Phylum Chordata - chordates
 Subphylum - Urochordata - tunicates 
 Subphylum - Cephalochordata - lancelets
 Subphylum - Vertebrata - vertebrates
  Superclass Agnatha - jawless fishes
   Class Myxini - hagfishes
    Order Myxiniformes - hagfishes
   Class Cephalaspidomorphi -
    Order Petromyzontiformes - lampreys
  Superclass Gnathostomata - jawed fishes
   Class Chondrichthyes - cartilaginous fishes
    Subclass Elasmobranchii - sharklike fishes
     Superorder Euselachii - modern sharks, skates & rays
      Order Heterodontiformes - bullhead & horn sharks
      Order Orectolobiformes - carpet, nurse, whale sharks & others
      Order Carchariniformes - requiem, hammerhead sharks & others
      Order Lamniformes - sand tiger, megamouth, thresher, basking, mackerel sharks & others
      Order Hexanchiformes - frill & cow sharks
      Order Squaliformes - bramble, sleeper & dogfish sharks
      Order Squatiniformes - angel sharks
      Order Pristiophoriformes - sawsharks
      Order Rajiformes - skates & rays
    Subclass Holocephali - chimaeras
     Superorder Holocephalomorpha - chimaeras
      Order Chimaeriformes - chimaeras 
  Grade Teleostomi - bony fishes
   Class Sarcopterygii - lobefinned fishes
    Subclass Coelacanthimorpha - coelacanths
    Subclass Dipnoi - lungfishes
   Class Actinopterygii - ray finned fishes
    Subclass Chondrostei - 
      Order Polypteriformes - bichirs & reedfish
      Order Acipenseriformes - sturgeons & paddlefish
    Subclass Neopterygii -
      Order Semionotiformes - gars
      Order Amiiformes - bowfin
     Division Teleostei - modern bony fishes
      Subdivision Osteoglossomorpha - bonytongues & relatives
        Order Osteoglossiformes - bonytongues, mooneyes, elephantfishes, & others
      Subdivision Elopomorpha - tarpons, ladyfishes, bonefish, & relatives
        Order Elopiformes - tarpons & ladyfishes
        Order Albuliformes - bonefishes & relatives 
        Order Anguilliformes - eels
        Order Saccopharyngiformes - swallowers, gulpers & relatives 
      Subdivision Clupeomorpha - 
        Order Clupeiformes - herrings, shads, & anchovies
      Subdivision Euteleostei - "true" teleosts
       Superorder Ostariophysi
        Series Anotophysi
         Order Gonorhynchiformes - milkfish & relatives
        Series Otophysi 
         Order Cypriniformes - minnows, suckers, loaches, & relatives
         Order Characiformes - characins & relatives
         Order Siluriformes - catfishes
         Order Gymnotiformes - knifefishes
       Superorder Protacanthopterygii - 
         Order Esociformes - pikes, mudminnows & relatives
         Order Osmeriformes - smelts & relatives
            Order Salmoniformes - trouts, salmons, whitefish, & relatives
       Superorder Stenoptergii -
         Order Stomiiformes - bristlemouths, lightfishes, & relatives
         Order Ateleopodiformes - jellynose fishes
       Superorder Cyclosquamata -
         Order Aulopiformes - lizardfishes & relatives
       Superorder Scopelomorpha -
         Order Mytophiformes - lanternfishes
       Superorder Lampridiomorpha -
         Order Lampridiformes - opahs, ribbonfishes, oarfishes & relatives
       Superorder Polymixiomorpha
         Order Polymixiiformes - beardfishes
       Superorder Paracanthopterygii
         Order Percopsiformes - pirate perch, troutperches, cavefishes
         Order Ophidiiformes - pearlfishes, cuskeels, brotulas & relatives
         Order Gadiformes - cods, hakes, grenadiers, & relatives
         Order Batrachoidiformes - toadfishes, midshipmen
         Order Lophiiformes - frogfishes, goosefishes, batfishes, anglerfishes & relatives
       Superorder Acanthopterygii - spiny finned fishes
        Series Mugilomopha
         Order Mugiliformes - mullets
        Series Atherinomorpha
         Order Atheriniformes - silversides, rainbowfishes, & relatives
         Order Beloniformes - needlefishes, halfbeaks, flyingfishes, & relatives
         Order Cyprinodontiformes - killifishes, topminnows, livebearers, pupfish & relatives
        Series Percomorpha - perch-like fishes
         Order Stephanoberyciformes - whalefishes & relatives
         Order Beryciformes - flashlight fishes, roughies, squirrel fishes & relatives
         Order Zeiformes - dories & relatives
         Order Gasterosteiformes - sticklebacks, seahorses, pipefishes, snipefishes & relatives
         Order Synbranchiformes - swamp eels, spiny eels
         Order Scorpaeniformes - scorpionfishes, rockfishes, searobins, flatheads, sculpins & rel.
         Order Perciformes - perches, basses, sunfishes, jacks, snooks, bluefishes,
            remoras, cobia, mojarras, grunts, threadfins, croakers, drums, seatrouts, 
            butterflyfishes, angelfishes, pigmy sunfishes, cichlids, damselfishes, 
            wrasses, parrotfishes, duckbills, stargazers, 
            blennies, clingfishes, gobies, sleepers, spadefishes, surgeonfishes,
            cutlassfishes, mackerels, tunas, swordfish, billfishes, butterfishes, 
            gouramis, snakeheads
         Order Pleuronectiformes - flounders, soles, tonguefishes, 
         Order Tetraodontiformes - triggerfishes, filefishes, boxfishes,
            puffers, burrfishes, ocean sunfishes