- 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)
- 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)
- 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)
- 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 Frýda & 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)
- 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 (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, Koreanaia yunnanensis H. Guo, 1981 † - (TRIGONIOIDIDAE) (FOSSIL)
- yunnanensis, Dimorphotectus yunnanensis Pan, 1977 † - (TROCHIDAE) (FOSSIL)
- yunnanensis, Lioplacodes yunnanensis Yu & Xi, 1977 † - (VIVIPARIDAE) (FOSSIL)
- yunnanensis, Cipangopaludina yunnanensis Zhang, H.X. Liu & Wang, 1981 - (VIVIPARIDAE)
- 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)
- 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, 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)
- Yvania, syn of: Genus Baylea de Koninck, 1881 † (GOSSELETINIDAE) (FOSSIL)
- Yvaniella, Genus Yvaniella Milovanovic, 1938 † (HIPPURITIDAE) (FOSSIL)
- yvanii, Baylea yvanii (Léveillé, 1835 †) - (GOSSELETINIDAE) (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 (D'Orbigny, 1835) - (PLANORBIDAE)
- yzabalensis, Nephronaias yzabalensis (J.C.H. Crosse & P.H. Fischer, 1892) - (UNIONIDAE)
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