Microscopy, Electron, Scanning, Acari - physiology, Male, Rivers, Alabama, Larva - ultrastructure, Animals, Ovum - physiology, Female, Nymph - ultrastructure, Larva - physiology, Unionidae - parasitology, Acari - ultrastructure, Biological research, Pathology, Larvae, Insects, Mussels, Mites, Physiological aspects, Host-parasite relationships, Research, Heal...