Cyrtodonta expansa (FOSSIL) (Portlock) †
Heikea extumida (FOSSIL) Isberg, 1934 †
Heikea fallax (FOSSIL) Isberg, 1934 †
Heikea filberta (FOSSIL) Isberg, 1934 †
Heikea fragilis (FOSSIL) Isberg, 1934 †
Cyrtodonta gibbera (FOSSIL) (Ulrich, 1894 †)
Cyrtodonta glabella (FOSSIL) Ulrich, 1894 †
Heikea glabra (FOSSIL) Isberg, 1934 †
Heikea globosa (FOSSIL) Isberg, 1934 †
Cyrtodontula goniumbonata (FOSSIL) (Foerste, 1914 †)
Ortonella gorensis (FOSSIL) Foerste, 1924 †
Cyrtodonta grandis (FOSSIL) (Ulrich, 1890 †)
Cyrtodontula hadzeli (FOSSIL) Pojeta& Gilbert-Tomlinson, 1977 †
Ortonella hainesi (FOSSIL) (Miller, 1874 †)
Cyrtodonta halli (FOSSIL) (Nettleroth †)
Vanuxemia hayniana (FOSSIL) Safford †
Cyrtodonta hazeli (FOSSIL) Pojeta& Gilbert-Tomlinson, 1977 †
Cyrtodontula hindi (FOSSIL) (Billings, 1865 †)
Cyrtodonta holmi (FOSSIL) Isberg, 1934 †
Cyrtodontula huguesensis (FOSSIL) (Foerste, 1924 †)
Cyrtodontula impressata (FOSSIL) (C.C. Stewart, 1920 †)
Vanuxemia inconstans (FOSSIL) Billings, 1858 †
Warburgia iniqua (FOSSIL) Isberg, 1934 †
Heikea insolita (FOSSIL) Isberg, 1934 †
Cyrtodontula inutilis (FOSSIL) (Reed, 1905 †)
Cyrtodonta janesvillensis (FOSSIL) Ulrich, 1894 †
Cyrtodonta kagawongensis (FOSSIL) Foerste, 1924 †
Vanuxemia kagawongensis (FOSSIL) Foerste, 1924 †
Cyrtodonta kallholniensis (FOSSIL) Isberg, 1934 †
Cyrtodonta kayseri (FOSSIL) Frech, 1891 †
Ptychodesma knappianum (FOSSIL) J.W. Hall& R.P. Whitfield, 1872 †
Cyrtodonta lamellosa (FOSSIL) Hudson, 1903 †
Cyrtodontula lata (FOSSIL) (C.C. Stewart, 1920 †)
Heikea lata (FOSSIL) Isberg, 1934 †
Warburgia lata (FOSSIL) Isberg, 1934 †