• Placophora A. E. Verrill & S. Smith, 1882 accepted as Placiphorella Dall, 1879
• Placophora de Fromentel, 1879 † accepted as Agathelia Reuss, 1854 †
• Placophora accepted as Polyplacophora
• Placophora J.Agardh, 1863
• Placophora (Euplacophora) A. E. Verrill & S. Smith, 1882 accepted as Placiphorella Dall, 1879
• Placophora (Euplacophora) atlantica A. E. Verrill & S. Smith, 1882 accepted as Placiphorella atlantica (A. E. Verrill & S. Smith, 1882)
• Placophora binderi (J. Agardh) J. Agardh accepted as Placophora binderi (J.Agardh) J.Agardh, 1863
• Placophora binderi (J.Agardh) J.Agardh, 1863
• Placophora cucullata J.Agardh, 1892 accepted as Hypoglossum revolutum (Harvey) J.Agardh, 1898
• Placophora eckloniae M.A.Pocock ex Scagel, 1953 accepted as Placophora monocarpa (Montagne) Papenfuss, 1956
• Placophora japonica Tanaka, 1963
• Placophora latiuscula Okamura, 1895 accepted as Symphyocladia marchantioides (Harvey) Falkenberg, 1897
• Placophora linearis Okamura, 1895 accepted as Symphyocladia linearis (Okamura) Falkenberg, 1901
• Placophora monocarpa (Montagne) Papenfuss accepted as Placophora monocarpa (Montagne) Papenfuss, 1956
• Placophora monocarpa (Montagne) Papenfuss, 1956
• Placophora neocomiensis de Fromentel, 1870 †
• Placophora valentiensis Alloiteau, 1960 †