Phylum Chordata Bateson, 1885 - chordates
   Subphylum Vertebrata Cuvier, 1812 - vertebrates
     Pisces
       Class Actinopterygii Woodward, 1891 - ray-finned fishes
         Order Scorpaeniformes Bloch, 1789 - mail-cheeked fishes
           Family Agonidae Swainson, 1839 - poachers
           Family Anoplopomatidae - sablefishes and skilfishes
           Family Aploactinidae - velvetfishes
           Family Bathylutichthyidae
           Family Bembridae - deepwater flatheads
           Family Caracanthidae - coral crouchers
           Family Comephoridae - Baikal oilfishes
           Family Congiopodidae - horsefishes
           Family Cottidae Bonaparte, 1832 - sculpins
           Family Cottocomephoridae see Family Cottidae Bonaparte, 1832
           Family Cyclopteridae
           Family Dactylopteridae - helmet gurnards
           Family Ereuniidae
           Family Gnathanacanthidae - red velvetfishes
           Family Hexagrammidae
           Family Hoplichthyidae - spiny flatheads
           Family Normanichthyidae
           Family Pataecidae - prowfishes
           Family Platycephalidae - flatheads
           Family Psychrolutidae - fatheads
           Family Scorpaenidae Jordan & Evermann, 1898 - scorpionfishes
           Family Triglidae Rafinesque, 1815 - searobins