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Genus Cheiracanthium - Longlegged Sac Spiders

spider - Cheiracanthium inclusum - male is this??? - Cheiracanthium mildei - female spider - Cheiracanthium - male another sac spider - Cheiracanthium mildei 1406 - Cheiracanthium mildei - male Trachelas in nest - Cheiracanthium inclusum Cheiracanthium inclusum ? - Cheiracanthium - female Eutichuridae ? - Cheiracanthium
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Order Araneae (Spiders)
Infraorder Araneomorphae (True Spiders)
No Taxon (Entelegynae)
Family Cheiracanthiidae
Genus Cheiracanthium (Longlegged Sac Spiders)
Synonyms and other taxonomic changes
Cheiracanthium was previously placed in Miturgidae and was transferred to the new family Eutichuridae by Ramírez, 2014.(1)(2)

Chiracanthium is considered by the World Spider Catalog as "an unjustified emendation."

Formerly classified in the Clubionidae
Explanation of Names
From Greek, meaning "hand spinelet", referring to the backwardly directed process on the cymbium of the male palp. (3)
Numbers
2 species in our region.
Identification
"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 characterised by having relatively thinner legs and more robust bodies than Clubiona." From article by Jørgen Lissner seen here.
Range
C. inclusum is indigenous to much of the United States (except the northernmost states), while C. mildei, an introduced species from Europe, was found throughout much of the Northeast as of 1978. It is likely that C. mildei has substantially increased its range since that time. (1)
Remarks
Being Bitten:
Some species are thought to be slightly dangerous. However, this may not be true. See articles:
~ www.ajtmh.org - VERIFIED BITES BY YELLOW SAC SPIDERS (GENUS CHEIRACANTHIUM) IN THE UNITED STATES AND AUSTRALIA: WHERE IS THE NECROSIS?
~ www.jabfm.org - Spider Myths and a Case of a Bite by a Yellow Sac Spider
Internet References
(1) Pennsylvania State University, Department of Entomology - Range, images and information.

World Spider Catalog (2014). World Spider Catalog. Natural History Museum Bern, online at http://wsc.nmbe.ch, version 15.5, accessed on 11/11/2014(2)
Works Cited
1.The morphology and phylogeny of dionychan spiders
Ramírez, Martín J. 2014. Bulletin of the American Museum of Natural History.
2.World Spider Catalog
3.Spiders of North America: An Identification Manual
D. Ubick, P. Paquin, P.E. Cushing and V. Roth (eds). 2005. American Arachnological Society.