Woodlouse Spider

Scientific Name: Dysdera crocata

Order & Family: Order: Araneae; Family: Dysderidae

Size: Body length: 9 to 15 mm (females are larger than males).

Woodlouse Spider

Natural Habitat

Damp, dark places under logs, rocks, or leaf litter, often near buildings or gardens where woodlice are present.

Diet & Feeding

Strictly carnivorous; specializes in eating woodlice (sowbugs/pillbugs), using large chelicerae to pierce their hard exoskeletons.

Behavior Patterns

Nocturnal hunters that do not spin webs for catching prey. They spend the day in silk retreats and emerge at night to actively hunt.

Risks & Benefits

Benefits the ecosystem by controlling woodlouse populations. They are not dangerous to humans, but if handled, can deliver a sharp, painful bite that may cause minor localized itching or swelling.

Identified on: 4/11/2026