- hyemalis, Aviculopecten hyemalis Salter, 1865 † - syn of: Etheripecten hiemalis (Salter, 1865 †) - (AVICULOPECTINIDAE) (FOSSIL)
- hyemalis, Mangelia hyemalis (J.F. Mabille & A. de Rochebrune, 1889) - (MANGELIIDAE)
- hyemalis, Pleurotoma hyemalis J.F. Mabille & A. de Rochebrune, 1889 - syn of: Mangelia hyemalis (J.F. Mabille & A. de Rochebrune, 1889) - (TURRIDAE)
- hyematus, Drymaeus hyematus (L.A. Reeve, 1848) - (BULIMULIDAE)
- hyerensis, Alvania hyerensis S. Gofas, 2007 - (RISSOIDAE)
- hyerogliphicula, Rissoina hyerogliphicula D. Pantanelli, 1888 † - (RISSOINIDAE) (FOSSIL)
- hyeroglyphica, Lioconcha hyeroglyphica T.A. Conrad, 1837 - syn of: Lioconcha hieroglyphica (T.A. Conrad, 1837) - (VENERIDAE)
- hyfifluxi, Phymorhynchus hyfifluxi L.A. Beck, 1996 - (RAPHITOMIDAE)
- Hygrobium, syn of: Genus Craspedopoma L. Pfeiffer, 1847 (CRASPEDOPOMATIDAE)
- Hygrohelicopsis, Genus Hygrohelicopsis A.A. Schileyko, 1978 (HYGROMIIDAE)
- hygrohylaea, Helix hygrohylaea D'Orbigny, 1835 - syn of: Drymaeus abyssorum (A.V.M.D. D'Orbigny, 1835) - (HELICIDAE)
- hygrohylaeus, Drymaeus hygrohylaeus D'Orbigny, 1835 - syn of: Drymaeus abyssorum (A.V.M.D. D'Orbigny, 1835) - (BULIMULIDAE)
- Hygromane, syn of: Genus Hygromia A. Risso, 1826 (HYGROMIIDAE)
- Hygromanes, syn of: Genus Hygromia A. Risso, 1826 (HYGROMIIDAE)
- Hygromia, Genus Hygromia A. Risso, 1826 (HYGROMIIDAE)
- HYGROMIIDAE Tryon, 1866 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-PULMONATA [Infraclass]-STYLOMMATOPHORA [Order]-HYGROMIOIDEA [Superfamily])
- HYGROPHILA (UNASSIGNED) - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-PULMONATA [Infraclass]-HYGROPHILA [Order]) (FOSSIL)
- hylaea, Rhipidodonta hylaea (A.V.M.D. D'Orbigny, 1835) - (HYRIIDAE)
- hylaea, Unio hylaea D'Orbigny, 1835 - syn of: Rhipidodonta hylaea (A.V.M.D. D'Orbigny, 1835) - (UNIONIDAE)
- hylaea asuncionis, Rhipidodonta hylaea asuncionis (W.B. Marshall, 1922) - (HYRIIDAE)
- hylaea guaranianus, Rhipidodonta hylaea guaranianus (A.V.M.D. D'Orbigny, 1835) - (HYRIIDAE)
- hylas, Coelostylina hylas E.A.L. Kittl, 1894 † - (COELOSTYLINIDAE) (FOSSIL)
- hylephilus, Rectartemon hylephilus (A.V.M.D. D'Orbigny, 1835) - (STREPTAXIDAE)
- hylikos, Clavus hylikos R.N. Kilburn, A.E. Fedosov & Y.I. Kantor, 2014 - (DRILLIIDAE)
- hylkiae, Parachiton hylkiae (H.L. Strack, 1993) - (LEPTOCHITONIDAE)
- hylkiae mauricejayi, Parachiton hylkiae mauricejayi E. Schwabe, 2002 - (LEPTOCHITONIDAE)
- hyllebergi, Vasticardium hyllebergi N.N. Thach, 2014 - (CARDIIDAE)
- hyllebergi, Euprymna hyllebergi A. Nateewathana, 1997 - (SEPIOLIDAE)
- Hyllus, Genus Hyllus Wade, 1917 † (FASCIOLARIIDAE) (FOSSIL)
- Hylocyclis, syn of: Genus Hyalocylis L. de Folin, 1875 (CRESEIDAE)
- hylonomia, Riedelia hylonomia J.R. Bourguignat in É.A.A. Locard, 1882 - syn of: Hygromia limbata (J.P.R. Draparnaud, 1805) - (HYGROMIIDAE)
- Hylopecten, syn of: Genus Hyalopecten A.E. Verrill, 1897 (PECTINIDAE)
- Hylophaga, syn of: Genus Xylophaga W.H. Turton, 1822 (XYLOPHAGAIDAE)
- Hylotachea, syn of: Genus Macularia J.A. Albers, 1850 (HELICIDAE)
- hyltoni, Drymaeus hyltoni J.J. Parodíz, 1957 - (BULIMULIDAE)
- hyltonscottae, Bostryx hyltonscottae J.J. Parodíz, 1956 - (BULIMULIDAE)
- hyltonscottae, Zilchogyra hyltonscottae W.K. Weyrauch, 1965 - (HELICODISCIDAE)
- hylus, Nassarius hylus A.A. Olsson, 1964 † - (NASSARIIDAE) (FOSSIL)
- Hymanarion, Genus Hymanarion Stanisic, 2010 (HELICARIONIDAE)
- Hymeneaeolis, syn of: Genus Fiona J. Alder & A. Hancock, 1851 (FIONIDAE)
- Hymenoteuthis, syn of: Genus Vampyroteuthis C. Chun, 1903 (VAMPYROTEUTHIDAE)
- hymetti, Thiessea hymetti (A. Mousson, 1854) - (HELICIDAE)
- hymettii, Chilostoma sphaeriostoma hymettii W. Kobelt, 1876 - (HELICIDAE)
- hynicola, Helix hynicola J.F. Mabille - syn of: Arianta xatarti J.N. Farines, 1834 - (HELICIDAE)
- Hynnites, syn of: Genus Hinnites J.L.M. Defrance, 1821 (PECTINIDAE)
- Hyolithes, Genus Hyolithes d'Eichwald , 1840 † (HYOLITHIDAE) (FOSSIL)
- HYOLITHIDA (UNASSIGNED) - Family (HYOLITHA-HYOLITHIDA [Order]) (FOSSIL)
- HYOLITHIDAE Nicholson, 1889 † - Family (HYOLITHA-HYOLITHIDA [Order]) (FOSSIL)
- Hyolithus, Genus Hyolithus Poulsen, 1932 † (CRESTJAHITIDAE) (FOSSIL)
- Hyolithus, syn of: Genus Hyolithes d'Eichwald , 1840 † (HYOLITHIDAE) (FOSSIL)
- hyotanseana, Lepidozona hyotanseana W.L. Wu & T.A. Okutani, 1986 - (ISCHNOCHITONIDAE)
- hyotidoidea, Ostrea hyotidoidea R. Tate, 1899 † - (OSTREIDAE) (FOSSIL)
- hyotiformis, Lopha hyotiformis R.A. Philippi, 1901 † - (OSTREIDAE) (FOSSIL)
- hyotis, Hyotissa hyotis (C. Linnaeus, 1758) - (GRYPHAEIDAE)
- hyotis, Mytilus hyotis C. Linnaeus, 1758 - syn of: Hyotissa hyotis (C. Linnaeus, 1758) - (MYTILIDAE)
- hyotis, Ostrea hyotis H.H. Suter, 1913 - syn of: Ostrea chilensis R.A. Philippi, 1844 - (OSTREIDAE)
- hyotis, Ostrea hyotis C. Linnaeus, 1758 - syn of: Hyotissa hyotis (C. Linnaeus, 1758) - (OSTREIDAE)
- Hyotissa, Genus Hyotissa H.B. Stenzel, 1971 (GRYPHAEIDAE)
- Hyotissocameleo, Genus Hyotissocameleo Zakhera et al., 2001 † (OSTREIDAE) (FOSSIL)
- Hypacanthoplites, Genus Hypacanthoplites Spath , 1923 † (PARAHOPLITIDAE) (FOSSIL)
- hypaeana, Xerotricha hypaeana J.R. Bourguignat in É.A.A. Locard, 1882 - syn of: Xerotricha apicina (J.B.P.A. Lamarck, 1822) - (HYGROMIIDAE)
- hypaena, Candidula hypaena J. Germain, 1930 - syn of: Candidula gigaxii (L. Pfeiffer, 1850) - (HYGROMIIDAE)
- hypaeschra, Anodonta hypaeschra G. Servain, 1885 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- Hypanis, Genus Hypanis K.E.I. von Eichwald, 1838 (CARDIIDAE)
- Hyparpadites, Genus Hyparpadites Spath, 1951 † (TRACHYCERATIDAE) (FOSSIL)
- Hypasteroceras, Genus Hypasteroceras Spath , 1923 † (ARIETITIDAE) (FOSSIL)
- hypatia, Odostomia hypatia W.H. Dall & P. Bartsch, 1912 - (PYRAMIDELLIDAE)
- hypatiae, Vexillum hypatiae (P.M. Pallary, 1912) - (COSTELLARIIDAE)
- Hypelasma, Genus Hypelasma Paquier, 1897 † (REQUIENIIDAE) (FOSSIL)
- hypelliptica, Abranda hypelliptica (A.E. Salisbury, 1934) - (TELLINIDAE)
- Hypengonoceras, Genus Hypengonoceras Spath , 1922 † (KNEMICERATIDAE) (FOSSIL)
- Hyperacanthus, Genus Hyperacanthus Koken, 1894 † (ARCHAEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- hyperaptyx, Heterozaptyx hyperaptyx (H.A. Pilsbry, 1905) - (CLAUSILIIDAE)
- Hyperaulax, Genus Hyperaulax H.A. Pilsbry, 1897 (ODONTOSTOMIDAE)
- hyperbolaris, Keuppia hyperbolaris A. Fuchs, Bracchi & Weis, 2009 † - (PALAEOCTOPODIDAE) (FOSSIL)
- hyperbolicum, Goliathiceras hyperbolicum (Leckenby) † - (CARDIOCERATIDAE) (FOSSIL)
- hyperboraea, Deacheospira hyperboraea (E.F.R.K. Koken, 1889 †) - (GOSSELETINIDAE) (FOSSIL)
- hyperborea, Zeusia hyperborea Korshunova, Zimina & Martynov, 2017 - (AEOLIDIIDAE)
- hyperborea, Taonius hyperborea A.E. Verrill, 1881 - syn of: Taonius pavo (C.A. Lesueur, 1821) - (CRANCHIIDAE)
- hyperborea, Leachia hyperborea J.J.S. Steenstrup, 1856 - syn of: Teuthowenia megalops (V. Prosch, 1849) - (CRANCHIIDAE)
- hyperborea, Leptostega hyperborea Parkhaev, 2005 † - (HELCIONELLIDAE) (FOSSIL)
- hyperborea, Limatula hyperborea A.S. Jensen, 1905 - (LIMIDAE)
- hyperborea, Nucula hyperborea A.A. Gould, 1841 - syn of: Yoldia hyperborea (A.A. Gould, 1841) - (NUCULIDAE)
- hyperborea, Yoldia hyperborea (A.A. Gould, 1841) - (YOLDIIDAE)
- hyperborea, Yoldia hyperborea Torrell, 1859 - syn of: Yoldia hyperborea (A.A. Gould, 1841) - (YOLDIIDAE)
- hyperborea limatuloides, Yoldia hyperborea limatuloides K.W. Ockelmann, 1954 - (YOLDIIDAE)
- hyperboreum, Pachtoceras hyperboreum P.A. Zhuravleva, 1972 † - (ONCOCERIDA (UNASSIGNED)) (FOSSIL)
- hyperboreus, Phragmolites hyperboreus Troedsson, 1928 † - (BUCANIIDAE) (FOSSIL)
- hyperboreus, Ceratites hyperboreus Mojsisovics, 1886 † - syn of: Timoceras glacialis (Mojsisovics, 1886 †) - (CERATITIDAE) (FOSSIL)
- hyperboreus, Limax hyperboreus C.A. Westerlund, 1876 - syn of: Deroceras laeve (O.F. Müller, 1774) - (LIMACIDAE)
- hyperboreus, Pseudofoordites hyperboreus Bogoslovsky, 1959 † - (PINACITIDAE) (FOSSIL)
- hypercalles, Eucithara hypercalles J.C. Melvill, 1898 - syn of: Eucithara fusiformis (L.A. Reeve, 1846) - (MANGELIIDAE)
- Hyperderoceras, Genus Hyperderoceras Simpson, 1855 † (EODEROCERATIDAE) (FOSSIL)
- hyperephanus, Unio hyperephanus J. Da Silva e Castro, 1885 - syn of: Unio abrantesianus É.A.A. Locard, 1899 - (UNIONIDAE)
- hypergonia, Aclis hypergonia J.S. Schwengel & J.T.L. McGinty, 1942 - (ACLIDIDAE)
- Hypergonia, Genus Hypergonia Donald , 1892 † (ORTHONEMIDAE) (FOSSIL)
- Hypergoniatites, Genus Hypergoniatites Ruzhencev & Bogoslovskaya, 1970 † (GONIATITIDAE) (FOSSIL)
- hyperhemileuron, Dentalium hyperhemileuron J.C. Verco, 1911 - (DENTALIIDAE)
- Hyperia, syn of: Genus Cuvierina J.E.V. Boas, 1886 (CUVIERINIDAE)
- hyperia, Pseudotaranis hyperia (W.H. Dall, 1919) - (PSEUDOMELATOMIDAE)
- hyperia, Holospira hyperia P. Bartsch, 1926 - (UROCOPTIDAE)
- hyperionis, Heliacus hyperionis R. Bieler, 1993 - (ARCHITECTONICIDAE)
- hyperlepta, Ithycythara hyperlepta F. Haas, 1953 - (MANGELIIDAE)
- hyperleuca, Carelia bicolor hyperleuca H.A. Pilsbry, 1911 - (AMASTRIDAE)
- Hyperlia, syn of: Genus Scalenostoma G.P. Deshayes, 1863 (EULIMIDAE)
- Hyperlioceras, Genus Hyperlioceras Buckman, 1907 † (GRAPHOCERATIDAE) (FOSSIL)
- hyperlissa, Xanthodaphne sofia hyperlissa (W.H. Dall, 1889) - (RAPHITOMIDAE)
- hyperlissum, Cerion hyperlissum H.A. Pilsbry & E.G. Vanatta, 1896 - (CERIONIDAE)
- Hypermastus, Genus Hypermastus H.A. Pilsbry, 1899 (EULIMIDAE)
- hypermeces, Unitas hypermeces (A.E.M. Cossmann, 1896 †) - (CANCELLARIIDAE) (FOSSIL)
- hypermeces, Carychium hypermeces Cossmann, 1889 † - (ELLOBIIDAE) (FOSSIL)
- hypermeces, Clavilithes hypermeces A.E.M. Cossmann, 1923 † - (FASCIOLARIIDAE) (FOSSIL)
- hypermeces, Crassispira hypermeces A.E.M. Cossmann, 1889 † - (PSEUDOMELATOMIDAE) (FOSSIL)
- hypermnesta, Pleurotomella hypermnesta J.C. Melvill, 1912 - syn of: Pleurotomella hypermnestra J.C. Melvill, 1912 - (RAPHITOMIDAE)
- hypermnestra, Pleurotomella hypermnestra J.C. Melvill, 1912 - (RAPHITOMIDAE)
- hypernotia, Macromphalina hypernotia H.A. Pilsbry & A.A. Olsson, 1952 - (VANIKORIDAE)
- hyperobia, Hemiphaedusa hyperobia E.C. Von Martens, 1880 - (CLAUSILIIDAE)
- hyperodon, Leptachatina hyperodon H.A. Pilsbry & C.M. Cooke, 1914 - (AMASTRIDAE)
- hyperodon, Siphonalia hyperodon H.A. Pilsbry, 1895 - syn of: Siphonalia mikado J.C. Melvill, 1888 - (BUCCINIDAE)
- hyperodonta, Oligozaptyx hedleyi hyperodonta (H.A. Pilsbry, 1908) - (CLAUSILIIDAE)
- hyperoptyx, Zaptyx hyperoptyx (H.A. Pilsbry, 1900) - (CLAUSILIIDAE)
- hyperoptyx sarissa, Zaptyx hyperoptyx sarissa (H.A. Pilsbry, 1900) - (CLAUSILIIDAE)
- hyperoptyx sezokoensis, Zaptyx hyperoptyx sezokoensis H.A. Pilsbry, 1909 - (CLAUSILIIDAE)
- hyperoptyx yoronjimana, Zaptyx hyperoptyx yoronjimana (H.A. Pilsbry, 1905) - (CLAUSILIIDAE)
- Hyperostoma, syn of: Genus Hypselostoma W.H. Benson, 1856 (HYPSELOSTOMATIDAE)
- Hyperotis, syn of: Genus Uperotus J.É. Guettard, 1770 (TEREDINIDAE)
- Hyperotus, syn of: Genus Uperotus J.É. Guettard, 1770 (TEREDINIDAE)
- hyperplatea, Theba hyperplatea G. Servain, 1880 - syn of: Theba pisana (O.F. Müller, 1774) - (HELICIDAE)
- Hyperrhytida, syn of: Subgenus Natalina (Afrorhytida) O.F. von Möllendorff, 1903 (RHYTIDIDAE)
- hyperrudis, Alvania hyperrudis J.J. Oberling, 1970 - (RISSOIDAE)
- Hyperstrophema, Genus Hyperstrophema Horný, 1964 † (ONYCHOCHILIDAE) (FOSSIL)
- hyperteleia, Plectotropis hyperteleia (L.J. Morlet, 1892) - (BRADYBAENIDAE)
- hypertropha, Coelochrysalis hypertropha E.A.L. Kittl, 1899 † - (COELOSTYLINIDAE) (FOSSIL)
- hyphala, Olivella hyphala R.S. Absalão & A. Pimenta, 2003 - (OLIVELLIDAE)
- hyphala, Odostomia hyphala R.B. Watson, 1886 - (PYRAMIDELLIDAE)
- hyphalopilema, Anadara hyphalopilema G.B. Campbell, 1962 - (ARCIDAE)
- hyphalosa, Myrtea hyphalosa Glover & J.D. Taylor, 2016 - (LUCINIDAE)
- hyphalus, Chryseofusus hyphalus (M. Smith, 1940) - (FASCIOLARIIDAE)
- hyphalus, Fusinus hyphalus M. Smith, 1940 - syn of: Chryseofusus hyphalus (M. Smith, 1940) - (FASCIOLARIIDAE)
- hyphantes, Mourlonia hyphantes (F.B. Meek, 1873 †) - (GOSSELETINIDAE) (FOSSIL)
- hyphantes, Pleurotomaria hyphantes F.B. Meek, 1873 † - syn of: Mourlonia hyphantes (F.B. Meek, 1873 †) - (PLEUROTOMARIIDAE) (FOSSIL)
- Hyphantoceras, Genus Hyphantoceras Hyatt , 1900 † (NOSTOCERATIDAE) (FOSSIL)
- Hyphantosoma, Subgenus Pitar (Hyphantosoma) W.H. Dall, 1902 (VENERIDAE)
- Hyphantozyga, Genus Hyphantozyga Knight, 1930 † (PSEUDOZYGOPLEURIDAE) (FOSSIL)
- hyphasma, Euplecta hyphasma (L. Pfeiffer, 1853) - (ARIOPHANTIDAE)
- Hyphoplites, Genus Hyphoplites Spath , 1922 † (HOPLITIDAE) (FOSSIL)
- Hypisculites, Genus Hypisculites Spath , 1951 † (EPISCULITIDAE) (FOSSIL)
- Hypnophila, Genus Hypnophila J.R. Bourguignat, 1858 (COCHLICOPIDAE)
- hypnorum, Aplexa hypnorum (C. Linnaeus, 1758) - (PHYSIDAE)
- hypnorum depressior, Physa hypnorum depressior A.T. von Middendorff, 1851 - syn of: Sibirenauta elongatus (T. Say, 1821) - (PHYSIDAE)
- hypnorum polaris, Physa hypnorum polaris C.A. Westerlund, 1876 - syn of: Sibirenauta elongatus (T. Say, 1821) - (PHYSIDAE)
- Hypoanthraconaia, Genus Hypoanthraconaia Silantiev & Urazaeva, 2017 † (NAIADITIDAE) (FOSSIL)
- Hypobrancheiaea, syn of: Genus Corambe L.S.R. Bergh, 1869 (CORAMBIDAE)
- Hypocassis, syn of: Genus Cassis J.A. Scopoli, 1777 (CASSIDAE)
- hypochlorus, Fusiconus hypochlorus (J.R. le B. Tomlin, 1937) - (CONIDAE)
- hypochra, Clausilia hypochra G. Coutagne, 1886 - syn of: Clausilia rugosa reboudii D. Dupuy, 1850 - (CLAUSILIIDAE)
- Hypocladiscites, Genus Hypocladiscites Mojsisovics , 1896 † (CLADISCITIDAE) (FOSSIL)
- hypocrita, Paralaoma hypocrita W.L.H. Dohrn, 1867 - syn of: Paralaoma servilis (R.J. Shuttleworth, 1852) - (PUNCTIDAE)
- hypocrites, Pseudovivipara hypocrites T.N. Annandale, 1918 - (BITHYNIIDAE)
- hypocrites, Discartemon hypocrites W.S.S. Van Benthem-Jutting, 1954 - (STREPTAXIDAE)
- hypocurta, Menestho hypocurta (W.H. Dall & P. Bartsch, 1909) - (PYRAMIDELLIDAE)
- hypocyrtus, Arcestes hypocyrtus Mojsisovics, 1875 † - (ARCESTIDAE) (FOSSIL)
- hypocyrtus, Anisus hypocyrtus G. Servain, 1888 - (PLANORBIDAE)
- Hypodema, Genus Hypodema Koninck, 1853 † (ARCHAEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- hypodra, Astyris hypodra (W.H. Dall, 1916) - (COLUMBELLIDAE)
- hypoeschra, Anodonta hypoeschra É.A.A. Locard, 1890 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- hypogaea, Mediterranea hypogaea J.R. Bourguignat, 1884 - syn of: Mediterranea hydatina (E.A. Rossmässler, 1838) - (OXYCHILIDAE)
- Hypogaea, syn of: Genus Pholas C. Linnaeus, 1758 (PHOLADIDAE)
- Hypogaeoderma, syn of: Genus Pholas C. Linnaeus, 1758 (PHOLADIDAE)
- Hypogella, syn of: Genus Solena O.A.L. Mörch, 1853 (SOLENIDAE)
- hypoglypta, Belidaphne hypoglypta (C.F. Fontannes, 1882 †) - (MANGELIIDAE) (FOSSIL)
- hypograpta, Ringicula hypograpta A.P. Brown & H.A. Pilsbry, 1912 - syn of: Ringicula semistriata A.V.M.D. D'Orbigny, 1842 - (RINGICULIDAE)
- hypohyalinus, Aphaostracon hypohyalinus F.G. Thompson, 1968 - (COCHLIOPIDAE)
- Hypojapelion, Genus Hypojapelion T.A. Okutani, 1968 (BUCCINIDAE)
- hypolepta, Lacteoluna hypolepta (F. Haas, 1952) - (SAGDIDAE)
- hypolia, Hirasea hypolia H.A. Pilsbry, 1907 - (ENDODONTIDAE)
- hypolispa, Turbonilla hypolispa W.H. Dall & P. Bartsch, 1909 - (PYRAMIDELLIDAE)
- hypolispa, Moerella hypolispa W.H. Dall, 1900 † - (TELLINIDAE) (FOSSIL)
- hypolispus, Latisipho hypolispus (W.H. Dall, 1891) - (BUCCINIDAE)
- hypolispus, Colus hypolispus W.H. Dall, 1891 - syn of: Latisipho hypolispus (W.H. Dall, 1891) - (BUCCINIDAE)
- hypolispus, Margarites hypolispus W.H. Dall, 1919 - syn of: Margarites vahlii (H.P.C. Møller, 1842) - (MARGARITIDAE)
- hypolius, Nassarius fraterculus hypolius (H.A. Pilsbry, 1895) - (NASSARIIDAE)
- hypolius, Solariorbis hypolius H.A. Pilsbry & A.A. Olsson, 1952 - (TORNIDAE)
- Hypolysia, Subgenus Curvella (Hypolysia) J.C. Melvill & J.H. Ponsonby, 1901 (SUBULINIDAE)
- hypolysina, Oceanida hypolysina (J.C. Melvill, 1904) - (EULIMIDAE)
- Hypoma, syn of: Genus Boysia L. Pfeiffer, 1849 (HYPSELOSTOMATIDAE)
- hypomeces, Amussium hypomeces P. Dautzenberg & H. Fischer, 1897 - syn of: Propeamussium lucidum (J.G. Jeffreys in C. Wyville-Thomson, 1873) - (PECTINIDAE)
- hypomela, Anadara hypomela (W.H. Dall, 1898 †) - (ARCIDAE) (FOSSIL)
- hypomela, Aforia hypomela (W.H. Dall, 1889) - (COCHLESPIRIDAE)
- hypomela, Irenosyrinx hypomela (W.H. Dall, 1889) - syn of: Aforia hypomela (W.H. Dall, 1889) - (COCHLESPIRIDAE)
- hypomela, Mangelia hypomela W.H. Dall, 1889 - syn of: Aforia hypomela (W.H. Dall, 1889) - (MANGELIIDAE)
- Hypomenia, Genus Hypomenia L.E.A. van Lummel, 1930 (PRUVOTINIDAE)
- Hypomphalocirrus, syn of: Genus Omphalocirrus de Ryckholt, 1860 † (OMPHALOCIRRIDAE) (FOSSIL)
- hypophaea, Fruticicola hypophaea W.A. Lindholm, 1927 - syn of: Narina hypophaea (W.A. Lindholm, 1927) - (BRADYBAENIDAE)
- hypophaea, Narina hypophaea (W.A. Lindholm, 1927) - (HYGROMIIDAE)
- Hypophiceras, Genus Hypophiceras Trümpy , 1969 † (XENODISCIDAE) (FOSSIL)
- Hypophylloceras, Genus Hypophylloceras Salfeld , 1924 † (PHYLLOCERATIDAE) (FOSSIL)
- hypopolia, Phacussa hypopolia (L. Pfeiffer, 1853) - (CHAROPIDAE)
- hypopta, Timoclea hypopta (R. Sturany, 1899) - (VENERIDAE)
- Hyporbulites, Genus Hyporbulites Breistroffer, 1947 † (NEOPHYLLOCERATIDAE) (FOSSIL)
- Hyporingicula, syn of: Genus Microglyphis W.H. Dall, 1902 (RINGICULIDAE)
- Hyposcaphites, Subgenus Otoscaphites (Hyposcaphites) Tanabe, 1977 † (SCAPHITIDAE) (FOSSIL)
- hyposculpta, Anatoma hyposculpta D.L. Geiger, 2012 - (ANATOMIDAE)
- hypostilbe, Macrochlamys hypostilbe H.A. Pilsbry & Y. Hirase, 1909 - (ARIOPHANTIDAE)
- Hypostoma, syn of: Genus Boysia L. Pfeiffer, 1849 (HYPSELOSTOMATIDAE)
- Hypostrema, syn of: Genus Boysia L. Pfeiffer, 1849 (HYPSELOSTOMATIDAE)
- Hypostrongyla, syn of: Genus Sulfurina O.F. von Möllendorff, 1893 (HELICINIDAE)
- Hypotrema, syn of: Genus Boysia L. Pfeiffer, 1849 (HYPSELOSTOMATIDAE)
- Hypotriphora, Genus Hypotriphora B.C. Cotton & F.C. Godfrey, 1931 (TRIPHORIDAE)
- Hypotrochus, syn of: Genus Plesiotrochus P. Fischer, 1878 (PLESIOTROCHIDAE)
- hypotropis, Philoxene hypotropis L. Hoffman, 1969 † - syn of: Pseudomphalotrochus gibsoni (L. Hoffman, 1969 †) - (EUOMPHALIDAE) (FOSSIL)
- hypotropis, Pseudomphalotrochus hypotropis Radabaugh, 1942 † - syn of: Pseudomphalotrochus gibsoni (L. Hoffman, 1969 †) - (OMPHALOTROCHIDAE) (FOSSIL)
- Hypoturrilites, Genus Hypoturrilites Dubourdieu , 1953 † (TURRILITIDAE) (FOSSIL)
- hypoxanthus, Unio hypoxanthus É.A.A. Locard, 1899 - syn of: Unio abrantesianus É.A.A. Locard, 1899 - (UNIONIDAE)
- Hypoxynoticeras, Genus Hypoxynoticeras Spath, 1925 † (OXYNOTICERATIDAE) (FOSSIL)
- Hypoxytoma, Genus Hypoxytoma Ichikawa, 1958 (PTERIIDA (UNASSIGNED)) (FOSSIL)
- hyppodon, Rabdotus hyppodon H.A. Pilsbry, 1897 - (BULIMULIDAE)
- hyppopus, Hippopus hyppopus C. Linnaeus, 1758 - syn of: Hippopus hippopus (C. Linnaeus, 1758) - (TRIDACNIDAE)
- hypsela, Splendrillia hypsela (R.B. Watson, 1881) - (DRILLIIDAE)
- hypsela, Melanella hypsela (A.E. Verrill & K.J. Bush, 1900) - (EULIMIDAE)
- hypsela, Eulima hypsela A.E. Verrill & K.J. Bush, 1900 - syn of: Melanella hypsela (A.E. Verrill & K.J. Bush, 1900) - (EULIMIDAE)
- hypsela, Mangelia hypsela R.B. Watson, 1881 - syn of: Splendrillia hypsela (R.B. Watson, 1881) - (MANGELIIDAE)
- hypsela, Pleurotoma hypsela R.B. Watson, 1881 - syn of: Splendrillia hypsela (R.B. Watson, 1881) - (TURRIDAE)
- Hypselartemon, Subgenus Rectartemon (Hypselartemon) W.A. Wenz, 1947 (STREPTAXIDAE)
- Hypselentoma, Genus Hypselentoma Weller , 1929 † (GOSSELETINIDAE) (FOSSIL)
- hypselia, Amphorella hypselia (H.A. Pilsbry, 1909) - (FERUSSACIIDAE)
- Hypselia, syn of: Genus Amphorella R.T. Lowe, 1852 (FERUSSACIIDAE)
- hypsellina, Trochulus hypsellina Pons in É.A.A. Locard, 1882 - syn of: Trichia hispida (C. Linnaeus, 1758) - (HYGROMIIDAE)
- hypsellus, Trophon hypsellus R. Tate, 1888 † - (MURICIDAE) (FOSSIL)
- HYPSELOCONIDAE Knight, 1956 † - Family (MONOPLACOPHORA-HYPSELOCONIDA [Order]-HYPSELOCONOIDEA [Superfamily]) (FOSSIL)
- Hypseloconus, Genus Hypseloconus Berkey , 1898 † (HYPSELOCONIDAE) (FOSSIL)
- hypselocyclum, Ataxioceras hypselocyclum (C.F. Fontannes †) - (PERISPHINCTIDAE) (FOSSIL)
- Hypselodoris, Genus Hypselodoris W. Stimpson, 1855 (CHROMODORIDIDAE)
- hypselos, Daphnellopsis hypselos R. Houart, 1995 - (MURICIDAE)
- Hypselostoma, Genus Hypselostoma W.H. Benson, 1856 (HYPSELOSTOMATIDAE)
- HYPSELOSTOMATIDAE Zilch, 1959 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-PULMONATA [Infraclass]-STYLOMMATOPHORA [Order]-PUPILLOIDEA [Superfamily])
- Hypselostyla, Subgenus Helicostyla (Hypselostyla) E.C. Von Martens, 1868 (BRADYBAENIDAE)
- hypselostyla, Helicostyla turbinoides hypselostyla W. Kobelt, 1913 - (BRADYBAENIDAE)
- hypselum, Euaspidoceras hypselum (Oppel, 1863 †) - (ASPIDOCERATIDAE) (FOSSIL)
- hypsilotera, Patella hypsilotera É.A.A. Locard, 1892 - syn of: Patella vulgata C. Linnaeus, 1758 - (PATELLIDAE)
- hypsipettus, Polygona hypsipettus (W.H. Dall, 1890 †) - (FASCIOLARIIDAE) (FOSSIL)
- Hypsipleura, Genus Hypsipleura Koken, 1892 † (ZYGOPLEURIDAE) (FOSSIL)
- hypsiprymna, Coelatura hypsiprymna (E.C. Von Martens, 1897) - (UNIONIDAE)
- Hypsobia, Genus Hypsobia P.M. Heude, 1889 (LITHOGLYPHIDAE)
- hypsocarenus, Coroceras hypsocarenus (Mojsisovics, 1875 †) - (LOBITIDAE) (FOSSIL)
- hypsocollis, Gregoia hypsocollis Fehse, 2017 - (TRIVIIDAE)
- Hypsogyra, syn of: Genus Planorbella S.S. Haldeman, 1842 (PLANORBIDAE)
- hypsomitra, Belomitra hypsomitra Y.I. Kantor, N. Puillandre, A. Rivasseau & P. Bouchet, 2012 - (BELOMITRIDAE)
- hypsus, Kleokyphus hypsus G.A. Solem, 1976 - (ENDODONTIDAE)
- Hypterita, Genus Hypterita W.P. Woodring, 1957 (NATICIDAE)
- hyptertrigona, Lycettia hyptertrigona (Damborinea, 1987 †) - (MYTILIDAE) (FOSSIL)
- Hypterus, syn of: Genus Pterotrachea P. Forsskål, 1775 (PTEROTRACHEIDAE)
- hyptiostoma, Pupina hyptiostoma J.F. Quadras & O.F. von Möllendorff, 1894 - (PUPINIDAE)
- Hyptiotheca, Genus Hyptiotheca Bengtson & al., 1990 † (HYOLITHIDA (UNASSIGNED)) (FOSSIL)
- hypula, Alopia livida hypula L. Soós, 1928 - (CLAUSILIIDAE)
- Hyrcania, Genus Hyrcania Monterosato, 1894 † (BIVALVIA INCERTAE SEDIS) (FOSSIL)
- Hyrcania, syn of: Genus Pomatias S.E. Studer, 1789 (POMATIIDAE)
- hyrcanica, Laeviphaedusa hyrcanica (J. Germain, 1933) - (CLAUSILIIDAE)
- Hyrcanites, Genus Hyrcanites Shevyrev, 1968 † (BYRRANGOCERATIDAE) (FOSSIL)
- Hyrcanolestes, Genus Hyrcanolestes H.R. Simroth, 1901 (TRIGONOCHLAMYDIDAE)
- hyrcanum, Pomatias hyrcanum (E.C. Von Martens, 1874) - (POMATIIDAE)
- hyrcanus, Buliminus hyrcanus W.A. Lindholm, 1915 - syn of: Akramovskiella umbrosa (A. Mousson, 1873) - (ENIDAE)
- Hyria, syn of: Genus Prisodon H.C.F. Schumacher, 1817 (HYRIIDAE)
- Hyriana, syn of: Genus Prisodon H.C.F. Schumacher, 1817 (HYRIIDAE)
- Hyridella, Genus Hyridella W.J. Swainson, 1840 (HYRIIDAE)
- Hyridunio, syn of: Genus Velesunio T. Iredale, 1934 (HYRIIDAE)
- hyrie, Tryblidium hyrie (Billings, 1865 †) - (TRYBLIDIIDAE) (FOSSIL)
- HYRIIDAE Swainson, 1840 - Family (BIVALVIA-PALAEOHETERODONTA [Subclass]-UNIONIDA [Order]-HYRIOIDEA [Superfamily])
- hyrioides, Anodontites hyrioides A.E. Ortmann, 1921 - syn of: Anodontites trigona (J.B. von Spix & J.A. Wagner, 1827) - (MYCETOPODIDAE)
- Hyriopsis, Genus Hyriopsis T.A. Conrad, 1853 (UNIONIDAE)
- Hyris, syn of: Genus Prisodon H.C.F. Schumacher, 1817 (HYRIIDAE)
- hysginodes, Pecten hysginodes J.C. Melvill, 1888 - syn of: Cryptopecten vesiculosus (R.W. Dunker, 1877) - (PECTINIDAE)
- hyshugari, Conus hyshugari E.J. Petuch, 1994 † - (CONIDAE) (FOSSIL)
- hyshugari, Hystrivasum hyshugari E.J. Petuch, 1994 † - (TURBINELLIDAE) (FOSSIL)
- hysteraulax, Gadila hysteraulax V. Scarabino, 2008 - (GADILIDAE)
- hysterea, Calliotropis hysterea C. Vilvens, 2007 - (CALLIOTROPIDAE)
- hysterica, Hippocardia hysterica (von Schlotheim, 1820 †) - (HIPPOCARDIIDAE) (FOSSIL)
- hystericum, Conocardium hystericum von Schlotheim, 1820 † - syn of: Hippocardia hydei Hoare, 1990 † - (CONOCARDIIDAE) (FOSSIL)
- hystericus, Cardium hystericus von Schlotheim, 1820 † - (CARDIIDAE) (FOSSIL)
- Hysteroceras, Genus Hysteroceras Hyatt , 1900 † (BRANCOCERATIDAE) (FOSSIL)
- Hysteroconcha, Subgenus Pitar (Hysteroconcha) W.H. Dall, 1902 (VENERIDAE)
- hystricella, Cookeconcha hystricella (L. Pfeiffer, 1859) - (ENDODONTIDAE)
- hystricella, Helix hystricella L. Pfeiffer - syn of: Cookeconcha hystricella (L. Pfeiffer, 1859) - (HELICIDAE)
- Hystricella, Subgenus Discula (Hystricella) R.T. Lowe, 1854 (HYGROMIIDAE)
- Hystricella, syn of: Genus Geomitra W.J. Swainson, 1840 (HYGROMIIDAE)
- hystricella, Negulus hystricella C.M. Cooke & H.A. Pilsbry, 1920 - (VERTIGINIDAE)
- hystricella paucilamellata, Cookeconcha hystricella paucilamellata (C.M.F. Ancey, 1904) - (ENDODONTIDAE)
- hystricelloides, Thaumatodon hystricelloides (A. Mousson, 1865) - (ENDODONTIDAE)
- hystricina, Paziella hystricina (W.H. Dall, 1889) - (MURICIDAE)
- hystricina, Phyllonotus hystricina W.H. Dall, 1889 - syn of: Paziella hystricina (W.H. Dall, 1889) - (MURICIDAE)
- hystricina, Bouchetia hystricina W.H. Dall, 1889 - syn of: Paziella hystricina (W.H. Dall, 1889) - (MURICIDAE)
- hystricina, Onchidoris hystricina (L.S.R. Bergh, 1878) - (ONCHIDORIDIDAE)
- Hystricoceras, Genus Hystricoceras Jahn, 1894 † (EUOMPHALIDAE) (FOSSIL)
- hystricosus, Craspedochiton hystricosus P. Kaas, 1991 - (ACANTHOCHITONIDAE)
- hystricosus, Murex hystricosus R. Houart & B. Dharma, 2001 - (MURICIDAE)
- hystriculum, Helicoceras hystriculum White, 1887 † - (NOSTOCERATIDAE) (FOSSIL)
- hystriculum, Columbarium hystriculum T.A. Darragh, 1987 - (TURBINELLIDAE)
- Hystrionica, syn of: Genus Cepaea F. Held, 1837 (HELICIDAE)
- Hystrivasum, Subgenus Vasum (Hystrivasum) Olsson & Petit, 1964 † (TURBINELLIDAE) (FOSSIL)
- hystrix, Aeolidia hystrix B.C. Otto, 1823 - (AEOLIDIIDAE)
- hystrix, Spurilla hystrix A. Risso, 1826 - syn of: Spurilla neapolitana (S. Delle Chiaje, 1841) - (AEOLIDIIDAE)
- hystrix, Ammonites hystrix J. Phillips, 1829 † - syn of: Distoloceras hystrix (J. Phillips, 1829 †) - (AMMONITIDA (unassigned)) (FOSSIL)
- hystrix, Calyptraea hystrix W.J. Broderip, 1834 - syn of: Bostrycapulus aculeatus (J.F. Gmelin, 1791) - (CALYPTRAEIDAE)
- hystrix, Scalptia hystrix (L.A. Reeve, 1856) - (CANCELLARIIDAE)
- hystrix, Cardium hystrix J. Lightfoot, 1786 - syn of: Acanthocardia echinata (C. Linnaeus, 1758) - (CARDIIDAE)
- hystrix, Ctenocardia hystrix L.A. Reeve, 1844 - syn of: Ctenocardia virgo (L.A. Reeve, 1845) - (CARDIIDAE)
- hystrix, Cerithium hystrix Eudes-Deslongchamps, 1842 † - syn of: Pseudocerithium hystrix (Eudes-Deslongchamps, 1842 †) - (CERITHIIDAE) (FOSSIL)
- hystrix, Pseudocerithium hystrix (Eudes-Deslongchamps, 1842 †) - (CRYPTAULACIDAE) (FOSSIL)
- hystrix, Doto hystrix B.E. Picton & G.H. Brown, 1981 - (DOTIDAE)
- hystrix, Cookeconcha hystrix (L. Pfeiffer, 1846) - (ENDODONTIDAE)
- hystrix, Pyramidelloides hystrix S.M. Souverbie, 1877 - syn of: Pyramidelloides mirandus (A. Adams, 1861) - (EULIMIDAE)
- hystrix, Helix hystrix J.W. Mighels - syn of: Cookeconcha hystrix (L. Pfeiffer, 1846) - (HELICIDAE)
- hystrix, Lepidomenia hystrix A. Marion & A. Kowalevsky, 1886 - (LEPIDOMENIIDAE)
- hystrix, Ziba hystrix R.P. Montrouzier, 1862 - syn of: Ziba verrucosa (L.A. Reeve, 1845) - (MITRIDAE)
- hystrix, Calotrophon hystrix E.F. Garcia, 2006 - (MURICIDAE)
- hystrix, Murex hystrix J.H.F. Link, 1807 - syn of: Drupa rubusidaeus P.F. Röding, 1798 - (MURICIDAE)
- hystrix, Murex hystrix C. Linnaeus, 1758 - syn of: Drupa ricinus (C. Linnaeus, 1758) - (MURICIDAE)
- hystrix, Drupa hystrix C. Linnaeus, 1758 - syn of: Drupa ricinus (C. Linnaeus, 1758) - (MURICIDAE)
- hystrix, Purpura hystrix C. Linnaeus, 1758 - syn of: Drupa ricinus (C. Linnaeus, 1758) - (MURICIDAE)
- hystrix, Distoloceras hystrix (J. Phillips, 1829 †) - (NEOCOMITIDAE) (FOSSIL)
- hystrix, Atrina hystrix S.C.T. Hanley, 1858 - (PINNIDAE)
- hystrix, Xenopoma hystrix (B.H. Wright in L. Pfeiffer, 1862) - (POMATIIDAE)
- hystrix, Choanopoma hystrix B.H. Wright in L. Pfeiffer, 1862 - syn of: Xenopoma hystrix (B.H. Wright in L. Pfeiffer, 1862) - (POMATIIDAE)
- hystrix, Niteomica hystrix A.H. Scheltema & D. Ivanov, 2000 - (PROCHAETODERMATIDAE)
- hystrix, Rissoina hystrix S.M. Souverbie, 1877 - syn of: Pyramidelloides mirandus (A. Adams, 1861) - (RISSOINIDAE)
- hystrix, Spondylus hystrix L.A. Reeve, 1856 - syn of: Spondylus virgineus L.A. Reeve, 1856 - (SPONDYLIDAE)
- hystrix, Spondylus hystrix P.F. Röding, 1798 - syn of: Spondylus nicobaricus K. Schreibers, 1793 - (SPONDYLIDAE)
- hystrix, Spondylus nicobaricus hystrix J.F. Bolten in P.F. Röding, 1798 - (SPONDYLIDAE)
- hystrix, Tubina hystrix J. Perner, 1903 † - (TUBINIDAE) (FOSSIL)
- hystrix, Pleurotoma hystrix G. Jan in L.M.D. Bellardi, 1847 † - syn of: Raphitoma histrix (G. Jan in L.M.D. Bellardi, 1847 †) - (TURRIDAE) (FOSSIL)
- hythense, Epancyloceras hythense Spath, 1930 † - (ANCYLOCERATIDAE) (FOSSIL)
- hythensis, Resatrix hythensis R. Casey, 1952 † - (VENERIDAE) (FOSSIL)
- hyugaensis, Agapella hyugaensis Tashiro & M. Tanaka, 1993 † - (ARCTICIDAE) (FOSSIL)
- hyugaensis, Amussiopecten hyugaensis T. Shuto, 1955 † - syn of: Amussiopecten iitomiensis Y. Otuka, 1934 † - (PECTINIDAE) (FOSSIL)
- hyugaensis, Turris hyugaensis T. Shuto, 1961 - (TURRIDAE)
- hyugana, Euhadra herklotsi hyugana J.T. Kuroda, 1936 - (BRADYBAENIDAE)
- hyugana, Clathrodrillia hyugana (M. Yokoyama, 1928 †) - (DRILLIIDAE) (FOSSIL)
- hyugana, Drillia hyugana M. Yokoyama, 1928 † - syn of: Clathrodrillia hyugana (M. Yokoyama, 1928 †) - (DRILLIIDAE) (FOSSIL)
- hyznyi, Cerastua hyznyi M. Harzhauser & T.A. Neubauer, 2015 † - (CERASTUIDAE) (FOSSIL)
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