Epioblasma penita
CR

Epioblasma penita

Declining

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

Overview

Epioblasma penita, the southern combshell or penitent mussel, is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.

Epioblasma penita faces severe threats from habitat degradation caused by dam construction, channelization, and sedimentation in its Tennessee River system habitat. Water quality deterioration from agricultural runoff and urban development has further compromised the mussel beds essential for this species' survival. The species' specialized reproductive strategy, requiring specific fish hosts for larval development, makes it particularly vulnerable to disruptions in aquatic ecosystem integrity.

Threat summary

Habitat

Epioblasma penita inhabits clean, flowing waters of medium to large rivers in the Tennessee River drainage system. This freshwater mussel species requires stable gravel and sand substrates in well-oxygenated waters with moderate current flow.

FRESHWATER· major

Other threatened species in UNIONIDAE

VU

Brazzaea anceyi

Unknown
Lampsilis higginsiiEN

Lampsilis higginsii

Unknown
CR

Recovery Pearly Mussel

Elliptio nigella

Declining
EN

Triangle Pigtoe

Fusconaia lananensis

Declining

Threatened in United States

VU

Lepiota echinella

Unknown
VU

Paddlefish

Polyodon spathula

Unknown
VU

Copper Shark

Carcharhinus brachyurus

Declining
EN

Lyophyllum deliberatum

Unknown

Frequently asked questions

Why is Epioblasma penita classified as Critically Endangered?
Epioblasma penita 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. Epioblasma penita faces severe threats from habitat degradation caused by dam construction, channelization, and sedimentation in its Tennessee River system habitat. Water quality deterioration from agricultural runoff and urban development has further compromised the mussel beds essential for this species' survival. The species' specialized reproductive strategy, requiring specific fish hosts for larval development, makes it particularly vulnerable to disruptions in aquatic ecosystem integrity.
Where does Epioblasma penita live?
Epioblasma penita occurs in United States. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Epioblasma penita?
The main threats to Epioblasma penita 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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