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Family Dipluridae

Spider - Euagrus chisoseus Spider - Euagrus chisoseus Mygalomorph - Euagrus chisoseus Mygalomorph - Euagrus chisoseus from SWRS - Euagrus chisoseus - female Microhexura idahoana - female Microhexura idahoana - female Euagrus chisoseus - male
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Order Araneae (Spiders)
Infraorder Mygalomorphae (Mygalomorphs)
Family Dipluridae
Numbers
2 genera in North America north of Mexico
Size
3.5-17mm in body length (Microhexura spp. are pretty small, Euagrus spp. are larger)(1)
Identification
Long spinnerets, but distal segments not pseudosegmented (compare to Mecicobothiriidae).

Range
Euagrus
Euagrus chisoseus: southeastern Arizona and adjacent northeastern Sonora east to southcentral Texas.(2)
Euagrus comstocki: along the lower Rio Grande River in extreme southern Texas.(2)
Euagrus rothi: known only from the Baboquivari Mountains in extreme southern Arizona.(2)

Microhexura
Microhexura idahoana: Cascade Mountains, Blue Mountains, and northern Rocky Mountains of Washington, Oregon, Idaho, and Montana.(3)
Microhexura montivaga: higher mountain peaks of the southern Blue Ridge Province in western North Carolina and eastern Tennessee.(3)
Habitat
Ground-based webs under objects or in soft organic substrates.
Remarks
Microhexura montivaga, the "Spruce-fir moss spider," is an endangered/protected species and is also one of the world's smallest mygalomorphs!
Print References
Coyle, Frederick A., 1981. The mygalomorph spider genus Microhexura (Araneae, Dipluridae). Bulletin American Museum of Natural History 170: 64-75. (download available here)

Coyle, Frederick A., 1988. A revision of the American funnel-web mygalomorph spider genus Euagrus (Araneae, Dipluridae). Bulletin American Museum of Natural History 187: 203-292. (download available here)

Ubick et al., 2005. Spiders of North America: an Identification Manual. American Arachnological Society, Keene (New Hampshire). 377 pages.
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.
2.A revision of the American funnel-web mygalomorph spider genus Euagrus (Araneae, Dipluridae)
Frederick A. Coyle. 1988. Bulletin of the American Museum of Natural History 187(3): 203-292.
3.The mygalomorph spider genus Microhexura (Araneae, Dipluridae)
Frederick A. Coyle. 1981. Bulletin American Museum of Natural History 170: 64-75.