Linyphiidae, spiders commonly known as sheet weavers, or money spiders is a family of very small spiders comprising 4706 described species in 620 genera worldwide. This makes Linyphiidae the second largest family of spiders after the Salticidae. The family is poorly understood due to their small body size and wide distribution, new genera and species are still being discovered throughout the world. The newest such genus is Himalafurca from Nepal, formally described in April 2021 by Tanasevitch. Since it is so difficult to identify such tiny spiders, there are regular changes in taxonomy as species are combined or divided.
Amaurobiidae is a family of three-clawed cribellate or ecribellate spiders found in crevices and hollows or under stones where they build retreats, and are often collected in pitfall traps. Unlidded burrows are sometimes quite obvious in crusty, loamy soil. They are difficult to distinguish from related spiders in other families, especially Agelenidae, Desidae and Amphinectidae. Their intra- and interfamilial relationships are contentious. According to the World Spider Catalog, 2019, the family Amaurobiidae includes about 275 species in 49 genera.
Callobius is a genus of tangled nest spiders first described by R. V. Chamberlin in 1947.
Amaurobius is a genus of tangled nest spiders that was first described by Carl Ludwig Koch in 1837.
Walckenaeria is a genus of dwarf spiders that was first described by John Blackwall in 1833. It is a senior synonym of Paragonatium, as well as Wideria, Cornicularia, Prosopotheca, Tigellinus, and Trachynella.
Erigone is a genus of dwarf spiders that was first described by Jean Victoire Audouin in 1826. They are carnivorous, preying on small insects such as psylla and flies. One of the distinctive characters for this genus is the presence of teeth bordering the carapace.
Cicurina, also called the cave meshweaver, is a genus of dwarf sheet spiders that was first described by Anton Menge in 1871. Originally placed with the funnel weavers, it was moved to the Dictynidae in 1967, then to the Hahniidae in 2017. The name is from the Latin root "cucur-", meaning "to tame".
Metaltella simoni is a species of spider, native to South America, and introduced into the United States and Canada.
Zorodictyna is a genus of spiders in the family Udubidae native to Madagascar. It has been described as an intermediate genus between Zoropsidae and Dictynidae, though it is now placed in Udubidae. This genus was originally placed in the family Zoropsidae, but it has been reassigned several times since. In 1967, Lehtinen moved it to Miturgidae. In 1999, it was moved back to Zoropsidae, and in 2015, it was moved to Udubidae.
Zorodictyna inhonesta is a species of spider in the family Udubidae, found in Madagascar. It was first described by Eugène Simon in 1906 as Uduba inhonesta. Pekka T. Lehtinen transferred it to the genus Zorodictyna in 1967, although Pierre L.G. Benoit was still using the name Uduba inhonesta in 1972.
Ceraticelus is a genus of dwarf spiders that was first described by Eugène Louis Simon in 1884.
Auximella is a genus of South American tangled nest spiders first described by Embrik Strand in 1908.
Pimus is a genus of North American tangled nest spiders first described by R. V. Chamberlin in 1947.
Cheniseo is a genus of North American dwarf spiders that was first described by S. C. Bishop & C. R. Crosby in 1935.
Sciastes is a genus of sheet weavers that was first described by S. C. Bishop & C. R. Crosby in 1938.
Souidas is a monotypic genus of North American sheet weavers containing the single species, Souidas tibialis. It was first described by American entomologists C. R. Crosby & S. C. Bishop in 1936, and has only been found in the United States.
Phrurolithus is a genus of araneomorph spiders first described by C. L. Koch in 1839. First placed with the Liocranidae, it was moved to the Corinnidae in 2002, then to the Phrurolithidae in 2014.
