- gabrieli Cotton, 1934 = Bankia australis (family Teredinidae – Bankiinae)
- gabrieli May, 1911 = Dentimargo gabrieli (family Marginellidae – Marginellinae)
- gabrieli May, 1911 = Mesoginella gabrieli (family Marginellidae – Marginellinae)
- gabrieli Pritchard & Gatliff, 1899 = Paracuneus immaculatus (family Drillidae)
- gaimardi Iredale, 1929 = Sassia sexcostata (family Ranellidae – Cymatiinae)
- galactites Lamarck, 1818 = Venerupis galactites (family Veneridae – Tapetinae)
- galaxias Berry, 1918 = Enoploteuthis galaxias (family Enoploteuthidae)
- galbina Hedley & May, 1908 = Nanula galbina (family Trochidae – Trochinae)
- galbinia Laseron, 1950 = Eatoniella galbinia (family Eatoniellidae)
- gallinula Lamarck, 1818 = Tawera gallinula (family Veneridae – Chioninae)
- galloprovincialis planulatus Lamarck, 1819 = Mytilus galloprovincialis planulatus (family Mytilidae)
- gatliffi Ashby, 1919 = Acanthochitona gatliffi (family Acanthochitonidae – Acanthochitoninae)
- gatliffi May, 1911 = Alaginella gatliffi (family Marginellidae – Marginellinae)
- gatliffi Verco, 1909 = Aesopus gatliffi (family Columbellidae – Atilinae)
- gaza Iredale, 1924 = Amalda petterdi (family Olividae – Ancillariinae)
- gealei Angas, 1873 = Tucetona gealei (family Glycymerididae)
- gemellus Iredale, 1926 = Sepia cultrata (family Sepiidae)
- gemina Iredale, 1929 = Lima nimbifer (family Limidae)
- geminata Hedley, 1912 = Protoginella geminata (family Marginellidae – Marginellinae)
- gemma Laseron, 1950 = Pisinna approxima (family Anabathridae)
- gemmegens Verco, 1909 = Teretriphora gemmegens (family Triphoridae – Triphorinae)
- gemmifera Euthyme, 1889 = Ranella australasia australasia (family Ranellidae – Ranellinae)
- generosus Iredale, 1936 = Siphonochelus syringianus (family Muricidae – Typhinae)
- georgiana May, 1915 = Austroginella georgiana (family Marginellidae – Marginellinae)
- georgiana Quoy & Gaimard, 1834 = Electroma georgiana (family Pteriidae)
- gertrudis Tenison Woods, 1876 = Rissoina gertrudis (family Rissoidae – Rissoininae)
- giardi Fischer, 1895 = Pterygioteuthis giardi (family Pyroteuthidae)
- gibba Olivi, 1792 = Varicorbula gibba (family Corbulidae – Corbulinae)
- gibbosus Verco, 1911 = Polyschides gibbosus (family Gadilidae)
- gigantea Deshayes, 1830 = Gastrochaena cuneiformis (family Gastrochaenidae)
- gigas Thunberg, 1793 = Crassostrea gigas (family Ostreidae – Crassostreinae)
- gilchristi Robson, 1924 = Abraliopsis gilchristi (family Enoploteuthidae)
- glabra Laseron, 1953 = Mysella ovata (family Galeommatidae)
- glabra Swainson, 1821 = Mitra glabra (family Mitridae – Mitrinae)
- glabra Swainson, 1822 = Haliotis laevigata (family Haliotidae)
- glabrata Schröter, 1788 (non Linnaeus) = Mactra australis (family Mactridae – Mactrinae)
- glabrella Lamarck, 1818 = Paphies cuneata (family Mesodesmatidae – Mesodesmatinae)
- glaciala Laseron, 1954 = Bouchetriphora pallida (family Triphoridae – Triphorinae)
- glaucus Gray, 1828 = Chiton glaucus (family Chitonidae – Chitoninae)
- glaucus Quoy & Gaimard, 1835 = Plaxiphora albida (family Mopaliidae)
- globosa Sowerby, 1832 = Niveria globosa (family Triviidae)
- globosa Swainson, 1826 = Janthina exigua (family Janthinidae)
- globosa Tenison Woods, 1876 = Eunaticina umbilicata (family Naticidae – Naticinae)
- globularis Lamarck, 1818 = Felaniella globularis (family Ungulinidae)
- glypta Sykes, 1896 = Bassethullia glypta (family Acanthochitonidae – Acanthochitoninae)
- godeffroyana Donald, 1900 = Colpospira atkinsoni (family Turritellidae – Turritellinae)
- godfreyi Cotton, 1938 = Epitonium minorum (family Epitoniidae)
- goldsteini Tenison Woods, 1876 = Dermomurex goldsteini (family Muricidae – Muricinae)
- goniochila A. Adams, 1860 = Alaba translucida (family Litiopidae)
- gouldi McCoy, 1888 = Nototodarus gouldi (family Ommastrephidae)
- gracilis May, 1911 = Dentimargo maugeana (family Marginellidae – Marginellinae)
- gracilis Pfeffer, 1884 = Brachioteuthis riisei (family Brachioteuthidae)
- gracilis Philippi, 1851 = Phasianotrochus eximius (family Trochidae – Trochinae)
- gracilis Reeve, 1860 fig. 9 not fig. 28 = Laternula laterna (family Laternulidae)
- gracilis Risbec, 1928 = Embletonia gracilis (family Embletoniidae)
- granaria Kiener, 1842 = Cacozeliana granaria (family Cerithiidae – Bittiinae)
- grandiculus Iredale, 1924 = Fusinus novaehollandiae (family Fasciolariidae – Fusininae)
- grandis Gray, 1839 = Penion mandarinus (family Buccinidae – Siphonaliinae)
- granifera Brazier, 1894 = Tetraphora granifera (family Triphoridae – Triphorinae)
- granosa Quoy & Gaimard, 1834 = Opalia granosa (family Epitoniidae)
- granosa Sowerby, 1832 = Cancellaria granosa (family Cancellariidae – Cancellariinae)
- granostriata Pilsbry, 1894 = Acanthochitona granostriata (family Acanthochitonidae – Acanthochitoninae)
- granulata Reeve, 1873 = Opalia granosa (family Epitoniidae)
- granulata Swainson, 1855 = Astralium aureum (family Turbinidae – Turbininae)
- granulata Tate, 1892 non Nyst & Westendorp, 1839 = Poromya illevis (family Poromyidae – Poromyinae)
- granulifera Tenison Woods, 1876 = Colpospira australis (family Turritellidae – Turritellinae)
- granulosa Macpherson, 1955 = Lottia mixta (family Lottiidae – Lottiinae)
- granulosa Sowerby, 1844 = Opalia granosa (family Epitoniidae)
- granulosissima Tenison Woods, 1878 = Turrella granulosissima (family Conidae – Mangeliinae)
- grata Deshayes, 1853 = Dosinia grata (family Veneridae – Dosiniinae)
- gravicosta Laseron, 1954 = Liotella petalifera (family Turbinidae – Skeneinae)
- gravispinosa Kuroda & Habe, 1950 = Bostrycapulus pretzgeri (family Calyptraeidae)
- grayana Dunker, 1857 = Glycymeris grayana (family Glycymerididae)
- grayi A. Adams & Angas = Choriplax grayi (family Choriplacidae)
- greeni Burn, 1966 = Aphelodoris greeni (family Dorididae)
- gregaria Laseron, 1950 = Pseudopisinna gregaria gregaria (family Cingulopsidae)
- gregaria Laseron, 1955 = Tricolia variabilis (family Phasianellidae – Tricoliinae)
- grenningi Iredale, 1936 = Bankia australis (family Teredinidae – Bankiinae)
- grimaldii Joubin, 1895 = Lepidoteuthis grimaldii (family Lepidoteuthidae)
- griseus Lamarck, 1818 = Irus griseus (family Veneridae – Tapetinae)
- gruneri Philippi, 1846 = Turbo gruneri (family Turbinidae – Turbininae)
- gunni Reeve, 1847 = Cryptoplax striata (family Cryptoplacidae)
- gunnii Reeve, 1848 = Gazameda gunnii (family Turritellidae – Turritellinae)
- gunteri Cotton & Godfrey, 1933 = Thieleella gunteri (family Anatomidae)