• Deltocyathus (Deltocyathus) taiwanicus Hu, 1987 accepted as Deltocyathus taiwanicus Hu, 1987
• Deltocyathus (Levipalifer) orientalis (Vaughan, 1900) accepted as Deltocyathus vaughani Yabe & Eguchi, 1937
• Deltocyathus (Paradeltocyathus) australiensis (Duncan, 1870) accepted as Peponocyathus australiensis (Duncan, 1870)
• Deltocyathus (Paradeltocyathus) orientalis Duncan, 1876 accepted as Peponocyathus orientalis (Duncan, 1876)
• Deltocyathus agassizi Pourtalès, 1867 accepted as Deltocyathus agassizii Pourtalès, 1867
• Deltocyathus agassizi calcar Pourtalès, 1874 accepted as Deltocyathus calcar Pourtalès, 1874
• Deltocyathus agassizi var. calcar Pourtalès, 1874 accepted as Deltocyathus calcar Pourtalès, 1874
• Deltocyathus agassizii Pourtalès, 1867
• Deltocyathus alatus Tenison-Woods, 1878 † accepted as Notocyathus alatus (Tenison-Woods, 1878) †
• Deltocyathus aldingensis Tenison-Woods, 1878 † accepted as Notocyathus aldingensus (Tenison-Woods, 1878) †
• Deltocyathus analavelonensis (Alloiteau, 1958) †
• Deltocyathus andamanicus Alcock, 1898
• Deltocyathus australis Gerth, 1921 † accepted as Peponocyathus australiensis (Duncan, 1870)
• Deltocyathus calcar Pourtalès, 1874
• Deltocyathus cameratus Cairns, 1999
• Deltocyathus complanatus Squires, 1958 †
• Deltocyathus conicus Zibrowius, 1980 accepted as Deltocyathus italicus (Michelotti, 1838)
• Deltocyathus corrugatus Cairns, 1999
• Deltocyathus crassiseptum Cairns, 1999
• Deltocyathus cylindricus Sismonda, 1871 † accepted as Peponocyathus cylindricus (Sismonda, 1871) †
• Deltocyathus eccentricus Cairns, 1979
• Deltocyathus excisus (Duncan, 1870) † accepted as Idiotrochus emarciatus (Duncan, 1865)
• Deltocyathus fontinalis Dennant, 1904 †
• Deltocyathus formosus Cairns, 1995 accepted as Deltocyathus suluensis Alcock, 1902
• Deltocyathus fragilis Alcock, 1902 accepted as Deltocyathus rotulus (Alcock, 1898)
• Deltocyathus halianthus (Lindström, 1877)
• Deltocyathus heteroclitus Wells, 1984
• Deltocyathus hexagonus (Gravier, 1915) accepted as Fungiacyathus (Bathyactis) marenzelleri (Vaughan, 1906)
• Deltocyathus inusitatus Kitahara & Cairns, 2009
• Deltocyathus italicus (Michelotti, 1838)
• Deltocyathus italicus var. agassizii Pourtalès, 1880 accepted as Deltocyathus italicus (Michelotti, 1838)
• Deltocyathus italicus var. australiensis Duncan, 1870 accepted as Peponocyathus australiensis (Duncan, 1870)
• Deltocyathus italicus var. calcar Pourtalès, 1880 accepted as Deltocyathus italicus (Michelotti, 1838)
• Deltocyathus lens Alcock, 1902 accepted as Peponocyathus orientalis (Duncan, 1876)
• Deltocyathus leupoldi Umbgrove, 1929 †
• Deltocyathus magnificus Moseley, 1876 accepted as Dennantotrochus magnificus (Moseley, 1876)
• Deltocyathus magnificus var. suluensis Alcock, 1902 accepted as Deltocyathus suluensis Alcock, 1902
• Deltocyathus minutus Gardiner & Waugh, 1938 accepted as Peponocyathus orientalis (Duncan, 1876)
• Deltocyathus montserratae (Reig Oriol, 1995) †
• Deltocyathus moseleyi Cairns, 1979
• Deltocyathus murrayi Gardiner & Waugh, 1938
• Deltocyathus nascornatus (Gardiner & Waugh, 1938)
• Deltocyathus orientalis Duncan, 1876 accepted as Peponocyathus orientalis (Duncan, 1876)
• Deltocyathus ornatus Gardiner, 1899
• Deltocyathus parvulus Keller, 1982
• Deltocyathus perexiguus Kitahara & Cairns, 2021
• Deltocyathus philippinensis Cairns & Zibrowius, 1997
• Deltocyathus pourtalesi Cairns, 1979
• Deltocyathus rotaeformis Tenison-Woods, 1878 accepted as Dunocyathus parasiticus Tenison-Woods, 1878
• Deltocyathus rotulus (Alcock, 1898)
• Deltocyathus sarsi (Gardiner & Waugh, 1938)
• Deltocyathus stella Cairns & Zibrowius, 1997
• Deltocyathus stellaris Dennant, 1904 †
• Deltocyathus stellulatus Cairns, 1984 accepted as Bourneotrochus stellulatus (Cairns, 1984)
• Deltocyathus subviola Dennant, 1902 †
• Deltocyathus suluensis Alcock, 1902
• Deltocyathus taiwanicus Hu, 1987
• Deltocyathus tateanus Tenison-Woods, 1878 † accepted as Notocyathus tateanus (Tenison-Woods, 1878) †
• Deltocyathus taurinensis Michelotti, 1871 †
• Deltocyathus tuberculatus Gerth, 1923 †
• Deltocyathus varians Gardiner & Waugh, 1938
• Deltocyathus vaughani Yabe & Eguchi, 1932 (unaccepted > nomen nudum)
• Deltocyathus vaughani Yabe & Eguchi, 1937
• Deltocyathus verconis Dennant, 1904 †
• Deltocyathus vincentinus Dennant, 1904 accepted as Australocyathus vincentinus (Dennant, 1904)
• Deltocyathus viola (Duncan, 1864) † accepted as Notocyathus viola (Duncan, 1864) †
• Discosmilia analavelonensis Alloiteau, 1958 † accepted as Deltocyathus analavelonensis (Alloiteau, 1958) †
• Levipalifer orientalis Vaughan, 1900 accepted as Deltocyathus vaughani Yabe & Eguchi, 1937
• Levipalifer rotulus † (uncertain > unassessed)
• Metadeltocyathus montserratae Reig Oriol, 1995 † accepted as Deltocyathus montserratae (Reig Oriol, 1995) †