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Stegodyphus dumicola, commonly known as the African social spider, is a species of spider of the family Eresidae, or the velvet spider family. It is native to Central and southern Africa . This spider is one of three Stegodyphus spiders that lives a social lifestyle ( S. lineatus , S. mimosarum , and S. dumicola ).
Black widows make irregular or asymmetric webs, Medline Plus says, and the spiders can bite people when humans bump into their webs. The spiders also typically stay within a few feet of ground level.
Spider chelicerae. The chelicerae are shown in black, the surface of the cephalothorax in brown, the legs in reddish brown, and the venom glands and surrounding muscle tissue in green. The fang portion of the right chelicera can be seen projecting into the space between the two chelicerae.
Intense pain, muscle stiffness, possible nausea, and vomiting are the telltale signs of a black widow spider bite, and these symptoms will likely occur within a few hours after being bitten ...
The widow spiders (genus Latrodectus), such as the black widow, redback spider, and katipÅ are spiders that carry a neurotoxic venom [18] which can cause a set of symptoms known as Latrodectism. Widow spiders are large, shiny house spiders with relatively spindly legs and deep, globular abdomens.
In most species the spiracles can be opened and closed in an efficient manner to admit air while reducing water loss. In various species, this is done by a wide range of mechanisms, such as elastic closure, and closer muscles surrounding the spiracle or kinking the tube. In some the muscle relaxes to open the spiracle, in others to close it.
The trachea were originally connected to the surroundings through a pair of openings called spiracles, but in the majority of spiders this pair of spiracles has fused into a single one in the middle, and moved backwards close to the spinnerets. [13] Spiders that have tracheae generally have higher metabolic rates and better water conservation. [17]
Meaning, you should be just fine if a Joro spider bites you. “Unlike black widow and brown recluse spiders, Joro spiders are not considered a threat to human health,” says Jim Fredericks, Ph.D ...