Inland Floater (Mussel) / Fragmented Glochidia
Scientific Name: Pyganodon grandis
Order & Family: Order: Unionida, Family: Unionidae
Size: Adults reach 10-15 cm; larvae (glochidia) are microscopic (approx. 0.3 mm).
Natural Habitat
Found in lakes, ponds, and slow-moving rivers with mud, silt, or sand bottoms across North America.
Diet & Feeding
Filter feeders that consume algae, bacteria, and fine organic detritus from the water column.
Behavior Patterns
Larvae (glochidia) are parasitic; they attach to the gills or fins of host fish to develop before dropping off to begin life as independent mussels.
Risks & Benefits
Excellent ecosystem indicators and water purifiers; they pose no risk to humans and provide essential filtration services to aquatic habitats.
Identified on: 12/30/2025