Family Amblyopsidae - Cavefish Family
Family: Amblyopsidae - These small fishes have very small or nonfunctioning eyes, no or very tiny pelvic fins, a flattened head, anal and urogenital openings under and between the gills, embedded cycloid scales and one dorsal fin. They have large sensory bumps on the head, body and caudal fin which help them to compensate for their poor vision.
spring cavefish (Forbesichthys agassizii)
Photo © Missouri Department of Conservation / Lance Merry