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

<==o Rhombosoleinae [N: 9/19] [FB: 9/17]
   |--o Ammotretis [3]
   |  |-- A. elongatus McCulloch, 1914 (Elongate flounder)
   |  |-- A. lituratus (Richardson, 1843) (Tudor's flounder)
   |  `-- A. rostratus Günther, 1862 (Longsnout flounder)
   |-- Azygopus pinnifasciatus Norman, 1926 (Banded-fin flounder)
   |--o Colistium [2]
   |  |-- C. guntheri (Hutton, 1873)
   |  `-- C. nudipinnis (Waite, 1911)
   |-- Oncopterus darwinii Steindachner, 1874 (Remo flounder)
   |-- Pelotretis flavilatus Waite, 1911 (Southern lemon sole)
   |--o Peltorhamphus [3]
   |  |-- P. latus James, 1972 (Speckled sole)
   |  |-- P. novaezeelandiae Günther, 1862 (New Zealand sole)
   |  `-- P. tenuis James, 1972
   |-- Psammodiscus ocellatus Günther, 1862 (Indonesian ocellated flounder)
   |--o Rhombosolea [4]
   |  |-- R. leporina Günther, 1862 (Yellowbelly flounder)
   |  |-- R. plebeia (Richardson, 1843) (New Zealand flounder)
   |  |-- R. retiaria Hutton, 1873 (Black flounder)
   |  `-- R. tapirina Günther, 1862 (Greenback flounder)
   `-- Taratretis derwentensis Last, 1978 (Derwent flounder)

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