- yotokurensis, Turbonilla yotokurensis S. Nomura, 1938 - (PYRAMIDELLIDAE)
- yotsukurensis, Leionucula yotsukurensis K. Hirayama, 1958 † - (NUCULIDAE) (FOSSIL)
- yotukurensis, Pyrgiscus yotukurensis (S. Nomura, 1938) - (PYRAMIDELLIDAE)
- yotukurensis, Pyrgiscilla yotukurensis S. Nomura, 1938 - syn of: Pyrgiscus yotukurensis (S. Nomura, 1938) - (PYRAMIDELLIDAE)
- youcanensis, Anodonta youcanensis F. Paetel, 1890 - syn of: Anodonta beringiana (A.T. von Middendorff, 1851) - (UNIONIDAE)
- youconensis, Anodonta youconensis I. Lea, 1867 - syn of: Anodonta beringiana (A.T. von Middendorff, 1851) - (UNIONIDAE)
- youkamensis, Anodon youkamensis G.B. Sowerby, 1870 - syn of: Anodonta beringiana (A.T. von Middendorff, 1851) - (UNIONIDAE)
- youkanensis, Anodonta youkanensis I. Lea, 1867 - syn of: Anodonta beringiana (A.T. von Middendorff, 1851) - (UNIONIDAE)
- youkonensis, Beringiana youkonensis F. Zatrawkin, 1983 - syn of: Anodonta beringiana (A.T. von Middendorff, 1851) - (UNIONIDAE)
- youngbleuthi, Chromodoris youngbleuthi E.A. Kay & A.T. Young, 1969 - syn of: Glossodoris rufomarginata (L.S.R. Bergh, 1890) - (CHROMODORIDIDAE)
- youngi, Cominella youngi A.W.B. Powell, 1940 - (BUCCINIDAE)
- youngi, Venustatrochus youngi B.A. Marshall, 2016 - (CALLIOSTOMATIDAE)
- youngi, Maoricrypta youngi Powell, 1940 - (CALYPTRAEIDAE)
- youngi, Sinployea youngi (A. Garrett, 1872) - (CHAROPIDAE)
- youngi, Chondrodonta youngi P.H. Scott, 2007 † - (CHONDRODONTIDAE) (FOSSIL)
- youngi, Ctenodonta youngi Pojeta & Gilbert-Tomlinson, 1977 † - (CTENODONTIDAE) (FOSSIL)
- youngi, Cyclophorus exaltatus youngi T.C. Yen, 1936 - (CYCLOPHORIDAE)
- youngi, Cyrtolites youngi Foerste, 1889 † - syn of: Zonidiscus youngi (Foerste, 1889 †) - (CYRTOLITIDAE) (FOSSIL)
- youngi, Doto youngi T.E. Thompson, 1972 - syn of: Doto yongei T.E. Thompson, 1972 - (DOTIDAE)
- youngi, Amaea youngi R.N. Kilburn, 1985 - (EPITONIIDAE)
- youngi, Cirsotrema youngi J. Marwick, 1928 † - (EPITONIIDAE) (FOSSIL)
- youngi, Xenoceltites youngi Kummel & Steele, 1962 † - (KASHMIRITIDAE) (FOSSIL)
- youngi, Metadagnoceras youngi Bucher, 1989 † - (KHVALYNITIDAE) (FOSSIL)
- youngi, Glabella youngi (R.N. Kilburn, 1977) - (MARGINELLIDAE)
- youngi, Marginella youngi R.N. Kilburn, 1977 - syn of: Glabella youngi (R.N. Kilburn, 1977) - (MARGINELLIDAE)
- youngi, Lepsithais youngi H.J. Finlay, 1928 - syn of: Haustrum lacunosum (J.G. Bruguière, 1789) - (MURICIDAE)
- youngi, Natica youngi C.J. Maury, 1917 † - (NATICIDAE) (FOSSIL)
- youngi, Plicatula youngi A.C. Chapman, 1922 † - (PLICATULIDAE) (FOSSIL)
- youngi, Notocrater youngi J.H. McLean & M.G. Harasewych, 1995 - (PSEUDOCOCCULINIDAE)
- youngi, Ptychatractus youngi R.N. Kilburn, 1975 - (PTYCHATRACTIDAE)
- youngi, Odostomia youngi W.H. Dall & P. Bartsch, 1910 - (PYRAMIDELLIDAE)
- youngi, Zonidiscus youngi (Foerste, 1889 †) - (TROPIDODISCIDAE) (FOSSIL)
- youngi, Hypoturrilites youngi Clark, 1965 † - (TURRILITIDAE) (FOSSIL)
- youngi cocleana, Natica youngi cocleana A.A. Olsson, 1922 - (NATICIDAE)
- youngiana, Murchisonia youngiana J. Donald, 1895 † - syn of: Hypergonia vermicula (J.W. Hall, 1856 †) - (MURCHISONIIDAE) (FOSSIL)
- youngiana, Hypergonia youngiana J. Donald, 1895 † - (ORTHONEMIDAE) (FOSSIL)
- youngianum, Orthonema youngianum J. Donald, 1889 † - (ORTHONEMATIDAE) (FOSSIL)
- Youngibelus, Genus Youngibelus Riegraf, 1980 (BELEMNITIDA (UNASSIGNED)) (FOSSIL)
- Youngicaprina, Genus Youngicaprina Mitchell , 2013 (CAPRINULOIDEIDAE) (FOSSIL)
- youngorum, Walvisteuthis youngorum (K.S. Bolstad, 2010) - (ONYCHOTEUTHIDAE)
- youngorum, Callimachus youngorum K.S. Bolstad, 2010 - syn of: Walvisteuthis youngorum (K.S. Bolstad, 2010) - (ONYCHOTEUTHIDAE)
- youngquisti, Winnipegoceras youngquisti Flower, 1952 † - (WESTONOCERATIDAE) (FOSSIL)
- youssefi, Amplogladius youssefi Abbass, 1967 † - (ROSTELLARIIDAE) (FOSSIL)
- youssiana, Xerosecta euphorcella youssiana (P.M. Pallary, 1927) - (HYGROMIIDAE)
- Youwanjela, Genus Youwanjela F. Kφhler & M. Shea, 2012 (CAMAENIDAE)
- youxiaensis, Palaeomya youxiaensis Wen 1976 † - (CARDIIDA (UNASSIGNED)) (FOSSIL)
- youxiaensis, Iotrigonia youxiaensis Wen & T.C. Lan, 1976 † - (IOTRIGONIIDAE) (FOSSIL)
- youyangensis, Tricula youyangensis Y.Y. Liu, Y.X. Wang & W.Z. Zhang, 1991 - (POMATIOPSIDAE)
- yoyo, Divariscintilla yoyo P.M. Mikkelsen & R. Bieler, 1989 - (GALEOMMATIDAE)
- yoyottei, Sveltia yoyottei R.E. Petit & M.G. Harasewych, 1990 - (CANCELLARIIDAE)
- yoyottei, Cantrainea yoyottei C. Vilvens, 2001 - (COLLONIIDAE)
- yporanganus, Megalobulimus yporanganus (H.A. Pilsbry & H.F.A. von Ihering, 1901) - (MEGALOBULIMIDAE)
- ypresiana, Melanatria ypresiana R. Vega & Perilliat, 1992 † - (PACHYCHILIDAE) (FOSSIL)
- ypsilon, Macedonica ypsilon H. Nordsieck, 1977 - (CLAUSILIIDAE)
- ypsilonptyx, Thaumatoptyx ypsilonptyx H. Nordsieck, 2003 - (CLAUSILIIDAE)
- yragoae, Schwartziella yragoae E. Rolán & J.M. Hernández, 2003 - (ZEBINIDAE)
- yrigoyeni, Crioceratites yrigoyeni H.A. Leanza, 1970 † - (CRIOCERATITIDAE) (FOSSIL)
- ysbryda, Selenochlamys ysbryda B. Rowson & B. Symondson, 2008 - (TRIGONOCHLAMYDIDAE)
- ytomitai, Chrysallida ytomitai S. Nomura, 1938 - (PYRAMIDELLIDAE)
- yuani, Waagenella yuani Yin, 1932 † - (BELLEROPHONTIDAE) (FOSSIL)
- yuani, Macroscaphites yuani Puzos, 1831 † - (MACROSCAPHITIDAE) (FOSSIL)
- yuani, Nuculopsis yuani Chao, 1927 † - (NUCULIDAE) (FOSSIL)
- yuanmouensis, Homo erectus yuanmouensis Li & al., 1977 † - (Hominidae) (FOSSIL)
- yuati, Beyrichites yuati Skwarko, 1973 † - (BEYRICHITIDAE) (FOSSIL)
- yubaensis, Alasmodon yubaensis J.B. Trask, 1855 - syn of: Margaritifera falcata (A.A. Gould, 1850) - (UNIONIDAE)
- yubarense, Yubariceras yubarense (E. Matsumoto & al., 1957 †) - (ACANTHOCERATIDAE) (FOSSIL)
- yubarensis, Parvamussium cowperi yubarensis Yabe & T. Nagao, 1928 † - (PROPEAMUSSIIDAE) (FOSSIL)
- Yubariceras, Subgenus Romaniceras (Yubariceras) Zaborski, 1990 (ACANTHOCERATIDAE) (FOSSIL)
- yucatanea, Helix yucatanea P.M.A. Morelet, 1849 - syn of: Polygyra yucatanea (P.M.A. Morelet, 1849) - (HELICIDAE)
- yucatanea, Polygyra yucatanea (P.M.A. Morelet, 1849) - (POLYGYRIDAE)
- yucatanea helictomphala, Polygyra yucatanea helictomphala L. Pfeiffer, 1856 - syn of: Polygyra yucatanea (P.M.A. Morelet, 1849) - (POLYGYRIDAE)
- yucatanensis, Achatina yucatanensis L. Pfeiffer, 1846 - syn of: Cosmomenus cylindracea (B. Phillips, 1846) - (ACHATINIDAE)
- yucatanensis, Ampullaria yucatanensis P.H. Fischer & J.C.H. Crosse, 1890 - syn of: Pomacea flagellata (T. Say, 1829) - (AMPULLARIIDAE)
- yucatanensis, Euglandina yucatanensis L. Pfeiffer, 1846 - syn of: Cosmomenus cylindracea (B. Phillips, 1846) - (SPIRAXIDAE)
- yucatanensis, Glandina yucatanensis L. Pfeiffer, 1846 - syn of: Cosmomenus cylindracea (B. Phillips, 1846) - (SPIRAXIDAE)
- yucatanensis, Leptopeas yucatanensis (H.A. Pilsbry, 1907) - (SUBULINIDAE)
- yucatanensis, Leptinaria yucatanensis H.A. Pilsbry, 1907 - syn of: Leptopeas yucatanensis (H.A. Pilsbry, 1907) - (SUBULINIDAE)
- yucatanensis, Haplocion yucatanensis (P. Bartsch, 1906) - (UROCOPTIDAE)
- yucatanensis izabelensis, Ampullaria yucatanensis izabelensis E.C. Von Martens, 1899 - syn of: Pomacea flagellata (T. Say, 1829) - (AMPULLARIIDAE)
- yucatecana, Cerodrillia yucatecana P.J. Fallon, 2016 - (DRILLIIDAE)
- yucatecana, Marginella yucatecana W.H. Dall, 1881 - syn of: Dentimargo yucatecanus (W.H. Dall, 1881) - (MARGINELLIDAE)
- yucatecana, Prunum yucatecana W.H. Dall, 1881 - syn of: Dentimargo yucatecanus (W.H. Dall, 1881) - (MARGINELLIDAE)
- yucatecana, Mathilda yucatecana (W.H. Dall, 1881) - (MATHILDIDAE)
- yucatecana, Turritella yucatecana W.H. Dall, 1881 - (TURRITELLIDAE)
- yucatecanum, Calliostoma yucatecanum W.H. Dall, 1881 - (CALLIOSTOMATIDAE)
- yucatecanus, Dentimargo yucatecanus (W.H. Dall, 1881) - (MARGINELLIDAE)
- yucatense, Sphaerium yucatense J.C.H. Crosse & P.H. Fischer, 1894 - syn of: Eupera singleyi (H.A. Pilsbry, 1889) - (SPHAERIIDAE)
- yucatensis, Holospira yucatensis P. Bartsch, 1906 - (UROCOPTIDAE)
- yucayum, Chondropoma yucayum (Presas in L. Pfeiffer, 1863) - (POMATIIDAE)
- yucayum bermudezi, Chondropoma yucayum bermudezi C. de la Torre & Sánchez De Fuentes, 1954 - (POMATIIDAE)
- yucola, Steatonenia hemmeni yucola H. Nordsieck, 2005 - (CLAUSILIIDAE)
- yudaensis, Ancistrolepis yudaensis Y. Otuka, 1934 † - (BUCCINIDAE) (FOSSIL)
- yudaensis, Cardilia yudaensis Y. Otuka, 1934 † - (CARDILIIDAE) (FOSSIL)
- yudinae, Linguatornoceras yudinae Becker & House, 2000 † - (TORNOCERATIDAE) (FOSSIL)
- yueliangpingensis, Plicatula yueliangpingensis C. Chen, 1976 † - (PLICATULIDAE) (FOSSIL)
- yueyingae, Lanceolaria yueyingae J. He & Z. Zhuang, 2013 - (UNIONIDAE)
- yuhangense, Proendoceras yuhangense Zou, 1987 † - (PROTEROCAMEROCERATIDAE) (FOSSIL)
- yuhitai, Mokumea yuhitai T. Habe, 1991 - (COLUMBELLIDAE)
- yuhsiuae, Vokesimurex yuhsiuae R. Houart, 2014 - (MURICIDAE)
- yuigahamana, Odostomia yuigahamana S. Nomura, 1938 - (PYRAMIDELLIDAE)
- yukiae, Antiplanes yukiae (T. Shikama, 1962) - (PSEUDOMELATOMIDAE)
- yukiae, Rectiplanes yukiae T. Shikama, 1962 - syn of: Antiplanes yukiae (T. Shikama, 1962) - (PSEUDOMELATOMIDAE)
- yukiangense, Meekoceras yukiangense Chao, 1959 † - syn of: Submeekoceras hsuyuchieni (Chao, 1959 †) - (MEEKOCERATIDAE) (FOSSIL)
- yukikoae, Calliotropis yukikoae G.T. Poppe, S.P. Tagaro & H. Dekker, 2006 - (CALLIOTROPIDAE)
- yukikoae, Megastomia yukikoae (S. Nomura, 1938) - (PYRAMIDELLIDAE)
- yukitai, Hemizaptyx yukitai (S. Uozumi & A. Yamamoto, 1993.) - (CLAUSILIIDAE)
- yukitai, Anachis yukitai T. Habe, 1991 - (COLUMBELLIDAE)
- yukitai, Aperiovula yukitai M. Azuma, 1974 - syn of: Pseudosimnia pyrulina (A. Adams, 1854) - (OVULIDAE)
- yukitai, Gafrarium yukitai T. Habe, 1977 - syn of: Gafrarium barandae (J.G. Hidalgo, 1885) - (VENERIDAE)
- yukonensis, Epiceratites yukonensis Tozer, 1994 † - (APLOCOCERATIDAE) (FOSSIL)
- yukonensis, Entolium yukonensis Smith, 1927 † - (ENTOLIIDAE) (FOSSIL)
- yukonensis, Gnomohalorites yukonensis Tozer, 1979 † - (HALORITIDAE) (FOSSIL)
- yukonensis, Tozeria yukonensis Tozer, 1994 † - (METASIBIRITIDAE) (FOSSIL)
- yukonensis, Vaugonia yukonensis Poulton, 1979 † - (MYOPHORELLIDAE) (FOSSIL)
- yukonensis, Lywea yukonensis Aberhan, 1998 † - (NEITHEIDAE) (FOSSIL)
- yukonensis, Porcellia yukonensis Frýda & al., 2008 † - (PORCELLIIDAE) (FOSSIL)
- yukonensis, Nannosteinmannites yukonensis Tozer, 1994 † - (STEINMANNITIDAE) (FOSSIL)
- yukonensis, Semitubina yukonensis Blodgett & al., 2001 † - (TUBINIDAE) (FOSSIL)
- Yukonoconcha, Genus Yukonoconcha Frύda & al., 2002 (CRASSIMARGINATIDAE) (FOSSIL)
- Yuku, Genus Yuku Kruse, 2002 (ANGUSTICORNIDAE) (FOSSIL)
- yulei, Marylnessa yulei (E. Forbes, 1851) - (CAMAENIDAE)
- yulei, Sphaerospira yulei E. Forbes, 1851 - syn of: Marylnessa yulei (E. Forbes, 1851) - (CAMAENIDAE)
- yulei compacta, Marylnessa yulei compacta (E. Forbes, 1851) - (CAMAENIDAE)
- yuleianus, Leptoconus yuleianus Noetling, 1901 † - (CONIDAE) (FOSSIL)
- yulensis, Rhynchotrochus taylorianus yulensis (J.W. Brazier, 1876) - (CAMAENIDAE)
- yulinensis, Grandinenia yulinensis H. Nordsieck, 2012 - (CLAUSILIIDAE)
- yulinensis, Palaeomutela yulinensis Liang † - (PALAEOMUTELIDAE) (FOSSIL)
- yulini, Vexillum yulini S.I. Huang, 2017 - (COSTELLARIIDAE)
- yuluensis, Bemella yuluensis Yü, 1979 † - syn of: Securiconus simplex (Yü, 1979 †) - (HELCIONELLIDAE) (FOSSIL)
- yuluensis, Tubatoconus yuluensis S.Y. Feng & al., 2000 † - (TRENELLIDAE) (FOSSIL)
- yumaensis, Cerion yumaensis H.A. Pilsbry & E.G. Vanatta, 1895 - (CERIONIDAE)
- yumaensis saona, Cerion yumaensis saona E.G. Vanatta, 1924 - (CERIONIDAE)
- yumimarumai, Babelomurex yumimarumai S. Kosuge, 1985 - (MURICIDAE)
- yumotoensis, Lima yumotoensis M. Yokoyama, 1924 - (LIMIDAE)
- yumuriense, Chondropoma pictum yumuriense C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- yumuriensis, Annularisca yumuriensis C. de la Torre & P. Bartsch, 1941 - (POMATIIDAE)
- yumurinus, Murex yumurinus H. Sarasúa & J. Espinosa, 1978 - syn of: Siratus ciboney (W.J. Clench & I. Pérez Farfante, 1945) - (MURICIDAE)
- yungasensis, Drymaeus yungasensis (A.V.M.D. D'Orbigny, 1837) - (BULIMULIDAE)
- yunguensis, Annularia yunguensis (L. Pfeiffer) - (POMATIIDAE)
- yunguensis, Pleurostemma perplicata yunguensis C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- yunkaxi, Volvarina yunkaxi J. Espinosa & J.A. Ortea, 2015 - (MARGINELLIDAE)
- yunlongensis, Amnicola yunlongensis Pan, 1977 † - (AMNICOLIDAE) (FOSSIL)
- yunlongensis, Bithynia yunlongensis Pan, 1977 † - (BITHYNIIDAE) (FOSSIL)
- yunlongensis, Opeas yunlongensis Pan, 1977 † - (SUBULINIDAE) (FOSSIL)
- yunnancola, Euphaedusa yunnancola H. Nordsieck, 2001 - (CLAUSILIIDAE)
- yunnancola, Garnieria mouhoti yunnancola H. Nordsieck, 2012 - (CLAUSILIIDAE)
- yunnanensis, Amnicola yunnanensis Pan, 1977 † - (AMNICOLIDAE) (FOSSIL)
- yunnanensis, Anadenus yunnanensis A. Wiktor, C. De-niu & W. Ming, 2000 - (ANADENIDAE)
- yunnanensis, Aviculopecten yunnanensis H. Guo, 1985 † - (AVICULOPECTINIDAE) (FOSSIL)
- yunnanensis, Lufengospira yunnanensis Yu & Xi, 1977 † - (BITHYNIIDAE) (FOSSIL)
- yunnanensis, Sororcula yunnanensis Pan, 1977 † - (CIRRIDAE) (FOSSIL)
- yunnanensis, Timorites yunnanensis Liang, 1983 † - (CYCLOLOBIDAE) (FOSSIL)
- yunnanensis, Corbicula yunnanensis G. Nevill, 1877 - syn of: Corbicula fluminea (O.F. Müller, 1774) - (CYRENIDAE)
- yunnanensis, Halobia yunnanensis Reed, 1927 † - (HALOBIIDAE) (FOSSIL)
- yunnanensis, Helcionella yunnanensis Zhang & Babcock, 2002 † - (HELCIONELLIDAE) (FOSSIL)
- yunnanensis, Akiyoshia yunnanensis (Y.Y. Liu, Y.X. Wang & W.Z. Zhang, 1982) - (HYDROBIIDAE)
- yunnanensis, Saganoa yunnanensis Y.Y. Liu, Y.X. Wang & W.Z. Zhang, 1982 - syn of: Akiyoshia yunnanensis (Y.Y. Liu, Y.X. Wang & W.Z. Zhang, 1982) - (HYDROBIIDAE)
- yunnanensis, Ectomaria yunnanensis Mansuy, 1919 † - syn of: Micrentoma yunnanensis (Mansuy, 1919 †) - (LOPHOSPIRIDAE) (FOSSIL)
- yunnanensis, Galba yunnanensis Pan, 1977 † - (LYMNAEIDAE) (FOSSIL)
- yunnanensis, Tambanella yunnanensis H. Guo, 1985 † - (MALLEIDAE) (FOSSIL)
- yunnanensis, Paladilhia yunnanensis Y.Y. Liu, Y.X. Wang & W.Z. Zhang, 1980 - (MOITESSIERIIDAE)
- yunnanensis, Minymerisma yunnanensis (Yu & Xi, 1977 †) - (MOLLUSCA INCERTAE SEDIS) (FOSSIL)
- yunnanensis, Micrentoma yunnanensis (Mansuy, 1919 †) - (MURCHISONIIDAE) (FOSSIL)
- yunnanensis, Gervillia yunnanensis C. Chen, 1976 † - (MYALINIDAE) (FOSSIL)
- yunnanensis, Mysidiella yunnanensis Zhang, 1985 † - (MYSIDIELLIDAE) (FOSSIL)
- yunnanensis, Volsellina yunnanensis (Reed, 1927 †) - (MYTILIDAE) (FOSSIL)
- yunnanensis, Modiolus yunnanensis C. Chen, 1976 † - (MYTILIDAE) (FOSSIL)
- yunnanensis, Trigonodus yunnanensis (H. Guo, 1985 †) - (PACHYCARDIIDAE) (FOSSIL)
- yunnanensis, Brotia yunnanensis F. Köhler, L.N. Du & J. Yang, 2010 - (PACHYCHILIDAE)
- yunnanensis, Palaeanodonta yunnanensis H. Guo, 1985 † - (PALAEANODONTIDAE) (FOSSIL)
- yunnanensis, Gudeodiscus yunnanensis B. Páll-Gergely, 2013 - (PLECTOPYLIDAE)
- yunnanensis, Discotoma yunnanensis Pan, 1977 † - (PLEUROTOMARIIDAE) (FOSSIL)
- yunnanensis, Lacunopsis yunnanensis Y.Y. Liu, Y.X. Wang & W.Z. Zhang, 1980 - (POMATIOPSIDAE)
- yunnanensis, Zaibinkangia yunnanensis Y.Y. Liu, Y.X. Wang & W.Z. Zhang, 1982 - syn of: Akiyoshia yunnanensis (Y.Y. Liu, Y.X. Wang & W.Z. Zhang, 1982) - (POMATIOPSIDAE)
- yunnanensis, Anulifera yunnanensis Pan, 1977 † - (PROTORCULIDAE) (FOSSIL)
- yunnanensis, Pseudomonotis yunnanensis Yin & Hsu, 1937 † - syn of: Claraia radialis Leonardi, 1935 † - (PSEUDOMONOTIDAE) (FOSSIL)
- yunnanensis, Plocezyga yunnanensis Pan & Erwin, 2002 † - (PSEUDOZYGOPLEURIDAE) (FOSSIL)
- yunnanensis, Claraia yunnanensis Leonardi, 1935 † - syn of: Claraia radialis Leonardi, 1935 † - (PTERINOPECTINIDAE) (FOSSIL)
- yunnanensis, Heraultipegma yunnanensis He & Yang, 1982 † - syn of: Watsonella crosbyi A.W. Grabau, 1900 † - (STENOTHECIDAE) (FOSSIL)
- yunnanensis, Paratibetites yunnanensis Liang, 1977 † - (TIBETITIDAE) (FOSSIL)
- yunnanensis, Protrigonia yunnanensis (Guo Fu-xiang, 1985) † - (TRIGONIIDAE) (FOSSIL)
- yunnanensis, Koreanaia yunnanensis H. Guo, 1981 † - (TRIGONIOIDIDAE) (FOSSIL)
- yunnanensis, Dimorphotectus yunnanensis Pan, 1977 † - (TROCHIDAE) (FOSSIL)
- yunnanensis, Cipangopaludina yunnanensis Zhang, H.X. Liu & Wang, 1981 - (VIVIPARIDAE)
- yunnanensis, Lioplacodes yunnanensis Yu & Xi, 1977 † - (VIVIPARIDAE) (FOSSIL)
- yunnanensis, Zygopleura yunnanensis Pan, 1977 † - (ZYGOPLEURIDAE) (FOSSIL)
- Yunnania, Genus Yunnania Mansuy , 1912 (ARAEONEMATIDAE) (FOSSIL)
- yunnania, Paragoniozona yunnania Batten, 1972 † - (PHYMATOPLEURIDAE) (FOSSIL)
- Yunnanomya, Subgenus Osteomya (Yunnanomya) Guo, 1985 (PHOLADOMYIDAE) (FOSSIL)
- Yunnanopleura, Genus Yunnanopleura Yu, 1987 (MAIKHANELLIDAE) (FOSSIL)
- Yunnanoredonia, Genus Yunnanoredonia Fang & Cope 2004 (REDONIIDAE) (FOSSIL)
- Yunquea, Genus Yunquea F.C. Baker, 1940 (SAGDIDAE)
- yunquei, Chondropoma yunquei H.B. Baker, 1941 - (POMATIIDAE)
- yunquense, Farcimen yunquense C. de la Torre & P. Bartsch, 1942 - (MEGALOMASTOMIDAE)
- yunquensis, Annularisca yunquensis (L. Pfeiffer, 1860) - (POMATIIDAE)
- yunshanensis, Thracia yunshanensis Yu & Li - syn of: Thracia shokawensis I. Hayami, 1959 - (THRACIIDAE)
- yunusi, Sulawesidrobia yunusi S. Zielske, M. Glaubrecht & M. Haase, 2011 - (HYDROBIIDAE)
- yuraensis, Zafra yuraensis S. Nomura & N. Zinbo, 1940 - syn of: Zafra mitriformis A. Adams, 1860 - (COLUMBELLIDAE)
- yurihookeri, Pontohedyle yurihookeri K.M. Jörger & M. Schrödl, 2013 - (PARHEDYLIDAE)
- yurii, Kolymia yurii Astaf'yeva, 1987 † - (KOLYMIIDAE) (FOSSIL)
- yurii, Scabrotrophon yurii (R.V. Egorov, 1994) - (MURICIDAE)
- yurikantori, Hemifusus yurikantori Thach, 2017 - (MELONGENIDAE)
- yurikantori, Gregoia yurikantori D. Fehse, 2015 - (TRIVIIDAE)
- yurkynensis, Kerchia yurkynensis K. Bandel, 2010 † - (HYDROBIIDAE) (FOSSIL)
- yushuensis, Subvishnuites yushuensis Wang & C. Chen, 1979 † - (INYOITIDAE) (FOSSIL)
- yusufelensis, Turanena yusufelensis E. Gittenberger & H.P.M.G. Menkhorst, 1993 - (ENIDAE)
- Yuwenia, Genus Yuwenia Runnegar, 1981 (ONYCHOCHILIDAE) (FOSSIL)
- yvani, Macroscaphites yvani (Puzos, 1832 †) - (MACROSCAPHITIDAE) (FOSSIL)
- yvani disjuncticostatus, Macroscaphites yvani disjuncticostatus Kakabadze & Thieuloy, 1991 † - (MACROSCAPHITIDAE) (FOSSIL)
- Yvania, syn of: Genus Baylea de Koninck, 1881 (GOSSELETINIDAE) (FOSSIL)
- Yvaniella, Genus Yvaniella Milovanovic, 1938 (HIPPURITIDAE) (FOSSIL)
- yvanii, Baylea yvanii (Léveillé, 1835 †) - (GOSSELETINIDAE) (FOSSIL)
- yvanii, Scaphites yvanii Puzos, 1832 † - syn of: Macroscaphites yvani (Puzos, 1832 †) - (SCAPHITIDAE) (FOSSIL)
- Yvesgalleticeras, Genus Yvesgalleticeras Guex & al., 2005 (COLUMBITIDAE) (FOSSIL)
- yvonnae, Pyrgiscus yvonnae (E. Saurin, 1959) - (PYRAMIDELLIDAE)
- yzabalensis, Drepanotrema yzabalensis J.C.H. Crosse & P.H. Fischer, 1880 - syn of: Drepanotrema anatinum (A.V.M.D. D'Orbigny, 1835) - (PLANORBIDAE)
- yzabalensis, Nephronaias yzabalensis (J.C.H. Crosse & P.H. Fischer, 1892) - (UNIONIDAE)
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