Spiders of North-West Europe
Nederlandse versie
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Over eighty pages keep 500,000 visitors busy every year. Most pages are translated in Dutch, Polish and some in Esperanto. Many people think spiders are dangerous creatures that should be wiped away with a cloth, sucked up in the vacuum cleaner or smashed with a newspaper. That is not wise because spiders play a very important role in our Eco-system. They catch many annoying and harmful insects, are not destructive and are therefore useful creatures. I receive many questions about poisonous/venomous spiders. Most spiders use venom to kill their prey. Spider venom is almost always harmless to humans. However, there are a few exceptions. In Europe there is one spider, called "Black widow", whose effects of the bite may hurt. The stories about her deadly venom are exaggerated. She lives in the southern parts of Europe. |
![]() Young Dolomedes fimbriatus "fishing" spider. As adult the largest European spider. |

Which spiders can we find around the house? (Many more small spider pictures here ->)
The house spider (Agelenidae) is a famous "scary" spider. In autumn the males are often spotted searching for a female. He runs on his long legs through our house,
especially if we are watching television. Leave him alone and after a few minutes he is gone or eaten by the cat.
The garden spider (Araneidae) is also often seen in her wheel web. To see the glue spitter (Scytodidae) you have to look better.
The daddy longleg (Pholcidae) is the greatest killer inside your house. In winter she almost kills all surviving insects and they even kill their own kin.
An impressive spider often seen in the US is the Argiope aurantia (Family Araneidae). Pictures of Argiopes from different continents can be seen on the following pages: Europe, USA and Australia. In a study, the Panamese wheel spider was observed for a year. It consumed an average of 1.63 insects (= 0.089 g) a day. A study in Great Britain estimated an average of 130.8 spiders living in a meadow per square meter. If we extrapolate this to Holland with 15 million habitants on 36150 square kilometers (4.4 human beings per hectare), we can make the next calculation: spiders living on one hectare consume 116.4 kg of animal material every day. In other words, spiders eat the weight of all humans living in Holland in three days! |
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| Argiope aurantia from the USA |
| Arthropoda | Class Arachnida ![]() Part of the tree of life site |
| Acari, Tick, Ixodes ricinus before and after feeding |
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| Camel or sun spider, Solifugae by Oleg Kucheryavenko |
Pictures and information by family |
Order Araneae - Spiders |
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Sub-order - Orthognatha (Mygalomorphae, primitive spiders) |
| Sub-order Labidognatha (Aranaeomorphae, modern spiders) |
Cribellatae (These spiders have a cribellum and a calamistrum) |
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Order Opiliones - Harvestmen |
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Literature
Because of their big variety in color, shape and size, it is difficult to determine a spider from a picture. The only secure way is to catch the spider and have proper books on identification.
I have tried to give them the right name. If you can correct, E-mail me.
Acknowledgements
E-mail me: Click here
Ed Nieuwenhuys, 19 December 2011
Copyright 1 february 1996-2011