The sac spiders of the family Clubionidae have a very confusing taxonomic history. Once, this family was a large catch-all taxon for a disparate collection of spiders, similar only in that they had eight eyes arranged in two rows and conical anterior spinnerets that touched, and were wandering predators that built silken retreats, or sacs, usually on plant terminals, between leaves, under bark, or under rocks. These are now recognized to include several families, some of which are more closely related to the three-clawed spiders, like lynx and wolf spiders, than to Clubionidae and related families.
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.
Ant spiders are members of the family Zodariidae. They are small to medium-sized eight-eyed spiders found in all tropical and subtropical regions of South America, Africa, Madagascar, Australia-New Guinea, New Zealand, Arabia and the Indian subcontinent. Most species are daytime hunters and live together with ants, mimicking their behavior and sometimes even their chemical traits. Although little is known about most zodariids, members of the genus Zodarion apparently feed only on ants; a number of other genera in the family are apparently also ant specialists.
Tenedos is a spider genus of the family Zodariidae. It has around 45 species from Central and South America.
Tomis is a genus of South American jumping spiders that was first described by F.O. Pickard-Cambridge in 1901. The genus Pseudattulus, erected by Lodovico di Caporiacco in 1947, was formerly considered distinct with two species, but was placed in synonymy in 2020 when Tomis was re-separated from Sitticus.
Ochyroceratidae is a six-eyed spider family, with 165 described species in ten genera. They are common inhabitants of caves and the tropical forest litter of South Africa, the Caribbean, Asia and South America. Considered an ecological counterpart of the Linyphiidae of the northern temperate zone, species are especially diverse in the Indo-Pacific region.
Agyneta is a genus of dwarf spiders that was first described by J. E. Hull in 1911.
Arabellata is a genus of South Pacific sac spiders first described by V. Versteirt, L. Baert & Rudy Jocqué in 2010. As of April 2019 it contains only two species, both found in Papua New Guinea.
Invexillata is a genus of South Pacific sac spiders first described by V. Versteirt, L. Baert & Rudy Jocqué in 2010. As of April 2019 it contains only three species, all found in Papua New Guinea.
Pteroneta is a genus of sac spiders first described by Christa L. Deeleman-Reinhold in 2001.
Jocquella is a genus of Papuan long-legged cave spiders that was first described by L. Baert in 1980. As of September 2019 it contains two species, found in Papua New Guinea: J. boisai and J. leopoldi.
Alioranus is a genus of dwarf spiders that was first described by Eugène Louis Simon in 1926.
Allotiso is a monotypic genus of dwarf spiders containing the single species, Allotiso lancearius. It was first described by A. V. Tanasevitch in 1990, and has only been found in Georgia and in Turkey.
Caucasopisthes is a monotypic genus of Asian dwarf spiders containing the single species, Caucasopisthes procurvus. It was first described by A. V. Tanasevitch in 1990, and has only been found in Georgia and Russia.
Dactylopisthoides is a monotypic genus of Asian dwarf spiders containing the single species, Dactylopisthoides hyperboreus. It was first described by K. Y. Eskov in 1990, and has only been found in Russia.
Erigonops is a monotypic genus of African dwarf spiders containing the single species, Erigonops littoralis. It was first described by N. Scharff in 1990, and has only been found in South Africa.
Paraeboria is a monotypic genus of Asian dwarf spiders containing the single species, Paraeboria jeniseica. It was first described by K. Y. Eskov in 1990, and has only been found in Russia.
Sphecozone is a genus of sheet weavers that was first described by Octavius Pickard-Cambridge in 1871.
Yoroa is a genus of South Pacific comb-footed spiders that was first described by L. Baert in 1984. As of June 2020 it contains two species, found in Australia and Papua New Guinea: Y. clypeoglandularis and Y. taylori.
Xenoctenidae is a family of araneomorph spiders separated from Miturgidae in 2017.
