<==o Diplacanthida Berg, 1940 [Diplacanthiformes Berg, 1940] |?- †Uraniacanthus spinosus |--o †Culmacanthidae | `--o †Culmacanthus Long, 1983 | |-- †C. pambulensis Young, 1989b | `-- †C. stewarti |--o †Tetanopsyridae | `--o †Tetanopsyrus Gagnier et al., 1999; L. Dev. NNA. | |-- †T. lindoei Gagnier et al., 1999 | `-- †T. breviacanthis Hanke, Davis & Wilson, 2001 `--o †Diplacanthidae Woodward, 1891 |--o †Diplacanthus Agassiz, 1844 [Rhadinacanthus] M. Dev. Eu. EEu. U. Dev. NA. | |-- †D. longispinus Agassiz, 1844 | |-- †D. crassissimus Duff, 1842 | |-- †D. tenuistriatus | |-- †D. ellsi | |-- †D. horridus Woodward, 1892 | |-- †D. striatus | |-- †D. carinatus Gross, 1973 | |-- †D. kleesmentae Valiukevičius, 1986 | |-- †D. gravis Valiukevičius, 1988 | |-- †D. poltnigi Valiukevičius, 2003 | `-- †D. solidus Valiukevičius, 2003 |--o †Gladiobranchus Bernacsek & Dineley, 1977; L. Dev. NNA. | `-- †G. probaton |--o †Ptychodictyon Gross, 1973; L.Dev. WNAm., M.Dev. EEu. | |-- †P. rimosum Gross, 1973 | |-- †P. sulcatum Gross, 1973 | |-- †P. distinctum Valiukevičius, 1979 | |-- †P. ancestralis Valiukevičius, in Valiukevičius & Karatajute-Talimaa, 1986 | `-- †P. americanum Burrow, 2007 `--o †Rhadinacanthus Traquair, 1888 `-- †R. longispinatus
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