Eratigena atrica

Eratigena atrica, also known as the giant house spider, is a species of spider commonly found in Europe and North America. As the name suggests, this spider is large and can be intimidating, but it is not harmful to humans.

Appearance and Characteristics

Eratigena atrica is a relatively large spider, with females typically measuring around 18mm in length and males around 13mm. They have long, hairy legs and a brownish-grey body with a distinctive chevron pattern on the abdomen. The male spiders are usually lighter in color than the females.

Habitat and Distribution

Eratigena atrica is a common spider species that can be found throughout much of Europe and North America. They prefer to live in dark, quiet areas such as attics, basements, and sheds. These spiders are often found in homes, where they can be seen scurrying across floors or walls. They are also known to build webs in corners and crevices.

Behavior and Diet

Eratigena atrica is a nocturnal spider and is most active at night. During the day, they hide in dark corners or under objects. They are not aggressive and will typically run away if disturbed. These spiders feed on a variety of insects, including flies, moths, and beetles.

Role in Ecosystem

Eratigena atrica plays an important role in the ecosystem as a predator of other insects. They are a natural form of pest control and can help keep populations of other insects in check. In addition, these spiders are also an important food source for other predators, such as birds and lizards.


Eratigena atrica is a common and harmless spider that is often found in homes and other buildings. While they can be intimidating due to their size, they pose no threat to humans and are actually beneficial as a form of pest control. If you encounter one of these spiders, it is best to simply leave it alone and let it continue on its way.

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