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

<==o Ophidiiformes (partanilkkakalat)
   |--o Ophidioidei
   |  |-- Carapidae [Carapodidae; Fierasferidae] (pearlfishes; neulakalat) [FB: 7/31]
   |  `-- Ophidiidae [Brotulidae] (partanilkat; cusk-eels) [FB: 50/242]
   `--o Bythitoidei
      |-- Bythitidae (Viviparous brotulas)[FB: 33/96]
      |-- Aphyonidae [FB: 6/22]
      `?-o Parabrotulidae (false brotulas) [2/3] [problematic, possibly related to zoarcids (Nelson, 1994)]
         |-- Leucobrotula adipata Koefoed, 1952
         `--o Parabrotula [2]
            |-- P. plagiophthalma Zugmayer, 1911
            `-- P. tanseimaru Miya & Nielsen, 1991

Reference(s):