After Whittington, Chang, Dean, Fortey, Jell, Laurie, Palmer, Repina, Rushton & Shergold, 1997

<==o †Diplagnostidae Whitehouse, 1936
   |--o †Diplagostinae Whitehouse, 1936
   |  |--o †Diplagnostus Jaekel, 1909 [Enetagnostus Whitehouse, 1936]; M. Camb. SA. NENA. NEu. WEu. CAs. EAs. Aust.
   |  |  |-- †D. planicauda (Angelin, 1851) [Agnostus planicauda Angelin, 1851]
   |  |  `-- †D. humilis (Whitehouse, 1936) [Enetagnostus humilis Whitehouse, 1936]
   |  |--o †Acadagnostus Kobayashi, 1939a [Axagnostus Laurie, 1990]; M. Camb. NA. NEu. SWAs. CAs. EAs. Aust.
   |  |  |-- †A. acadius (Hartt, in Dawson, 1868) [Agnostus acadius Hartt, in Dawson, 1868]
   |  |  `-- †A. fallax (Linnarsson, 1869) [Agnostus fallax Linnarsson, 1869; Axagnostus fallax (Linnarsson, 1869) Laurie, 1990]
   |  |--o †Baltagnostus Lochman, in Lochman & Duncan, 1944
   |  |  `-- †B. centerensis (Resser, 1938) [Proagnostus? centerensis Resser, 1938]; M. Camb. NA. EAs. Aust.
   |  |--o †Dolichagnostus Pokrovskaya, 1958
   |  |  `-- †D. admirabilis Pokrovskaya, 1958
   |  |?-o ?†Iniosphenicus Öpik, 1979
   |  |  `-- †I. talis Öpik, 1979
   |  |--o †Linguagnostus Kobayashi, 1939
   |  |  `-- †L. kjerulfi (Brögger, 1878) [Agnostus kjerulfi Brögger, 1878]
   |  |--o †Oedorhacis Resser, 1938
   |  |  `-- †O. typicalis Resser, 1938
   |  `--o †Tasagnostus Jago, 1976
   |     `-- †T. debori Jago, 1976
   |--o †Oidalagostinae Öpik, 1967
   |  |--o †Oidalagnostus Westergård, 1946 [Ovalagnostus Lu in Lu, Zhu et al., 1974]
   |  |  |-- †O. changi Lu in Wang, 1964 [Ovalagnostus changi (Lu, 1964)]
   |  |  `-- †O. trispinifer Westergård, 1946
   |  `--o †Cristagnostus Rushton, 1978
   |     `-- †C. papilio Rushton, 1978
   `--o †Pseudagnostinae Whitehouse, 1936
      |--o †Pseudagnostus Jaekel, 1909
      |  |--o †(Pseudagnostus) Jaekel, 1909
      |  |  `-- †P. (P.) cyclopyge (Tullberg, 1880) [Agnostus cyclopyge Tullberg, 1880]
      |  |--o †(Pseudagnotina) Palmer, 1962a
      |  |  `-- †P. (P.) contracta (Palmer, 1962a) [Pseudagnostina contracta Palmer, 1962a]
      |  `--o †(Sulcatagnostus) Kobayashi, 1937
      |     `-- †P. (S.) securiger (Lake, 1906) [Agnostus securiter Lake, 1906]
      |--o †Agnostotes Öpik, 1963
      |  |--o †(Agnostotes) Öpik, 1963
      |  |  `-- †A. (A.) inconstans Öpik, 1963
      |  `--o †(Pseudoglyptagnostus) Lu, in Wang, 1964 [Glyptagnostotes Lazarenko, 1966]
      |     |-- †A. (P.) clavatus (Lu, 1964) [Pseudoglyptagnostus clavatus Lu, 1964]
      |     `-- †A. (P.) elegans (Lazarenko, 1966) [Glyptagnostotes elegans Lazarenko, 1966]
      |--o †Denagnostus Jago, 1987
      |  `-- †D. corbetti Jago, 1987
      |--o †Litagnostus Rasetti, 1944
      |  `-- †L. levisensis Rasetti, 1944
      |--o †Nahannagnostus Pratt, 1992
      |  `-- †N. nganasanicus (Rozova, 1964) [Pseudagnostus nganasanicus]
      |--o †Neoagnostus Kobayashi, 1955
      |  |--o †(Neoagnostus) Kobayashi, 1955 [Pseudorhaptagnostus Lermontova, 1940; Euplethagnostus Lermontova, 1940; Hyperagnostus Kobayashi, 1955; Tarayagnostus Suarez-Socuco, 1975; Calagnostus Zhang & Wang, 1985]
      |  |  |-- †N. (N.) aspidoides Kobayashi, 1955
      |  |  |-- †N. (N.) simplex (Lermontova, 1940) [Pseudorhaptagnostus simplex Lermontova, 1940]
      |  |  |-- †N. (N.) subangulatus (Lermontova, 1940) [Euplethagnostus subangulatus Lermontova, 1940]
      |  |  |-- †N. (N.) binodosus (Kobayashi, 1955) [Hyperagnostus binodosus Kobayashi, 1955]
      |  |  |-- †N. (N.) corrugatus (Suarez-Socuco, 1975) [Tarayagnostus corrugatus Suarez-Socuco, 1975]
      |  |  `-- †N. (N.) magezhuangensis (Zhang & Wang, 1985) [Calagnostus magezhuangensis Zhang & Wang, 1985]
      |  `--o †(Machairagnostus) Harrington & Leanza, 1957
      |     `-- †N. (M.) tmetus Harrington & Leanza, 1957
      |--o †Oxyagnostus Öpik, 1967
      |  `-- †O. apicula Öpik, 1967
      |--o †Rhaptagnostus Whitehouse, 1936
      |  |-- †R. cyclopygeformis (Y. Sun, 1924) [Agnostus cyclopygeformis Y. Sun, 1924]
      |  |-- †R. convergens (Palmer)
      |  |--o †R. clarki
      |  |  `-- †R. c. maximus
      |  |-- †R. papilio
      |  `-- †R. bifax
      |--o †Trisulcagnostus Ergaliev, 1980
      |  `-- †T. trisulcus Ergaliev, 1980
      `--o †Xestagostus Öpik, 1967
         `-- †X. legirupa Öpik, 1967

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