Woodlouse Spider [Dysdera erythrina]
EN

Woodlouse Spider [Dysdera erythrina]

Dysdera erythrina

Unknown

Photo: Wikimedia Commons (CC) via https://en.wikipedia.org/wiki/Dysdera_erythrina

Overview

A detailed profile for this species is sourced from the IUCN Red List of Threatened Species as assessments become available.

The Woodlouse Spider faces severe population declines primarily due to habitat fragmentation and loss of suitable microhabitats in urban and suburban environments. Intensive land development destroys the loose stone walls, garden debris, and undisturbed soil layers essential for both the spider and its woodlouse prey. Chemical pesticide applications in residential areas directly impact both predator and prey populations, while climate-driven changes in moisture regimes affect the humid conditions required for successful reproduction.

Threat summary

Habitat

Dysdera erythrina inhabits loose stone walls, garden rockeries, and areas with accumulated organic debris where moisture levels remain consistently high. The species requires microhabitats that support abundant woodlouse populations, typically found in partially shaded locations with loose soil and stone crevices.

TERRESTRIAL· major

Other threatened species in Dysderidae

Harpactea hombergiEN

Harpactea hombergi

Unknown

Threatened in Algeria

Calidris ferrugineaVU

Calidris ferruginea

Declining
Adonis BlueVU

Adonis Blue

Lysandra bellargus

Unknown
small mallowVU

small mallow

Malva pusilla

Unknown
Blind SnailVU

Blind Snail

Cecilioides acicula

Unknown

Frequently asked questions

Why is Woodlouse Spider [Dysdera erythrina] classified as Endangered?
Woodlouse Spider [Dysdera erythrina] is classified as Endangered — facing a very high risk of extinction in the wild — because population numbers are declining steeply and key habitats are under sustained pressure. The Woodlouse Spider faces severe population declines primarily due to habitat fragmentation and loss of suitable microhabitats in urban and suburban environments. Intensive land development destroys the loose stone walls, garden debris, and undisturbed soil layers essential for both the spider and its woodlouse prey. Chemical pesticide applications in residential areas directly impact both predator and prey populations, while climate-driven changes in moisture regimes affect the humid conditions required for successful reproduction.
Where does Woodlouse Spider [Dysdera erythrina] live?
Woodlouse Spider [Dysdera erythrina] occurs in Algeria, Andorra, Austria, Belgium, Canada, and Czechia (plus 19 other countries). Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Woodlouse Spider [Dysdera erythrina]?
The main threats to Woodlouse Spider [Dysdera erythrina] are ai-1, ai-2, ai-3, and ai-4. The full IUCN-classified threat record for this species is detailed on the species page.

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