<==o †Ischnacanthiformes Berg, 1940 |?- †Acanthospina irregulare Valiukevičius, 2003, E.Dev. NEEu. |?- †Granulacanthus joenelsoni Hanke, Wilson & Lindoe, 2001 |?- †Onchus graptolitarum Fritsch, 1907 [Leptocheles] E.Sil. EEu. |?-o †Acritolepidae Valiukevicius & Burrow, 2005 | |--o †Acritolepis Valiukevicius, 2003 | | |-- †A. ushakovi Valiukevicius, 2003 | | `-- †A. urvantsevi Valiukevicius, 2003 | |-- †Monospina erecta Valiukevicius, 2003 | |?- †Nerepisacanthus denisoni Burrow, 2011 | `--o †Pechoralepis Valiukevicius & Burrow, 2005 [Nostolepis Pander, 1856 in partim] | |-- †P. adzvensis (Valiukevicius, 2003) [†Nostolepis adzvensis Valiukevicius, 2003] | |-- †P. valentinae (Valiukevicius, 2003) [†Nostolepis valentinae Valiukevicius, 2003] | `-- †P. zinaidae (Valiukevicius, 2003) [†Nostolepis zinaidae Valiukevicius, 2003] [type] |--o †Poracanthodidae Vergoossen, 1999 | |?- †Zemlyacanthus menneri (Valiukevicius, 1992) | |--o †Poracanthodes Brotzen, 1934 [jr. synon. of Gomphonchus?? (Carroll, 1988)] | | |-- †P. punctatus Brotzen, 1934 | | |-- †P. stonehousensis | | |--+-- †P. subporosus Valiukevičius, 1998 | | | `?- †P. sp. cf. P. subporosus Valiukevičius, 1998 | | `-- †P. menneri Valiukevičius, 1992 [= Zemlyacanthus menneri (Valiukevicius, 1992)] | |--o †Radioporacanthodes Vergoossen, 1999; L. Dev. NEu. Aust. | | |-- †R. porosus (Brotzen, 1934) [Poracanthodes porosus Brotzen, 1934] | | `?- †R. sp. cf. R. porosus (Brotzen, 1934) [†Poracanthodes sp. cf. Poracanthodes porosus Brotzen, 1934 sensu Valiukevičius, 2003] | |--o †Gomphonchoporus Vergoossen, 1999; L. Sil. E. Dev. NEu. Aust. | | `-- †G. hoppei (Gross, 1947) [Gomphodus hoppei Gross, 1947] | `?-o †Trundlelepis Burrow, 1997 | |-- †T. cervicostulata Burrow, 1997 | `-- †T. sp. [Burrow, 2003] E.Dev. Aust. `--o †Ischnacanthidae Woodward, 1891 |--o †Acanthodopsis Penn. Eu. | `-- †A. wardi |-- †Acanthopora transitans Valiukevičius, 2003 |--o †Apateacanthus U. Dev. NA. [probably a chondrichthyan fin spine (Burrow, 2004)] | `-- †A. vetustus (Clarke, 1885) |-- †Arcticacanthus bicostatus Valiukevičius, 2003 |-- †Arenaceacanthus arcuatacanalis Valiukevičius, 2004; L.Sil. EEu. |--o †Atopacanthus Hussakof & Bryant, 1918; U. Dev. NA. Eu. EEu. | |-- †A. peculiaris (Hussakof, 1913) [Apateacanthus peculiaris Hussakof, 1913] | |-- †A. dentatus Hussakof & Bryant, 1918 | |-- †A. sp. [Ørvik, 1957] | |-- †A. sp. [Ørvik, 1960] | |-- †A. sp. [Novitskaya & Obruchev, 1967] | |-- †A. sp. [Jessen, 1973] | `?- †A.? ambrockensis |?- †Bracteatacanthus assiduus Valiukevičius, 2004; L.Sil. EEu. |-- †Bryantonchus peracutus (Bryant, 1934) Burrow, 2007; L.Dev. WNAm. |-- †Cacheacanthus utahensis Burrow, 2007; L.Dev. WNAm. |?- †Doliodus ?M.Dev. NA. [is a basal elasmobranchian chondrichthyan (Miller, Cloutier & Turner, 2003)] |-- †Erymnacanthus clivus Blais, Hermus & Wilson, 2015 [Ischnacanthus gracilis (Egerton); Bernascek & Dineley, 1977 (in partem)] E.Dev. WNAm. |-- †Euryacanthus rugosus Blais, Hermus & Wilson, 2015 [Ischnacanthus gracilis (Egerton); Bernascek & Dineley, 1977 (in partem)] E.Dev. WNAm. |-- †Grenfellacanthus zerinae Long, Burrow & Richie, 2004 |--o †Gomphonchus Gross, 1971 [Gomphodus; Poracanthodes] L.Sil. Eu. EEu. Aust. E.Dev. NA. Spits. Gr. ?SAs. | |?- †G.? bogongensis Burrow, 1997 | |?- †G.? minutus | |?- †G.? turnerae Burrow & Simpson, 1995 | |-- †G. hoppei | |-- †G. mediocostatus | |-- †G. sandelensis (Pander, 1856) | `-- †G. nordicus Valiukevičius, 2003 |--o †Helenacanthus E.Dev. NA. | `-- †H. incurvus |--o †Ischnacanthus Powrie, 1864 E.Dev. Eu. NA. | |-- †I. kingi | |-- †I. wickhami | `-- †I. gracilis (Egerton, 1861) |--o †Machaeracanthus Newberry, 1857 [Dinacanthodes] E.-M.Dev. Eu. L.Dev. NAf. E.-M.Dev. NA. | `-- †M. kayseri |--o †Marsdenius Wellburn, 1902; Miss. Eu. | |-- †M. acuta Wellburn, 1902 | `-- †M. summiti Wellburn, 1902 |--o †Persacanthus Janvier, 1977; E.Dev. SWAs. | |-- †P. kermanensis Janvier, 1977 | `-- †P. simpsonensis Reed, 1986 |?- †Plectrodus mirabilis L.Sil. Eu. |?-o †Podoliacanthus Voichyshyn & Szaniawski, 2012; E.Dev. EEu. | |-- †P. zychi Voichyshyn & Szaniawski, 2012 | |?- †P. sp. 1 [Voichyshyn & Szaniawski, 2012] | `?- †P. sp. 2 [Voichyshyn & Szaniawski, 2012] |-- †Rockycampacanthus milesi Long, 1986; E.Dev. Aust. |-- †Rohonilepis breviornatus Valiukevičius, 2004; L.Sil. EEu. |--o †Taemasacanthus Long, 1986 [incl.? Cambaracanthus Lindley, 2000; Cavanacanthus Lindley, 2000]; E.Dev. Aust. | |-- †T. porca Lindley, 2000 | |-- †T. narrengullenensis Lindley, 2002 | |-- †T. cooradigbeensis Lindley, 2002 | |-- †T. erroli Long, 1986 | |?- †Cambaracanthus goodhopensis Lindley, 2000; E.Dev Aust. | `?- †Cavanacanthus warrooensis Lindley, 2000; E.Dev Aust. |--o †Tricuspiacanthus Blais, Hermus & Wilson, 2015 [Ischnacanthus Powrie; Bernascek & Dineley, 1977 (in partem)] E.Dev. WNAm. | |-- †T. gannitus Blais, Hermus & Wilson, 2015 [Ischnacanthus gracilis (Egerton); Bernascek & Dineley, 1977 (in partem)] | `-- †T. pisciculus Blais, Hermus & Wilson, 2015 [Ischnacanthus gracilis (Egerton); Bernascek & Dineley, 1977 (in partem)] |--o †Uraniacanthus Miles, 1973; E.Dev. Eu. | `-- †U. spinosus `--o †Xylacanthus Ørvig, 1967; L.Sil. NWNA. E.Dev. Spits. |-- †X. kenstewarti Hanke, Wilson & Lindoe, 2001 |-- †X. minutus Gagnier & Goujet, 1997 `-- †X. grandis Ørvig, 1967
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