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".
Description
Xysticus and Coriarachne are dark brown or reddish-brown crab spiders often encountered on weeds or trees. While similar to the 'flower spiders', they tend to have shorter, sturdier legs. Many, but not all, species have abdomens more patterned than most Thomisus species, rather like some of the Synema species. Some however, that are more terrestrial, resemble earth in colour and texture.
Most species of the genus Xysticus are small to medium sized spiders. They show a sexual dimorphism in size. Females of typical species reach a maximum of 10 millimetres (0.39 in) of body length, while their males are about 3–5 millimetres (0.12–0.20 in) long, about half the size of the females.
The basic colour of these species is usually brown, beige or gray. The
prosoma is sometimes slightly smaller than the
opisthosoma. In many species the front body shows in the middle a broad, pale longitudinal band. The
opisthosoma is clearly flattened in most species and shows a median broad and dark leaf marking.
The species are often very similar to each other, and in most cases can be distinguished only by a microscopic examination of the reproductive organs.
Behaviour
The spiders of the genus Xysticus do not build webs; like most Thomisidae they are ambush hunters and prefer to hunt near the ground (hence the common name "ground crab spiders"). They move slowly, and commonly hunt by stationing themselves in a high-traffic area and grabbing whatever
arthropod passes close enough. Also like most other Thomisidae, they seize prey with their enlarged anterior two pairs of legs and kill it by a venomous bite.
Species
As of December 2022[update] it contains 293 species, found worldwide:[1]
J. H. Redner and C. D. Dondale - A New Species of The Spider Genus Xysticus (Araneae: Thomisidae) From Arizona - PsycheVolume 72 (1965), Issue 4, Pages 291–294
H. Demir, O. Seyyar, and M. Aktaş - A Poorly Known Species of the Spider Genus Xysticus C. L. Koch (Araneae, Thomisidae) in Turkey - Arch. Biol. Sci., Belgrade, 60 (4), 17P-18P, 2008
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".
Description
Xysticus and Coriarachne are dark brown or reddish-brown crab spiders often encountered on weeds or trees. While similar to the 'flower spiders', they tend to have shorter, sturdier legs. Many, but not all, species have abdomens more patterned than most Thomisus species, rather like some of the Synema species. Some however, that are more terrestrial, resemble earth in colour and texture.
Most species of the genus Xysticus are small to medium sized spiders. They show a sexual dimorphism in size. Females of typical species reach a maximum of 10 millimetres (0.39 in) of body length, while their males are about 3–5 millimetres (0.12–0.20 in) long, about half the size of the females.
The basic colour of these species is usually brown, beige or gray. The
prosoma is sometimes slightly smaller than the
opisthosoma. In many species the front body shows in the middle a broad, pale longitudinal band. The
opisthosoma is clearly flattened in most species and shows a median broad and dark leaf marking.
The species are often very similar to each other, and in most cases can be distinguished only by a microscopic examination of the reproductive organs.
Behaviour
The spiders of the genus Xysticus do not build webs; like most Thomisidae they are ambush hunters and prefer to hunt near the ground (hence the common name "ground crab spiders"). They move slowly, and commonly hunt by stationing themselves in a high-traffic area and grabbing whatever
arthropod passes close enough. Also like most other Thomisidae, they seize prey with their enlarged anterior two pairs of legs and kill it by a venomous bite.
Species
As of December 2022[update] it contains 293 species, found worldwide:[1]
J. H. Redner and C. D. Dondale - A New Species of The Spider Genus Xysticus (Araneae: Thomisidae) From Arizona - PsycheVolume 72 (1965), Issue 4, Pages 291–294
H. Demir, O. Seyyar, and M. Aktaş - A Poorly Known Species of the Spider Genus Xysticus C. L. Koch (Araneae, Thomisidae) in Turkey - Arch. Biol. Sci., Belgrade, 60 (4), 17P-18P, 2008