Grammotaulius nitidus
Local name: kalvasviirusirvikäs
The kalvasviirusirvikäs (Grammotaulius nitidus) is a caddisfly species whose larvae construct distinctive cases from small stones and sand grains in cold, clear water environments. Adults are characterized by their golden-brown wings with intricate venation patterns and emerge during brief summer periods.
18
Countries
Taxonomy & Classification
Kingdom
Animalia
Phylum
Arthropoda
Class
Insecta
Order
Trichoptera
Family
Limnephilidae
Genus
Grammotaulius
Grammotaulius nitidus belongs to the family Limnephilidae, order Trichoptera, within the Insecta class.
Species Profile
The kalvasviirusirvikäs (Grammotaulius nitidus) is a caddisfly species whose larvae construct distinctive cases from small stones and sand grains in cold, clear water environments. Adults are characterized by their golden-brown wings with intricate venation patterns and emerge during brief summer periods. This species plays a crucial role as both a detritivore in its larval stage and as prey for fish, birds, and other aquatic predators.
Grammotaulius nitidus faces severe population declines primarily due to habitat degradation from water pollution, agricultural runoff, and urban development affecting its freshwater ecosystems. Climate change is altering water temperatures and flow patterns in the streams and rivers this caddisfly depends on for reproduction and larval development.
Key Facts
Habitat & Distribution
This species inhabits pristine, cold-water streams and springs with rocky substrates and consistent year-round temperatures below 15°C. The larvae require well-oxygenated waters with stable flow patterns and abundant organic matter deposits among cobble and gravel beds.
Threats
IUCN Red List: Endangered
Grammotaulius nitidus faces severe population declines primarily due to habitat degradation from water pollution, agricultural runoff, and urban development affecting its freshwater ecosystems. Climate change is altering water temperatures and flow patterns in the streams and rivers this caddisfly depends on for reproduction and larval development.
Agricultural runoff and pesticide contamination
Water pollution and eutrophication
Climate change affecting water temperature and flow
Stream channelization and dam construction
Urban development and habitat fragmentation
Found in 18 Countries
Community Sightings
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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). Grammotaulius nitidus (Grammotaulius nitidus). SpeciesRadar: Intelligence for Earth's Biodiversity. Available at: https://speciesradar.org/species/kalvasviirusirvikas