1. Small freshwater fish of South America and the West Indies; often kept in aquariums
   - guppy, rainbow fish

Type of: cyprinodont

• family Eschrichtiidae
• family Esocidae
• family Euglenaceae
• family Euphorbiaceae
• family Eurylaimidae
• family Exocoetidae
• family Fabaceae
• family Fagaceae
• family Falconidae
• family Fasciolidae
• family Felidae
• family Filariidae
• family Fissurellidae
• family Fistulariidae
• family Fistulinaceae
• family Flacourtiaceae
• family Forficulidae
• family Formicariidae
• family Formicidae
• family Fouquieriaceae
• family Fregatidae
• family Fringillidae
• family Fucaceae
• family Fulgoridae
• family Fumariaceae