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Unread postPosted: Mon Apr 25, 2005 12:46 pm 
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Guinea Pig wrote:
@Bert: Whenever you see one of those little black ones with white markings - I let them climb onto my hand or arm and tease them. They are SO cute. They get onto their back legs and look REALLY mean. :wink:


If u r colourblind then best is to leave any small black spiders with white markings on their body alone. Those white could be red and then u r in for an unpleasent surprise courtesy of the Black Widow.

Guinea Pig wrote:
Is there any truth in the belief that they are actually deadly poisonous but too small to get hold of you properly?


Which ones? Those little black ones with white markings? Dunno.

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Unread postPosted: Mon Apr 25, 2005 12:52 pm 
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Guinea Pig wrote:
@Bert: Whenever you see one of those little black ones with white markings - I let them climb onto my hand or arm and tease them. They are SO cute. They get onto their back legs and look REALLY mean. :wink:



Over here we have what we call zebra spiders.
Look a lot like yr description. They are jumpy spiders and can
be found on walls for eg. Like to tease them. They perform as
u descriped. Look a bit like grumpy old men

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Unread postPosted: Mon Apr 25, 2005 1:45 pm 
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Can one find black widow in SA ?


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Unread postPosted: Mon Apr 25, 2005 1:50 pm 
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The saffies can correct me if i am wrong but they are
in Kruger
Find something on the net when being bitten
http://www.emedicinehealth.com/articles/6436-1.asp

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Unread postPosted: Mon Apr 25, 2005 1:55 pm 
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Yes, it is one of our prize spiders. A true Angel member aswell, as she'll eat her husband after mating with him.


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Unread postPosted: Mon Apr 25, 2005 1:56 pm 
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Oh, definitely Elana. The brown variety is more common but the black widow is still all over. In Gauteng I've always seem to find them in dusty garages.

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Unread postPosted: Mon Apr 25, 2005 1:57 pm 
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Thanks for those quick answers even if I would have prefered a "no you don't find them in SA" !
:?
Does someone have a list of dangerous spiders in SA ?


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Unread postPosted: Mon Apr 25, 2005 1:58 pm 
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We do have a kind of Black Widow but contrary to belief they rarely cause death - only with elderly and children. The bite is extremely painful but treatable. The ones to be scared of in SA is the Violin Spider and the Crab Spider (not sure about the name?).


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Unread postPosted: Mon Apr 25, 2005 2:00 pm 
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Bert's link wrote:
Two species are common to the United States.

That set me to thinking that there might be a different one in SA of course, and it is:

Quote:
Background: Widow spiders belong to the genus Latrodectus and include the black widow spider (Latrodectus mactans mactans) in the United States. The term widow spider is used because not all species in the genus Latrodectus are black. Other widow spiders in North America include the brown widow (Latrodectus geometricus), the red-legged widow (Latrodectus bishopi), Latrodectus variolus, and Latrodectus hesperus. The redback spider (Latrodectus hasselti) is endemic to Australia. Latrodectus mactans tredecimguttatus and Latrodectus pallidus are found in Europe and South America, and the button spider (Latrodectus indistinctus) is found in South Africa.

The adult female black widow spider is approximately 2 cm in length and shiny black with a red-orange hourglass or spot on the ventral abdomen. The male is much smaller, brown, and incapable of envenomating humans. Juvenile females are also brown but have the general body morphology of the adult. Males and juveniles have a pale hourglass shape, similar to adult females. The female sometimes eats the male during or after copulation. Webs are irregular, low-lying, and commonly seen in garages, barns, outhouses, and foliage. Other widow spiders are generally black but may have red spots, such as Latrodectus mactans tredecimguttatus, or a dorsal red stripe, such as the redback spider. Latrodectus geometricus is brown with red and yellow markings.

Pathophysiology: Alpha-latrotoxin causes the toxic effects observed in humans by opening cation channels (including calcium channels) presynaptically, causing increased release of multiple neurotransmitters. This results in excess stimulation of motor endplates with resultant clinical manifestations. Clinically, the predominant effects are neurological and autonomic, in contrast to the dermonecrotic local effects associated with spiders causing necrotic arachnidism (eg, brown spiders [Loxosceles species]).

Frequency:

In the US: Approximately 2500 widow spider bites were reported to the American Association of Poison Control Centers (AAPCC) in 2001, although this figure is probably conservative because of underreporting.

Mortality/Morbidity: In the United States, an average of 4 deaths per year are reported to occur as a result of spider bites. However, no deaths caused by widow spider envenomation have been reported to the AAPCC since its first annual report in 1983. A recent death was reported after a black widow spider bite in Greece.

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Unread postPosted: Mon Apr 25, 2005 2:03 pm 
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Guinea Pig wrote:
We do have a kind of Black Widow but contrary to belief they rarely cause death - only with elderly and children. The bite is extremely painful but treatable. The ones to be scared of in SA is the Violin Spider and the Crab Spider (not sure about the name?).


Like I said earlier, the violin gave me a good few weeks free school holiday in 1993. The scars have yet to heel.

Our most venomous spider in South Africa, the black widow only lives for about one year.

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Unread postPosted: Mon Apr 25, 2005 2:05 pm 
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Just got this from Vincent Carruthers' Wildlife of Southern Africa:

Black Widows: Neuro-toxin causes severe pain at the site of the bite, muscle disfunction, heart palpitations, stomach ache, difficult breathing, nausea and severe anxiety. If untreated it may lead to death, but it's rare. Get immediate medical aid. Others like the brown one isn't as poisonous.

This is originally in Afrikaans, I hope I got the quick translation right.


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Unread postPosted: Mon Apr 25, 2005 2:05 pm 
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Here is some more info on these little angels:

:littleangel:

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Unread postPosted: Mon Apr 25, 2005 2:16 pm 
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I definitly HATE spiders!!!!


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Unread postPosted: Mon Apr 25, 2005 2:35 pm 
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I don't. I think spiders are kinda cute. 8)


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Unread postPosted: Mon Apr 25, 2005 2:42 pm 
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I like them too, Gwen. They're like snakes - the more you know about them the less scary they become. Just show them some respect. 8)


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