Poeciliidae

least killifish

Heterandria formosa

Three Point Six Centimeters Poeciliid Fish of North American Waters

• Tropical
• Northern Hemisphere
• Restricted distribution
• North America
• Fusiform
• Small
• Tropical fish

Heterandria formosa (known as the least killifish, dwarf topminnow, mosqu or midget livebearer) is a species of livebearing fish within the family Poeciliidae. This is the same family that includes familiar aquarium fishes such as guppies and mollies. Heterandria formosa is not as commonly kept in aquaria as these species.