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The spiders of Thomisidae are not known to be harmful to humans. However, spiders of a distantly related genus, Sicarius, which are sometimes referred to as "crab spiders", or "six-eyed crab spiders", are close cousins to the recluse spiders, and are highly venomous, though human bites are rare.
Xysticus funestus, the mournful ground crab spider, the sad ground crab spider or the deadly ground crab spider is a species of ground crab spider in the family Thomisidae. [1] [2] It is found in North America. [2] [3] [4] Despite one of the suggested common names - ‘deadly ground crab spider’, Xysticus funestus poses no threat to humans ...
A ground crab spider with earthy coloration. 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.
A venomous spider bite (like this brown recluse bite) can cause a red or purplish rash radiating from the site of the bite. There are only a few species of spiders in the U.S. that can bite humans.
Black widows make irregular or asymmetric webs, Medline Plus says, and the spiders can bite people when humans bump into their webs. The spiders also typically stay within a few feet of ground level.
Like other crab spiders, they are masters of ambush and disguise. [2] They stalk their prey at night, from an ambush position on a grass stem or from the underside of a leaf and are difficult to spot due to their camouflage. They can sense the vibrations caused by invertebrates moving on the leaf's upper side, and quickly pounce on the victim. [7]
However, most bite victims suffer only local pain and bleeding, a few more have limited neurotoxic symptoms (tingling, racing heart, more widespread pain), and there have been several recorded bites by this spider producing severe symptoms requiring medical treatment. [37] There are no recorded human fatalities due to mouse spider bites.
Hexophthalma hahni (synonyms Sicarius hahni and Sicarius testaceus), known along with other members of the genus as the six-eyed sand spider, is a member of the family Sicariidae, found in deserts and other sandy places in southern Africa. Due to their flattened stance and laterigrade legs, they are also sometimes known as six-eyed crab spiders.