Woodlouse spider

The woodlouse spider (*Dysdera crocata*) is a species of hunting spider known for preying primarily on woodlice.

The woodlouse spider (Dysdera crocata) is a species of hunting spider known for preying primarily on woodlice. It has a reddish body, large forward-pointing fangs, and is found in many temperate regions, often in damp habitats and sometimes indoors.

Taxonomy and naming

The woodlouse spider is Dysdera crocata, a species in the family Dysderidae. Its common name comes from its main prey, woodlice.

Description

This spider is usually reddish or orange-brown with a pale abdomen and prominent fangs. Sources describe it as a small spider, generally around 10–15 mm in body length.

Habitat and distribution

The species is associated with warm, damp microhabitats such as under stones, logs, and leaf litter, and it may also occur indoors in basements or other moist spaces. It is reported from many parts of Europe and has been introduced widely, including to North America.

Diet and behaviour

Woodlouse spiders are nocturnal hunters that actively search for woodlice rather than using capture webs. Their mouthparts are adapted to penetrate the hard exoskeleton of their prey.

Interaction with humans

Woodlouse spiders may bite if handled, and the bite can be painful, but it is generally not considered dangerous to humans. They are typically regarded as non-aggressive and are often encountered incidentally.