After Harold & Weitzman, 1996

<==o Sternoptychidae (lättäkalat)
   |?- †Polyipnoides Eoc. Eu.
   |-- Thorophos [Neophos]
   `--+-- Araiophos
      `--+--+--o Maurolicus [13]
         |  |  |-- M. australis Hector, 1875
         |  |  |-- M. breviculus Parin & Kobyliansky, 1993
         |  |  |-- M. imperatorius Parin & Kobyliansky, 1993
         |  |  |-- M. inventionis Parin & Kobyliansky, 1993
         |  |  |-- M. javanicus Parin & Kobyliansky, 1993
         |  |  |-- M. kornilovorum Parin & Kobyliansky, 1993
         |  |  |-- M. mucronatus Klunzinger, 1871
         |  |  |-- M. Mülleri (Gmelin, 1789) (Pearlsides)
         |  |  |-- M. parvipinnis Vaillant, 1888
         |  |  |-- M. rudjakovi Parin & Kobyliansky, 1993
         |  |  |-- M. stehmanni Parin & Kobyliansky, 1996
         |  |  |-- M. walvisensis Parin & Kobyliansky, 1993
         |  |  `-- M. weitzmani Parin & Kobyliansky, 1993
         |  `--+-- Danaphos oculatus (Garman, 1899) (Bottlelights)
         |     `--o Vallenciennellus [2]
         |        |-- V. carlsbergi Bruun, 1931
         |        `-- V. tripunctulatus (Esmark, 1871) (Constellationfish)
         `--+--+-- Sonoda megalophthalma Grey, 1959
            |  `--o Argyripnus [5]
            |     |-- A. atlanticus Maul, 1952
            |     |-- A. brocki Struhsaker, 1973 (Brock's bristle-mouth fish)
            |     |-- A. electronus Parin, 1992
            |     |-- A. ephippiatus Gilbert & Cramer, 1897 (Gilbert & Cramer's bristle-mouth fish)
            |     `-- A. iridescens McCulloch, 1926
            `--o Sternoptychinae
               |-- Polyipnus Olig. Eu. R. Oc. [25]
               `--+--o Sternoptyx Olig. Eu. R. Oc. [4]
                  |  |-- S. diaphana Hermann, 1781 (Diaphanous hatchet fish)
                  |  |-- S. obscura Garman, 1899
                  |  |-- S. pseudobscura Baird, 1971 (Highlight hatchetfish)
                  |  `-- S. pseudodiaphana Borodulina, 1977
                  `--o Argyropelecus Olig. Mioc. Eu. Mioc. NAf. NA. R. Oc. [7]
                     |-- A. aculeatus Valenciennes, 1850 (Lovely hatchetfish)
                     |-- A. affinis Garman, 1899 (Pacific hatchet fish)
                     |-- A. gigas Norman, 1930 (Hatchetfish)
                     |-- A. hemigymnus Cocco, 1829 (helmikala; Half-naked hatchetfish)
                     |-- A. lychnus Garman, 1899 (Tropical hatchetfish)
                     |-- A. olfersi (Cuvier, 1829)
                     `-- A. sladeni Regan, 1908 (Sladen's hatchet fish)

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