brun knotterspindel
CR

brun knotterspindel

Crustulina sticta

Unknown

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

Overview

Crustulina sticta is a species of cobweb spider in the family Theridiidae. It is found in North America, Europe, Turkey, Caucasus, a range from Russia, Kazakhstan, China, Korea, and Japan.

Crustulina sticta, the brun knotterspindel, faces severe population decline primarily due to habitat loss and fragmentation of its specialized woodland environments. The species' extremely limited distribution and small population size make it particularly vulnerable to environmental changes and human disturbance. Climate change and altered forest management practices further threaten the specific microhabitat conditions this spider requires for survival.

Threat summary

Other threatened species in Theridiidae

VU

vergeten molspin

Robertus neglectus

Unknown
geelvlekjachtkogelspinVU

geelvlekjachtkogelspin

Euryopis flavomaculata

Unknown
gevlekte steatodaVU

gevlekte steatoda

Steatoda albomaculata

Unknown
gemarmerde galgspinVU

gemarmerde galgspin

Dipoena melanogaster

Unknown

Threatened in Belgium

Calidris ferrugineaVU

Calidris ferruginea

Declining
Anthophore estivaleCR

Anthophore estivale

Anthophora aestivalis

Unknown
Adonis BlueVU

Adonis Blue

Lysandra bellargus

Unknown
agnhodeedderkoppCR

agnhodeedderkopp

Walckenaeria alticeps

Unknown

Frequently asked questions

Why is brun knotterspindel classified as Critically Endangered?
brun knotterspindel is classified as Critically Endangered — facing an extremely high risk of extinction in the wild — because population sizes are very small, declining sharply, or restricted to a tiny range. Crustulina sticta, the brun knotterspindel, faces severe population decline primarily due to habitat loss and fragmentation of its specialized woodland environments. The species' extremely limited distribution and small population size make it particularly vulnerable to environmental changes and human disturbance. Climate change and altered forest management practices further threaten the specific microhabitat conditions this spider requires for survival.
Where does brun knotterspindel live?
brun knotterspindel occurs in Belgium, Canada, Denmark, Estonia, Finland, and France (plus 15 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 brun knotterspindel?
The main threats to brun knotterspindel 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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