liten elvebreddsedderkopp
Arctosa stigmosa
Arctosa stigmosa is a medium-sized wolf spider with distinctive dark markings on its carapace and a mottled brown-gray coloration that provides excellent camouflage against riverbank substrates. This semi-aquatic arachnid plays a crucial role as both predator and prey in riparian ecosystems, hunting small invertebrates along water margins while serving as food for birds and larger arthropods.
14
Countries
Taxonomy & Classification
Kingdom
Animalia
Phylum
Arthropoda
Class
Arachnida
Order
Araneae
Family
Lycosidae
Genus
Arctosa
liten elvebreddsedderkopp belongs to the family Lycosidae, order Araneae, within the Arachnida class.
Species Profile
Arctosa stigmosa is a medium-sized wolf spider with distinctive dark markings on its carapace and a mottled brown-gray coloration that provides excellent camouflage against riverbank substrates. This semi-aquatic arachnid plays a crucial role as both predator and prey in riparian ecosystems, hunting small invertebrates along water margins while serving as food for birds and larger arthropods.
Arctosa stigmosa is declining primarily due to habitat degradation and loss of suitable riverbank environments. Human activities including river regulation, pollution, and development along waterways have significantly reduced the quality and extent of the specialized sandy and gravelly riverbank habitats this species requires.
Key Facts
Habitat & Distribution
This species inhabits the sandy and gravelly shores of fast-flowing rivers and streams, particularly areas subject to natural flooding cycles that create the dynamic sediment conditions it requires. It constructs burrows in loose substrate within the splash zone and areas of seasonal inundation along pristine waterways.
Threats
IUCN Red List: Endangered
Arctosa stigmosa is declining primarily due to habitat degradation and loss of suitable riverbank environments. Human activities including river regulation, pollution, and development along waterways have significantly reduced the quality and extent of the specialized sandy and gravelly riverbank habitats this species requires.
Habitat degradation from human development
River regulation and flow modification
Climate change affecting water levels
Loss of natural riverbank vegetation
Water pollution and contamination
Found in 14 Countries
Community Sightings
Report a sightingNo community sightings yet. Be the first to report!
Sources & Attribution
How to Cite
IUCN: IUCN (2025). The IUCN Red List of Threatened Species. Version 2025-1. Available at: https://www.iucnredlist.org. doi:10.2305/IUCN.UK.2025-1.RLTS
GBIF: GBIF.org (2025). GBIF Home Page. Available at: https://www.gbif.org
This page: SpeciesRadar (2025). liten elvebreddsedderkopp (Arctosa stigmosa). SpeciesRadar: Intelligence for Earth's Biodiversity. Available at: https://speciesradar.org/species/liten-elvebreddsedderkopp