Sacrobotrylloides espevaerense Huitfeldt-Kaas, 1896 – synonym of Botrylloides leachi
Sidnyum turbinatum Savigny, 1816 – synonym of Sidnyum turbinatum
Styela cilindriformis Bonnevie, 1896 – synonym of Styela coriacea
Styela clava Herdman, 1882 – synonym of Styela clava
Styela comata Alder & Hancock, 1907 – synonym of Polycarpa fibrosa
Styela fibrillata Alder & Hancock, 1907 – synonym of Polycarpa fibrosa
Styela granulata Alder & Hancock, 1907 – synonym of Styela coriacea
Styela informis Alder & Hancock, 1907 – synonym of Polycarpa pomaria
Styela loveni Ärnbäck, Christie & Linde, 1922 – synonym of Styela coriacea
Styela lovenii (or loveni) Kiaer, 1893 – synonym of Styela coriacea
Styela mammiculata Carlisle, 1954 – synonym of Styela clava
Styela nidrosiensis Ärnbäck, 1926 – synonym of Styela coriacea
Styela northumbrica Alder & Hancock, 1907 – synonym of Styela coriacea
Styela opalina Alder & Hancock, 1907 – synonym of Polycarpa pomaria
Styela quadrangularis Alder & Hancock, 1907 – synonym of Polycarpa pomaria
Styela sulcatula Alder & Hancock, 1907 – synonym of Polycarpa pomaria
Styela tuberosa Alder & Hancock, 1907 – synonym of Polycarpa pomaria
Styela vestita Alder & Hancock, 1907 – synonym of Cnemidocarpa mollis
Styelopsis grossularia Alder & Hancock, 1907 – synonym of Dendrodoa grossularia
Styelopsis sphaerica Alder & Hancock, 1907 – synonym of Dendrodoa grossularia