After Carroll, 1988, Frickhinger, 1995, and Poplin, 1999

<==o †Elonichthyidae Aldinger 1937
   |-- †Mansfieldiscus sweeti Woodward, 1906
   |--o †Drydenius Miss. Perm. Eu.
   |  `-- †D. insignis
   |--o †Gonatodus Miss. NA. Miss. Penn. Eu.
   |  `-- †G. punctatus [=? Elonichthys punctatus]
   `--o †Elonichthys Giebel, 1848 [Ganacrodus, ?Pariostegus, ?Propalaeoniscus] Miss. U. Perm. Eu. Miss. Penn. ?U. Trias. NA. Miss. U. Perm. ? U. Trias. Aus. L. Perm. SAf. M. Perm. Gr. U. Perm. SA. ?Trias. WAf.
      |-- †E. aitkeni Traquair, 1886
      |-- †E. bucklandi (Agassiz, 1835) [Pygopterus bucklandi]
      |-- †E. disjunctus Eastman, 1903
      |-- †E. egertoni Egerton, 1850 [Palaeoniscus egertoni]
      |-- †E. germari Giebel, 1848
      |-- †E. gigas Fritsch, 1877
      |-- †E. macropterus (Bronn, 1829) [Palaeoniscum macropterum]
      |-- †E. peltigerus Newberry, 1856
      |-- †E. perpennatus Eastman, 1902
      |-- †E. portlocki (Egerton, 1850) [Amblypterus portlocki]
      |-- †E. pulcherrimus Traquair, 1881
      |-- †E. punctatus Aldinger, 1937
      |-- †E. robisoni (Hibbert, 1835) [Palaeoniscus robisoni]
      |-- †E. semistriatus Traquair, 1877
      |-- †E. serratus Traquair, 1881
      |-- †E. striatus (Agassiz, 1835) [Amblypterus striatus]
      `-- †E. whaitsi Broom, 1913

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