Black widow spiders have been vilified within the world of cinema, causing widespread fear and terror at the sight of one. The female black widow has also been enshrined in human roles to portray a scorned lover that seeks revenge.
The female black widow is widely thought to be the most venomous spider within North America. When compared to rattlesnakes or other venomous creatures, the venom of the female black widow spider remains one of the most toxic around. Though the female black widow is dangerous, males and spiderlings of this species are relatively harmless.
Female black widow spiders are characterized by the large blood red hourglass markings found on their lower abdomen. In some instances, female black widow spiders have been found with an orange-yellow marking instead of blood red. The female black widow abdomen is shiny and black, most often being compared to a marble.
When identifying a female black widow, the hour glass shape is almost certainly a dead giveaway. The eyes of the black widow also take on a unique structure. In black widow species, two horizontal rows of four eyes span the face. The eyes at the ends of each row protrude slightly and have a larger size than the central eyes.
Male black widow spiders take on a slightly different appearance than their female counterparts. While the females are most often a glossy black color, males will typically take on a brown or gray appearance. Both genders, however, still have thick, rounded abdomens that are attached to the thorax. The abdomen in black widow spiders will always match the thorax in color.
The black widow spider is most often found underneath ledges, rock formations, plants and other areas where webs can be constructed. When cold weather arrives black widow spiders will begin seeking shelter inside of structures. This can become an issue when droughts arise as well.
The black widow spider derived its name from the belief that the female cannibalizes the male after mating. This phenomenon has been observed within laboratory settings but has never been observed in the wild. In most cases, male black widow spiders will continue living in the same web as the female without incident.
The web of a black widow spider lacks form and will often appear like they were built erratically. Though their webs lack the structure and shape commonly seen with orb spiders, black widow spiders produce one of the strongest silks among all other arachnids. The webs created by these spiders are incredibly sticky, which is beneficial for trapping prey.
Like most other spiders, the black widow spider is nocturnal in nature and seeks solitude as often as possible. This species is not inherently aggressive, but will defend her web at all costs when necessary. Black widow spiders are notoriously shy and spend most of their time exposing their abdomen within the web.
Female black widows capture their victims within the silk they produce, wrapping it similar to a cocoon. Once completely covered in silk, prey is neutralized with the injection of venom. Though the prey is immediately available for consumption, often the black widow will save them for later feeding.
It is believed that the red hourglass present on female black widow abdomens was formed as a warning sign to keep potential predators away. The idea is that the red will inform predators that the spider is highly venomous. This, however, is not effective in some animals, such as birds, who perceive color differently.
Female black widows are capable of storing sperm from their first mating and can produce more than 10 eggs sacs without mating again. Because of these storing habits the female black widow sees no reduction in egg amounts or mortality rates within the eventual spiderlings. This characteristic helps these often solitary spiders thrive.
The female black widow is considered North America’s most venomous spider, with venom reportedly 15 times stronger than that of a rattlesnake. The most powerful toxins within black widow venom are called latrotoxin, the most potent of which is alpha-latrotoxin. These toxins primarily function to target nervous systems within other insects.
Researchers have discovered that black widow spider venom contains several other toxins that can aid alpha-latrotoxin in its rate of success. Though the venom of a female black widow spider is among the strongest, it isn’t nearly as deadly as other large venomous predators. This is primarily due to the small size of the black widow and the amount of venom it is capable of injecting into a victim when biting.
Generally, humans are only bitten by black widow spiders in the event of accidental contact. When the spider feels threatened it is more likely to attack out of self-preservation. Black widow spiders are passive to humans naturally and often will not go out of their way to attack.
When a human is bitten by a black widow spider, and significant venomization occurs, a syndrome called latrodectism arises. This illness causes symptoms such as sweating, vomiting, muscle tightening and dispersed pain. In most cases, a bite from a black widow spider will only cause localized pain and no other symptoms will form with general treatment. Nearly 75% of all cases involving black widow bites have no venomization or a mild amount that will only cause minor sickness.
In some cases, victims who were unaware of venomization or contact with a black widow spider have been misdiagnosed. The most common misdiagnoses are tetanus or acute abdomen. This often leads to a need for blood values to provide evidence of myocarditis or dehydration from vomiting.
When an individual believes they have been bitten by a black widow spider, it is important to contact a medical professional. Advancements within black widow venom studies have made the likelihood of death almost nonexistent. Though the mortality rate has fallen when dealing with black widow bites, certain medications can be given to ease the symptoms of a black widow bite.
If significant amounts of venom are detected following a bite doctor’s will provide an antivenin. The only known antivenin for the treatment of a black widow venomization is derived from horse serum. This particular antivenin is created by gradually increasing venom injections in a horse, which causes a natural antivenin to be used in human applications.
The current mortality rate for black widow spider bites is often reported anywhere between 5% or the low end at 0.2%. In most cases, victims that have received a bite and developed latrodectism will fully recover with no significant medical problems. Only special complications such as age, immune system functionality and heart problems are present when a death is found.
When dealing with black widow spider prevention, the advice is generally not much different than associated with the average spider. Although the black widow is more feared than the average spider, it is a spider nonetheless. These common spider prevention techniques can help keep black widow spiders out of your home.
Female black widows killing their mate makes for a good T.V. drama, but is more myth than reality. Fact is the male Black Widow is rarely killed by the female. To top it off, the male even lives longer.
We hope this information helps you prevent black widow infestations and keeps your home free from infestations all year long. If you are struggling with a black widow problem in your home or business, give us a call or visit our website to start a no obligation brown recluse evaluation. The talented technicians at Arrow Exterminators can identify any type of pest and identify the best course of treatment to get rid of it. We’ll create a custom pest control plan to make sure we eliminate every last one from your home and keep them away for good! You can call our trained pest control experts at any time with questions about pest control methods or pest prevention techniques. You can also find us on Twitter, Facebook and Google+ for more pest prevention tips and tricks. Contact Arrow Exterminators and our spider control experts will get you the help you need right away. Whether it’s a private residence, dormitory, hotel or any other type of property. Arrow Exterminators has been eliminating spiders all over Oklahoma since 1952. We know spider control.
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