Paracyathus pteropus Gosse, 1860 – synonym of Caryophyllia smithii
Paracyathus taxilianus Gosse, 1860 – synonym of Caryophyllia smithii
Paracyathus thulensis Gosse, 1860 – synonym of Caryophyllia smithii
Parazoanthus dixoni Haddon & Shackleton, 1891 – synonym of Parazoanthus anguicomus
Parazoanthus haddoni Carlgren, 1913 – synonym of Parazoanthus anguicomus
Parazoanthus sulcatus Teissier, 1965 – synonym of Isozoanthus sulcatus
Pavonaria christii Alder, 1863 – synonym of Balticina christii
Pavonaria quadrangularis Johnston, 1847 – synonym of Funiculina quadrangularis
Peachia hastata Gosse, 1855 – synonym of Peachia cylindrica
Peachia triphylla Gosse, 1860 – synonym of Peachia cylindrica
Peachia undata Gosse, 1858 – synonym of Peachia cylindrica
Pennatula mirabilis O.F. Muller, 1776 – synonym of Virgularia mirabilis
Pennatula quadrangularis Pallas, 1766 – synonym of Funiculina quadrangularis
Phellia murocincta Gosse, 1860 – synonym of Sagartia troglodytes
Phellia picta Gosse, 1860 – synonym of Sagartiogeton laceratus
Priapus equinus Linnaeus, 1758 – synonym of Actinia equina
Priapus felinus Linnaeus, 1761 – synonym of Urticina felina
Priapus senilis Linnaeus, 1761 – synonym of Metridium senile
Priapus viridis Forskal, 1775 – synonym of Anemonia viridis