Remasellus parvus, the swimming Florida cave isopod, is an isopod endemic to "4 caves in the Ochlockonee and Aucilla-Suwanee drainages of Florida", United States.
Mississippi River | River Thames | Amazon River | Columbia River | Hudson River | Colorado River | Potomac River | river | Ohio River | Missouri River | Delaware River | Murray River | River Tyne | Madeira River | Volga River | River Nene | River Clyde | River Trent | River Severn | Amur River | River Wear | Allegheny River | Red River | Dnieper River | Yarra River | Paraná River | River Tees | Fraser River | Yangtze River | Tocantins River |
Ivory spear points (often called "foreshafts") are found more frequently in the Aucilla River than everywhere else in North America combined.