Brown recluse spider bites can cause large skin ulcers and may take several months to heal.Most brown recluse spiders are found in the western and southern United States, but they have expanded their range to other regions.
Brown Recluse Spider
Brazilian wandering spiders, also known as banana spiders, have a venom that can affect the nervous system and cause symptoms such as salivation, irregular heartbeat, and painful erections.
Brazilian Wandering Spiders
Yellow Sac Spider
Yellow sac spiders, commonly found indoors, have venom that can produce redness and swelling at the bite site.While rare, yellow sac spider bites may result in necrotizing lesions, although severe reactions are uncommon.
Wolf spiders are known for their running speed and can commonly be found in grass or under stones.Although their bites are not considered dangerous, wolf spiders have large fangs that can cause physical trauma and may result in symptoms similar to a bee sting.
Wolf Spider
Black widow spiders are responsible for numerous visits to poison control centers each year and can cause severe muscle pain, cramping, and nausea.While potentially fatal to very small children and the elderly, deaths from black widow spider bites are rare in the United States.
Black Widow Spider
Brown widow spiders, considered an invasive species in many regions, have venom that is more potent than that of black widows.Brown widow bites typically inject a small amount of venom, and while deaths are rare, they have been associated with fatalities in certain circumstances.
Brown Widow Spider
Red widow spiders, primarily found in central and southern Florida, have bites that produce symptoms similar to those of black widow spiders.Although not considered aggressive, red widow spiders may bite when protecting their eggs or when trapped against a person's skin.
Red Widow Spider
Redback spiders, native to Australia, have venom that can cause pain, rapid heartbeats, and swollen lymph nodes.While not aggressive, redback spiders can bite when threatened or trapped, and symptoms depend on the amount of venom injected.
Redback Spider
Funnel-web spiders are known for their funnel-shaped webs and venomous bites.Species such as Atrax robustus and A. formidabilis in Australia are particularly feared due to their aggressive nature and venomous bites, which have caused human deaths.