Linyphiidae is a family of very small spiders comprising 4667 described species in 618 genera worldwide. This makes Linyphiidae the second largest family of spiders after the Salticidae. The family is poorly known; new genera and species are still being discovered throughout the world. The newest such genus is Yuelushannus from China, formally described in May 2020. Because of the difficulty in identifying such tiny spiders, there are regular changes in taxonomy as species are combined or divided.
Pimoidae is a small family of araneomorph spiders first described by J. Wunderlich in 1986. It contains 37 species in four genera and is monophyletic. It is closely related to the Linyphiidae, and is sometimes used as a synonym for that family.
Microlinyphia is a genus of dwarf spiders that was first described by U. Gerhardt in 1928.
Scotinotylus is a genus of sheet weavers that was first described by Eugène Louis Simon in 1884.
Spirembolus is a genus of North American sheet weavers that was first described by Ralph Vary Chamberlin in 1920.
Anacornia is a genus of North American dwarf spiders that was first described by Ralph Vary Chamberlin & Vaine Wilton Ivie in 1933. As of May 2019 it contains only two species, both found in the United States: A. microps and A. proceps.
Anibontes is a genus of North American dwarf spiders that was first described by Ralph Vary Chamberlin in 1924. As of May 2019 it contains only two species, both found in the United States: A. longipes and A. mimus.
Coloncus is a genus of North American dwarf spiders that was first described by Ralph Vary Chamberlin in 1949.
Eulaira is a genus of North American dwarf spiders that was first described by Ralph Vary Chamberlin & Vaine Wilton Ivie in 1933.
Graphomoa is a monotypic genus of North American dwarf spiders containing the single species, Graphomoa theridioides. It was first described by Ralph Vary Chamberlin in 1924, and has only been found in Alabama, Florida, Georgia, Louisiana, and Tennessee.
Linyphantes is a genus of North American dwarf spiders that was first described by Ralph Vary Chamberlin & Vaine Wilton Ivie in 1942.
Masoncus is a genus of North American dwarf spiders that was first described by Ralph Vary Chamberlin in 1949.
Masonetta is a monotypic genus of North American dwarf spiders containing the single species, Masonetta floridana. It was first described by Ralph Vary Chamberlin & Vaine Wilton Ivie in 1939, and has only been found in the United States.
Oaphantes is a monotypic genus of North American dwarf spiders containing the single species, Oaphantes pallidulus. It was first described by Ralph Vary Chamberlin & Vaine Wilton Ivie in 1943, and has only been found in the United States.
Sisicottus is a genus of sheet weavers that was first described by S. C. Bishop & C. R. Crosby in 1938. They can be found in moss and litter of conifer forests.
Tachygyna is a genus of North American sheet weavers that was first described by Ralph Vary Chamberlin & Vaine Wilton Ivie in 1939.
Tibioplus is a genus of sheet weavers that was first described by Ralph Vary Chamberlin & Vaine Wilton Ivie in 1947. As of June 2019 it contains only two species, both found in Scandinavia, Alaska, Siberia, East Asia, and Kyrgyzstan: T. diversus and T. tachygynoides.
Tunagyna is a monotypic genus of sheet weavers containing the single species, Tunagyna debilis. It was first described by Ralph Vary Chamberlin & Vaine Wilton Ivie in 1933, and is found in the United States, Canada, and Russia.
Wubana is a genus of American sheet weavers that was first described by Ralph Vary Chamberlin in 1919.
Zygottus is a genus of American sheet weavers that was first described by Ralph Vary Chamberlin in 1949. As of June 2019 it contains only two species, found only in the United States: Z. corvallis and Z. oregonus.
