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
Paralichthodidae
Rhombosoleidae
Samaridae
Paralichthyidae
Scophthalmidae
Soleidae
Psettodidae
Cynoglossidae
Albuliformes
Clupeiformes
Lophiiformes
Osmeriformes
Ateleopodiformes
Aulopiformes
Batrachoidiformes
Beryciformes
Osteoglossiformes
Amiiformes
Siluriformes
Ctenothrissiformes
Cyprinodontiformes
Anguilliformes
Pleuronectiformes
Gadiformes
Semionotiformes
Gonorynchiformes
Gymnotiformes
Zeiformes
Lampriformes
Tetraodontiformes
Lepisosteiformes
Characiformes
Scorpaeniformes
Cypriniformes
Esociformes
Mugiliformes
Myctophiformes
Beloniformes
Ophidiiformes
Perciformes
Percopsiformes
Gasterosteiformes
Polymixiiformes
Polypteriformes
Saccopharyngiformes
Salmoniformes
Atheriniformes
Stephanoberyciformes
Stomiiformes
Acipenseriformes
Synbranchiformes
Elopiformes