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Subfamily Erigoninae - Dwarf Spiders

dwarf spider - Coreorgonal monoceros - male Micrargus longitarsus - female Carapace, anterodorsal view - Micrargus longitarsus - female Dark Colored Spider - female Erigone autumnalis - female Walckenaeria spiralis - Walckenaeria - male Glyphesis scopulifer - female Mermessus maculatus - male
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Order Araneae (Spiders)
Infraorder Araneomorphae (True Spiders)
No Taxon (Entelegynes )
Family Linyphiidae (Sheetweb and Dwarf Spiders)
Subfamily Erigoninae (Dwarf Spiders)
Other Common Names
In the United States they are called "dwarf spiders," in England "money spiders," and in German they are known under the common name of "Zwergspinnen."(1)
Numbers
About 650 species and 122 genera of erigonines known in America north of Mexico. (1)
Size
1 to 6 mm (most are about 2 mm)
Internet References
(1) PDF Article, Gustavo Hormiga - Higher Level Phylogenetics of Erigonine Spiders.

(2) The LinEpig project displays digital images of the epigynes (female external sex organs) for identified specimens of Erigoninae in North America.