What is mean by a Black widow?

Question

with name reason plz.

Answer 1

Black Widow Spiders

Genus: Latrodectus
Phylum: Arthropoda
Sub Phylum: Chelicerata
Class: Arachnida
Order: Araneae
Sub Order: Labidognatha
Family: Therididae
Species: 6

Geography – Range

Black Widow spiders inhabit most of the warmer regions of the world to latitude of about 45 degrees N. and S. They occur throughout all four deserts of the American Southwest.


Widow spiders (Genus Latrodectus) are the best known and largest of the Cobweb Weavers (Family Therididae). All widows are venomous, though not all can cause injury to humans. Black Widows comprise about six species and inhabit most of the warmer regions of the world to a latitude of about 45 degrees N. The female black widow spider, though it is the most venomous spider in North America, seldom causes death as it injects a very small amount of poison when it bites. Reports indicate human mortality at well less than 1% from black widow spider bites.

The species L. hesperus is common in the western US and is the Black Widow found in the North American deserts. L. mactans is the Black Widow common in the eastern and central US. The Brown Widow Spider, L. geometricus, is also found in the US.

The female Black Widow is shiny black, usually with a reddish hourglass shape on the underside of her spherical abdomen. Her body is about .5 inches long, 1.5 inches when the legs are spread. Adult males are harmless to humans, about half the female's size, with smaller bodies, and longer legs and usually have yellow and red bands and spots over the back as do the immature stages.

Newly hatched spiderlings are predominately white or yellowish-white, gradually acquiring more black and varying amounts of red and white with each molt. Juveniles of both sexes resemble the male and are harmless to humans.

Caution - Venomous!

The venom of the female black widow spider is 15 times as toxic as the venom of the Prairie Rattlesnake. Only a minute amount of the toxin is injected in a single bite by the spider however, so they are rarely fatal. By comparison, the relatively large amount of injected rattlesnake venom results in about 15 to 25 percent mortality among those bitten.

The bite itself is often not painful and may go unnoticed. But the poison injected by the the Black Widow bite can cause abdominal pain similar to appendicitis as well as pain to muscles or the soles of the feet. Other symptoms include alternating salivation and dry-mouth, paralysis of the diaphragm, profuse sweating and swollen eyelids.

Persons with heart conditions or other health problems may require a hospital stay. (Heart and lung failure may result in death.) A physician can evaluate the severity of the bite, and give specific antivenin or calcium gluconate to relieve pain if necessary. Healthy people recover rapidly in two to five days.

Answer 2

A black widow is one of the most, if not THE most, poisonous spiders in the world. It is called a black widow because, like a surprisingly large number of various bugs (arachnids and insects alike), the black widow female kills the male after mating. This spider is recognizable by it's shiny black colour, spindly legs and a bright red hourglass on its back. They can be lethal to humans although with modern day medicine, if help is sought immediately the chances for survival are very, very high (unless an allergic reaction occurs, then you have a serious problem as most anti-venoms are made with the same active ingridients as the venoms and if that's what you're allergic to then obviously giving you the anti-venom would just be worsening the situation).

Answer 3

Black widow is a type of spider that after mating the female kills and eats the male. Does that give you some clue?

Answer 4

A black widow is a kind of poisonous spider. They aren't very big, and they can be recognized through being black with a red hourglass shape on them. While they will generally not bite unless provoked, and their bites are very rarely fatal, they can make you quite sick, so it is a good idea to avoid them if possible.

You can read more about them here:
http://en.wikipedia.org/wiki/Black_widow

Answer 5

A black widow is a poisonous spider and a women that's some sort of gold digger.

Answer 6

In what context? Besides the spider...

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http://en.wikipedia.org/wiki/Black_Widow