After Carroll, 1988, and Nelson, 1994, with Recent species from Froese & Pauly, 2001 [“The Fishbase”]

<==o Trachichthyidae [Trachyichthyidae, lapsus calami?] [8/41]
   |--o †Acrogaster [Acanthophoria] U. Cret. Eu. SWAs. NAf.
   |  `-- †A. heckeli
   |-- †Antarctiberyx
   |--o Aulotrachichthys [3]
   |  |-- A. latus (Fowler, 1938)
   |  |-- A. novaezelandicus (Kotlyar, 1980)
   |  `-- A. pulsator Gomon & Kuiter, 1987
   |?- †Berycomorus firdoussi
   |--o Gephyroberyx Olig. EEu. R. Oc. [1 Recent species]
   |  |-- †G. robustus
   |  |?- C. orbiculatus
   |  `-- G. darwinii (Johnson, 1866) (Darwin's slimehead)
   |-- †Gnathoberyx U. Cret. SWAs. 
   |--o †Hoplopteryx [Goniolepis, Hemicyclolepis, Hemigonolepis, ?Priconolepis,] U. Cret. Eu. SWAs. NAf. NA.
   |  `-- †H. antiquus
   |-- Hoplostethus [Korsogaster, Leiogaster] Plioc. Eu. R. Oc. [26]
   |--o †Libanoberyx U. Cret. SWAs. 
   |  `-- †L. spinosus
   |--o †Lissoberyx U. Cret. SWAs.
   |  `-- †L. arambourgi
   |-- Optivus elongatus (Günther, 1859) (Slender roughy)
   |--o Paratrachichthys [7]
   |  |-- P. argyrophanus Woods, 1961
   |  |-- P. atlanticus Menezes, 1971
   |  |-- P. fernandezianus (Günther, 1887)
   |  |-- P. heptalepis Gon, 1984
   |  |-- P. prosthemius Jordan & Fowler, 1902
   |  |-- P. sajademalensis Kotlyar, 1979
   |  `-- P. trailli (Hutton, 1875) (Sandpaper fish)
   |-- Parinoberyx horridus Kotlyar, 1984
   |-- Sorosichthys ananassa Whitley, 1945 (Little pineapple fish)
   |?-o †Stichopteryx
   |  `-- †S. lewisi
   |-- Trachichthys australis Shaw & Nodder, 1799 (Roughy)
   |-- †Trachichthodes Tert. Aus. 
   `--o †Tubantia U. Cret. Eu.
      `-- †T. cataphractus

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