• Dunstervillia corcyrensis Schmidt, 1862 accepted as Sycon humboldtii (Risso, 1826) accepted as Sycon humboldti Risso, 1827
• Dunstervillia elegans Bowerbank, 1845 accepted as Sycon elegans (Bowerbank, 1845)
• Dunstervillia formosa Haeckel, 1870 accepted as Sycon formosum (Haeckel, 1870)
• Dunstervillia lanzarotae Haeckel, 1870 accepted as Sycon elegans (Bowerbank, 1845)
• Dunstervillia schmidti Haeckel, 1870 accepted as Sycon humboldtii (Risso, 1826) accepted as Sycon humboldti Risso, 1827
• Homoderma sycandra Lendenfeld, 1895 accepted as Sycon sycandra (Lendenfeld, 1895)
• Leuckartea natalensis Miklucho-Maclay in Haeckel, 1872 accepted as Grantessa ramosa (Haeckel, 1872)
• Scypha acanthoxea Little, 1963 accepted as Sycon acanthoxea (Little, 1963)
• Scypha ananus (Montagu, 1818)
• Scypha arctica (Haeckel, 1872) accepted as Sycon arcticum (Haeckel, 1870)
• Scypha asconoides (Breitfuss, 1896) accepted as Sycetta asconoides Breitfuss, 1896
• Scypha barbadensis
• Scypha ciliata (Fabricius, 1780)
• Scypha coacta (Urban, 1905)
• Scypha compactum (Lambe, 1893)
• Scypha compressa (Fabricius, 1780) accepted as Grantia compressa (Fabricius, 1780)
• Scypha coronata (Ellis & Solander, 1786)
• Scypha crucifera (Polejaeff, 1883) accepted as Megapogon crucifer (Poléjaeff, 1883)
• Scypha egedii (Schmidt, 1870) accepted as Leucandra egedii (Schmidt, 1870)
• Scypha elegans (Bowerbank, 1845)
• Scypha fistulosa (Johnston, 1842)
• Scypha glacialis (Haeckel, 1872) accepted as Sycettusa glacialis (Haeckel, 1870)
• Scypha guadrangulata (Schmidt, 1868)
• Scypha kuekenthali (Breitfuss, 1896) accepted as Sycettusa kuekenthali (Breitfuss, 1896)
• Scypha labyrinthica (Carter, 1878)
• Scypha mundula (Lambe, 1893)
• Scypha nemurensis (Hozawa, 1929) accepted as Grantessa nemurensis Hozawa, 1929
• Scypha protecta (Lambe, 1896)
• Scypha quadrangulata (Schmidt, 1868) accepted as Sycon quadrangulatum (Schmidt, 1868)
• Scypha raphanus (Schmidt, 1862)
• Scypha scaldiensis Van Koolwijk, 1982 accepted as Sycon scaldiense (Van Koolwijk, 1982)
• Scypha setosa (Schmidt, 1862)
• Scypha utricula (Schmidt, 1869) accepted as Sycandra utriculus (Schmidt, 1869)
• Scypha villosa (Haeckel, 1870)
• Streptoconus australe Jenkin, 1908 accepted as Sycon australe (Jenkin, 1908)
• Streptoconus australis Jenkin, 1908
• Sycaltis conifera Haeckel, 1870
• Sycaltis glacialis Haeckel, 1870
• Sycaltis leuconides Bidder, 1891 accepted as Leucilla leuconides (Bidder, 1891)
• Sycaltis leuconoides
• Sycaltis ovipara
• Sycaltis oviparus Haeckel, 1872 accepted as Amphoriscus oviparus (Haeckel, 1872)
• Sycaltis perforata
• Sycaltis perforatus Haeckel, 1872 accepted as Amphoriscus perforatus (Haeckel, 1872)
• Sycaltis testipara
• Sycaltis testiparus Haeckel, 1872 accepted as Amphoriscus testiparus (Haeckel, 1872)
• Sycarium ampulla Haeckel, 1870 accepted as Sycon ampulla (Haeckel, 1870)
• Sycarium erinaceus Haeckel, 1872 accepted as Sycon humboldtii (Risso, 1826) accepted as Sycon humboldti Risso, 1827
• Sycarium vesica Haeckel, 1870 accepted as Sycon raphanus Schmidt, 1862
• Sycarium villosum Haeckel, 1870 accepted as Sycon villosum (Haeckel, 1870)
• Sycetta antarctica (Brøndsted, 1931)
• Sycetta asconoides Breitfuss, 1896
• Sycetta conifera (Haeckel, 1870)
• Sycetta cupula Haeckel, 1872 accepted as Grantia cupula (Haeckel, 1872)
• Sycetta primitiva Haeckel, 1872 accepted as Sycettaga primitiva Haeckel, 1872
• Sycetta quadriradiata Hozawa, 1929
• Sycetta sagitta de Laubenfels, 1942
• Sycetta sagittifera Haeckel, 1872
• Sycetta stauridia Haeckel, 1872 accepted as Sycettusa stauridia (Haeckel, 1872)
• Sycetta strobilus Haeckel, 1872
• Sycettaga primitiva Haeckel, 1872
• Sycocystis oviformis Haeckel, 1870 accepted as Sycon ciliatum (Fabricius, 1780)
• Sycodendron procumbens Haeckel, 1870 accepted as Sycon raphanus Schmidt, 1862
• Sycodendrum ramosum Haeckel, 1870 accepted as Sycon ciliatum (Fabricius, 1780)
• Sycon abyssale Borojevic & Graat-Kleeton, 1965
• Sycon acanthoxea (Little, 1963)
• Sycon album Tanita, 1942
• Sycon ampulla (Haeckel, 1870)
• Sycon antarcticum (Jenkin, 1908)
• Sycon arcticum (Haeckel, 1870)
• Sycon asperum (Gibson, 1886)
• Sycon asperum Lambe, 1896 accepted as Sycon lambei Dendy & Row, 1913
• Sycon asperum Schmidt, 1862 accepted as Leucandra aspera (Schmidt, 1862)
• Sycon australe (Jenkin, 1908)
• Sycon barbadense (Schuffner, 1877)
• Sycon boomerang Dendy, 1893 accepted as Grantessa boomerang (Dendy, 1893)
• Sycon boreale (Schuffner, 1877)
• Sycon brasiliense Borojevic, 1971
• Sycon calcaravis Hozawa, 1929
• Sycon caminatum Thacker, 1908
• Sycon capillosum (Schmidt, 1862) accepted as Grantia capillosa (Schmidt, 1862)
• Sycon capricorn Wörheide & Hooper, 2003
• Sycon carteri Dendy, 1893
• Sycon ciliata (Fabricius, 1780)
• Sycon ciliatum (Fabricius, 1780)
• Sycon coacta Urban, 1905 accepted as Scypha coacta (Urban, 1905)
• Sycon coactum (Urban, 1906)
• Sycon compactum Fabricius, 1780 accepted as Scypha compactum (Lambe, 1893)
• Sycon compactum Lambe, 1893
• Sycon compressum (Fabricius, 1780) accepted as Grantia compressa (Fabricius, 1780)
• Sycon coronatum (Ellis & Solander, 1786) accepted as Scypha coronata (Ellis & Solander, 1786)
• Sycon cylindricum Tanita, 1942
• Sycon defendens Borojevic, 1967
• Sycon dendyi Kirk, 1895 accepted as Sycute dendyi (Kirk, 1895)
• Sycon digitiforme Hozawa, 1929
• Sycon dunstervillia (Haeckel, 1872)
• Sycon eglintonense Lambe, 1900 accepted as Sycon eglintonensis Lambe, 1900
• Sycon eglintonensis Lambe, 1900
• Sycon elegans (Bowerbank, 1845)
• Sycon ensiferum Dendy, 1893