Alburnellus Girard, 1856 accepted as Notropis Rafinesque, 1818 (original description)
Avalana Meek & Hayden, 1856 † accepted as Avellana d'Orbigny, 1843 † (original description)
Brachysaurus Hallowell, 1856 (original description)
Centemodon Lea, 1856 (original description)
Ceratichthys Baird in Girard, 1856 accepted as Nocomis Girard, 1856 (original description)
Cimolichthys Leidy, 1857 † (original description)
Codoma Girard, 1856 (original description)
Compsacanthus Newberry, 1856 (original description)
Compsemys Leidy, 1857 † (original description)
Compsosaurus Leidy, 1857 † (original description)
Cylindracanthus Leidy, 1856 † (original description)
Cyprinella Girard, 1856 (original description)
Deinictis Leidy, 1856 † accepted as Dinictis Leidy, 1854 † (original description)
Deinodon Leidy, 1856 (original description)
Dictyocephalus Leidy, 1857 (original description)
Dionda Girard, 1856 (original description)
Eleutherocrinus Shumard & Yandell, 1856 † (original description)
Heredia Girard, 1856 (original description)
Hetaerodes Cassin, 1856 (original description)
Heteroglossa Hallowell, 1857 accepted as Dimorphognathus Boulenger, 1906 (original description)
Hudsonius Girard, 1856 accepted as Notropis Rafinesque, 1818 (original description)
Hyracodon Leidy, 1856 † (original description)
Ischyrhiza Leidy, 1856 † (original description)
Ischyromys Leidy, 1856 † (original description)
Ischyrotherium Leidy, 1857 (original description)
Lamprosoma Hallowell, 1856 accepted as Chionactis Cope, 1860 (original description)
Leptarctus Leidy, 1857 † (original description)
Leptauchenia Leidy, 1856 † (original description)
Leptochoerus Leidy, 1856 † (original description)
Macrophoca Leidy, 1856 (original description)
Mecolepis Newberry, 1857 (original description)
Meda Girard, 1856 (original description)
Melignothes Cassin, 1856 (original description)
Microps Hallowell, 1856 accepted as Tropidoclonion Cope, 1860 (original description)
Minomus Girard, 1856 accepted as Catostomus Lesueur, 1817 (original description)
Moniana Girard, 1856 accepted as Cyprinella Girard, 1856 (original description)
Mylognathus Leidy, 1856 (original description)
Mytelus Meek & Hayden, 1856 † accepted as Mytilus Linnaeus, 1758 (original description)
Nema Leidy, 1856 (original description)
Nocomis Girard, 1856 (original description)
Notophis Hallowell, 1856 (original description)
Omosaurus Leidy, 1857 † (original description)
Orthodon Girard, 1856 (original description)
Palaeolagus Leidy, 1856 † (original description)
Palaeoscincus Leidy, 1856 † (original description)
Phasidus Cassin, 1856 accepted as Agelastes Bonaparte, 1850 (original description)
Plagiodon Lea, 1856 (original description)
Pleocoma Leconte, 1856 (original description)
Pliogonodon Leidy, 1857 † (original description)
Polygonodon Leidy, 1856 † (original description)
Polymoechus Leconte, 1856 accepted as Parastasia Westwood, 1841 (original description)
Pompholyx Lea, 1856 (original description)
Potamonema Leidy, 1856 (original description)
Protomeryx Leidy, 1856 † (original description)
Protosphyraena Leidy, 1857 † (original description)
Richardsonius Girard, 1856 (original description)
Siboma Girard, 1856 accepted as Gila Baird & Girard, 1853 (original description)
Spironoura Leidy, 1856 (original description)
Tamiosoma Conrad, 1857 (original description)
Thespesius Leidy, 1856 † (original description)
Tiaroga Girard, 1856 accepted as Rhinichthys Agassiz, 1849 (original description)
Tigoma Girard, 1856 accepted as Gila Baird & Girard, 1853 (original description)
Trachodon Leidy, 1856 † (original description)
Trigonophrys Hallowell, 1856 (original description)
Troodon Leidy, 1856 † (original description)