• Conus (Gastridium) Modeer, 1793 represented as Conus Linnaeus, 1758
• Conus (Gastridium) cuvieri Crosse, 1858 represented as Conus cuvieri Crosse, 1858
• Conus (Gastridium) eldredi J. P. E. Morrison, 1955 represented as Conus eldredi J. P. E. Morrison, 1955
• Conus (Gastridium) fragilissimus Petuch, 1979 represented as Conus fragilissimus Petuch, 1979
• Conus (Gastridium) geographus Linnaeus, 1758 represented as Conus geographus Linnaeus, 1758
• Conus (Gastridium) obscurus G. B. Sowerby I, 1833 represented as Conus obscurus G. B. Sowerby I, 1833
• Conus (Gastridium) tulipa Linnaeus, 1758 represented as Conus tulipa Linnaeus, 1758
• Gastridium G. B. Sowerby II, 1842 † accepted as Pseudoliva Swainson, 1840
• Gastridium Lyngbye, 1819 accepted as Chylocladia Greville, 1833
• Gastridium Modeer, 1793 accepted as Conus (Gastridium) Modeer, 1793 represented as Conus Linnaeus, 1758
• Gastridium articulatum (Turner) Greville, 1830 accepted as Lomentaria articulata (Hudson) Lyngbye, 1819
• Gastridium cepa G. B. Sowerby I, 1846 † accepted as Testallium cepa (G. B. Sowerby I, 1846) †
• Gastridium clavellosum (Turner) Lyngbye, 1819 accepted as Lomentaria clavellosa (Lightfoot ex Turner) Gaillon, 1828
• Gastridium constrictum Suhr, 1840 (uncertain)
• Gastridium corallinum Suhr, 1836 accepted as Erythroclonium corallinum (Suhr) Holmes, 1896
• Gastridium corymbosum Suhr, 1840 (uncertain)
• Gastridium cuvieri (Crosse, 1858) accepted as Conus (Gastridium) cuvieri Crosse, 1858 represented as Conus cuvieri Crosse, 1858
• Gastridium eldredi (J. P. E. Morrison, 1955) accepted as Conus (Gastridium) eldredi J. P. E. Morrison, 1955 represented as Conus eldredi J. P. E. Morrison, 1955
• Gastridium filiforme (Hornemann) Lynbye, 1819 accepted as Dumontia contorta (S.G.Gmelin) Ruprecht, 1850
• Gastridium filiforme var. flavum Lyngbye, 1819 accepted as Dumontia contorta (S.G.Gmelin) Ruprecht, 1850
• Gastridium filiforme var. incrassatum (O.F.Müller) Lyngbye, 1819 accepted as Dumontia contorta (S.G.Gmelin) Ruprecht, 1850
• Gastridium filiforme var. intestiniformis Liebmann, 1845 accepted as Dumontia contorta (S.G.Gmelin) Ruprecht, 1850
• Gastridium filiforme var. rugosum O.F.Müller ex Lyngbye, 1819 accepted as Dumontia contorta (S.G.Gmelin) Ruprecht, 1850
• Gastridium filiforme var. spongiforme (O.F.Müller) Lyngbye, 1819 accepted as Dumontia contorta (S.G.Gmelin) Ruprecht, 1850
• Gastridium fragilissimum (Petuch, 1979) accepted as Conus (Gastridium) fragilissimus Petuch, 1979 represented as Conus fragilissimus Petuch, 1979
• Gastridium geographus (Linnaeus, 1758) accepted as Conus (Gastridium) geographus Linnaeus, 1758 represented as Conus geographus Linnaeus, 1758
• Gastridium kaliforme (Goodenough & Woodward) Lyngbye, 1819 accepted as Chylocladia verticillata (Lightfoot) Bliding, 1928
• Gastridium kaliforme var. squarrosum (Kützing) Bertoloni, 1862 accepted as Chylocladia verticillata (Lightfoot) Bliding, 1928
• Gastridium mediterraneum (J.Agardh) Bertoloni, 1862 accepted as Gastroclonium clavatum (Roth) Ardissone, 1883
• Gastridium obscurus (G. B. Sowerby I, 1833) accepted as Conus (Gastridium) obscurus G. B. Sowerby I, 1833 represented as Conus obscurus G. B. Sowerby I, 1833
• Gastridium opimum (Hupé, 1854) † accepted as Testallium cepa (G. B. Sowerby I, 1846) †
• Gastridium opuntium Lyngbye, 1819 accepted as Asperococcus bullosus J.V.Lamouroux, 1813
• Gastridium ovale Lyngbye, 1819 accepted as Derbesia marina (Lyngbye) Solier, 1846
• Gastridium purpurascens Lyngbye, 1819 accepted as Lomentaria clavellosa (Lightfoot ex Turner) Gaillon, 1828
• Gastridium reflexum (Chauvin) Bertoloni, 1862 accepted as Gastroclonium reflexum (Chauvin) Kützing, 1849
• Gastridium retusum R. A. Philippi, 1887 † accepted as Sulcobuccinum retusum (R. A. Philippi, 1887) †
• Gastridium tulipa (Linnaeus, 1758) accepted as Conus (Gastridium) tulipa Linnaeus, 1758 represented as Conus tulipa Linnaeus, 1758
• Gastridium zonatum Suhr, 1834 accepted as Champia compressa Harvey, 1838