Parascidia flemingi Alder & Hancock, 1912 – synonym of Sidnyum turbinatum
Parascidia forbesi Alder & Hancock, 1912 – synonym of Sidnyum turbinatum
Parascidium crispum Huitfeldt-Kaas, 1896 – synonym of Sidnyum turbinatum
Pelonaia corrugata Forbes & Goodsir, 1841 – synonym of Pelonaia corrugata
Pelonaia glabra Alder & Hancock, 1907 – synonym of Pelonaia corrugata
Pelonaia villosa Sars, 1859 – synonym of Pelonaia corrugata
Phallusia obliqua Hartmeyer, 1912 – synonym of Ascidia obliqua
Phallusiodes obliqua Huntsman, 1912 – synonym of Ascidia obliqua
Polycarpa libera Ärnbäck, Christie & Linde, 1922 – synonym of Polycarpa fibrosa
Polycarpa libera Kiaer, 1893 – synonym of Polycarpa fibrosa
Polyclinopsis haeckeli Gottschaldt, 1894 – synonym of Synoicum pulmonaria
Polyclinum aurantium Milne-Edwards, 1841 – synonym of Polyclinum aurantium
Polyclinum cerebriforme Alder & Hancock, 1912 – synonym of Polyclinum aurantium
Polyclinum sabulosum Giard, 1872 – synonym of Polyclinum aurantium
Polyclinum succineum Alder & Hancock, 1912 – synonym of Sidnyum turbinatum