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Utterbackiana couperiana (Lea, 1840)
Barrel Floater

Barrel Floater collected from the South Edisto River, South Carolina (67 mm). Photo by staff (Georgia DNR – Wildlife Resources). Specimen courtesy of Georgia Museum of Natural History (GMNH8192).
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Federal Protection: No US federal protection

State Protection: No Georgia state protection

Global Rank: G4

State Rank: S3

Element Locations Tracked in Biotics: Yes

SWAP 2015 Species of Greatest Conservation Need (SGCN): No

SWAP 2025 Species of Greatest Conservation Need (SGCN): Yes

2025 SGCN Priority Tier: Moderate Conservation Concern

Element Occurrences (EOs) in Georgia: 7

Habitat Summary for element in Georgia: Ponds or slow-flowing streams in soft substrates of sand, silt, and mud with little to no current.

SWAP 2025 Threat Matrix

Threat 1 Threat 2 Threat 3
General Threat Natural system modifications Pollution Pollution
Specific Threat Dams & water management/use Domestic & urban waste water Agricultural & forestry effluents

SWAP 2025 Conservation Actions:

  • Action 1: Assess SGCN mussels and mussel communities in the Savannah River system
  • Action 2: Assess SGCN mussels and mussel communities in the Ogeechee River system
  • Action 3: Assess SGCN mussels and mussel communities in the St. Mary's River system
  • Action 4: Identify host fish species
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