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The Agelenidae are a large family of spiders in the suborder Araneomorphae.Well-known examples include the common "grass spiders" of the genus Agelenopsis.Nearly all Agelenidae are harmless to humans, but the bite of the hobo spider (Eratigena agrestis) may be medically significant, and some evidence suggests it might cause necrotic lesions, [1] but the matter remains subject to debate. [2]
Agelenopsis aperta, also known as the desert grass spider [1] or funnel-web spider, [2] is a species of spider belonging to the family Agelenidae and the genus Agelenopsis.It is found in dry and arid regions across the southern United States and into northwestern Mexico.
The spider sits at the back of the funnel shape, waiting for prey to disturb the web. When the silk threads in the web are disturbed vibrations are sent to the spider, notifying the spider there is prey at the mouth of the funnel. The spider will rush out and attack the prey item, dragging it back to the back of the funnel to consume its meal ...
There are 36 of them and some are dangerous as they produce a fast-acting and highly toxic venom. Male Atrax robustus spiders (Sydney funnel-web spiders) are responsible for over 10 deaths a year ...
Agelenopsis pennsylvanica, commonly known as the Pennsylvania funnel-web spider or the Pennsylvania grass spider, is a species of spider in the family Agelenidae. The common name comes from the place that it was described, Pennsylvania, and the funnel shape of its web. [1] [2] Its closest relative is Agelenopsis potteri. [1]
Agelenopsis, commonly known as the American grass spiders, is a genus of funnel weavers described by C.G. Giebel in 1869. [1] They weave sheet webs that have a funnel shelter on one edge. The web is not sticky, but these spiders make up for that by running very rapidly. The larger specimens (depending on species) can grow to about 19 mm in body ...
Only male Sydney funnel-web spiders have venom that can kill an adult, and 13 deaths have been attributed to the common Sydney funnel-web spider between 1927 and the early 1980s.
Phoneutria nigriventer, the Brazilian wandering spider (a ctenid spider) is a large brown spider similar to North American wolf spiders in appearance, although somewhat larger. It has a highly toxic venom and is regarded (along with the Australian funnel-web spiders) as among the most dangerous spiders in the world. [6]