• Platycardia Beringer, 1949 † [Family: Dicerocardiidae]
• Platycardia D.D. Pant & D.D. Nautiyal, 1960 † (uncertain) [Family: Plantae (awaiting allocation)]
• Platychorda B.G. Briggs & L.A.S. Johnson, 1998
• Platycoelia Dahlbom, 1845 accepted as Platycelia Dahlbom, 1845 accepted as Chrysis Linnaeus, 1761 [Family: Chrysididae]
• Platycoelia Dejean, 1833 [Family: Scarabaeidae]
• Platycoenia Vaughan, 1900 †
• Platycopia G.O. Sars, 1911
• Platycordulia Williamson, 1908 (uncertain)
• Platycoris Agassiz, 1846 (unaccepted) [Family: Hemiptera (awaiting allocation)]
• Platycoris Guérin, 1831 accepted as Diemenia Spinola, 1850 [Family: Pentatomidae]
• Platycoris Perty, 1833 [Family: Reduviidae]
• Platycornia Zoia, 2018
• Platygorgia Studer, 1887 accepted as Eunicella Verrill, 1869
• Platyhoria Bonadona, 1952 accepted as Microhoria Chevrolat, 1877
• Platyoria Bonadona, 1952 (uncertain)
• Platypodia Bell, 1835
• Playfordia Cook, Blodgett & Becker, 2003 † (uncertain) [Class: Gastropoda]
• Playfordia Glenister & Klapper, 1966 † [Class: Conodonta]