In South Africa, widow spiders are also known as the button spiders.  Arachnologist Herbert Walter Levi revised the genus in 1959, studying the female sexual organs and noting their similarity across described species. Currently, there are three recognized species of black widow found in North America: The southern black widow (Latrodectus mactans), the northern black widow (Latrodectus variolus) and the western black widow … The tensile strength for the three kinds of silk measured in the Blackledge study was about 1,000 MPa. The symptoms are “lazy eye”, swollen lips, week muscles, sweating, …  However, such general "common names" are of limited use as the diversity of species is much greater. South Africa, officially the Republic of South Africa, is a country located at the southern tip of Africa. ", "2012 Annual Report of the American Association of Poison Control Centers' National Poison Data System (NPDS): 30th Annual Report", Why Black Widow Spider Venom Is So Potent, "The egg-sac in the Identification of Species of, Description of crossing experiments between various, https://en.wikipedia.org/w/index.php?title=Latrodectus&oldid=994426761, Articles with failed verification from June 2017, Articles containing potentially dated statements from May 2020, All articles containing potentially dated statements, Creative Commons Attribution-ShareAlike License, This page was last edited on 15 December 2020, at 17:41. The male spider has various red or red and white marks on the upper part of the abdomen while the female does not have any bright markings. The six-eyed sand spider belongs to the genus Sicarius, a name that translates as 'murderer' in Latin. Even when they do occur, the rain spider's venom is weak, so that symptoms are no worse than a common bee sting. Sac spiders actively hunt at night and weave together a protective tube of silk to rest in during the day. The black widow spider can grow up to 0.39 inches in size while some female measure about 0.51 inches in body length.  The tensile strength of spider silk is comparable to that of steel wire of the same thickness. They are easily identified by a red blotch in the shape of an hourglass on the underneath of the abdomen. Redback spider. All button spiders belong to the genus Latrodectus, and there are six different species found in Africa. The most prevalent species occurring in eastern Asia and Australia is commonly called the redback (Latrodectus hasselti). [failed verification] However, as the density of steel is about six times that of silk, silk is correspondingly stronger than steel wire of the same weight. It is thought that this species can live for up to a year without eating. But, what is not so widely known is that black widow spider bites hardly ever lead to death here in the United States. Species vary widely in size. Like … , Since the venom is not usually life-threatening, antivenom has been used as pain relief and not to save lives. These incredible creatures are not venomous, but are nevertheless capable of inducing nightmares thanks to their monstrous looks. They are nocturnal and nest under rocks and logs rather than weaving webs. This is Australia's answer to a black widow, the redback spider. Some claim that it is 15 times more powerful than the venom of a rattlesnake. ... South America, Australia and Africa. Button or Black Widow Spider. To feed, the spider's mouth pulses digestive juices over the prey, which liquifies—and then the spider internalizes by capillary action, sucking the slurry into its mouth. 1 History 1.1 Bobbi Morse's Honeymoon 1.2 Mercenaries 1.3 Duel of Johannesburg 1.4 Earthquake 1.5 U.S. Vice President 2 Appearances 3 References 4 External Links Bobbi Morse could not go on her honeymoon with Lance Hunter because she was in the middle of a mission in Johannesburg. The new species is native to the sand forests of South Africa and scientists say it is the biggest spider in Africa - and possibly the world. Beliar spider/Wikimedia Commons/CC BY-SA 4.0. Some can be readily identifiable by reddish markings on the central underside (ventral) abdomen, which are often hourglass-shaped. Four of these are classified as black button or black widow spiders. ... Venom – cytotoxic The infamous Black Widow spider. Only the bites of the females are dangerous to humans. 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