After Hirayama, 1997, and Parham, 2005

Euclastes Cope, 1867
        †Osteopygis Cope, 1868
        †Lytopoma Cope, 1870(?)
        †CatapleuraPropleuraErquelinnesia Hay, 1908(?)

    †Euclastes platyops Cope, 1867

    †Euclastes wielandi (Hay, 1908)
        †Lytopoma wielandi Hay, 1908
        †Erquelinnesia molaria Hay, 1908
        †Osteopygis emarginatus Cope, 1868; Hirayama, 1997
        †Osteopygoides priscus Karl, Tichy & Ruschak, 1998
        †Osteopygis emarginatus Cope; Hirayama & Tong, 2003
        †Euclastes priscus (Karl, Tichy & Ruschak); Lynch & Parham, 2003

    †Euclastes gosseleti (Dollo, 1886)
        †Lytoloma gosseleti (Dollo); Hirayama, 1997
        †Euclastes gosseleti (Dollo); Lynch & Parham, 2003
        †Euclastes gosseleti (Dollo); Parham, 2005

    †Euclastes meridionalis (de la Fuente & Casadío, 2000)

    †Euclastes planimenta (Owen, 1842)
        †Lytoloma planimentum (Owen)
        †Erquelinnesia planimentum (Owen)
        †Euclastes planimenta (Owen); Lynch & Parham, 2003
        †Euclastes planimenta (Owen); Parham, 2005

    †Euclastes roundsi (Weems, 1988)

†Euclastes hutchisoni Lynch & Parham, 2003

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