Oonopidae, also known as goblin spiders, is a family of spiders consisting of over 1,600 described species in about 113 genera worldwide, with total species diversity estimated at 2000 to 2500 species. The type genus of the family is OonopsKeyserling, 1835.
Linyphiidae 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 known; 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. Because of the difficulty in identifying such tiny spiders, there are regular changes in taxonomy as species are combined or divided.
Scaffold web spiders (Nesticidae) is a family of araneomorph spiders closely allied with tangle web spiders. Like the "Theridiidae", these spiders have a comb of serrated bristles on the hind tarsi that are used to pull silk bands from the spinnerets. It contains 16 genera and about 300 species, many of which are associated with caves or overhangs. The genus Nesticus is the type for the family and is found throughout the world. The related Eidmannella has speciated considerably in Texas caves and includes some extremely localized species that are considered threatened. One species, Eidmannella pallida, is found in caves and under overhangs, but also in agricultural fields and other habitats away from such restricted areas. The genus Carpathonesticus is found in central Eurasia.
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.
Molestia is a monotypic genus of East Asian dwarf spiders containing the single species, Molestia molesta. It was first described by L. H. Tu, Michael I. Saaristo & S. Q. Li in 2006, and has only been found in China.
Andasta is a genus of ray spiders that was first described by Eugène Louis Simon in 1895.
Andasta siltte is a species of ray spider that is endemic to the Seychelles. It is only known from a single specimen from Silhouette Island. It is found in woodlands at the lower edge of cloud forest. It is threatened by habitat deterioration, from invasive plants and climate change.
Argyrodella is a monotypic genus of Seychelloise comb-footed spiders containing the single species, Argyrodella pusillus. It was first described by Michael I. Saaristo in 2006, and is found on the Seychelles.
Agyneta is a genus of dwarf spiders that was first described by J. E. Hull in 1911.
Agyneta amersaxatilis is a species of sheet weaver spider found in Russia, Canada, Alaska, and the continental United States. It was described by Saaristo & Koponen in 1998.
Zoma zoma is a species of ray spider that is endemic to Silhouette Island of Seychelles. It is threatened by habitat degradation from invasive plants, such as Cinnamomum verum.
Pleorotus was a monotypic genus of Seychelloise huntsman spiders containing the single species, Pleorotus braueri. It was first described by Eugène Louis Simon in 1898, and was endemic to the Seychelles. The description was based on a single male collected on Mahe Island in 1894, but none have been found in later collections, and it has been declared extinct.
Ouette is a genus of spiders in the family Ochyroceratidae. It was first described in 1998 by Michael Saaristo. As of 2021, it contains 2 species:
Bifurcia is a genus of Asian dwarf spiders that was first described by Michael I. Saaristo, L. H. Tu & S. Q. Li in 2006.
Theoa is a genus of sheet weavers that was first described by Michael I. Saaristo in 1995.
Nanume is a monotypic genus of comb-footed spiders containing the single species, Nanume naneum. It was first described by Michael I. Saaristo in 2006, and is found on the Aldabra Atoll.
Seycellesa is a genus of spiders in the family Theridiidae. It consists of only its type species: Seycellesa braueri, which is endangered and endemic to the Seychelles.
Michael I. Saaristo was a Finnish arachnologist, with a particular interest in the spiders of the Seychelles. The World Spider Catalog lists 61 genus names or synonyms and 109 species names or synonyms of which he is the sole or co-author.
Euso muehlenbergi is a species of spiders in the family Ochyroceratidae. It was first described in 1998 by Michael Saaristo. As of 2021, it is the only species in the genus Euso, erected by Michael Saaristo in 2001. It is found in the Seychelles.
