Subclass †Heterostraci Lankester, 1868 Family †Cyathaspididae Kiaer, 1932, nom. praeval. Subfamily †Tolypelepidinae Strand, 1934 (1932), nom. praeval. [paraphyletic] Genus †Tolypelepis Pander, 1856, sedis mutabilis 1 †Tolypelepis undulata