• "Lower Heterobranchia"
• [unassigned] Caenogastropoda (temporary name)
• [unassigned] Cardiidae (temporary name)
• [unassigned] Cephalaspidea (temporary name)
• [unassigned] Cladobranchia (temporary name)
• [unassigned] Conoidea (temporary name)
• [unassigned] Decapodiformes (temporary name)
• [unassigned] Doridoidei (temporary name)
• [unassigned] Enteropneusta (temporary name)
• [unassigned] Euheterodonta (temporary name)
• [unassigned] Heterobranchia (temporary name)
• [unassigned] Mitridae (temporary name)
• [unassigned] Neogastropoda (temporary name)
• [unassigned] Oegopsida (temporary name)
• [unassigned] Ostreidae (temporary name)
• [unassigned] Seguenzioidea (temporary name)
• [unassigned] Trochidae (temporary name)
• [unassigned] Gadilida (temporary name)
• [unassigned] Mytilidae (temporary name)
• [unassigned] Pectinidae (temporary name)
• “Montereina” sensu Dayrat, 2010 (temporary name)
• “Montereina” concinna (Alder & Hancock, 1864) represented as Discodoris concinna (Alder & Hancock, 1864)
• Abalistes Jordan & Seale, 1906
• Abalistes stellatus (Anonymous, 1798)
• Abantennarius Schultz, 1957 accepted as Antennarius Daudin, 1816
• Abantennarius dorehensis (Bleeker, 1859)
• Abantennarius nummifer (Cuvier, 1817)
• Abarenicola Wells, 1959
• Abarenicola pacifica Healy & Wells, 1959
• Abathescalpellum Newman & Ross, 1971
• Abathescalpellum fissum (Hoek, 1907)
• Abathescalpellum koreanum (Hiro, 1933)
• Abditodentrix Patterson, 1985
• Abditodentrix rhomboidalis (Millett, 1899) accepted as Tortoplectella rhomboidalis (Millett, 1899)
• Abdopus Norman & Finn, 2001
• Abdopus aculeatus (d'Orbigny [in A. Férussac & d'Orbigny], 1834)
• Abelbolla Huang & Zhang, 2004
• Abelbolla boucheri Huang & Zhang, 2004
• Abelbolla huanghaiensis Huang & Zhang, 2004
• Abelbolla warwicki Huang & Zhang, 2004
• Abietinaria Kirchenpauer, 1884
• Ablabys Kaup, 1873
• Ablabys macracanthus (Bleeker, 1852)
• Ablabys taenianotus (Cuvier, 1829)
• Ablennes Jordan & Fordice, 1887
• Ablennes hians (Valenciennes, 1846)
• Abra Lamarck, 1818
• Abra fujitai Habe, 1958
• Abra inanis Prashad, 1932
• Abra kinoshitai (Kuroda & Habe, 1958)
• Abra kurodai Habe, 1961 accepted as Abra fujitai Habe, 1958
• Abra lunella (A. Gould, 1861)
• Abra maxima (G. B. Sowerby III, 1894) accepted as Abra philippinensis (E. A. Smith, 1885)
• Abra philippinensis (E. A. Smith, 1885)
• Abra profundorum (E. A. Smith, 1885)
• Abra profundorum japonicum Okutani, 1975 accepted as Abra profundorum (E. A. Smith, 1885)
• Abra sibogai Prashad, 1932
• Abralia Gray, 1849
• Abralia (Abralia) Gray, 1849 represented as Abralia Gray, 1849
• Abralia (Abralia) multihamata Sasaki, 1929 represented as Abralia multihamata Sasaki, 1929
• Abralia (Heterabralia) Tsuchiya & Okutani, 1988 represented as Abralia Gray, 1849
• Abralia (Heterabralia) andamanica Goodrich, 1896 represented as Abralia andamanica Goodrich, 1896
• Abralia andamanica Goodrich, 1896
• Abralia multihamata Sasaki, 1929
• Abraliopsis Joubin, 1896
• Abraliopsis (Micrabralia) Pfeffer, 1900 represented as Abraliopsis Joubin, 1896
• Abraliopsis (Micrabralia) lineata Goodrich, 1896 represented as Abraliopsis lineata (Goodrich, 1896)
• Abraliopsis lineata (Goodrich, 1896)
• Abrina Habe, 1952 accepted as Abra Lamarck, 1818
• Abrina inanis (Prashad, 1932) accepted as Abra inanis Prashad, 1932
• Abrina lunella (A. Gould, 1861) accepted as Abra lunella (A. Gould, 1861)
• Abrina sibogai (Prashad, 1932) accepted as Abra sibogai Prashad, 1932
• Abrina skinoshitai [sic] accepted as Abra kinoshitai (Kuroda & Habe, 1958)
• Abudefduf Forsskål, 1775
• Abudefduf bengalensis (Bloch, 1787)
• Abudefduf lorenzi Hensley & Allen, 1977
• Abudefduf notatus (Day, 1870)
• Abudefduf septemfasciatus (Cuvier, 1830)
• Abudefduf sexfasciatus (Lacepède, 1801)
• Abudefduf sordidus (Forsskål, 1775)
• Abudefduf vaigiensis (Quoy & Gaimard, 1825)
• Abyla Quoy & Gaimard, 1827
• Abyla bicarinata Moser, 1925
• Abyla brownia Sears, 1953 accepted as Abyla bicarinata Moser, 1925
• Abyla carina Haeckel, 1888 accepted as Abyla trigona Quoy & Gaimard, 1827
• Abyla haeckeli Lens & van Riemsdijk, 1908
• Abyla ingeborgae Sears, 1953 accepted as Abyla haeckeli Lens & van Riemsdijk, 1908
• Abyla peruana Sears, 1953 accepted as Abyla trigona Quoy & Gaimard, 1827
• Abyla schmidti Sears, 1953 accepted as Abyla trigona Quoy & Gaimard, 1827
• Abyla tottoni Sears, 1953 accepted as Abyla bicarinata Moser, 1925
• Abyla trigona Quoy & Gaimard, 1827
• Abylidae L. Agassiz, 1862
• Abylinae L. Agassiz, 1862
• Abylopsinae Totton, 1954
• Abylopsis Chun, 1888
• Abylopsis eschscholtzii (Huxley, 1859)
• Abylopsis tetragona (Otto, 1823)
• Acabaria Gray, 1859 accepted as Melithaea Milne Edwards, 1857
• Acabaria formosa Nutting, 1911 accepted as Melithaea formosa (Nutting, 1911)
• Acabaria philippinensis (Wright & Studer, 1889) accepted as Melithaea philippinensis (Wright & Studer, 1889)