- jacksonensis Angas, 1877 = Guraleus jacksonensis (family Conidae – Mangeliinae)
- jacksonensis Angas, 1877 = Guraleus jacksonensis (family Conidae – Mangeliinae)
- jacksonensis E. A. Smith, 1885 = Mactra jacksonensis (family Mactridae – Mactrinae)
- jacksonensis E. A. Smith, 1885 = Wallucina assimilis (family Lucinidae)
- jacksonensis Laseron, 1953 = Condylocardia notoaustralis (family Condylocardiidae – Condylocardiinae)
- jacksonensis Laseron, 1954 = Tetraphora granifera (family Triphoridae – Triphorinae)
- jacksonensis Lesson, 1831 = Cellana tramoserica (family Nacellidae)
- jacksoni Brazier, 1895 = Amphithalamus jacksoni (family Anabathridae)
- jacksoniana Garrard, 1976 = Terebra jacksoniana (family Terebridae – Terebrinae)
- jacobeus byronensis Fleming, 1953 = Pecten fumatus (family Pectinidae – Pectininae)
- jaenschi Cotton, 1931 = Sepia hedleyi (family Sepiidae)
- jaffa Cotton, 1944 = Dentimargo jaffa (family Marginellidae – Marginellinae)
- jaffaensis Cotton & Godfrey, 1932 = Austromitra analogica (family Costellariidae)
- jaffaensis Verco, 1909 = Eudaronia jaffaensis (family Turbinidae – Skeneinae)
- jaffaensis Verco, 1910 = Paxula jaffaensis (family Columbellidae – Atiliinae)
- janjucensis Gatliff & Gabriel, 1913 = Microdryas janjucensis (family Anabathridae)
- janjukia Burn, 1962 = Polycera janjukia (family Polyceridae – Polycerinae)
- janthina Linnaeus, 1758 = Janthina janthina (family Janthinidae)
- jattai Pfeffer, 1900 = Lycoteuthis lorigera (family Lycoteuthidae)
- javanica Blainville, 1827 = Siphonaria diemenensis (family Siphonariidae)
- javanicensis Lamarck, 1822 = Amblychilepas javanicensis (family Fissurellidae – Fissurellinae)
- johnstoni Ashby, 1923 = Acanthochitona bednalli (family Acanthochitonidae – Acanthochitoninae)
- johnstoni Beddome, 1883 = Liotella johnstoni (family Turbinidae – Skeneinae)
- johnstoni Petterd, 1884 = Austroginella johnstoni (family Marginellidae – Marginellinae)
- johnstoni Petterd, 1884 = Seila crocea (family Cerithiopsidae – Seilinae)
- josephi Tenison Woods, 1877 = Charisma josephi (family Trochidae – Halistylinae)
- joshuana Gatliff & Gabriel, 1910 = Eulima joshuana (family Eulimidae)
- jucunda Angas, 1877 = Pyrgiscus fuscus (family Pyramidellidae – Turbonillinae)
- jugosa Gould, 1846 = Rhyssoplax jugosa (family Chitonidae – Chitoninae)
- jukesianum Forbes, 1852 = Epitonium jukesianum (family Epitoniidae)
- juliae Burn, 1966 = Aphelodoris juliae (family Dorididae)
- juliana Quoy & Gaimard, 1832 = Aplysia juliana (family Aplysiidae – Aplysiinae)