Atyoida Randall, 1840 (original description)
Blepharipoda Randall, 1840 (original description)
Cameroceras Conrad, 1842 † (original description)
Cypcelus Townsend, 1840 (original description)
Diploceras Conrad, 1842 (original description)
Distichurus Hallowell, 1842 (original description)
Hydnoceras Conrad, 1842 † (original description)
Icthyocrinus Conrad, 1842 † (original description)
Microdon Conrad, 1842 † accepted as Eodon Hall in Miller, 1877 † (original description)
Nucleocrinus Conrad, 1842 † (original description)
Orthostoma Randall, 1840 accepted as Poppiana Bott, 1969 (original description)
Pachygrapsus Randall, 1840 (original description)
Percina Haldeman, 1842 (original description)
Platyostoma Conrad, 1842 † (original description)
Plectostylus Conrad, 1842 (original description)
Stephanocrinus Conrad, 1842 † (original description)
Trapezium Randall, 1840 accepted as Trapezia Latreille, 1828 (original description)