Flatfishes (Pleuronectiformes) also commonly known as Flounders or Soles, is a biological order of the phylum Chordata (Chordates) and class Actinopterygii (Ray-finned Fishes).
Achiridae
Achiropsettidae
Poecilopsettidae
Pleuronectidae
Bothidae
Citharidae
Paralichthyidae
Scophthalmidae
Soleidae
Psettodidae
Cynoglossidae
Clupeiformes
Lophiiformes
Osmeriformes
Aulopiformes
Batrachoidiformes
Osteoglossiformes
Amiiformes
Siluriformes
Cyprinodontiformes
Anguilliformes
Pleuronectiformes
Gadiformes
Semionotiformes
Zeiformes
Tetraodontiformes
Characiformes
Scorpaeniformes
Cypriniformes
Esociformes
Mugiliformes
Beloniformes
Ophidiiformes
Perciformes
Percopsiformes
Gasterosteiformes
Salmoniformes
Atheriniformes
Acipenseriformes
Synbranchiformes
Elopiformes