Eratigena duellica, commonly referred to as the Mediterranean house spider, is a species of araneomorph spider found throughout the Mediterranean region and parts of southern Europe. Its habitat is typically found in human-altered landscapes, including urban and agricultural areas. Eratigena duellica is one of the most common spiders in Europe, often living in close proximity to humans.
The Mediterranean house spider is easily identified by its distinctive yellowish-brown colouration and its long, slender legs. Its body length can reach up to 10 mm in length, with males being larger than females. This spider is often mistaken for other species of spiders, such as the common house spider, which is much smaller in size.
Eratigena duellica typically builds its web in sheltered areas such as under eaves, in window frames, and in cracks and crevices. The web is made from a fine, sticky silk and can have a diameter of up to 30 cm. This spider preys on a variety of insects, including mosquitoes, flies, and moths.
Eratigena duellica is an important species in the ecosystem, as it helps to keep insect populations in check. It is also beneficial to humans as it helps to reduce the number of flying insects which can cause irritation and disease. However, the Mediterranean house spider can sometimes enter homes and become a nuisance.
Although not dangerous to humans, Eratigena duellica can bite, which can cause redness, swelling, and itching. It is best to avoid contact with this spider and to call a professional if an infestation is suspected.
In conclusion, Eratigena duellica is a beneficial species of spider found throughout the Mediterranean region. Its web is an important part of the ecosystem, helping to keep insect populations in check. Although sometimes a nuisance in homes, it is not dangerous to humans and can be easily removed with the help of a professional.