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Latrodectism (/ l æ t r ə ˈ d ɛ k t ɪ z əm /) is the illness caused by the bite of Latrodectus spiders (the black widow spider and related species). Pain, muscle rigidity, vomiting , and sweating are the symptoms of latrodectism.
Latrodectus hesperus, the western black widow spider or western widow, is a venomous spider species found in western regions of North America. The female's body is 14–16 mm (1/2 in) in length and is black, often with an hourglass-shaped red mark on the lower abdomen. This "hourglass" mark can be red, yellow, and on rare occasions, white.
They are small to medium-sized spiders found near the ground of eucalypt forest in small sheet webs. The species of this family are only present in Australia and Papua New Guinea. In most cases the cephalothorax and legs are uniformly red and the abdomen black, for which these species are sometimes called the "red and black spiders".
Nicodamus peregrinus, known as the red and black spider, is a spider found in eastern and southern Australia. [1] Unlike the redback spider (Latrodectus hasseltii), the bright red colouration does not appear to warn of significant danger to humans. Food is a variety of small insects.
Steatoda capensis is a spider originating from South Africa.Its common names include the black cobweb spider, brown house spider, cupboard spider and due to its similarities to the katipō spider it is commonly known as the false katipō in New Zealand. [1]
Entelegyne: A spider whose female has an epigyne and separate ducts leading to spermathecae for sperm storage and to the uterus for fertilization, [6] creating a "flow-through" system; see haplogyne; see also Entelegynae; Basic arrangement of spider eyes, viewed from above Arrangement of eyes in most Salticidae, viewed from above
The Sydney funnel-web spider is a relative with a much more potent neurotoxic venom. Trapdoor spiders, many of which resemble tarantulas but are shinier and less hairy, also have large fangs that deliver painful bites, but have very mild venom. Mexican Red Knee tarantula (Brachypelma sp.), a new-world species
Latrodectus mactans, known as southern black widow or simply black widow, and the shoe-button spider, [citation needed] is a venomous species of spider in the genus Latrodectus. The females are well known for their distinctive black and red coloring and for the fact that they will occasionally eat their mates after reproduction.
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