Least killifish
- kingdom: Animalia
- phylum: Chordata
- class: Actinopterygii
- order: Cyprinodontiformes
- family: Poeciliidae
- genus: Heterandria
- species: Heterandria formosa
Alafaya- Alva
- Arcadia
- Boca Del Mar
- Bronson
- Campbell
- Crystal River
- Crystal Springs
- Davie
- Dunnellon
- East Lake-Orient Park
- Estero
- Eustis
- Fish Hawk
- Florida Ridge
- Fort Meade
- Glencoe
- Homosassa
- Homosassa Springs
- Immokalee
- Inglis
- Kissimmee
- Lake Panasoffkee
- Lakeland
- Lely
- Macclenny
- Marianna
- Mary Esther
- Midway
- Naples Manor
- Naples Park
- Niceville
- Olga
- Pelican Bay
- Perry
- Pine Manor
- Pine Ridge
- Roseland
- Ruskin
- Saint George
- Samsula-Spruce Creek
- San Carlos Park
- Sanford
- Temple Terrace
- Valparaiso
- Wewahitchka
- Whiskey Creek
- Winter Springs
- Zephyrhills South
Florida- Sandersville
Georgia- Bay Saint Louis
- Diamondhead
- Kiln
- Waveland
Mississippi- Belville
- Castle Hayne
- Kings Grant
- Wilmington
North Carolina
United States