Plagioeciidae Canu, 1918
Plagioecia ambigua Osburn, 1953
Plagioecia anacapensis Osburn, 1953
Plagioecia bicolor (MacGillivray, 1885)
Plagioecia dispar Canu & Bassler, 1928
Plagioecia dorsalis (Waters, 1879)
Plagioecia gemelligera (Borg, 1944)
Plagioecia grimaldii
Plagioecia inoedificata (Jullien, 1882)
Plagioecia lactea Calvet, 1903
Plagioecia meandrina (Canu & Bassler, 1930)
Plagioecia parva Gordon & Taylor, 2010
Plagioecia patina (Lamarck, 1816)
Plagioecia platydiscus Harmelin, 1976
Plagioecia reticuloides Canu & Bassler, 1929
Plagioecia sarniensis (Norman, 1864)
Plagioecia striatula (Canu & Bassler, 1930)
Plagioecia subpapyracea (Canu & Bassler, 1930)
Plagioecia taylori
Plagioecia tortuosa Osburn, 1953
Plagioecia tubiabortiva (Canu & Bassler, 1930)
Plagioecia vancouverensis O'Donoghue & O'Donoghue, 1926
