Other Invertebrates (corals, sponges, worms, etc.)
Planaria in a cave stream
Common organisms living within the sediments of Mammoth Cave streams are nematodes or roundworms (undescribed), copepods (Maraenobiotus, Moraria, Nitocra, and Parastenocaris), tardigrades (Macrobiotus), and oligochaete worms (Aeolosoma).