The Thomisidae are a family of spiders, including about 170 genera and over 2,100 species. The common name crab spider is often linked to species in this family, but is also applied loosely to many other families of spiders. Many members of this family are also known as flower spiders or flower crab spiders.
Xysticus is a genus of ground crab spiders described by C. L. Koch in 1835, belonging to the order Araneae, family Thomisidae. The genus name is derived from the Ancient Greek root xyst, meaning "scraped, scraper".
Cheiracanthium, commonly called yellow sac spiders, is a genus of araneomorph spiders in the family Cheiracanthiidae, and was first described by Carl Ludwig Koch in 1839. They are usually pale in colour, and have an abdomen that can range from yellow to beige. Both sexes range in size from 5 to 10 millimetres. They are unique among common house spiders because their tarsi do not point either outward, like members of Tegenaria, or inward, like members of Araneus), making them easier to identify.
Diaea is a genus of crab spiders first described by Tamerlan Thorell in 1869. Most species are found in specific locations except for D. livens, which occurs in the United States and D. dorsata, which has a palearctic distribution. Adults are 5 millimetres (0.20 in) to 7 millimetres (0.28 in) and tend to hide in and around vegetation, especially flowers, where their color allows them to blend in to their surroundings.
Neoscona, known as spotted orb-weavers and barn spiders, is a genus of orb-weaver spiders (Araneidae) first described by Eugène Simon in 1895 to separate these from other araneids in the now obsolete genus Epeira. The name Neoscona was derived from the Greek νέω, meaning "spin", and σχοῖνος, meaning "reed" They have a mostly pantropical distribution and one species, Neoscona adianta, has a palearctic distribution. As of April 2019 there are eight species that can be found in the United States and Canada:
Pistius is a genus of crab spiders with nine described species. Most occur in Asia, only P. truncatus has a palaearctic distribution.
Runcinia is a genus of crab spiders that was first described by Eugène Louis Simon in 1875. The former R. elongata is a synonym of Thomisus elongatus.
Tibellus is a genus of slender crab spiders described by Simon in 1875, belonging to the order Araneae, family Philodromidae. Species of this genus are present in Eurasia, Africa, Americas and Australia.
The genus Oxytate, commonly known as grass crab spiders, comprises a homogenous group of nocturnal crab spiders. The complete mitochondrial genome of the type species O. striatipes was determined in 2014.
Borboropactus is a genus of crab spiders that was first described by Eugène Louis Simon in 1884.
Epidius is a genus of crab spiders that was first described by Tamerlan Thorell in 1877. It is a senior synonym of Pothaeus.
Monaeses is a genus of crab spiders in the family Thomisidae, containing twenty seven species.
Angaeus is a genus of Asian crab spiders first described by Tamerlan Thorell in 1881. It is considered a senior synonym of Paraborboropactus.
Camaricus is a genus of crab spiders that was first described by Tamerlan Thorell in 1887.
Corynethrix is a monotypic genus of South Pacific crab spiders containing the single species, Corynethrix obscura. It was first described by Ludwig Carl Christian Koch in 1876 based on a female specimen. They have been found in New South Wales and Queensland. A male has not yet been identified, and there is very little known about the biology and behaviour of this species and its relatives.
Hedana is a genus of crab spiders that was first described by Ludwig Carl Christian Koch in 1874.
Tharpyna is a genus of spiders in the family Thomisidae. It was first described in 1874 by L. Koch. As of 2017, it contains 12 species from Australia, India, and Indonesia.
Australomisidia is a genus of spiders in the family Thomisidae. It was first described in 2014 by Szymkowiak. As of 2017, it contains 8 species, all from Australia.
Boomerangiana is a monotypic genus of Australian crab spiders in the tribe Misumenini containing the single species, Boomerangiana dimidiata. They are small white spiders, only 2 to 3 millimetres long, with silvery round abdomen. The species was originally described in 1867 by Ludwig Koch from an immature female found in Brisbane. Though he originally placed it with Xysticus, after several more were found in Rockhampton and Gayndah and more information became available, he moved the species to Diaea. It was moved to its own genus in 2014 named Boomerangia, but was renamed Boomerangiana when it was discovered that the name was already in use for a family of nematodes.
Asianopis is a genus of Asian net-casting spiders first described by Y. J. Lin, L. Shao and A. Hänggi in 2020.
