EN

Triangle Pigtoe

Fusconaia lananensis

Declining

Overview

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

Fusconaia lananensis faces severe population declines primarily due to habitat degradation from agricultural runoff and sedimentation in its river systems. Dam construction and water diversions have altered natural flow regimes essential for reproduction and juvenile recruitment. Invasive zebra mussels compete for resources and filter feeding space, while pollution from urban and industrial sources continues to degrade water quality in remaining habitat areas.

Threat summary

Habitat

This freshwater mussel inhabits clean, flowing rivers and streams with stable gravel and sand substrates in the southeastern United States. It requires well-oxygenated waters with moderate to swift currents and depends on specific fish hosts for larval development and dispersal.

Wetlands (inland)· major

Conservation measures underway

Species recoveryLegislation

Other threatened species in UNIONIDAE

VU

Brazzaea anceyi

Unknown
Dromus dromasCR

Dromus dromas

Unknown
EN

Potomida littoralis

Declining
EN

Potomida acarnanica

Declining

Frequently asked questions

Why is Triangle Pigtoe classified as Endangered?
Triangle Pigtoe 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. Fusconaia lananensis faces severe population declines primarily due to habitat degradation from agricultural runoff and sedimentation in its river systems. Dam construction and water diversions have altered natural flow regimes essential for reproduction and juvenile recruitment. Invasive zebra mussels compete for resources and filter feeding space, while pollution from urban and industrial sources continues to degrade water quality in remaining habitat areas.
Where does Triangle Pigtoe live?
Triangle Pigtoe occurs in across multiple regions. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Triangle Pigtoe?
The main threats to Triangle Pigtoe 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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