- qaganqulutensis, Crenipecten qaganqulutensis X.L. Liang, 1980 † - (AVICULOPECTINIDAE) (FOSSIL)
- qenenoji, Turbolidium qenenoji (A. Peñas & E. Rolán, 2010) - (PYRAMIDELLIDAE)
- qeratensis, Coecella qeratensis S. Morris & N.J. Morris, 1993 - (MESODESMATIDAE)
- qianensis, Paludomus qianensis H.X. Liu, Y.H. Duan & Zhang, 1994 - (PALUDOMIDAE)
- qianjiangense, Huananoceras qianjiangense J.K. Zhao & al., 1978 † - (HUANANOCERATIDAE) (FOSSIL)
- qianjiangensis, Pseudotirolites qianjiangensis J.K. Zhao & al., 1978 † - (PSEUDOTIROLITIDAE) (FOSSIL)
- Qianjiangoceras, Genus Qianjiangoceras Zhao & al., 1978 † (PLEURONODOCERATIDAE) (FOSSIL)
- Qiannanites, Genus Qiannanites Ruan, 1981 † (PRODROMITIDAE) (FOSSIL)
- qianshanense, Huaiheceras qianshanense Zou & C. Chen, 1979 † - (ELLESMEROCERIDA (UNASSIGNED)) (FOSSIL)
- qiaoluotuensis, Palaeomutela qiaoluotuensis Liang † - (PALAEOMUTELIDAE) (FOSSIL)
- qii, Petraeomastus qii S.Y. Wang & Min Wu, 2013 - (ENIDAE)
- qingdaonensis, Petalifera qingdaonensis G.Y. Lin, 1990 - (APLYSIIDAE)
- qinghaianus, Trachyornites qinghaianus Wang & C. Chen, 1979 † - (BEYRICHITIDAE) (FOSSIL)
- qinghaianus, Pleuronautilus qinghaianus Wang & C. Chen, 1979 † - (TAINOCERATIDAE) (FOSSIL)
- qinghaiense, Paracrochordiceras qinghaiense Wang & C. Chen, 1979 † - (ACROCHORDICERATIDAE) (FOSSIL)
- qinghaiense, Svalbardiceras qinghaiense Wang & C. Chen, 1979 † - (SIBIRITIDAE) (FOSSIL)
- qinghaiensis, Aviculopecten qinghaiensis C.C. Lu, 1986 † - (AVICULOPECTINIDAE) (FOSSIL)
- qinghaiensis, Gervillella qinghaiensis Wen, 1979 † - (BAKEVELLIIDAE) (FOSSIL)
- qinghaiensis, Protocardia qinghaiensis Wen, 1979 † - (CARDIIDAE) (FOSSIL)
- qinghaiensis, Lenotropites qinghaiensis Wang & C. Chen, 1979 † - (LONGOBARDITIDAE) (FOSSIL)
- qinghaiensis, Palaeomutela qinghaiensis C.C. Lu, 1986 † - (PALAEOMUTELIDAE) (FOSSIL)
- qinghaiensis, Parallelodon qinghaiensis H.X. Liu, 1976 † - (PARALLELODONTIDAE) (FOSSIL)
- qinghaiensis, Pholadomya qinghaiensis Wen, 1979 † - (PHOLADOMYIDAE) (FOSSIL)
- qinghaiensis, Pinna qinghaiensis C.C. Lu, 1986 † - (PINNIDAE) (FOSSIL)
- qinghaiensis, Prohungarites qinghaiensis Wang & C. Chen, 1979 † - (SIBIRITIDAE) (FOSSIL)
- qinglongensis, Actinodontophora qinglongensis F.S. Xu & T.C. Lan, 1980 † - syn of: Actinodontophora katsurensis M. Ichikawa, 1951 † - (ACTINODONTOPHORIDAE) (FOSSIL)
- qinglongensis, Bakevellia qinglongensis F.S. Xu, 1976 † - (BAKEVELLIIDAE) (FOSSIL)
- qinglongensis, Bucanopsis qinglongensis Wang, 1980 † - (BELLEROPHONTIDAE) (FOSSIL)
- qinglongensis, Bellerophon qinglongensis Wang, 1980 † - (BELLEROPHONTIDAE) (FOSSIL)
- qinglongensis, Callistadia qinglongensis Pan, 1985 † - (GOSSELETINIDAE) (FOSSIL)
- qinglongensis, Tylonautilus qinglongensis Zheng, 1984 † - (GZHELOCERATIDAE) (FOSSIL)
- qinglongensis, Palaeoneilo qinglongensis Wen & F.S. Xu, 1980 † - syn of: Palaeoneilo yongdingensis Li & Ding, 1982 † - (MALLETIIDAE) (FOSSIL)
- qinglongensis, Pseudomonotis qinglongensis F.S. Xu, 1976 † - (PSEUDOMONOTIDAE) (FOSSIL)
- qinglongensis, Pseudotirolites qinglongensis Zheng, 1981 † - (PSEUDOTIROLITIDAE) (FOSSIL)
- qinglongensis, Schizodus qinglongensis F.S. Xu, 1980 † - syn of: Schizodus xiangtanensis Y. Fang, 1987 † - (SCHIZODIDAE) (FOSSIL)
- Qinglongites, Genus Qinglongites Zheng , 1981 † (PSEUDOHALORITIDAE) (FOSSIL)
- qinglongshanensis, Quenstedtia qinglongshanensis Li & Yu, 1982 † - (QUENSTEDTIIDAE) (FOSSIL)
- qingshuiheensis, Retispira qingshuiheensis H. Guo, 1983 † - (KNIGHTITIDAE) (FOSSIL)
- qingshuihensis, Retispira qingshuihensis H. Guo, 1983 † - (KNIGHTITIDAE) (FOSSIL)
- qingyanensis, Euomphalus qingyanensis Yin & E.L. Yochelson, 1983 † - (EUOMPHALIDAE) (FOSSIL)
- qingyanensis, Myoconcha qingyanensis C. Chen, 1976 † - (KALENTERIDAE) (FOSSIL)
- qingyanensis, Worthenia qingyanensis Yu & al., 1974 † - syn of: Wortheniella qingyanensis (Yu & al., 1974 †) - (LOPHOSPIRIDAE) (FOSSIL)
- qingyanensis, Palaeonucula qingyanensis C. Chen, 1976 † - (NUCULIDAE) (FOSSIL)
- qingyanensis, Wortheniella qingyanensis (Yu & al., 1974 †) - (WORTHENIELLIDAE) (FOSSIL)
- qingyanensis, Zygites qingyanensis Yu & al., 1974 † - (ZYGITIDAE) (FOSSIL)
- Qingyaniola, Genus Qingyaniola Stiller & Chen, 2006 † (MYSIDIELLIDAE) (FOSSIL)
- qingyuani, Sinanodonta qingyuani He & Z. Zhuang, 2013 - (UNIONIDAE)
- qingzhenense, Neostenopoceras qingzhenense J.K. Zhao & al., 1978 † - (GRYPOCERATIDAE) (FOSSIL)
- qingzhouensis, Myophoriopis qingzhouensis Anis † - (MYOPHORICARDIIDAE) (FOSSIL)
- qinzhouensis, Palaeoneilo qinzhouensis He & al., 2007 † - syn of: Palaeoneilo shaoyangensis Y. Fang, 1987 † - (MALLETIIDAE) (FOSSIL)
- qionghaiensis, Sinotaia qionghaiensis Z.X. Qian, Y. Fang & J. He, 2014 - (VIVIPARIDAE)
- Qiongzhounia, Genus Qiongzhounia Lan, 1983 † (NUCULANIDAE) (FOSSIL)
- Qiushougouceras, Genus Qiushougouceras † (ELLESMEROCERIDA (UNASSIGNED)) (FOSSIL)
- qiushugouense, Physalactinoceras qiushugouense C. Chen & Teichert, 1983 † - (PROTACTINOCERATIDAE) (FOSSIL)
- Qiyangia, Genus Qiyangia C. Chen & F.S. Xu, 1980 (UNIONIDAE)
- qizhongyani, Natica qizhongyani X.T. Ma & S.P. Zhang, 1994 - (NATICIDAE)
- qiziqiaoensis, Viriatella qiziqiaoensis B.Z. Li, 1987 † - (VIRIATELLIDAE) (FOSSIL)
- quaasi, Graciliala quaasi S. Kiel & K. Bandel, 2002 † - (APORRHAIDAE) (FOSSIL)
- quaasi, Choffaticeras quaasi Solger, 1903 † - syn of: Choffaticeras segne Solger, 1903 † - (PSEUDOTISSOTIIDAE) (FOSSIL)
- quaasi, Tarturia quaasi Strougo 1983 † - (PTERIIDA (UNASSIGNED)) (FOSSIL)
- quaasi, Schloenbachia quaasi Peron in Fourtau, 1904 † - syn of: Choffaticeras segne Solger, 1903 † - (SCHLOENBACHIIDAE) (FOSSIL)
- quadalensis, Patagonicardium quadalensis D. Frassinetti & Covacevich, 1999 † - (CARDIIDAE) (FOSSIL)
- quadingensis, Prestonella quadingensis M. Connolly, 1929 - (BOTHRIEMBRYONTIDAE)
- quadra, Obesotoma quadra W.H. Dall, 1919 - syn of: Obesotoma solida (W.H. Dall, 1887) - (MANGELIIDAE)
- quadra, Pholadidea quadra (G.B. I Sowerby, 1834) - (PHOLADIDAE)
- quadra, Hatasia quadra (G.B. I Sowerby, 1834) - syn of: Pholadidea quadra (G.B. I Sowerby, 1834) - (PHOLADIDAE)
- quadracarinata, Gonioviriatellina quadracarinata Ruan & Mu, 1989 † - (GONIONOWAKIIDAE) (FOSSIL)
- quadrae, Spiromoelleria quadrae (W.H. Dall, 1897) - (COLLONIIDAE)
- quadrae, Moelleria quadrae W.H. Dall, 1897 - syn of: Spiromoelleria quadrae (W.H. Dall, 1897) - (COLLONIIDAE)
- quadrae, Odostomia quadrae W.H. Dall & P. Bartsch, 1910 - (PYRAMIDELLIDAE)
- quadragenarium, Dallocardia quadragenarium (T.A. Conrad, 1837) - (CARDIIDAE)
- quadralirata, Pyramimitra quadralirata D.T. Dockery, 1977 † - (PYRAMIMITRIDAE) (FOSSIL)
- quadrana, Macoma quadrana W.H. Dall, 1916 - syn of: Macoma carlottensis J.J.F. Whiteaves, 1880 - (TELLINIDAE)
- quadrangula, Paramytilarca quadrangula Isberg, 1934 † - (AMBONYCHIIDAE) (FOSSIL)
- quadrangula, Placuna quadrangula L. Philipsson, 1788 - syn of: Placuna ephippium (L. Philipsson, 1788) - (PLACUNIDAE)
- quadrangula, Tetragonocyclas quadrangula Y.I. Starobogatov & L.L. Budnikova, 1985 - syn of: Pisidium milium F. Held, 1836 - (SPHAERIIDAE)
- quadrangulare, Dentalium quadrangulare G.B. I Sowerby, 1832 - syn of: Tesseracme quadrangularis (G.B. I Sowerby in W.J. Broderip & G.B. I Sowerby, 1832) - (DENTALIIDAE)
- quadrangulare, Visitator quadrangulare Dunbar, 1920 † - syn of: Visitator tennesseensis (Dunbar, 1920 †) - (PLATYCERATIDAE) (FOSSIL)
- quadrangularis, Glans quadrangularis T.A. Okutani, 2005 - syn of: Centrocardita millegrana (S. Nomura & N. Zinbo, 1934) - (CARDITIDAE)
- quadrangularis, Cenoceras quadrangularis (Pia, 1914 †) - (CENOCERATIDAE) (FOSSIL)
- quadrangularis, Pseudotritonia quadrangularis K.H.J. Thiele, 1912 - (CHARCOTIIDAE)
- quadrangularis, Cyrtodontula quadrangularis R.P. Whitfield † - (CYRTODONTIDAE) (FOSSIL)
- quadrangularis, Whitella quadrangularis R.P. Whitfield † - syn of: Cyrtodontula quadrangularis R.P. Whitfield † - (CYRTODONTIDAE) (FOSSIL)
- quadrangularis, Tesseracme quadrangularis (G.B. I Sowerby in W.J. Broderip & G.B. I Sowerby, 1832) - (DENTALIIDAE)
- quadrangularis, Entalina quadrangularis M. Boissevain, 1906 - (ENTALINIDAE)
- quadrangularis, Lima pecosensis quadrangularis Stanton, 1947 † - (LIMIDAE) (FOSSIL)
- quadrangularis, Megaxinus quadrangularis R. von Cosel & P. Bouchet, 2008 - (LUCINIDAE)
- quadrangularis, Mactra quadrangularis L.A. Reeve, 1854 - (MACTRIDAE)
- quadrangularis, Septimyalina quadrangularis Newell, 1942 † - (MYALINIDAE) (FOSSIL)
- quadrangularis, Perna quadrangularis L.A. Reeve, 1858 - syn of: Isognomon nucleus (J.B.P.A. Lamarck, 1819) - (MYTILIDAE)
- quadrangularis, Nautilus quadrangularis Pia, 1914 † - syn of: Cenoceras quadrangularis (Pia, 1914 †) - (NAUTILIDAE) (FOSSIL)
- quadrangularis, Neilonella quadrangularis (W.H. Dall, 1881) - (NEILONELLIDAE)
- quadrangularis, Nuculana quadrangularis W.H. Dall, 1881 - syn of: Neilonella quadrangularis (W.H. Dall, 1881) - (NUCULANIDAE)
- quadrangularis, Orthonychia quadrangularis Whidborne, 1891 † - (ORTHONYCHIIDAE) (FOSSIL)
- quadrangularis, Isognomon quadrangularis L.A. Reeve, 1858 - syn of: Isognomon nucleus (J.B.P.A. Lamarck, 1819) - (PTERIIDAE)
- quadrangularis, Nausitora quadrangularis P.B. Sivickis, 1928 - syn of: Nausitora dunlopei (B.H. Wright, 1864) - (TEREDINIDAE)
- quadrangularis, Bankia quadrangularis P.B. Sivickis, 1928 - syn of: Nausitora dunlopei (B.H. Wright, 1864) - (TEREDINIDAE)
- quadrangularis, Solariorbis quadrangularis † - (TORNIDAE) (FOSSIL)
- quadrangularis, Samarangia quadrangularis (A. Adams & L.A. Reeve, 1850) - (VENERIDAE)
- quadrangularis, Haliris quadrangularis (T.H. Aldrich, 1903 †) - (VERTICORDIIDAE) (FOSSIL)
- quadrangularis veneriformis, Mactra quadrangularis veneriformis G.P. Deshayes in L.A. Reeve, 1854 - (MACTRIDAE)
- quadrangulata, Ambonychinia quadrangulata Isberg, 1934 † - (AMBONYCHIIDAE) (FOSSIL)
- quadrangulata, Doris quadrangulata J.G. Jeffreys, 1869 - syn of: Acanthodoris pilosa (P.C. Abildgaard in O.F. Müller, 1789) - (DORIDIDAE)
- quadrangulata, Favartia quadrangulata A.E.M. Cossmann & M.A. Peyrot, 1919 † - syn of: Favartia excisa (J.P.S. Grateloup, 1833 †) - (MURICIDAE) (FOSSIL)
- quadrangulata, Acanthodoris quadrangulata J.G. Jeffreys, 1869 - syn of: Acanthodoris pilosa (P.C. Abildgaard in O.F. Müller, 1789) - (ONCHIDORIDIDAE)
- quadrangulata, Turritella quadrangulata Klipstein, 1843 † - syn of: Promathildia colon (Münster, 1841 †) - (TURRITELLIDAE) (FOSSIL)
- quadrangulata, Anodonta quadrangulata G. Servain, 1888 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- quadrangulatum, Cerithium quadrangulatum Klipstein, 1843 † - syn of: Promathildia subcancellata (Münster, 1841 †) - (CERITHIIDAE) (FOSSIL)
- quadrangulonodosa, Turritella quadrangulonodosa Klipstein, 1843 † - (TURRITELLIDAE) (FOSSIL)
- quadrangulonodulosus, Trochus quadrangulonodulosus Klipstein, 1843 † - (TROCHIDAE) (FOSSIL)
- quadrangulonodulosus, Turbo quadrangulonodulosus Klipstein, 1843 † - syn of: Collonia reflexa (Münster, 1841 †) - (TURBINIDAE) (FOSSIL)
- quadrangulosus, Unio quadrangulosus P.M. Heude, 1881 - syn of: Lamprotula caveata (P.M. Heude, 1877) - (UNIONIDAE)
- quadrangulus, Gyraulus quadrangulus (M. von Neumayr, 1875 †) - (PLANORBIDAE) (FOSSIL)
- quadrangulus, Metatirolites quadrangulus (J. Von Hauer, 1860 †) - (USSURITIDAE) (FOSSIL)
- quadrangulus, Vermetus quadrangulus R.A. Philippi, 1848 - syn of: Vermicularia spirata R.A. Philippi, 1836 - (VERMETIDAE)
- quadrangulus bassarabicus, Gyraulus quadrangulus bassarabicus Macarovici, 1940 † - (PLANORBIDAE) (FOSSIL)
- quadrangulus complanatus, Gyraulus quadrangulus complanatus E. Jekelius, 1932 † - (PLANORBIDAE) (FOSSIL)
- quadrangulus tectus, Gyraulus quadrangulus tectus E. Jekelius, 1932 † - (PLANORBIDAE) (FOSSIL)
- quadrans, Astarte quadrans Gould, 1841 - syn of: Astarte crebrilirata G.B. II Sowerby, 1854 - (ASTARTIDAE)
- quadrans, Conocardium quadrans Barrande, 1881 † - syn of: Bohemicardia bohemica (Barrande, 1881 †) - (CONOCARDIIDAE) (FOSSIL)
- Quadrans, Genus Quadrans V. Bertin, 1878 (TELLINIDAE)
- quadrans, Unio quadrans I. Lea, 1860 - syn of: Diplodon fontainianus (A.V.M.D. D'Orbigny, 1835) - (UNIONIDAE)
- quadrapicalis, Tesseracme quadrapicalis (S.C.T. Hanley in G.B. Sowerby, 1860) - (DENTALIIDAE)
- quadrarium, Cerastoderma quadrarium L.A. Reeve, 1845 - syn of: Cerastoderma edule (C. Linnaeus, 1758) - (CARDIIDAE)
- quadrarium, Cardioceras quadrarium Buckman, 1926 † - (CARDIOCERATIDAE) (FOSSIL)
- quadrarium, Cheloniceras quadrarium Casey † - (DOUVILLEICERATIDAE) (FOSSIL)
- quadrarmatum, Tetraspidoceras quadrarmatum (Dumortier, 1867 †) - (COELOCERATIDAE) (FOSSIL)
- quadrasi, Elasmias quadrasi (O.F. von Möllendorff, 1894) - (ACHATINELLIDAE)
- quadrasi, Amphibola quadrasi O.F. von Möllendorff, 1894 - (AMPHIBOLIDAE)
- quadrasi, Pila quadrasi W. Kobelt, 1911 - syn of: Pila conica Gray, 1840 - (AMPULLARIIDAE)
- quadrasi, Omphalotropis quadrasi (O.F. von Möllendorff, 1894) - (ASSIMINEIDAE)
- quadrasi, Helicostyla simplex quadrasi J.G. Hidalgo, 1886 - (BRADYBAENIDAE)
- quadrasi, Amphidromus quadrasi J.G. Hidalgo, 1887 - (CAMAENIDAE)
- quadrasi, Himeroconcha quadrasi (O.F. von Möllendorff, 1894) - (CHAROPIDAE)
- quadrasi, Ryssota quadrasi J.G. Hidalgo, 1866 - (CHRONIDAE)
- quadrasi, Opisthoporus quadrasi (J.G. Hidalgo, 1888) - (CYCLOPHORIDAE)
- quadrasi, Palaina quadrasi (O.F. von Möllendorff, 1887) - (DIPLOMMATINIDAE)
- quadrasi, Drillia quadrasi O. Böttger, 1895 - (DRILLIIDAE)
- quadrasi, Blauneria quadrasi O.F. von Möllendorff, 1895 - (ELLOBIIDAE)
- quadrasi, Stilifer quadrasi O. Böttger, 1893 - syn of: Eulima variabilis O. Böttger, 1893 - (EULIMIDAE)
- quadrasi, Helix quadrasi J.G. Hidalgo, 1887 - (HELICIDAE)
- quadrasi, Ceratopoma quadrasi (O.F. von Möllendorff, 1896) - (HELICINIDAE)
- quadrasi, Atenia quadrasi (J.G. Hidalgo, 1875) - (HELICODONTIDAE)
- quadrasi, Iravadia quadrasi (O. Böttger, 1893) - (IRAVADIIDAE)
- quadrasi, Fairbankia quadrasi O. Böttger, 1893 - syn of: Iravadia bombayana (F. Stoliczka, 1868) - (IRAVADIIDAE)
- quadrasi, Radix quadrasi (O.F. von Möllendorff) - (LYMNAEIDAE)
- quadrasi, Gingicithara quadrasi O. Böttger, 1895 - syn of: Gingicithara notabilis (E.A. Smith, 1888) - (MANGELIIDAE)
- quadrasi, Nassarius quadrasi (J.G. Hidalgo, 1904) - (NASSARIIDAE)
- quadrasi, Oncomelania hupensis quadrasi O.F. von Möllendorff, 1895 - (POMATIOPSIDAE)
- quadrasi, Cerithidea scalariformis quadrasi W. Kobelt, 1898 - (POTAMIDIDAE)
- quadrasi, Eulimella quadrasi O. Böttger, 1893 - (PYRAMIDELLIDAE)
- quadrasi, Alvania quadrasi O. Böttger, 1893 - syn of: Iravadia quadrasi (O. Böttger, 1893) - (RISSOIDAE)
- quadrasi, Onoba quadrasi O. Böttger, 1893 - syn of: Iravadia densilabrum (J.C. Melvill, 1912) - (RISSOIDAE)
- quadrasi, Stenothyra quadrasi O.F. von Möllendorff, 1895 - (STENOTHYRIDAE)
- quadrasi, Enteroplax quadrasi O.F. von Möllendorff - (STROBILOPSIDAE)
- quadrasi, Curvella quadrasi (O.F. von Möllendorff) - (SUBULINIDAE)
- quadrasi, Succinea quadrasi Unknown - (SUCCINEIDAE)
- quadrasi, Monodonta quadrasi G.B. III Sowerby, 1898 - syn of: Austrocochlea tricingulata (A. Adams, 1853) - (TROCHIDAE)
- quadrasi, Truncatella quadrasi O.F. von Möllendorff, 1893 - (TRUNCATELLIDAE)
- quadrasi, Petricola quadrasi (J.G. Hidalgo, 1886) - (VENERIDAE)
- quadrasi, Venerupis quadrasi J.G. Hidalgo, 1886 - syn of: Petricola quadrasi (J.G. Hidalgo, 1886) - (VENERIDAE)
- quadrasi, Nesopupa quadrasi (O.F. von Möllendorff, 1894) - (VERTIGINIDAE)
- quadrasi aborlanensis, Amphidromus quadrasi aborlanensis P. Bartsch, 1946 - (CAMAENIDAE)
- quadrasi alba, Nassa quadrasi alba J.G. Hidalgo, 1904 - syn of: Nassarius echinatus (A. Adams, 1852) - (NASSARIIDAE)
- quadrasi dubius, Amphidromus quadrasi dubius H.C. Fulton, 1896 - (CAMAENIDAE)
- quadrasi everetti, Amphidromus quadrasi everetti H.C. Fulton, 1896 - syn of: Amphidromus everetti H.C. Fulton, 1896 - (CAMAENIDAE)
- quadrasi lindstedti, Amphidromus quadrasi lindstedti (L. Pfeiffer, 1856) - (CAMAENIDAE)
- quadrasi palawanensis, Amphidromus quadrasi palawanensis P. Bartsch, 1917 - (CAMAENIDAE)
- quadrasi palawanensis, Opisthoporus quadrasi palawanensis (J.G. Hidalgo, 1888) - (CYCLOPHORIDAE)
- quadrasi solidus, Amphidromus quadrasi solidus H.C. Fulton, 1896 - (CAMAENIDAE)
- quadrasi versicolor, Amphidromus quadrasi versicolor (H.C. Fulton, 1896) - (CAMAENIDAE)
- Quadrasia, syn of: Genus Clea H. Adams, 1855 (BUCCINIDAE)
- Quadrasiella, Genus Quadrasiella O.F. von Möllendorff, 1894 (ASSIMINEIDAE)
- quadrata, Chelidonura quadrata J.A. Ortea, G.M. Caballer & J. Espinosa, 2014 - (AGLAJIDAE)
- quadrata, Ambonychinia quadrata (Hind, 1910 †) - (AMBONYCHIIDAE) (FOSSIL)
- quadrata, Trachynerita quadrata Stoppani, 1858 † - (ARCHAEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- quadrata, Antiquicyprina trapezoidalis quadrata Wen, 1979 † - (ARCTICIDAE) (FOSSIL)
- quadrata, Astartella quadrata H.X. Liu, 1976 † - (ASTARTIDAE) (FOSSIL)
- quadrata, Permartella quadrata Yancey, 1985 † - (ASTARTIDAE) (FOSSIL)
- quadrata, Trabeculatia quadrata (Lutkevich & Lobanova, 1970 †) - (ATOMODESMATIDAE) (FOSSIL)
- quadrata, Basterotia quadrata (R.B. Hinds, 1843) - (BASTEROTIIDAE)
- quadrata, Gonioteuthis quadrata (H.M.D. de Blainville, 1827 †) - (BELEMNITIDA (UNASSIGNED)) (FOSSIL)
- quadrata, Cancellaria quadrata J. de C. Sowerby, 1822 † - syn of: Coptostoma quadratum (J. de C. Sowerby, 1822 †) - (CANCELLARIIDAE) (FOSSIL)
- quadrata, Cyclocardia subtenta quadrata (W.H. Dall †) - (CARDITIDAE) (FOSSIL)
- quadrata, Amphidoxa quadrata (G.P. Deshayes, 1851) - (CHAROPIDAE)
- quadrata, Pleurotomoides quadrata L.A. Reeve, 1845 - syn of: Glyphoturris quadrata (L.A. Reeve, 1845) - (CLATHURELLIDAE)
- quadrata, Ehrmanniella quadrata (O. Böttger, 1888) - (CLAUSILIIDAE)
- quadrata, Colpodaspis quadrata T.A. de M. Monterosato, 1874 - syn of: Colpodaspis pusilla (M. Sars, 1870) - (COLPODASPIDIDAE)
- quadrata, Corbula quadrata R.B. Hinds, 1843 - syn of: Basterotia quadrata (R.B. Hinds, 1843) - (CORBULIDAE)
- quadrata, Corbula quadrata S.C.T. Hanley, 1843 - syn of: Basterotia quadrata (R.B. Hinds, 1843) - (CORBULIDAE)
- quadrata, Indocrassatella quadrata (H. Noda, 1980) - (CRASSATELLIDAE)
- quadrata, Donaldina quadrata (J. Donald, 1898 †) - (DONALDINIDAE) (FOSSIL)
- quadrata, Entalina quadrata J. Henderson, 1920 - syn of: Entalina platamodes (R.B. Watson, 1879) - (ENTALINIDAE)
- quadrata, Arguniella quadrata (Martinson, 1957 †) - (FERGANOCONCHIDAE) (FOSSIL)
- quadrata, Flickia quadrata M. Collignon, 1964 † - (FLICKIIDAE) (FOSSIL)
- quadrata, Kalloclymenia quadrata Schindewolf, 1923 † - (GONIOCLYMENIIDAE) (FOSSIL)
- quadrata, Grammysia quadrata Lamont † - (GRAMMYSIIDAE) (FOSSIL)
- quadrata, Hardaghia quadrata Tavani 1949 † - (HIPPURITIDA (UNASSIGNED)) (FOSSIL)
- quadrata, Castalia quadrata G.B. Sowerby, 1869 - syn of: Castaliella sulcata (C.F.F. von Krauss, 1849) - (HYRIIDAE)
- quadrata, Bornia quadrata R.K. Dell, 1956 - (KELLIIDAE)
- quadrata, Neaeromya quadrata W.M. Gabb, 1873 - (LASAEIDAE)
- quadrata, Borniola quadrata (R.K. Dell, 1956) - (LASAEIDAE)
- quadrata, Limopsis quadrata Berezovsky, 2010 † - (LIMOPSIDAE) (FOSSIL)
- quadrata, Cardiolucina quadrata (B. Prashad, 1932) - (LUCINIDAE)
- quadrata, Epicodakia quadrata (G.F. Angas, 1877) - (LUCINIDAE)
- quadrata, Lucina quadrata (R.E. Dickerson, 1914 †) - (LUCINIDAE) (FOSSIL)
- quadrata, Lyonsiella quadrata C. Hedley, 1907 - (LYONSIELLIDAE)
- quadrata, Mactromya quadrata Rollier, 1913 † - (MACTROMYIDAE) (FOSSIL)
- quadrata, Glyphoturris quadrata (L.A. Reeve, 1845) - (MANGELIIDAE)
- quadrata, Mangelia quadrata L.A. Reeve, 1845 - syn of: Glyphoturris quadrata (L.A. Reeve, 1845) - (MANGELIIDAE)
- quadrata, Kimberella quadrata Glaessner, 1959 † - (MOLLUSCA INCERTAE SEDIS) (FOSSIL)
- quadrata, Gervillia quadrata C. Chen, 1976 † - (MYALINIDAE) (FOSSIL)
- quadrata, Selenimyalina quadrata Newell, 1942 † - (MYALINIDAE) (FOSSIL)
- quadrata, Cryptomya quadrata R. Arnold, 1910 - syn of: Cryptomya californica (T.A. Conrad, 1837) - (MYIDAE)
- quadrata, Myadora quadrata E.A. Smith, 1899 - syn of: Myadora compressa E.A. Smith, 1881 - (MYOCHAMIDAE)
- quadrata, Guizhoumyophoria quadrata (Yin, 1974 †) - (MYOPHORIIDAE) (FOSSIL)
- quadrata, Quadratia quadrata Yin, 1974 † - syn of: Guizhoumyophoria quadrata (Yin, 1974 †) - (MYOPHORIIDAE) (FOSSIL)
- quadrata, Bulliopsis quadrata (T.A. Conrad, 1830 †) - (NASSARIIDAE) (FOSSIL)
- quadrata, Nassa quadrata F.P. Marrat, 1880 - syn of: Nassarius crematus R.B. Hinds, 1844 - (NASSARIIDAE)
- quadrata, Philine quadrata (W. Wood, 1839) - (PHILINIDAE)
- quadrata, Philobrya quadrata (G.J. Pfeffer in E.C. Von Martens & G.J. Pfeffer, 1886) - (PHILOBRYIDAE)
- quadrata, Platyclymenia quadrata Czarnocki, 1989 † - (PLATYCLYMENIIDAE) (FOSSIL)
- quadrata, Quadricarina quadrata (Spitz, 1907 †) - (PORCELLIIDAE) (FOSSIL)
- quadrata, Cerithidea quadrata G.B. II Sowerby, 1866 - syn of: Cerithidea quoyii (J.B. Hombron & C.H. Jacquinot, 1848) - (POTAMIDIDAE)
- quadrata, Semuridia quadrata R.V. Melville, 1957 † - (PTERIIDA (UNASSIGNED)) (FOSSIL)
- quadrata, Pteronitella quadrata Williams & M. Breger, 1916 † - (PTERINEIDAE) (FOSSIL)
- quadrata, Quenstedtia quadrata T.C. Lan, 1976 † - (QUENSTEDTIIDAE) (FOSSIL)
- quadrata, Scissurella quadrata D.L. Geiger & P. Jansen, 2004 - (SCISSURELLIDAE)
- quadrata, Succinea quadrata C.M.F. Ancey, 1904 - (SUCCINEIDAE)
- quadrata, Conchocele quadrata Yabe & S. Nomura, 1925 † - (THYASIRIDAE) (FOSSIL)
- quadrata, Metaxia quadrata M.J. Faber, 2010 - (TRIPHORIDAE)
- quadrata, Pleurotoma quadrata L.A. Reeve, 1845 - syn of: Glyphoturris quadrata (L.A. Reeve, 1845) - (TURRIDAE)
- quadrata, Colpospira quadrata J. Donald, 1900 - (TURRITELLIDAE)
- quadrata, Anodontoides quadrata McCoy † - (UNIONIDAE) (FOSSIL)
- quadrata, Psorula quadrata (C.T. Simpson, 1914) - (UNIONIDAE)
- quadrata, Venus quadrata G.P. Deshayes, 1857 † - (VENERIDAE) (FOSSIL)
- quadrata, Verticordia quadrata E.A. Smith, 1885 - (VERTICORDIIDAE)
- quadrata, Sinotaia quadrata (W.H. Benson, 1842) - (VIVIPARIDAE)
- quadrata aeruginosa, Bellamya quadrata aeruginosa L.A. Reeve, 1863 - syn of: Sinotaia aeruginosa (L.A. Reeve, 1863) - (VIVIPARIDAE)
- quadrata disparis, Sinotaia quadrata disparis (P.M. Heude, 1890) - (VIVIPARIDAE)
- quadrata ecarinata, Bellamya quadrata ecarinata W. Kobelt, 1909 - syn of: Sinotaia ecarinata (W. Kobelt, 1909) - (VIVIPARIDAE)
- quadrata grandis, Philine quadrata grandis W. Leche, 1878 - (PHILINIDAE)
- quadrata heudei, Paludina quadrata heudei P. Dautzenberg & H. Fischer, 1905 - syn of: Sinotaia quadrata (W.H. Benson, 1842) - (VIVIPARIDAE)
- quadrata histrica, Sinotaia quadrata histrica (A.A. Gould, 1859) - (VIVIPARIDAE)
- quadrata monocingulata, Mangelia quadrata monocingulata W.H. Dall, 1889 - syn of: Saccharoturris monocingulata (W.H. Dall, 1889) - (MANGELIIDAE)
- quadrata reevei, Bellamya quadrata reevei P. Dautzenberg & H. Fischer, 1905 - syn of: Sinotaia reevei (P. Dautzenberg & H. Fischer, 1905) - (VIVIPARIDAE)
- quadrata rugirima, Glyphoturris quadrata rugirima W.H. Dall, 1889 - syn of: Glyphoturris rugirima (W.H. Dall, 1889) - (MANGELIIDAE)
- quadrata scitula, Colpospira quadrata scitula J. Donald, 1900 - syn of: Colpospira quadrata J. Donald, 1900 - (TURRITELLIDAE)
- Quadratia, syn of: Genus Guizhoumyophoria Fang, 2009 † (MYOPHORIIDAE) (FOSSIL)
- quadrativaricosum, Columbarium quadrativaricosum M.G. Harasewych, 2004 - (TURBINELLIDAE)
- quadratoides, Katacanites quadratoides Kullmann, 1963 † - (PROLECANITIDA (UNASSIGNED)) (FOSSIL)
- Quadratojaworskiella, Subgenus Jaworskiella (Quadratojaworskiella) Reyes & Perez, 1980 † (TRIGONIIDAE) (FOSSIL)
- quadratomaculatus, Conus quadratomaculatus G.B. II Sowerby, 1866 - syn of: Phasmoconus erythraeensis (L.A. Reeve, 1843) - (CONIDAE)
- Quadratonucula, Genus Quadratonucula Dickins, 1963 † (MALLETIIDAE) (FOSSIL)
- Quadratotrigonia, Genus Quadratotrigonia Dietrich, 1933 † (MYOPHORELLIDAE) (FOSSIL)
- quadratulus, Cucullus quadratulus P.F. Röding, 1798 - syn of: Graphiconus ochroleucus (J.F. Gmelin, 1791) - (CONIDAE)
- quadratum, Aegocrioceras quadratum (Crick, 1898 †) - (AEGOCRIOCERATIDAE) (FOSSIL)
- quadratum, Catastroboceras quadratum (Fleming, 1828 †) - (AKTUBONAUTILIDAE) (FOSSIL)
- quadratum, Pleuroceras quadratum (Howarth, 1958 †) - (AMALTHEIDAE) (FOSSIL)
- quadratum, Submeekoceras quadratum Chao, 1959 † - syn of: Submeekoceras hsuyuchieni (Chao, 1959 †) - (ARCTOCERATIDAE) (FOSSIL)
- quadratum, Caecum quadratum P.P. Carpenter, 1857 - (CAECIDAE)
- quadratum, Coptostoma quadratum (J. de C. Sowerby, 1822 †) - (CANCELLARIIDAE) (FOSSIL)
- quadratum, Cerastoderma glaucum quadratum M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1889 - (CARDIIDAE)
- quadratum, Phalium quadratum J.H.F. Link, 1807 - syn of: Casmaria ponderosa (J.F. Gmelin, 1791) - (CASSIDAE)
- quadratum, Eosyngastrioceras quadratum Titus, 2000 † - (GLAPHYRITIDAE) (FOSSIL)
- quadratum, Gonioceras quadratum Flower, 1957 † - (GONIOCERATIDAE) (FOSSIL)
- quadratum, Hildoceras quadratum Haug, 1885 † - syn of: Podagrosites latescens (C.T. Simpson, 1843 †) - (HILDOCERATIDAE) (FOSSIL)
- quadratum, Systrophoceras quadratum C. Chen, 1981 † - (LECHRITROCHOCERATIDAE) (FOSSIL)
- quadratum, Tegoceras quadratum Destombes, 1977 † - syn of: Tegoceras collignoni Breistroffer, 1953 † - (LYELLICERATIDAE) (FOSSIL)
- quadratum, Meekoceras quadratum (A. Hyatt 1879 †) - (MEEKOCERATIDAE) (FOSSIL)
- quadratum, Spathoderma quadratum D. Ivanov & A.H. Scheltema, 2008 - (PROCHAETODERMATIDAE)
- quadraturn, Cliftonoceras quadraturn (Flower, 1952 †) - (URANOCERATIDAE) (FOSSIL)
- quadratus, Arcestes quadratus Mojsisovics, 1873 † - syn of: Cladiscites quadratus (Mojsisovics, 1873 †) - (ARCESTIDAE) (FOSSIL)
- quadratus, Arietites quadratus (E. Donovan, 1952 †) - (ARIETITIDAE) (FOSSIL)
- quadratus, Leptesthes quadratus Martinson, 1957 † - syn of: Arguniella quadrata (Martinson, 1957 †) - (CARDIIDA (unassigned)) (FOSSIL)
- quadratus, Cladiscites quadratus (Mojsisovics, 1873 †) - (CLADISCITIDAE) (FOSSIL)
- quadratus, Prionocyclus quadratus Cobban, 1953 † - (COLLIGNONICERATIDAE) (FOSSIL)
- quadratus, Conus quadratus G.B. Brocchi, 1814 † - (CONIDAE) (FOSSIL)
- quadratus, Conus quadratus G. Perry, 1811 - syn of: Virroconus ebraeus (C. Linnaeus, 1758) - (CONIDAE)
- quadratus, Indocrassatella quadratus H. Noda, 1980 - syn of: Indocrassatella quadrata (H. Noda, 1980) - (CRASSATELLIDAE)
- quadratus, Nolaniceras quadratus M. Collignon, 1962 † - (DESHAYESITIDAE) (FOSSIL)
- quadratus, Clavus quadratus R.N. Kilburn, 1988 - (DRILLIIDAE)
- quadratus, Paratirolites quadratus W. Korn & Ghaderi, 2015 † - (DZHULFITIDAE) (FOSSIL)
- quadratus, Goniatites quadratus Trenkner, 1867 † - syn of: Maternoceras calculiformis (A.H.E. Beyrich, 1837 †) - (GONIATITIDAE) (FOSSIL)
- quadratus, Podagrosites quadratus (F.A. von Quenstedt, 1846 †) - (HILDOCERATIDAE) (FOSSIL)
- quadratus, Inoceramus convexus quadratus Etheridge † - (INOCERAMIDAE) (FOSSIL)
- quadratus, Perunautilus quadratus Crick & E.S. Sobolev, 1994 † - (LIROCERATIDAE) (FOSSIL)
- quadratus, Potamolithus quadratus H.A. Pilsbry & H.F.A. von Ihering, 1911 - (LITHOGLYPHIDAE)
- quadratus, Somatogyrus quadratus B. Walker, 1906 - (LITHOGLYPHIDAE)
- quadratus, Typhis quadratus R.B. Hinds, 1843 - syn of: Typhisopsis coronatus (W.J. Broderip, 1833) - (MURICIDAE)
- quadratus, Mytilus quadratus W.M. Gabb, 1869 † - (MYTILIDAE) (FOSSIL)
- quadratus, Wasatchites quadratus Mathews, 1929 † - syn of: Wasatchites perrini Mathews, 1929 † - (PRIONITIDAE) (FOSSIL)
- quadratus, Isognomon quadratus H.E. Anton, 1837 - syn of: Isognomon recognitus J.F. Mabille, 1895 - (PTERIIDAE)
- quadratus, Sinuites quadratus E.F.R.K. Koken & J. Perner, 1925 † - (SINUITIDAE) (FOSSIL)
- quadratus, Strombus quadratus G. Perry, 1811 - syn of: Lobatus raninus (J.F. Gmelin, 1791) - (STROMBIDAE)
- quadratus, Leislingites quadratus Tozer, 1994 † - (THETIDITIDAE) (FOSSIL)
- quadratus, Unio quadratus I. Lea, 1859 - syn of: Elliptio fumata (I. Lea, 1857) - (UNIONIDAE)
- quadratus, Viviparus quadratus W.H. Benson, 1842 - syn of: Sinotaia quadrata (W.H. Benson, 1842) - (VIVIPARIDAE)
- quadratus turritus, Viviparus quadratus turritus T.C. Yen, 1939 - syn of: Sinotaia turrita (T.C. Yen, 1939) - (VIVIPARIDAE)
- quadraxialis, Anatoma quadraxialis D.L. Geiger, 2012 - (ANATOMIDAE)
- quadriangula, Erosaria marginalis quadriangula L. Bozzetti, 2011 - (CYPRAEIDAE)
- quadriangularis, Palaeomutela quadriangularis Netschajew, 1894 † - (PALAEOMUTELIDAE) (FOSSIL)
- quadriangulata, Venericardia quadriangulata S. Nomura & N. Zinbo, 1934 - syn of: Centrocardita millegrana (S. Nomura & N. Zinbo, 1934) - (CARDITIDAE)
- quadriangulata, Glans quadriangulata S. Nomura & N. Zinbo, 1934 - syn of: Centrocardita millegrana (S. Nomura & N. Zinbo, 1934) - (CARDITIDAE)
- Quadricarina, Genus Quadricarina Blodgett & Johnson, 1992 † (PORCELLIIDAE) (FOSSIL)
- quadricarinata, Sitala quadricarinata G.P.L.K. Gude, 1917 - (ARIOPHANTIDAE)
- quadricarinata, Trichotropis quadricarinata A. Adams, 1861 - (CAPULIDAE)
- quadricarinata, Omphaloptycha quadricarinata (Stoppani, 1858 †) - (COELOSTYLINIDAE) (FOSSIL)
- quadricarinata, Philalanka quadricarinata (G.P.L.K. Gude, 1917) - (ENDODONTIDAE)
- quadricarinata, Pseudodianella quadricarinata (Fuchs, 1877) † - (HYDROBIIDAE) (FOSSIL)
- quadricarinata, Mathilda quadricarinata (G.B. Brocchi, 1814) - (MATHILDIDAE)
- quadricarinata, Lodanaria quadricarinata (Stauffer, 1909 †) - (MURCHISONIIDAE) (FOSSIL)
- quadricarinata, Hypergonia quadricarinata (F. McCoy, 1844 †) - (ORTHONEMIDAE) (FOSSIL)
- quadricarinatum, Cyclostrema quadricarinatum J.C. Melvill & R. Standen, 1901 - (LIOTIIDAE)
- quadricarinatus, Euchelus quadricarinatus H.S. Holten, 1802 - syn of: Euchelus asper quadricarinatus (H.S. Holten, 1802) - (CHILODONTIDAE)
- quadricarinatus, Euchelus asper quadricarinatus (H.S. Holten, 1802) - (CHILODONTIDAE)
- quadricarinatus, Circulus quadricarinatus A.W. Janssen, 1967 † - (TORNIDAE) (FOSSIL)
- quadricarinatus, Trochus quadricarinatus H.S. Holten, 1802 - syn of: Euchelus asper quadricarinatus (H.S. Holten, 1802) - (TROCHIDAE)
- quadriceps, Solarium quadriceps R.B. Hinds, 1887 - syn of: Architectonica nobilis P.F. Röding, 1798 - (ARCHITECTONICIDAE)
- quadricincta, Aphanitoma quadricincta A.E.M. Cossmann, 1883 † - (BORSONIIDAE) (FOSSIL)
- quadricincta, Japonia quadricincta (E.A. Smith, 1895) - (CYCLOPHORIDAE)
- quadricincta, Stegocoelia quadricincta (Winchell, 1863 †) - (GONIASMATIDAE) (FOSSIL)
- quadricincta, Devonorhineoderma quadricincta (G.A. Goldfuss, 1844 †) - (GOSSELETINIDAE) (FOSSIL)
- quadricincta, Hemicycla quadricincta (P.M.A. Morelet, 1864) - (HELICIDAE)
- quadricincta, Echinolittorina quadricincta (J.K. Megerle Von Mühlfeld, 1824) - (LITTORINIDAE)
- quadricincta, Murchisonia quadricincta Winchell, 1863 † - syn of: Stegocoelia quadricincta (Winchell, 1863 †) - (MURCHISONIIDAE) (FOSSIL)
- quadricincta, Endiatoma quadricincta (A.E.M. Cossmann, 1883 †) - (PYRAMIMITRIDAE) (FOSSIL)
- quadricincta, Solariella quadricincta J.F. Quinn, 1992 - syn of: Solariella carvalhoi H. de Souza Lopes & P.d. Cardoso, 1958 - (SOLARIELLIDAE)
- quadricincta subaucta, Hemicycla quadricincta subaucta (T.V. Wollaston, 1878) - (HELICIDAE)
- quadricinctum, Bittium quadricinctum E.A. Smith, 1903 - (CERITHIIDAE)
- quadricinctum, Cerithium beanii quadricinctum Hudleston † - (CERITHIIDAE) (FOSSIL)
- quadricinctus, Nodilittorina quadricinctus J.K. Megerle Von Mühlfeld, 1824 - syn of: Echinolittorina quadricincta (J.K. Megerle Von Mühlfeld, 1824) - (LITTORINIDAE)
- quadricinctus, Mangelia quadricinctus H.H. Suter, 1908 - syn of: Terefundus quadricinctus (H.H. Suter, 1908) - (MANGELIIDAE)
- quadricinctus, Veterator quadricinctus (J. Marwick, 1931 †) - (MATHILDIDAE) (FOSSIL)
- quadricinctus, Terefundus quadricinctus (H.H. Suter, 1908) - (MURICIDAE)
- quadricinctus, Trochus quadricinctus J.K. Megerle Von Mühlfeld, 1824 - (TROCHIDAE)
- quadricinctus unicarinatus, Terefundus quadricinctus unicarinatus R.K. Dell, 1956 - (MURICIDAE)
- quadricolor, Aeropictus quadricolor (L. Pfeiffer, 1847) - (AMPHIBULIMIDAE)
- quadricolor, Bulimus quadricolor L. Pfeiffer, 1847 - syn of: Aeropictus quadricolor (L. Pfeiffer, 1847) - (BULIMULIDAE)
- quadricolor, Calliostoma quadricolor M.M. Schepman, 1908 - (CALLIOSTOMATIDAE)
- quadricolor, Chromodoris quadricolor (W.P.E.S. Rüppell & F.S. Leuckart, 1830) - (CHROMODORIDIDAE)
- quadricolor, Glossodoris quadricolor W.P.E.S. Rüppell & F.S. Leuckart, 1828 - syn of: Chromodoris quadricolor (W.P.E.S. Rüppell & F.S. Leuckart, 1830) - (CHROMODORIDIDAE)
- quadricolor, Chromodoris quadricolor W.P.E.S. Rüppell & F.S. Leuckart, 1830 - syn of: Chromodoris quadricolor (W.P.E.S. Rüppell & F.S. Leuckart, 1830) - (CHROMODORIDIDAE)
- quadricolor, Doris quadricolor W.P.E.S. Rüppell & F.S. Leuckart, 1830 - syn of: Chromodoris quadricolor (W.P.E.S. Rüppell & F.S. Leuckart, 1830) - (DORIDIDAE)
- quadricolor, Godiva quadricolor (K.H. Barnard, 1927) - (FACELINIDAE)
- quadricolor, Nerita quadricolor J.F. Gmelin, 1791 - (NERITIDAE)
- quadriconstrictum, Muensteroceras quadriconstrictum W. Korn & al., 2003 † - (MUENSTEROCERATIDAE) (FOSSIL)
- quadricordata, Danilia quadricordata J.P.J. Ravn, 1933 † - (CHILODONTIDAE) (FOSSIL)
- quadricordata, Monodonta quadricordata J.P.J. Ravn, 1933 † - (TROCHIDAE) (FOSSIL)
- quadricornis, Doris quadricornis G. Montagu, 1813 - syn of: Okenia aspersa (J. Alder & A. Hancock, 1845) - (DORIDIDAE)
- quadricornis, Okenia quadricornis G. Montagu, 1815 - syn of: Okenia aspersa (J. Alder & A. Hancock, 1845) - (GONIODORIDIDAE)
- quadricornutum, Phricodoceras quadricornutum C.T. Simpson, 1855 † - (PHRICODOCERATIDAE) (FOSSIL)
- quadricostata, Stegocoelia quadricostata Chronic, 1952 † - (GONIASMATIDAE) (FOSSIL)
- quadricostata, Mathilda quadricostata J. Gründel & al., 2012 † - (MATHILDIDAE) (FOSSIL)
- quadricostata, Ecphora quadricostata (T.A. Conrad, 1830 †) - (MURICIDAE) (FOSSIL)
- quadricostata, Neithea quadricostata (J. de C. Sowerby, 1814 †) - (PECTINIDAE) (FOSSIL)
- quadricostata, Protorcula quadricostata J. Gründel, 2007 † - (PROTORCULIDAE) (FOSSIL)
- quadricostata, Tegula quadricostata (W. Wood, 1828) - (TEGULIDAE)
- quadricostata lastroensis, Neithea quadricostata lastroensis C.J. Maury, 1936 † - (PECTINIDAE) (FOSSIL)
- quadricostata regoi, Neithea quadricostata regoi C.J. Maury, 1936 † - (PECTINIDAE) (FOSSIL)
- quadricostatum, Eudentalium quadricostatum (J.W. Brazier, 1877) - (DENTALIIDAE)
- quadricostatum, Cantallocostoma quadricostatum (Wood, 1828 †) - (TROCHIDAE) (FOSSIL)
- quadricostatus, Pecten quadricostatus F.A. Roemer, 1849 † - syn of: Neithea occidentalis (T.A. Conrad, 1855 †) - (PECTINIDAE) (FOSSIL)
- quadricostatus, Pecten quadricostatus J. de C. Sowerby, 1814 † - syn of: Neithea quadricostata (J. de C. Sowerby, 1814 †) - (PECTINIDAE) (FOSSIL)
- quadricostatus, Adeorbis quadricostatus Schopp, 1888 † - syn of: Orbitestella plicatella (A.E.M. Cossmann, 1888 †) - (TORNIDAE) (FOSSIL)
- quadricyclia, Shaninopsis quadricyclia Isberg, 1934 † - (VLASTIDAE) (FOSSIL)
- quadridens, Carychiopsis quadridens Andreae, 1884 † - (ELLOBIIDAE) (FOSSIL)
- quadridens, Pedipes quadridens L. Pfeiffer, 1839 - syn of: Pedipes mirabilis (J.K. Megerle Von Mühlfeld, 1816) - (ELLOBIIDAE)
- quadridens, Jaminia quadridens (O.F. Müller, 1774) - (ENIDAE)
- quadridens, Gastrocopta quadridens H.A. Pilsbry, 1916 - (GASTROCOPTIDAE)
- quadridens, Imeroherpia quadridens L. Salvini-Plawén, 1978 - (IMEROHERPIIDAE)
- quadridens, Berthellina quadridens (O.A.L. Mörch, 1863) - (PLEUROBRANCHIDAE)
- quadridens, Vertigo quadridens C.A. Westerlund, 1871 - syn of: Isthmia pygmaea (J.P.R. Draparnaud, 1801) - (VERTIGINIDAE)
- quadridens elongata, Jaminia quadridens elongata (A. Moquin-Tandon, 1856) - (ENIDAE)
- quadridentata, Marathonites quadridentata Ruzhentsev, 1933 † - syn of: Kargalites typicus (Ruzhentsev, 1933 †) - (ADRIANITIDAE) (FOSSIL)
- quadridentata, Diacria quadridentata (H.M.D. de Blainville, 1821) - (CAVOLINIIDAE)
- quadridentata, Cymbulia quadridentata C. Gegenbaur, 1855 - syn of: Cymbulia peronii H.M.D. de Blainville, 1818 - (CYMBULIIDAE)
- quadridentata, Stramonita quadridentata (E.H. Vokes, 1989 †) - (MURICIDAE) (FOSSIL)
- quadridentata, Caracolus quadridentata K.T. Menke, 1829 - syn of: Pleurodonte soror (A.E.J. Férussac, 1821) - (PLEURODONTIDAE)
- quadridentata, Vertigo quadridentata A. Moquin-Tandon, 1856 - syn of: Isthmia pygmaea (J.P.R. Draparnaud, 1801) - (VERTIGINIDAE)
- quadridentata costata, Cavolinia quadridentata costata G.J. Pfeffer, 1879 - syn of: Diacria quadridentata (H.M.D. de Blainville, 1821) - (CAVOLINIIDAE)
- quadridentata erythra, Diacria quadridentata erythra S. Van Der Spoel, 1971 - syn of: Diacria erythra S. Van Der Spoel, 1971 - (CAVOLINIIDAE)
- quadridentata schmidti, Diacria quadridentata schmidti Leyen & S. Van Der Spoel, 1982 - syn of: Diacria schmidti S. Van Der Spoel, 1971 - (CAVOLINIIDAE)
- quadridentatum, Siphonodentalium quadridentatum W.H. Dall, 1881 - syn of: Polyschides tetraschistus (R.B. Watson, 1879) - (GADILIDAE)
- quadridentatus, Labyrinthus quadridentatus (W.J. Broderip, 1832) - (CAMAENIDAE)
- quadridentatus, Nassarius quadridentatus W.C. Mansfield, 1930 - (NASSARIIDAE)
- quadridentatus acompsus, Cadulus quadridentatus acompsus J. Henderson, 1920 - syn of: Polyschides tetraschistus (R.B. Watson, 1879) - (GADILIDAE)
- quadridentatus biolleyi, Labyrinthus quadridentatus biolleyi G.A. Solem, 1966 - (CAMAENIDAE)
- quadrifasciata, Planispira quadrifasciata E.J. Le Guillou, 1842 - (CAMAENIDAE)
- quadrifasciata, Gibberula quadrifasciata (F.P. Marrat, 1873) - (CYSTISCIDAE)
- quadrifasciata, Serrata quadrifasciata F. Boyer, 2008 - (MARGINELLIDAE)
- quadrifasciata, Marginella quadrifasciata F.P. Marrat, 1873 - syn of: Gibberula quadrifasciata (F.P. Marrat, 1873) - (MARGINELLIDAE)
- quadrifasciata, Crassispira quadrifasciata (L.A. Reeve, 1845) - (PSEUDOMELATOMIDAE)
- quadrifasciata, Turritella quadrifasciata F. Traub, 1938 † - (TURRITELLIDAE) (FOSSIL)
- quadrifasciatus, Drymaeus quadrifasciatus (G.F. Angas, 1878) - (BULIMULIDAE)
- quadrifasciatus, Drymaeus chiapensis quadrifasciatus E.C. Von Martens, 1893 - (BULIMULIDAE)
- quadrifasciatus, Theodoxus quadrifasciatus (E.A. Bielz, 1864 †) - (NERITIDAE) (FOSSIL)
- quadrifasciatus, Tornus quadrifasciatus (J.P.S. Grateloup, 1832 †) - (TORNIDAE) (FOSSIL)
- quadrifasciatus, Turbo quadrifasciatus G. Montagu, 1803 - syn of: Lacuna vincta (G. Montagu, 1803) - (TURBINIDAE)
- quadrifera, Clymenia quadrifera F. McCoy, 1851 † - syn of: Clymenia striata Münster † - (CLYMENIIDAE) (FOSSIL)
- quadrificus, Propolyptychites quadrificus (A. von Koenen, 1902 †) - (POLYPTYCHITIDAE) (FOSSIL)
- quadrifida, Seila quadrifida (G.P. Deshayes, 1833 †) - (CERITHIOPSIDAE) (FOSSIL)
- quadrifida, Cerithiella quadrifida G.P. Deshayes, 1833 † - syn of: Seila quadrifida (G.P. Deshayes, 1833 †) - (NEWTONIELLIDAE) (FOSSIL)
- quadrifida, Sonninia quadrifida Buckman † - (SONNINIIDAE) (FOSSIL)
- quadrifidus, Aporrhais quadrifidus E.M. Da Costa, 1776 - syn of: Aporrhais pespelicani (C. Linnaeus, 1758) - (APORRHAIDAE)
- quadrifidus, Propolyptychites quadrifidus (A. von Koenen 1902 †) - (POLYPTYCHITIDAE) (FOSSIL)
- quadrifilaris, Pilorcula trifilaris quadrifilaris (O.W. Von Rosen, 1905) - (ORCULIDAE)
- quadrifilatum, Lirobittium quadrifilatum (P.P. Carpenter, 1864) - (CERITHIIDAE)
- quadrifilosa, Japonia trilirata quadrifilosa (W.H. Benson, 1852) - (CYCLOPHORIDAE)
- quadrifissatum, Cadulus quadrifissatum H.A. Pilsbry & B. Sharp, 1898 - syn of: Polyschides quadrifissatus (H.A. Pilsbry & B. Sharp, 1898) - (GADILIDAE)
- quadrifissatus, Polyschides quadrifissatus (H.A. Pilsbry & B. Sharp, 1898) - (GADILIDAE)
- quadrifoglio, Belgrandiella quadrifoglio M. Haase, 2003 - (HYDROBIIDAE)
- quadrifrons, Murex quadrifrons J.B.P.A. Lamarck, 1822 - syn of: Chicoreus capucinus (J.B.P.A. Lamarck, 1822) - (MURICIDAE)
- quadrigatum, Glabrocingulum quadrigatum Sadlick & C. Nielsen, 1963 † - (GOSSELETINIDAE) (FOSSIL)
- quadrigenarium, Dallocardia quadrigenarium T.A. Conrad, 1837 - syn of: Dallocardia quadragenarium (T.A. Conrad, 1837) - (CARDIIDAE)
- quadrii, Synthopsis quadrii A. Cecalupo & I. Perugia, 2012 - (CERITHIOPSIDAE)
- quadrilamellata, Pilsbryna quadrilamellata J. Slapcinsky & J. Coles, 2003 - (ZONITIDAE)
- quadrilamellatus, Gudeodiscus emigrans quadrilamellatus B. Páll-Gergely, 2013 - (PLECTOPYLIDAE)
- Quadrilatera, Genus Quadrilatera Cossmann, 1904 † (ARCIDAE) (FOSSIL)
- quadrilatera, Arca quadrilatera J.B.P.A. Lamarck, 1805 † - (ARCIDAE) (FOSSIL)
- quadrilatera, Arca quadrilatera G.B. I Sowerby, 1833 - syn of: Larkinia grandis quadrilatera (G.B. I Sowerby, 1833) - (ARCIDAE)
- quadrilatera, Larkinia grandis quadrilatera (G.B. I Sowerby, 1833) - (ARCIDAE)
- quadrilatera, Castalia quadrilatera D'Orbigny, 1835 - syn of: Castalia ambigua quadrilatera D'Orbigny, 1835 - (HYRIIDAE)
- quadrilatera, Castalia ambigua quadrilatera D'Orbigny, 1835 - (HYRIIDAE)
- quadrilatera, Marionia quadrilatera Schultz in R.A. Philippi, 1836 - syn of: Marionia blainvillea (A. Risso, 1818) - (TRITONIIDAE)
- quadrilateralis, Armina quadrilateralis (L.S.R. Bergh, 1860) - (ARMINIDAE)
- quadrilateralis, Linguella quadrilateralis (L.S.R. Bergh, 1860) - syn of: Armina quadrilateralis (L.S.R. Bergh, 1860) - (ARMINIDAE)
- quadrilateralis, Eustreptaxis quadrilateralis H.B. Preston, 1910 - (STREPTAXIDAE)
- quadrilaterus, Unio quadrilaterus I. Lea, 1863 - syn of: Unio abbevillensis I. Lea, 1857 - (UNIONIDAE)
- quadrilineata, Doris quadrilineata O.F. Müller, 1776 - syn of: Polycera quadrilineata (O.F. Müller, 1776) - (DORIDIDAE)
- quadrilineata, Facelina quadrilineata (K. Baba, 1930) - (FACELINIDAE)
- quadrilineata, Dictyotomaria quadrilineata (Girty, 1934 †) - (GOSSELETINIDAE) (FOSSIL)
- quadrilineata, Cryoturris quadrilineata (C.B. Adams, 1850) - (MANGELIIDAE)
- quadrilineata, Citharomangelia quadrilineata (G.B. III Sowerby, 1913) - (MANGELIIDAE)
- quadrilineata, Kurtziella quadrilineata C.B. Adams, 1850 - syn of: Cryoturris quadrilineata (C.B. Adams, 1850) - (MANGELIIDAE)
- quadrilineata, Eucithara quadrilineata G.B. III Sowerby, 1913 - syn of: Citharomangelia quadrilineata (G.B. III Sowerby, 1913) - (MANGELIIDAE)
- quadrilineata, Mangelia quadrilineata C.B. Adams, 1850 - syn of: Cryoturris quadrilineata (C.B. Adams, 1850) - (MANGELIIDAE)
- quadrilineata, Cryptospira quadrilineata (J.S. Gaskoin, 1849) - (MARGINELLIDAE)
- quadrilineata, Marginella quadrilineata L.A. Reeve, 1864 - syn of: Cryptospira quadrilineata (J.S. Gaskoin, 1849) - (MARGINELLIDAE)
- quadrilineata, Marginella quadrilineata J.S. Gaskoin, 1849 - syn of: Cryptospira quadrilineata (J.S. Gaskoin, 1849) - (MARGINELLIDAE)
- quadrilineata, Nerinea quadrilineata Stanton, 1947 † - (NERINEIDAE) (FOSSIL)
- quadrilineata, Phyllidia quadrilineata L.S.R. Bergh, 1905 - syn of: Phyllidia varicosa J.B.P.A. Lamarck, 1801 - (PHYLLIDIIDAE)
- quadrilineata, Polycera quadrilineata (O.F. Müller, 1776) - (POLYCERIDAE)
- quadrilineata, Pleurotoma quadrilineata C.B. Adams, 1850 - syn of: Cryoturris quadrilineata (C.B. Adams, 1850) - (TURRIDAE)
- quadrilineata marplatensis, Polycera quadrilineata marplatensis G.J. Franceschi, 1928 - syn of: Polycera marplatensis G.J. Franceschi, 1928 - (POLYCERIDAE)
- quadrilineata mediterranea, Polycera quadrilineata mediterranea L.S.R. Bergh, 1879 - syn of: Polycera quadrilineata (O.F. Müller, 1776) - (POLYCERIDAE)
- quadrilineata nigrolineata, Polycera quadrilineata nigrolineata P. Dautzenberg & P. Durouchoux, 1913 - syn of: Polycera quadrilineata (O.F. Müller, 1776) - (POLYCERIDAE)
- quadrilineata nigropicta, Polycera quadrilineata nigropicta H.F.A. von Ihering, 1886 - syn of: Polycera quadrilineata (O.F. Müller, 1776) - (POLYCERIDAE)
- quadrilineatum, Eutrephoceras quadrilineatum (J. Favre, 1869 †) - (NAUTILIDAE) (FOSSIL)
- quadrilineatus, Dictyoconites quadrilineatus Mojsisovics, 1902 † - (AULACOCERATIDAE) (FOSSIL)
- quadrilineatus, Spiranodus quadrilineatus Heidelberger, 2001 † - (PLATYCERATIDAE) (FOSSIL)
- quadrilineatus, Trochus quadrilineatus Klipstein, 1843 † - (TROCHIDAE) (FOSSIL)
- quadrilira, Turritella quadrilira Johnson, 1898 † - (TURRITELLIDAE) (FOSSIL)
- quadrilirata, Trichotropis quadrilirata A. Adams, 1874 - syn of: Trichotropis quadricarinata A. Adams, 1861 - (CAPULIDAE)
- quadrilirata, Seila quadrilirata (B. Wade, 1926 †) - (CERITHIOPSIDAE) (FOSSIL)
- quadrilirata, Glorichlamys quadrilirata (C.E. Lischke, 1870) - (PECTINIDAE)
- quadrilirata, Longoconcha quadrilirata N.F. Sohl, 1964 † - (PHOLIDOTOMIDAE) (FOSSIL)
- quadrilirata, Carinodrillia quadrilirata (E.A. Smith, 1882) - (PSEUDOMELATOMIDAE)
- quadrilirata, Pleurotoma quadrilirata E.A. Smith, 1882 - syn of: Carinodrillia quadrilirata (E.A. Smith, 1882) - (TURRIDAE)
- quadriliratus, Drepanocheilus quadriliratus (B. Wade, 1926 †) - (APORRHAIDAE) (FOSSIL)
- quadrilix, Quadricarina quadrilix (J.W. Hall, 1879 †) - (PORCELLIIDAE) (FOSSIL)
- quadrillineatum, Cyclostrema quadrillineatum F. Toula, 1911 † - (LIOTIIDAE) (FOSSIL)
- quadrillum, Clathromangelia quadrillum (F. Dujardin, 1837) - (CLATHURELLIDAE)
- quadrillum, Mangelia quadrillum F. Dujardin, 1837 - syn of: Clathromangelia quadrillum (F. Dujardin, 1837) - (MANGELIIDAE)
- quadrillum meridionalis, Clathromangelia quadrillum meridionalis M.A. Peyrot, 1932 † - (CLATHURELLIDAE) (FOSSIL)
- quadriloba, Lobaria quadriloba O.F. Müller, 1776 - syn of: Philine quadripartita P. Ascanius, 1772 - (PHILINIDAE)
- quadrilobata, Lobaria quadrilobata J.F. Gmelin, 1791 - syn of: Philine quadripartita P. Ascanius, 1772 - (PHILINIDAE)
- quadrilobatus, Bellerophon quadrilobatus Reed, 1904 † - syn of: Plectonotus quadrilobatus (Reed, 1904 †) - (BELLEROPHONTIDAE) (FOSSIL)
- quadrilobatus, Plectonotus quadrilobatus (Reed, 1904 †) - (PLECTONOTIDAE) (FOSSIL)
- quadrimaculata, Eclogavena quadrimaculata (J.E. Gray, 1824) - (CYPRAEIDAE)
- quadrimaculata, Cypraea quadrimaculata J.E. Gray, 1824 - syn of: Eclogavena quadrimaculata (J.E. Gray, 1824) - (CYPRAEIDAE)
- quadrimaculata, Blasicrura quadrimaculata J.E. Gray, 1824 - syn of: Eclogavena quadrimaculata (J.E. Gray, 1824) - (CYPRAEIDAE)
- quadrimaculata, Pustularia quadrimaculata P. Dautzenberg & J.L. Bouge, 1933 - syn of: Pustularia bistrinotata F.A. Schilder & M. Schilder, 1937 - (CYPRAEIDAE)
- quadrimaculata, Atagema quadrimaculata A.W. Collier, 1963 - syn of: Atagema alba (O'Donoghue, 1927) - (DISCODORIDIDAE)
- quadrimaculata, Onchidoris quadrimaculata (A.E. Verrill, 1900) - (ONCHIDORIDIDAE)
- quadrimaculata, Triphora quadrimaculata R.P.J. Hervier, 1898 - syn of: Notosinister quadrimaculatus (R.P.J. Hervier, 1898) - (TRIPHORIDAE)
- quadrimaculata garretti, Eclogavena quadrimaculata garretti F.A. Schilder & M. Schilder, 1938 - syn of: Eclogavena quadrimaculata thielei (F.A. Schilder & M. Schilder, 1938) - (CYPRAEIDAE)
- quadrimaculata pallidula, Cypraea quadrimaculata pallidula J.S. Gaskoin, 1849 - syn of: Blasicrura pallidula (J.S. Gaskoin, 1849) - (CYPRAEIDAE)
- quadrimaculata thielei, Eclogavena quadrimaculata thielei (F.A. Schilder & M. Schilder, 1938) - (CYPRAEIDAE)
- quadrimaculatus, Notosinister quadrimaculatus (R.P.J. Hervier, 1898) - (TRIPHORIDAE)
- quadrina, Iravadia quadrina (C.F. Laseron, 1956) - (IRAVADIIDAE)
- quadrina, Planapexia quadrina C.F. Laseron, 1956 - syn of: Iravadia quadrina (C.F. Laseron, 1956) - (RISSOINIDAE)
- Quadrinervus, Genus Quadrinervus Cossmann, 1904 † (APORRHAIDAE) (FOSSIL)
- quadrinodosa, Galeodea quadrinodosa F. Settepassi, 1970 - syn of: Galeodea echinophora (C. Linnaeus, 1758) - (CASSIDAE)
- quadrinodosus, Hamites quadrinodosus Jimbo, 1894 † - (HAMITIDAE) (FOSSIL)
- quadripaludium, Mexithauma quadripaludium D.W. Taylor, 1966 - (COCHLIOPIDAE)
- quadripartita, Philine quadripartita P. Ascanius, 1772 - (PHILINIDAE)
- quadripartitus, Goniatites quadripartitus G.G. Münster, 1839 † - syn of: Prionoceras lineare (G.G. Münster, 1832 †) - (GONIATITIDAE) (FOSSIL)
- quadripartitus, Subalpinites quadripartitus (Steuer, 1897 †) - (NEOCOMITIDAE) (FOSSIL)
- quadriplicata, Volvaria quadriplicata A. Risso, 1826 - syn of: Gibberula miliaria (C. Linnaeus, 1758) - (ACTEONIDAE)
- Quadriplicata, Genus Quadriplicata O. Böttger, 1878 (CLAUSILIIDAE)
- quadriplicata, Quadriplicata quadriplicata (A. Schmidt, 1868) - (CLAUSILIIDAE)
- quadriplicata, Ovatella quadriplicata J.R. Bourguignat, 1864 - syn of: Myosotella myosotis (J.P.R. Draparnaud, 1801) - (ELLOBIIDAE)
- quadriplicata, Volvarina quadriplicata A. Risso, 1826 - syn of: Volvarina mitrella (A. Risso, 1826) - (MARGINELLIDAE)
- quadriplicata, Peilinia quadriplicata (Shumard, 1854 †) - (OSTREIDAE) (FOSSIL)
- quadriplicata, Protoma quadriplicata (B. de Basterot, 1825 †) - (TURRITELLIDAE) (FOSSIL)
- quadriplicata inaequiplicata, Protoma quadriplicata inaequiplicata A.E.M. Cossmann & M.A. Peyrot, 1922 † - (TURRITELLIDAE) (FOSSIL)
- quadriplicatum, Sanguinolites quadriplicatum Snider 1915 † - (SANGUINOLITIDAE) (FOSSIL)
- quadriplicatus, Anodon quadriplicatus G.B. Sowerby, 1870 - syn of: Strophitus undulatus (T. Say, 1817) - (UNIONIDAE)
- quadripunctata, Bullata quadripunctata (É.A.A. Locard, 1897) - (MARGINELLIDAE)
- quadripunctata, Niveria quadripunctata (J.E. Gray, 1827) - (TRIVIIDAE)
- quadripuntata, Trivia quadripuntata Gray, 1827 - syn of: Niveria quadripunctata (J.E. Gray, 1827) - (TRIVIIDAE)
- quadriradiata, Diodora quadriradiata L.A. Reeve, 1850 - (FISSURELLIDAE)
- quadriradiata, Tapes quadriradiata G.P. Deshayes, 1853 - syn of: Tapes belcheri Sowerby, 1852 - (VENERIDAE)
- quadriradiatus, Olcostephanus quadriradiatus Imlay, 1938 † - (OLCOSTEPHANIDAE) (FOSSIL)
- quadriradiatus, Pecten quadriradiatus J.B.P.A. Lamarck, 1819 - (PECTINIDAE)
- quadrisculpta, Afroguppya quadrisculpta (M. Connolly, 1939) - (EUCONULIDAE)
- quadriserata, Architectonica quadriserata G.B. Sowerby, 1850 † - (ARCHITECTONICIDAE) (FOSSIL)
- quadriseriata, Agathotoma quadriseriata (W.H. Dall, 1919) - (MANGELIIDAE)
- quadriseriata, Pachymelania quadriseriata (J.E. Gray, 1831) - syn of: Pachymelania fusca quadriseriata (J.E. Gray, 1831) - (THIARIDAE)
- quadriseriata, Pachymelania fusca quadriseriata (J.E. Gray, 1831) - (THIARIDAE)
- quadriseriatum, Pseudomalaxis quadriseriatum G.B. I Sowerby, 1850 - syn of: Architectonica nobilis P.F. Röding, 1798 - (ARCHITECTONICIDAE)
- quadriserrata, Glyptospira quadriserrata Batten, 1995 † - (MICRODOMATIDAE) (FOSSIL)
- quadrispinosum, Siphopteron quadrispinosum T.M. Gosliner, 1989 - (GASTROPTERIDAE)
- quadrispinosus, Pseudoxybeloceras quadrispinosus (Jimbo, 1894 †) - (DIPLOMOCERATIDAE) (FOSSIL)
- quadrispiralis, Socienna quadrispiralis (C.F. Laseron, 1951) - (CERITHIOPSIDAE)
- quadrispiralis, Etremopsis quadrispiralis Powell, 1942 † - (CLATHURELLIDAE) (FOSSIL)
- quadrispiralis, Strioterebrum quadrispiralis N.E. Weisbord, 1962 - syn of: Euterebra angelli (J. Gibson-Smith & W. Gibson-Smith, 1984) - (TEREBRIDAE)
- quadrisulcata, Bucaniella quadrisulcata Reed, 1921 † - (BELLEROPHONTIDAE) (FOSSIL)
- quadrisulcata, Eunema quadrisulcata Ulrich & Scofield, 1897 † - (LOPHOSPIRIDAE) (FOSSIL)
- quadrisulcata, Divalinga quadrisulcata (A.V.M.D. D'Orbigny, 1846) - (LUCINIDAE)
- quadrisulcata, Lucina quadrisulcata D'Orbigny, 1846 - syn of: Divalinga quadrisulcata (A.V.M.D. D'Orbigny, 1846) - (LUCINIDAE)
- quadrisulcata, Perna quadrisulcata H.F.A. von Ihering, 1897 † - syn of: Isognomon maxillata (J.B.P.A. Lamarck, 1819 †) - (MYTILIDAE) (FOSSIL)
- quadrisulcata, Isognomon quadrisulcata H.F.A. von Ihering, 1897 † - (PTERIIDAE) (FOSSIL)
- quadrisulcatus, Cadulus quadrisulcatus (W.H. Dall) - (GADILIDAE)
- quadrisulcatus, Protetragonites quadrisulcatus (A.V.M.D. D'Orbigny, 1841 †) - (LYTOCERATIDAE) (FOSSIL)
- quadritaeniatus, Drymaeus farrisi quadritaeniatus W.K. Weyrauch, 1956 - (BULIMULIDAE)
- quadrituberculatum, Epicheloniceras quadrituberculatum M. Collignon, 1962 † - (DOUVILLEICERATIDAE) (FOSSIL)
- quadriturritus, Cadulus quadriturritus Meyer, 1886 † - (GADILIDAE) (FOSSIL)
- quadrivittata, Helix quadrivittata J.G. Hidalgo, 1869 - syn of: Solaropsis quadrivittata (J.G. Hidalgo, 1869) - (HELICIDAE)
- quadrivittata, Solaropsis quadrivittata (J.G. Hidalgo, 1869) - (PLEURODONTIDAE)
- quadrivittata, Turritella quadrivittata Phillips, 1829 † - (TURRITELLIDAE) (FOSSIL)
- quadrivolvis, Chloritis quadrivolvis (E.C. Von Martens, 1865) - (CAMAENIDAE)
- quadrivolvis, Straparollus quadrivolvis J.W. Hall, 1856 † - (EUOMPHALIDAE) (FOSSIL)
- quadrivolvis, Helix quadrivolvis E.C. Von Martens, 1865 - syn of: Chloritis quadrivolvis (E.C. Von Martens, 1865) - (HELICIDAE)
- quadrizonalis, Parapholas quadrizonalis G.B. II Sowerby, 1849 - syn of: Parapholas quadrizonata (L. Spengler, 1792) - (PHOLADIDAE)
- quadrizonalis, Dictyoptychus quadrizonalis Özer, 2003 † - (TRECHMANNELLIDAE) (FOSSIL)
- quadrizonata, Parapholas quadrizonata (L. Spengler, 1792) - (PHOLADIDAE)
- Quadrochites, Genus Quadrochites Qian & al., 1979 † (SACHITIDA (UNASSIGNED)) (FOSSIL)
- quadrogonus, Lopochites quadrogonus Z.X. Qian, 1984 † - (SIPHOGONUCHITIDAE) (FOSSIL)
- quadrostrata, Bathyneaera quadrostrata (J. Poutiers, 1984) - (CUSPIDARIIDAE)
- Quadrostrea, Genus Quadrostrea Vialov, 1936 † (OSTREIDAE) (FOSSIL)
- Quadrotheca, Genus Quadrotheca Sysoev , 1958 † (ORTHOTHECIDAE) (FOSSIL)
- quadrula, Modiomorpha quadrula J.W. Hall, 1885 † - (MODIOMORPHIDAE) (FOSSIL)
- quadrula, Ocenebra quadrula É.A. Benoist, 1880 † - (MURICIDAE) (FOSSIL)
- quadrula, Musculus quadrula A.A. Gould, 1861 - syn of: Musculus cupreus (A.A. Gould, 1861) - (MYTILIDAE)
- Quadrula, Genus Quadrula C.S. Rafinesque, 1820 (UNIONIDAE)
- quadrula, Quadrula quadrula C.S. Rafinesque, 1820 - (UNIONIDAE)
- quadrula bullocki, Quadrula quadrula bullocki H.B. Baker, 1928 - syn of: Quadrula quadrula C.S. Rafinesque, 1820 - (UNIONIDAE)
- quadrula contraryensis, Quadrula quadrula contraryensis W.I. Utterback, 1915 - syn of: Quadrula quadrula C.S. Rafinesque, 1820 - (UNIONIDAE)
- Quadrulata, syn of: Genus Elephantulum P.P. Carpenter, 1857 (CAECIDAE)
- quadrulateris, Beichuania quadrulateris H.X. Liu & Gu, 1988 † - (BEICHUANIIDAE) (FOSSIL)
- quadruplator, Turbonilla quadruplator (C.R. Laws, 1940 †) - (PYRAMIDELLIDAE) (FOSSIL)
- quadruplex, Belomitra quadruplex (R.B. Watson, 1882) - (BELOMITRIDAE)
- quadruplex, Clionella quadruplex R.B. Watson, 1882 - syn of: Belomitra quadruplex (R.B. Watson, 1882) - (CLAVATULIDAE)
- quadruplex, Pleurotoma quadruplex R.B. Watson, 1882 - syn of: Belomitra quadruplex (R.B. Watson, 1882) - (TURRIDAE)
- quadruplex conspicienda, Belomitra quadruplex conspicienda É.A.A. Locard, 1897 - (BELOMITRIDAE)
- quadruplex delicatulina, Belomitra quadruplex delicatulina É.A.A. Locard, 1897 - (BELOMITRIDAE)
- quadruplex lyrata, Belomitra quadruplex lyrata É.A.A. Locard, 1897 - (BELOMITRIDAE)
- quadruplex minor, Clionella quadruplex minor É.A.A. Locard, 1897 - syn of: Belomitra quadruplex (R.B. Watson, 1882) - (CLAVATULIDAE)
- quadruplex spelta, Belomitra quadruplex spelta (É.A.A. Locard, 1897) - (BELOMITRIDAE)
- quaelibet, Syrnola quaelibet E. Saurin, 1959 - (PYRAMIDELLIDAE)
- quaelpartensis, Platyrhaphe minutus quaelpartensis H.A. Pilsbry & Y. Hirase, 1908 - (CYCLOPHORIDAE)
- quaeritus, Solecurtus quaeritus M. Huber, 2010 - (SOLECURTIDAE)
- quaesita, Euhadra quaesita (G.P. Deshayes, 1847) - (BRADYBAENIDAE)
- quaesita, Costellaria quaesita J.C. Melvill, 1925 - syn of: Vexillum turriger (L.A. Reeve, 1845) - (COSTELLARIIDAE)
- quaesita, Helix quaesita G.P. Deshayes, 1839 - (HELICIDAE)
- quaesita, Cymbiola quaesita T. Iredale, 1956 - syn of: Cymbiola flavicans (J.F. Gmelin, 1791) - (VOLUTIDAE)
- quaesita heguraensis, Euhadra quaesita heguraensis J.T. Kuroda & N. Tan, 1936 - (BRADYBAENIDAE)
- quaesita montium, Euhadra quaesita montium (E.C. Von Martens, 1879) - (BRADYBAENIDAE)
- quaesita perryi, Euhadra quaesita perryi (G.P. Deshayes, 1851) - (BRADYBAENIDAE)
- Quaesithyria, syn of: Genus Cucumerunio T. Iredale, 1934 (HYRIIDAE)
- quaestio, Testudovolva quaestio C.N. Cate, 1973 - syn of: Testudovolva intricata C.N. Cate, 1973 - (OVULIDAE)
- Quaestiplax, Genus Quaestiplax T. Iredale & A.F.B. Hull, 1929 (CALLOCHITONIDAE)
- quaestor, Conus quaestor J.B.P.A. Lamarck, 1810 - syn of: Trovaoconus venulatus (C.H. Hwass in J.G. Bruguière, 1792) - (CONIDAE)
- quaestuosa, Turbonilla quaestuosa J.C. Melvill, 1910 - (PYRAMIDELLIDAE)
- quaga turrita, Zebra quaga turrita H. Strebel, 1909 - syn of: Orthalicus quagus (H. Strebel, 1909) - (ORTHALICIDAE)
- quagga, Siphocypraea quagga Schilder, 1939 † - syn of: Muracypraea henekeni (J. de C. Sowerby, 1849 †) - (CYPRAEIDAE) (FOSSIL)
- quagga turrita, Zebra quagga turrita H. Strebel, 1909 - syn of: Orthalicus maclurae E.C. Von Martens, 1893 - (ORTHALICIDAE)
- quaggiothei, Lupunovula quaggiothei L. Dolin & J.M. Pacaud, 2009 † - (OVULIDAE) (FOSSIL)
- quaggiottoi, Joculator quaggiottoi A. Cecalupo & I. Perugia, 2012 - (CERITHIOPSIDAE)
- quaggiottoi, Luponovula quaggiottoi L. Dolin & J.M. Pacaud, 2009 † - (EOCYPRAEIDAE) (FOSSIL)
- quaggiottoi, Terebellomimus quaggiottoi J.M. Pacaud, 2008 † - (ROSTELLARIIDAE) (FOSSIL)
- quaggiottoi, Eovoluta quaggiottoi J.M. Pacaud, 2016 † - (VOLUTIDAE) (FOSSIL)
- quagus, Orthalicus quagus (H. Strebel, 1909) - (ORTHALICIDAE)
- qualis, Exiligada qualis T. Iredale, 1939 - (CAMAENIDAE)
- qualteriata, Pararaphistoma qualteriata (von Schlotheim, 1820 †) - (LESUEURILLIDAE) (FOSSIL)
- qualteriata, Raphistoma qualteriata von Schlotheim, 1820 † - syn of: Pararaphistoma qualteriata (von Schlotheim, 1820 †) - (RAPHISTOMATIDAE) (FOSSIL)
- qualteriatum, Raphistoma qualteriatum von Schlotheim, 1820 † - syn of: Pararaphistoma qualteriata (von Schlotheim, 1820 †) - (RAPHISTOMATIDAE) (FOSSIL)
- qualum, Munditiella qualum (C. Hedley, 1899) - (SKENEIDAE)
- quandumpulchellus, Fusinus pulchellus quandumpulchellus M.A. Snyder, 2000 - (FASCIOLARIIDAE)
- quangae, Pyrgiscus quangae E. Saurin, 1959 - (PYRAMIDELLIDAE)
- quangdeense, Lopingoceras quangdeense Shimanskiy 1962 † - (SPYROCERATIDAE) (FOSSIL)
- quangtriensis, Sulcospira quangtriensis F. Köhler, M. Holford, V.T. Do & T.H. Ho, 2009 - (PACHYCHILIDAE)
- quangxiensis, Jedria quangxiensis Pan & Erwin, 2002 † - (NATICOPSIDAE) (FOSSIL)
- quangxiensis, Trachyspira quangxiensis Pan & Erwin, 2002 † - (TRACHYSPIRIDAE) (FOSSIL)
- quantilla, Afriscrobs quantilla (W.H. Turton, 1932) - (ANABATHRIDAE)
- quantilla, Eulima quantilla W.H. Turton, 1932 - syn of: Curveulima icafra (P. Bartsch, 1915) - (EULIMIDAE)
- quantilla, Limopsis quantilla W.H. Turton, 1932 - syn of: Limopsilla pumilio (E.A. Smith, 1904) - (LIMOPSIDAE)
- quantilla, Solariella quantilla W.H. Turton, 1932 - syn of: Afriscrobs quantilla (W.H. Turton, 1932) - (SOLARIELLIDAE)
- quantillum, Homalopoma quantillum (A.A. Gould, 1861) - (COLLONIIDAE)
- quantillum carmineum, Homalopoma quantillum carmineum (P. Bartsch, 1915) - (COLLONIIDAE)
- quantillus, Nassarius quantillus A.A. Gould, 1860 - syn of: Nassarius quantulus (A.A. Gould, 1860) - (NASSARIIDAE)
- quantoana, Tomopleura quantoana M. Yokoyama, 1920 † - (BORSONIIDAE) (FOSSIL)
- quantoana, Parthenina quantoana (S. Nomura, 1937) - (PYRAMIDELLIDAE)
- quantoensis, Lima quantoensis M. Yokoyama, 1920 - (LIMIDAE)
- quantoensis, Siogamaia quantoensis S. Nomura, 1937 - (PYRAMIDELLIDAE)
- quantoensis profunda, Lima quantoensis profunda H. Masahito, J.T. Kuroda & T. Habe, 1971 - (LIMIDAE)
- Quantula, Genus Quantula F.C. Baker, 1941 (DYAKIIDAE)
- quantula, Nassa quantula A.A. Gould, 1860 - syn of: Nassarius quantulus (A.A. Gould, 1860) - (NASSARIIDAE)
- quantula, Raphitoma quantula (G.P. Deshayes, 1889 †) - (RAPHITOMIDAE) (FOSSIL)
- quantula, Truncatellina quantula (J.C. Melvill & J.H. Ponsonby, 1893) - (VERTIGINIDAE)
- Quantulopinna, Genus Quantulopinna T. Iredale, 1939 (PINNIDAE)
- quantulus, Nassarius quantulus (A.A. Gould, 1860) - (NASSARIIDAE)
- quanzae, Galatea quanzae (De Brito Capello, 1878) - (DONACIDAE)
- quarantellii, Rissoa quarantellii M.M. Brunetti & G. Vecchi, 2005 † - (RISSOIDAE) (FOSSIL)
- quarispinosa, Coelacanthia quarispinosa N.I. Andrusov, 1890 † - (HYDROBIIDAE) (FOSSIL)
- quarki, Mesocoelia quarki Tassell, 1982 † - (MURCHISONIIDAE) (FOSSIL)
- Quarkia, Genus Quarkia M.J. Faber, 2009 (RISSOIDAE)
- quarlesi, Chesaclava quarlesi E.J. Petuch, 1988 † - (TURRIDAE) (FOSSIL)
- quarta, Tournouerina quarta Schlickum, 1977 † - (HYDROBIIDAE) (FOSSIL)
- quarta, Nesiodostomia quarta (H.A. Pilsbry, 1918) - (PYRAMIDELLIDAE)
- quartus, Anabathron quartus (C.R. Laws, 1950 †) - (ANABATHRIDAE) (FOSSIL)
- quartzitica, Cyrtodonta quartzitica Frech, 1891 † - (CYRTODONTIDAE) (FOSSIL)
- quarunensis, Bernaya quarunensis Abbass, 1967 † - (CYPRAEIDAE) (FOSSIL)
- Quasianthraconauta, Genus Quasianthraconauta Betekhtina, 1988 † (NAIADITIDAE) (FOSSIL)
- quasicapillaria, Dictyotomaria quasicapillaria Rollins, 1975 † - (GOSSELETINIDAE) (FOSSIL)
- Quasiconus, Genus Quasiconus J.K. Tucker & M.J. Tenorio, 2009 (CONIDAE)
- Quasicorambe, syn of: Genus Corambe L.S.R. Bergh, 1869 (CORAMBIDAE)
- Quasicravenoceras, Genus Quasicravenoceras Ruzhentsev & Bogoslovskaya, 1971 † (CRAVENOCERATIDAE) (FOSSIL)
- quasicylindrica, Pyrgulina quasicylindrica Peñas & Rolán, 2017 - (PYRAMIDELLIDAE)
- quasilaevis, Metula quasilaevis B.M. Landau, F. Da Silva & S.M. Heitz, 2016 † - (BUCCINIDAE) (FOSSIL)
- quasilla, Nipponaphera quasilla (R.E. Petit, 1987) - (CANCELLARIIDAE)
- quasilla, Cancellaria quasilla R.E. Petit, 1987 - syn of: Nipponaphera quasilla (R.E. Petit, 1987) - (CANCELLARIIDAE)
- quasillus, Costellaria quasillus T. Iredale, 1929 - syn of: Vexillum obeliscus (L.A. Reeve, 1844) - (COSTELLARIIDAE)
- quasillus, Rissoina quasillus J.C. Melvill & R. Standen, 1896 - (RISSOINIDAE)
- Quasilucina, syn of: Genus Linga A. De Gregorio, 1884 (LUCINIDAE)
- quasimacoma, Moerella quasimacoma C.J.S. Hickman, 2015 † - (TELLINIDAE) (FOSSIL)
- quasimagnificus, Conus quasimagnificus A.J. Da Motta, 1982 - syn of: Darioconus pennaceus (I. von Born, 1778) - (CONIDAE)
- quasimagus, Pionoconus quasimagus L. Bozzetti, 2016 - (CONIDAE)
- quasimodo, Rissoina quasimodo M.J. Faber, 2013 - (RISSOINIDAE)
- quasimodoides, Sinum quasimodoides R.N. Kilburn, 1976 - (NATICIDAE)
- Quasintoceras, Genus Quasintoceras Kuzina, 1974 † (INTOCERATIDAE) (FOSSIL)
- quasinuda, Homalopoma quasinuda A.E.M. Cossmann & G. Pissarro † - (COLLONIIDAE) (FOSSIL)
- quasirectum, Rizoceras quasirectum Barrande † - (ONCOCERATIDAE) (FOSSIL)
- Quasisimnia, Genus Quasisimnia F.Jr. Lorenz & D. Fehse, 2009 (OVULIDAE)
- Quasisinuites, Genus Quasisinuites Horný , 1997 † (CYRTOLITIDAE) (FOSSIL)
- Quassisipho, Genus Quassisipho † (NEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- quatericingulata, Paracingulina quatericingulata (S. Nomura, 1938) - (PYRAMIDELLIDAE)
- quaternatum, Hispanipoma quaternatum (J.B.P.A. Lamarck) - (POMATIIDAE)
- quaternatum cabaretense, Hispanipoma quaternatum cabaretense P. Bartsch, 1946 - (POMATIIDAE)
- quaternatum charmettense, Hispanipoma quaternatum charmettense P. Bartsch, 1946 - (POMATIIDAE)
- quaternatum dentilobatum, Hispanipoma quaternatum dentilobatum (C.D. Weinland) - (POMATIIDAE)
- quaternatum monticolum, Hispanipoma quaternatum monticolum P. Bartsch, 1946 - (POMATIIDAE)
- quaternatum nodulatum, Hispanipoma quaternatum nodulatum F. Poey, 1851 - syn of: Rhytidopoma nodulatum (F. Poey, 1851) - (POMATIIDAE)
- quaterstriata, Clathropsis quaterstriata A. Cecalupo & I. Perugia, 2012 - (CERITHIOPSIDAE)
- quatrefagesi, Facelina quatrefagesi A.J.B.M. Vayssière, 1888 - (FACELINIDAE)
- quatrefortis, Gibberula quatrefortis T. McCleery, 2008 - (CYSTISCIDAE)
- quatsinoensis, Ascetoaxinus quatsinoensis P.G. Oliver & M.A. Frey, 2014 - (THYASIRIDAE)
- quayensis, Plicatula quayensis B.S. Kues, 1997 † - (PLICATULIDAE) (FOSSIL)
- quaylei, Lyonsiella quaylei F.R. Bernard, 1969 - (LYONSIELLIDAE)
- quaylei, Simnia quaylei Loewe, 1935 - syn of: Simnia arcuata (L.A. Reeve, 1865) - (OVULIDAE)
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