - Eastern USA & extreme Southeatern Canada west to Montana and Arizona. (1)
See Also
"Cheiracanthium are distinguished from the closely related species of Clubiona by lacking a conspicuous dorsal groove in the midline of the carapace, the lack of a cluster of long curved erect setae at the anterior end of the abdomen, by having the first pair of legs the longest, and by having a long, pointed spur extending back from the cymbium over the tibia. Species of Cheiracanthium are also chracterised by having relatively thinner legs and more robust bodies than Clubiona." From article by Jørgen Lissner seen here.
Print References
RJ Edwards 1958 revision of this family (a subfamily at that time) in the Bulletin of the Museum of Comparative Zoology at Harvard College is on page 365-436 here at the Biodiversity Heritage Library. Keep in mind that some of the genera in this revision have since been transferred to other families.
Works Cited
1.Spiders of North America: An Identification Manual
D. Ubick, P. Paquin, P.E. Cushing and V. Roth (eds). 2005. American Arachnological Society.