VU

sysiharjakas

Wormaldia subnigra

Unknown

Overview

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

Wormaldia subnigra faces significant threats from water pollution and habitat degradation affecting the clean, fast-flowing streams it requires for survival. Agricultural runoff, urban development, and industrial activities have compromised water quality in many of its known locations. Climate change poses additional risks through altered precipitation patterns and increased water temperatures that could disrupt the delicate aquatic ecosystems this caddisfly depends upon.

Threat summary

Habitat

Wormaldia subnigra inhabits clean, fast-flowing streams and rivers with rocky substrates in forested areas. The larvae require well-oxygenated water with minimal pollution levels and develop in the spaces between stones and gravel on the streambed.

Other threatened species in Philopotamidae

VU

Wormaldia occipitalis

Unknown

Threatened in Åland Islands

Calidris ferrugineaVU

Calidris ferruginea

Declining
Scarce BlackneckCR

Scarce Blackneck

Lygephila craccae

Unknown
EN

knopphodeedderkopp

Walckenaeria nodosa

Unknown
EN

Dolichopus notatus

Unknown

Frequently asked questions

Why is sysiharjakas classified as Vulnerable?
sysiharjakas is classified as Vulnerable because the population is declining and the species faces a high risk of extinction in the medium-term future if current pressures continue. Wormaldia subnigra faces significant threats from water pollution and habitat degradation affecting the clean, fast-flowing streams it requires for survival. Agricultural runoff, urban development, and industrial activities have compromised water quality in many of its known locations. Climate change poses additional risks through altered precipitation patterns and increased water temperatures that could disrupt the delicate aquatic ecosystems this caddisfly depends upon.
Where does sysiharjakas live?
sysiharjakas occurs in Åland Islands, Austria, Croatia, Czechia, Estonia, and Finland (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 sysiharjakas?
The main threats to sysiharjakas 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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