Plea Leach, 1817: 11. Type species by monotypy: Plea minutissima Leach, 1817.
Ploa Stephens, 1829b: 66; 1829a: 354. Incorrect subsequent spelling.
Ploa Burmeister, 1835: 189. Unjustified emendation.
Ploea Douglas & Scott, 1876: 61. Unjustified emendation.