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Alasmidonta varicosa (Lamarck, 1819)
Brook Floater

Brook Floater collected from Rocky River, North Carolina. Photo by staff (Georgia DNR – Wildlife Resources). Specimen courtesy of Georgia Museum of Natural History (GMNH9403).
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Federal Protection: No US federal protection

State Protection: No Georgia state protection

Global Rank: G3

State Rank: S2

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: High Conservation Concern

Element Occurrences (EOs) in Georgia: 1

Habitat Summary for element in Georgia: Medium rivers and creeks with gravel and boulders

SWAP 2025 Threat Matrix

Threat 1 Threat 2 Threat 3
General Threat Climate change & severe weather Human intrusions & disturbance Invasive & other problematic species, genes & diseases
Specific Threat None Recreational activities Invasive non-native/alien species/diseases

SWAP 2025 Conservation Actions:

  • Action 1: Monitor SGCN mussels and mussel community
  • Action 2: Protect SWAP priority watersheds through land acquisition and easements
  • Action 3: Support Better Backroads Program to protect Aquatic SGCN from sedimentation
  • Action 4: Conduct aquatic species outreach in high priority watersheds
  • Action 5: Research genetics and taxonomy
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