![]() A related species, the brown violin spider (Loxosceles rufescens), is found in Hawaii. In the southern states, it is native from central Texas to western Georgia and north of Virginia. The native range lies roughly south of a line from southeastern Nebraska through southern Iowa, Illinois, and Indiana to southwestern Ohio. The brown recluse spider is native to the United States from the southern Midwest south to the Gulf of Mexico. They may be brown, gray, or a deep yellow color and usually have markings on the dorsal side of their cephalothorax, with a black line coming from it that looks like a violin with the neck of the violin pointing to the rear of the spider, resulting in the nicknames fiddleback spider, brown fiddler or violin spider. The brown recluse spider or violin spider, Loxosceles reclusa, is a well-known member of the family Sicariidae (formerly placed in a family "Loxoscelidae").īrown recluse spiders are usually between 6-20 mm (¼ in and ¾ in), but may grow larger. On the other hand the Brazilian wandering spider requires very little provocation. Funnel web spiders' defensive tactics are aggressive and their venom, although they rarely inject much, has resulted in 13 known human deaths. ![]() Most of those with medically serious bites, such as recluse spiders and widow spiders, are shy and bite only when they feel threatened, although this can easily arise by accident. Most spiders will only bite humans in self-defense, and few produce worse effects than a mosquito bite or bee-sting. As of 2008, approximately 40,000 spider species, and 109 families have been recorded by taxonomists however, there has been confusion within the scientific community as to how all these genera should be classified, as evidenced by the over 20 different classifications that have been proposed since 1900. Spiders are found worldwide on every continent except for Antarctica, and have become established in nearly every ecological niche with the exception of air and sea colonization. They are the largest order of arachnids and rank seventh in total species diversity among all other groups of organisms. Regardless of the bite, if you experience any of the above symptoms and/or believe you've been bitten by one of these four spiders, you should definitely go to the hospital right away.Spiders (order Araneae) are air-breathing chelicerate arthropods that have eight legs, and chelicerae modified into fangs that inject venom. These spiders are pretty timid and rarely bite humans, but if you do get bit you'll experience pain, itching, and swelling for roughly seven to ten days. As their name suggests, these spiders are pale yellow in color with brown markings and an orange stripe that runs down their abdomen. Dangerous Colorado Spiders: Black-Footed Yellow Sac Spiderįinally, the last of these four dangerous Colorado spiders is known as the Black-Footed Yellow Sac Spider. The bite is reportedly less serious than that of a Black Widow and they are a timid species that rarely bites humans, but, again, it's definitely recommended to go to the hospital if bitten. The biggest difference between the Brown Widow and Black Widow is the coloring as both sexes are lighter in color and females have an orange hourglass on their abdomen. The Brown Widow is nearly identical to the Black Widow in that only the females bite humans, they're about the same size, and a bite from one of these spiders can result in pain, muscle rigidity, vomiting, sweating, and even abdomen pain that mimics appendicitis. ![]() ![]() Regardless, you should still go to the hospital if you believe you've been bitten. While a bite from a Brown Recluse is serious, causing things like necrosis, extreme discomfort, and possibly permanent scarring, they're not native to Colorado and rarely survive the winter. These spiders are completely brown in color with a violin-shaped marking on the top of their body. Dangerous Colorado Spiders: Brown RecluseĪnother dangerous spider you've likely heard of in Colorado is the Brown Recluse. However, if you do get bit and are a healthy adult, you'll probably be fine, but you should still go immediately to the hospital as symptoms of a Black Widow's bite include muscle pain, nausea, paralysis of the diaphragm, and trouble breathing. READ MORE: 7 Invasive Colorado Insects You Should Kill Immediately
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