While I was away recently, there was discussion on the Web about the
dangers of spiders in Britain. My first encounter with a spider that bit
was in France when I was fourteen. At the time I was into geology, and
picked up a piece of rock and started to examine it. After perhaps a
minute, I felt a piercing sensation on my hand under the rock. I looked
under the rock to see a medium sized spider biting me. It gave me a
considerable shock. Whether it was a direct effect from the bite, or an
emotional response I do not know, but I did feel rather flushed and
dizzy.
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Araneus diadematus
Garden Orb Spider
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More recently my wife picked up that very attractive green spider
Araniella cucurbitana
and to her surprise, it gave her a nasty nip that was really quite
unpleasant. Even more unpleasant was a nip from a harvestman that was
nestling in a pot of chamomile she had bought from a local garden
centre. I had never heard of harvestmen biting humans, but this
particularly bite caused pain, and unpleasantness for some time.
Certainly I have heard that other orb spiders, and house spiders belonging to
Tegenaria can bite, but have only heard very occasionally from people who have experienced bites.
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Aphanopelma hentziTexas Brown Tarantula |
Perhaps one of the most alarming group of spiders on
their appearance are the bird eating spiders, often erroneously called
Tarantulas. People with experience of them are quite prepared to allow
them to walk all over them. It appears that if bitten by them, the
experience is not lethal, but on a par with the sting of a bee. It
probably comes as a bit of a shock that there are as many as thirty-two
species of black widow spider, and one, the Mediterranean Black Widow
Latrodectus tredecimguttatus
is not uncommon, and may be responsible for the Spanish dance, the
tarantella, inspired by the death throws of someone having been bitten.
However there is another black widow that occurs in Spain,
Latrodectus lilianae
which is common there. Australian spiders are noted for their dangerous
habits. The Australian Redback Spider is in fact a black widow
Latrodectus hasseltii.
In spite of the world being full to abundance with so many potentially
lethal creatures, they do not appear to have even the slightest negative
effect on tourism, and certainly mortality from them rarely features in
newspapers. Had a holiday maker in the Mediterranean received a fatal
black widow bite, it would surely have been reported. The fact is,
venomous spiders have to be positively encouraged to bite and most are
unaggressive. Black widows are so called, not because they create widows
amongst humanity, but because the male does not survive his act of
reproduction.
This summer, we were plagued by enormous numbers of lesser house flies
Fannia canicularis.
On occasions the kitchen was home to literally hundreds, and the
spiders that lived with us in the house became much appreciated allies,
and a few local characters. In the sitting room, there was Shelob, named
after the character in Lord of the Rings. She lives in a small hole in a
flower stand, produced an intricate web with a characteristic funnel,
and frequently stands, upside down close to her hidey hole as we watch
television.
Another well watched creature is Spid. Spid
appeared in about May as a tiny creature. He inhabited a tiny corner
between the wall and the ceiling. He could be observed while I enjoyed
an early morning cup of coffee. A record breaking move by him would
total about an inch. Then one day he disappeared. He was away for about a
fortnight, and during that time I anxiously hoped he was okay. Suddenly
he reappeared, and now a little more active and slightly bigger, he
actually strayed perhaps as much as six inches only to disappear again.
He is now back in residence having returned from a walkabout something
like a fortnight ago. Our house seems to be inhabited by Spid and his
relatives, now down to about four individuals, the occasional
Tegenaria who appears unannounced in the bath and Daddy Longlegs Spiders,
Pholcus phalangioides.
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Pholcus phalangioides
Daddy Longlegs Spider
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Pholcus spiders are brilliant hunters and have been
responsible for the demise of several of Shelob’s relatives. Their
technique is to create subtle shivers in a web, and this encourages the
web’s owner to emerge, thinking prey is available.
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Tegenaria sp.
House Spider
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At one time, a large
Tegenaria took up
residence behind our washbasin plinth. He was an expert fly catcher, and
we christened him Charlie. On one occasion, it seemed he had been
expelled from his home. I caught him in a jam jar and returned him to
the vicinity of the loo. Immediately Charlie himself came out, and made
short work of the interloper. In the course of time, however Charlie
fell victim to a Daddy Longlegs Spider.
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Steatoda nobilis
False Black Widow |
Very recently, and especially since correspondance concerning the False Widow Spider
Steatoda nobilis
and its potential for causing a most unpleasant bite to humans, I have
taken photographs of a relative of Spid who has a home close to the
kitchen window. His identification is unequivocal: he is a false widow,
Steatoda nobilis.
Actually he is probably a female, given that his markings are so
strong. I have to admit to rather less warm and cuddly feelings towards
Spid, Shelob and their relatives, however it appears, from studying
their habits on the web, that they have to be positively encouraged to
bite. One method, apparently, is to hold them between thumb and
forefinger and gently squeeze against another part of the hand. Secondly
as they have poor eyesight, gentle encouragement with a finger by
vibrating the web, will encourage them to come out and bite. In a
nutshell, they only really bite if provoked or in defence of themselves.
Apparently
Steatoda nobilis
is not a British native, but was introduced from the Canary Islands or
Madeira, where it is native, some time in the nineteenth century with
bananas. They are still more or less confined to southern counties,
however are expected to spread north. It is now present in western
Europe where it is expected to spread. Reports of False Widow bites do
appear from time to time in the media, but most are sensationalised. As
with bee stings, a few unfortunate people are badly affected by false
widow bites, however to most, the effects may be painful, but are almost
always harmless in the long term.
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