n = 257
| Scientific Name | Author | Valid Name | Family | English Name |
|---|---|---|---|---|
| Astyanax abramis | (Jenyns, 1842) | Astyanax abramis | Characidae | |
| Astyanax abramoides | Eigenmann, 1909 | Jupiaba abramoides | Characidae | |
| Astyanax acanthogaster | (Eigenmann, 1911) | Jupiaba acanthogaster | Characidae | |
| Astyanax acatlanensis | Schmitter-Soto, 2017 | Astyanax acatlanensis | Characidae | |
| Astyanax aeneus | (Günther, 1860) | Astyanax aeneus | Characidae | Banded tetra |
| Astyanax aeneus costaricensis | Meek, 1914 | Psalidodon fasciatus | Characidae | Banded astyanax |
| Astyanax aeneus costaricensis | Meek, 1914 | Astyanax nicaraguensis | Characidae | |
| Astyanax ajuricaba | Marinho & Lima, 2009 | Jupiaba ajuricaba | Characidae | |
| Astyanax albeolus | Eigenmann, 1908 | Psalidodon fasciatus | Characidae | Banded astyanax |
| Astyanax alburnus | (Hensel, 1870) | Diapoma alburnum | Characidae | |
| Astyanax alleni | (Eigenmann & McAtee, 1907) | Ctenobrycon alleni | Characidae | |
| Astyanax altior | Hubbs, 1936 | Astyanax altior | Characidae | Yucatan tetra |
| Astyanax altiparanae | Garutti & Britski, 2000 | Astyanax altiparanae | Characidae | |
| Astyanax anai | Angulo, Santos, López, Langeani & McMahan, 2018 | Astyanax anai | Characidae | |
| Astyanax angustifrons | (Regan, 1908) | Astyanax angustifrons | Characidae | |
| Astyanax anterior | Eigenmann, 1908 | Jupiaba anterior | Characidae | |
| Astyanax anteroides | Géry, 1965 | Jupiaba anteroides | Characidae | |
| Astyanax aramburui | Protogino, Miquelarena & López, 2006 | Astyanax aramburui | Characidae | |
| Astyanax argentatus | Baird & Girard, 1854 | Astyanax argentatus | Characidae | Texan tetra |
| Astyanax argyrimarginatus | Garutti, 1999 | Astyanax argyrimarginatus | Characidae | |
| Astyanax armandoi | Lozano-Vilano & Contreras-Balderas, 1990 | Astyanax aeneus | Characidae | Banded tetra |
| Astyanax asuncionensis | Géry, 1972 | Astyanax asuncionensis | Characidae | |
| Astyanax asymmetricus | Eigenmann, 1908 | Jupiaba asymmetrica | Characidae | |
| Astyanax asymmetricus colombiensis | Fowler, 1945 | Jupiaba asymmetrica | Characidae | |
| Astyanax atahualpianus | Fowler, 1907 | Moenkhausia atahualpiana | Characidae | |
| Astyanax atratoensis | Eigenmann, 1907 | Astyanax atratoensis | Characidae | |
| Astyanax aurocaudatus | Eigenmann, 1913 | Astyanax aurocaudatus | Characidae | |
| Astyanax bacalarensis | Schmitter-Soto, 2017 | Astyanax bacalarensis | Characidae | |
| Astyanax bagual | Bertaco & Vigo, 2015 | Astyanax bagual | Characidae | |
| Astyanax baileyi | (Rosen, 1972) | Astyanax baileyi | Characidae | |
| Astyanax belizianus | (Bocourt, 1868) | Astyanax belizianus | Characidae | Belizean tetra |
| Astyanax bifasciatus | Garavello & Sampaio, 2010 | Psalidodon bifasciatus | Characidae | |
| Astyanax bimaculatus | (Linnaeus, 1758) | Astyanax bimaculatus | Characidae | Twospot astyanax |
| Astyanax bimaculatus asuncionensis | Géry, 1972 | Astyanax asuncionensis | Characidae | |
| Astyanax bimaculatus borealis | Eigenmann, 1908 | Astyanax bimaculatus | Characidae | Twospot astyanax |
| Astyanax bimaculatus incaicus | Tortonese, 1942 | Astyanax bimaculatus | Characidae | Twospot astyanax |
| Astyanax bimaculatus novae | Eigenmann, 1911 | Astyanax novae | Characidae | |
| Astyanax biotae | Castro & Vari, 2004 | Astyanax biotae | Characidae | |
| Astyanax bipunctialbicaudalis | Godoy, 1977 | Moenkhausia intermedia | Characidae | |
| Astyanax bockmanni | Vari & Castro, 2007 | Psalidodon bockmanni | Characidae | |
| Astyanax boliviensis | Ruiz-C., Román-Valencia, Taphorn, Buckup & Ortega, 2018 | Astyanax boliviensis | Characidae | |
| Astyanax bopiensis | Ruiz-C., Román-Valencia, Taphorn, Buckup & Ortega 2018 | Astyanax multidens | Characidae | |
| Astyanax bourgeti | Eigenmann, 1908 | Astyanax bourgeti | Characidae | |
| Astyanax brachypterygium | Bertaco & Malabarba, 2001 | Astyanax brachypterygium | Characidae | |
| Astyanax brachypterygyrium | Bertaco & Malabarba, 2001 | Astyanax brachypterygium | Characidae | |
| Astyanax bransfordii | (Gill, 1877) | Astyanax bransfordii | Characidae | |
| Astyanax brevimanus | (Günther, 1864) | Astyanax brevimanus | Characidae | Quiché tetra |
| Astyanax brevirhinus | Eigenmann, 1908 | Astyanax brevirhinus | Characidae | |
| Astyanax brucutu | Zanata, Lima, Di Dario & Gerhard, 2017 | Astyanax brucutu | Characidae | |
| Astyanax burgerai | Zanata & Camelier, 2009 | Deuterodon burgerai | Characidae | |
| Astyanax caballeroi | (Contreras-Balderas & Rivera-Teillery, 1985) | Astyanax caballeroi | Characidae | Catemaco characin |
| Astyanax carolinae | Gill, 1870 | Psalidodon fasciatus | Characidae | Banded astyanax |
| Astyanax caucanus | (Steindachner, 1879) | Astyanax caucanus | Characidae | |
| Astyanax chapadae | Fowler, 1906 | Knodus chapadae | Characidae | |
| Astyanax chaparae | Fowler, 1943 | Astyanax chaparae | Characidae | |
| Astyanax chico | Casciotta & Almirón, 2004 | Psalidodon chico | Characidae | |
| Astyanax clavitaeniatus | Garutti, 2003 | Astyanax clavitaeniatus | Characidae | |
| Astyanax cocibolca | Bussing, 2008 | Astyanax cocibolca | Characidae | |
| Astyanax cordovae | (Günther, 1880) | Astyanax cordovae | Characidae | |
| Astyanax correntinus | (Holmberg, 1891) | Psalidodon correntinus | Characidae | |
| Astyanax courensis | Bertaco, Carvalho & Jerep, 2010 | Astyanax courensis | Characidae | |
| Astyanax cremnobates | Bertaco & Malabarba, 2001 | Astyanax cremnobates | Characidae | |
| Astyanax cubilhuitz | Schmitter-Soto, 2017 | Astyanax cubilhuitz | Characidae | |
| Astyanax daguae | Eigenmann, 1913 | Tetragonopterus daguae | Characidae | |
| Astyanax depressirostris | Miranda Ribeiro, 1908 | Astyanax depressirostris | Characidae | |
| Astyanax dissensus | Lucena & Thofehrn, 2013 | Psalidodon dissensus | Characidae | |
| Astyanax dissimilis | Garavello & Sampaio, 2010 | Astyanax dissimilis | Characidae | |
| Astyanax dnophos | Lima & Zuanon, 2004 | Astyanax dnophos | Characidae | |
| Astyanax dolinae | da Graça, Oliveira, Lima, da Silva & Fernandes, 2017 | Genus Species | New species | |
| Astyanax dorioni | (Rosen, 1970) | Astyanax dorioni | Characidae | |
| Astyanax douradilho | Bertaco, 2014 | Astyanax douradilho | Characidae | |
| Astyanax eigenmanni | Evermann & Kendall, 1906 | Bryconamericus eigenmanni | Characidae | |
| Astyanax eigenmanniorum | (Cope, 1894) | Psalidodon eigenmanniorum | Characidae | |
| Astyanax elachylepis | Bertaco & Lucinda, 2005 | Astyanax elachylepis | Characidae | |
| Astyanax embera | Ruiz-C., Román-Valencia, Taphorn, Buckup & Ortega, 2018 | Astyanax embera | Characidae | |
| Astyanax emperador | Eigenmann & Ogle, 1907 | Bryconamericus emperador | Characidae | |
| Astyanax endy | Mirande, Aguilera & Azpelicueta, 2006 | Psalidodon endy | Characidae | |
| Astyanax epiagos | Zanata & Camelier, 2008 | Astyanax epiagos | Characidae | |
| Astyanax eremus | Ingenito & Duboc, 2014 | Astyanax eremus | Characidae | |
| Astyanax erythropterus | (Holmberg, 1891) | Psalidodon erythropterus | Characidae | |
| Astyanax essequibensis | Eigenmann, 1909 | Jupiaba essequibensis | Characidae | |
| Astyanax fasciatus | (Cuvier, 1819) | Psalidodon fasciatus | Characidae | Banded astyanax |
| Astyanax fasciatus altior | Hubbs, 1936 | Astyanax altior | Characidae | Yucatan tetra |
| Astyanax fasciatus bimaculatus | (Linnaeus, 1758) | Astyanax bimaculatus | Characidae | Twospot astyanax |
| Astyanax fasciatus fasciatus | (Cuvier, 1819) | Psalidodon fasciatus | Characidae | Banded astyanax |
| Astyanax fasciatus mexicanus | (De Filippi, 1853) | Astyanax mexicanus | Characidae | Mexican tetra |
| Astyanax fasciatus orteguasae | Fowler, 1943 | Psalidodon fasciatus | Characidae | Banded astyanax |
| Astyanax fasciatus parahybae | Eigenmann, 1908 | Psalidodon parahybae | Characidae | |
| Astyanax fasciatus viejita | (Valenciennes, 1850) | Psalidodon fasciatus | Characidae | Banded astyanax |
| Astyanax fasslii | (Steindachner, 1915) | Astyanax fasslii | Characidae | |
| Astyanax festae | (Boulenger, 1898) | Eretmobrycon festae | Characidae | |
| Astyanax filiferus | (Eigenmann, 1913) | Astyanax filiferus | Characidae | |
| Astyanax finitimus | (Bocourt, 1868) | Astyanax finitimus | Characidae | Veracruz tetra |
| Astyanax gandhiae | Ruiz-C., Román-Valencia, Taphorn, Buckup & Ortega, 2018 | Astyanax gandhiae | Characidae | |
| Astyanax gisleni | Dahl, 1943 | Astyanax gisleni | Characidae | |
| Astyanax giton | Eigenmann, 1908 | Deuterodon giton | Characidae | |
| Astyanax goyacensis | Eigenmann, 1908 | Astyanax goyacensis | Characidae | |
| Astyanax goyanensis | (Miranda Ribeiro, 1944) | Astyanax goyanensis | Characidae | |
| Astyanax gracilior | Eigenmann, 1908 | Astyanax gracilior | Characidae | |
| Astyanax grandis | Meek & Hildebrand, 1912 | Psalidodon fasciatus | Characidae | Banded astyanax |
| Astyanax guaporensis | Eigenmann, 1911 | Makunaima guaporensis | Characidae | |
| Astyanax guaricana | Oliveira, Abilhoa & Pavanelli, 2013 | Astyanax guaricana | Characidae | |
| Astyanax guianensis | Eigenmann, 1909 | Makunaima guianensis | Characidae | |
| Astyanax gymnodontus | (Eigenmann, 1911) | Psalidodon gymnodontus | Characidae | |
| Astyanax gymnogenis | Eigenmann, 1911 | Psalidodon gymnogenys | Characidae | |
| Astyanax gymnogenys | Eigenmann, 1911 | Psalidodon gymnogenys | Characidae | |
| Astyanax hamatilis | Camelier & Zanata, 2014 | Deuterodon hamatilis | Characidae | |
| Astyanax hanstroemi | Dahl, 1943 | Psalidodon fasciatus | Characidae | Banded astyanax |
| Astyanax hasemani | Eigenmann, 1914 | Diapoma alburnum | Characidae | |
| Astyanax hastatus | Myers, 1928 | Deuterodon hastatus | Characidae | |
| Astyanax henseli | de Melo & Buckup, 2006 | Astyanax henseli | Characidae | |
| Astyanax hermosus | Miquelarena, Protogino & López, 2005 | Psalidodon hermosus | Characidae | |
| Astyanax heterurus | Eigenmann & Wilson, 1914 | Psalidodon fasciatus | Characidae | Banded astyanax |
| Astyanax integer | Myers, 1930 | Astyanax integer | Characidae | |
| Astyanax intermedius | Eigenmann, 1908 | Deuterodon intermedius | Characidae | |
| Astyanax ipanquianus | (Cope, 1877) | Acrobrycon ipanquianus | Characidae | |
| Astyanax ita | Almirón, Azpelicueta & Casciotta, 2002 | Psalidodon ita | Characidae | |
| Astyanax jacobinae | Zanata & Camelier, 2008 | Astyanax jacobinae | Characidae | Piaba |
| Astyanax jacuhiensis | (Cope, 1894) | Astyanax jacuhiensis | Characidae | |
| Astyanax janeiroensis | Eigenmann, 1908 | Deuterodon janeiroensis | Characidae | |
| Astyanax jenynsii | (Steindachner, 1877) | Astyanax jenynsii | Characidae | |
| Astyanax jequitinhonhae | (Steindachner, 1877) | Psalidodon jequitinhonhae | Characidae | |
| Astyanax joaovitori | Oliveira, Pavanelli & Bertaco, 2017 | Astyanax joaovitori | Characidae | |
| Astyanax jordanensis | Vera Alcaraz, Pavanelli & Bertaco, 2009 | Astyanax jordanensis | Characidae | |
| Astyanax jordani | (Hubbs & Innes, 1936) | Astyanax jordani | Characidae | |
| Astyanax keithi | Géry, Planquette & Le Bail, 1996 | Jupiaba keithi | Characidae | |
| Astyanax kennedyi | Géry, 1964 | Astyanax kennedyi | Characidae | |
| Astyanax keronolepis | Silva, Malabarba & Malabarba, 2019 | Astyanax keronolepis | Characidae | |
| Astyanax kompi | Hildebrand, 1938 | Astyanax kompi | Characidae | |
| Astyanax kullanderi | Costa, 1995 | Astyanax kullanderi | Characidae | |
| Astyanax lacustris | (Lütken, 1875) | Astyanax lacustris | Characidae | |
| Astyanax latens | Mirande, Aguilera & Azpelicueta, 2004 | Andromakhe latens | Characidae | |
| Astyanax laticeps | (Cope, 1894) | Astyanax laticeps | Characidae | |
| Astyanax leonidas | Azpelicueta, Casciotta & Almirón, 2002 | Psalidodon leonidas | Characidae | |
| Astyanax leopoldi | Géry, Planquette & Le Bail, 1988 | Astyanax leopoldi | Characidae | |
| Astyanax lineatus | (Perugia, 1891) | Astyanax lineatus | Characidae | |
| Astyanax linneatus | (Perugia, 1891) | Astyanax lineatus | Characidae | |
| Astyanax longior | (Cope, 1878) | Astyanax longior | Characidae | |
| Astyanax longirhinus | Garavello & Sampaio, 2010 | Astyanax longirhinus | Characidae | |
| Astyanax lorien | Zanata, Burger & Camelier, 2018 | Astyanax lorien | Characidae | |
| Astyanax macal | Schmitter-Soto, 2017 | Astyanax macal | Characidae | |
| Astyanax maculisquamis | Garutti & Britski, 1997 | Astyanax maculisquamis | Characidae | |
| Astyanax magdalenae | Eigenmann & Henn, 1916 | Astyanax magdalenae | Characidae | |
| Astyanax marionae | Eigenmann, 1911 | Psalidodon marionae | Characidae | |
| Astyanax maroniensis | Géry, Planquette & Le Bail, 1996 | Jupiaba maroniensis | Characidae | |
| Astyanax maximus | (Steindachner, 1876) | Astyanax maximus | Characidae | |
| Astyanax megalops | Eigenmann, 1907 | Moenkhausia megalops | Characidae | |
| Astyanax megaspilura | Fowler, 1944 | Astyanax megaspilura | Characidae | |
| Astyanax metae | Eigenmann, 1914 | Astyanax maximus | Characidae | |
| Astyanax meunieri | Géry, Planquette & Le Bail, 1996 | Jupiaba meunieri | Characidae | |
| Astyanax mexicanus | (De Filippi, 1853) | Astyanax mexicanus | Characidae | Mexican tetra |
| Astyanax mexicanus jordani | (Hubbs & Innes, 1936) | Astyanax jordani | Characidae | |
| Astyanax microcephalus | Miranda Ribeiro, 1908 | Bryconamericus microcephalus | Characidae | |
| Astyanax microlepis | Eigenmann, 1913 | Astyanax microlepis | Characidae | |
| Astyanax microschemos | Bertaco & Lucena, 2006 | Astyanax microschemos | Characidae | |
| Astyanax minor | Garavello & Sampaio, 2010 | Astyanax minor | Characidae | |
| Astyanax mizquae | Fowler, 1943 | Knodus mizquae | Characidae | |
| Astyanax moorii | (Boulenger, 1892) | Astyanax moorii | Characidae | |
| Astyanax mucronatus | Eigenmann, 1909 | Jupiaba mucronata | Characidae | |
| Astyanax multidens | (Pearson, 1924) | Astyanax multidens | Characidae | |
| Astyanax multidens | Eigenmann, 1908 | Makunaima multidens | Characidae | |
| Astyanax mutator | Eigenmann, 1909 | Deuterodon mutator | Characidae | |
| Astyanax myersi | (Fernández-Yépez, 1950) | Astyanax myersi | Characidae | |
| Astyanax nasutus | Meek, 1907 | Astyanax nasutus | Characidae | |
| Astyanax nicaraguensis | Eigenmann & Ogle, 1907 | Astyanax nicaraguensis | Characidae | |
| Astyanax nobre | Dagosta & Marinho, 2022 | Astyanax nobre | Characidae | |
| Astyanax novae | Eigenmann, 1911 | Astyanax novae | Characidae | |
| Astyanax obscurus | (Hensel, 1870) | Astyanax obscurus | Characidae | |
| Astyanax ocellatus | Géry, Planquette & Le Bail, 1996 | Jupiaba ocellata | Characidae | |
| Astyanax ocotal | Valdez-Moreno, Rodiles-Hernández & Schmitter-Soto, 2017 | Astyanax ocotal | Characidae | |
| Astyanax ojiara | Azpelicueta & Garcia, 2000 | Psalidodon ojiara | Characidae | |
| Astyanax orbignyanus | (Valenciennes, 1850) | Astyanax orbignyanus | Characidae | |
| Astyanax orstedii | (Lütken, 1875) | Astyanax orstedii | Characidae | Costa Rican tetra |
| Astyanax orthodus | Eigenmann, 1907 | Astyanax orthodus | Characidae | |
| Astyanax pampa | Casciotta, Almirón & Azpelicueta, 2005 | Psalidodon pampa | Characidae | |
| Astyanax panamensis | (Günther, 1864) | Astyanax panamensis | Characidae | Panamanian tetra |
| Astyanax paraguayensis | (Fowler, 1918) | Astyanax paraguayensis | Characidae | |
| Astyanax parahybae | Eigenmann, 1908 | Psalidodon parahybae | Characidae | |
| Astyanax paranae | Eigenmann, 1914 | Psalidodon paranae | Characidae | |
| Astyanax paranahyba | Eigenmann, 1911 | Astyanax paranahybae | Characidae | |
| Astyanax paranahybae | Eigenmann, 1911 | Astyanax paranahybae | Characidae | |
| Astyanax pardensis | Salgado, 2021 | Astyanax pardensis | Characidae | |
| Astyanax paris | Azpelicueta, Almirón & Casciotta, 2002 | Andromakhe paris | Characidae | |
| Astyanax pedri | (Eigenmann, 1908) | Astyanax pedri | Characidae | |
| Astyanax pelecus | Bertaco & Lucena, 2006 | Deuterodon pelecus | Characidae | |
| Astyanax pelegrini | Eigenmann, 1907 | Psalidodon pellegrini | Characidae | |
| Astyanax pellegrini | Eigenmann, 1907 | Psalidodon pellegrini | Characidae | |
| Astyanax petenensis | (Günther, 1864) | Astyanax petenensis | Characidae | Petén tetra |
| Astyanax pinnatus | (Eigenmann, 1909) | Jupiaba pinnata | Characidae | |
| Astyanax pirabitira | Lucena, Bertaco & Berbigier, 2013 | Astyanax pirabitira | Characidae | |
| Astyanax pirapuan | Tagliacollo, Britzke, Silva & Benine, 2011 | Astyanax pirapuan | Characidae | |
| Astyanax poetzschkei | Ahl, 1932 | Astyanax poetzschkei | Characidae | |
| Astyanax polylepis | (Günther, 1864) | Jupiaba polylepis | Characidae | |
| Astyanax potaroensis | Eigenmann, 1909 | Jupiaba potaroensis | Characidae | |
| Astyanax potaroensis | (Eigenmann, 1909) | Deuterodon potaroensis | Characidae | |
| Astyanax powelli | Terán, Butí & Mirande, 2017 | Psalidodon powelli | Characidae | |
| Astyanax procerus | Lucena, Castro & Bertaco, 2013 | Astyanax procerus | Characidae | |
| Astyanax puka | Mirande, Aguilera & Azpelicueta, 2007 | Psalidodon puka | Characidae | |
| Astyanax pynandi | Casciotta, Almirón, Bechara, Roux & Ruíz Díaz, 2003 | Psalidodon pynandi | Characidae | |
| Astyanax regani | Meek, 1909 | Psalidodon fasciatus | Characidae | Banded astyanax |
| Astyanax ribeirae | Eigenmann, 1911 | Deuterodon ribeirae | Characidae | |
| Astyanax rioverde | Lozano-Vilano & Schmitter-Soto, 2017 | Astyanax rioverde | Characidae | |
| Astyanax rivularis | (Lütken, 1875) | Psalidodon rivularis | Characidae | |
| Astyanax robustus | Meek, 1912 | Astyanax robustus | Characidae | |
| Astyanax ruberrimus | Eigenmann, 1913 | Astyanax ruberrimus | Characidae | |
| Astyanax rubropictus | (Berg, 1901) | Bryconamericus rubropictus | Characidae | |
| Astyanax rupestris | Zanata, Burger & Camelier, 2018 | Astyanax rupestris | Characidae | |
| Astyanax rupununi | Fowler, 1914 | Astyanax rupununi | Characidae | |
| Astyanax rutilus | (Jenyns, 1842) | Psalidodon rutilus | Characidae | |
| Astyanax rutilus nicaraguensis | Eigenmann & Ogle, 1907 | Astyanax nicaraguensis | Characidae | |
| Astyanax saguazu | Casciotta, Almirón & Azpelicueta, 2003 | Andromakhe saguazu | Characidae | |
| Astyanax saltor | Travassos, 1960 | Astyanax saltor | Characidae | |
| Astyanax salvatoris | Valdez-Moreno, Lozano-Vilano & Schmitter-Soto, 2017 | Astyanax salvatoris | Characidae | |
| Astyanax scabripinnis | (Jenyns, 1842) | Astyanax scabripinnis | Characidae | |
| Astyanax scabripinnis intermedius | Eigenmann, 1908 | Deuterodon intermedius | Characidae | |
| Astyanax scabripinnis laticeps | (Cope, 1894) | Astyanax laticeps | Characidae | |
| Astyanax scabripinnis paranae | Eigenmann, 1914 | Psalidodon paranae | Characidae | |
| Astyanax scabripinnis scabripinnis | (Jenyns, 1842) | Astyanax scabripinnis | Characidae | |
| Astyanax schubarti | Britski, 1964 | Psalidodon schubarti | Characidae | |
| Astyanax scintillans | Myers, 1928 | Astyanax scintillans | Characidae | |
| Astyanax scologaster | Weitzman & Vari, 1986 | Jupiaba scologaster | Characidae | |
| Astyanax serratus | Garavello & Sampaio, 2010 | Astyanax serratus | Characidae | |
| Astyanax siapae | Garutti, 2003 | Astyanax siapae | Characidae | |
| Astyanax simulatus | Eigenmann, 1924 | Moenkhausia simulata | Characidae | |
| Astyanax sincora | Burger, Carvalho & Zanata, 2019 | Astyanax sincora | Characidae | |
| Astyanax sp. B | Not applicable | Psalidodon bifasciatus | Characidae | |
| Astyanax sp. C | Not applicable | Astyanax minor | Characidae | |
| Astyanax sp. D | Not applicable | Astyanax serratus | Characidae | |
| Astyanax sp. E | Not applicable | Astyanax dissimilis | Characidae | |
| Astyanax stenohalinus | Messner, 1962 | Andromakhe stenohalina | Characidae | |
| Astyanax stilbe | (Cope, 1870) | Astyanax stilbe | Characidae | |
| Astyanax superbus | Myers, 1942 | Astyanax superbus | Characidae | |
| Astyanax symmetricus | Eigenmann, 1908 | Astyanax symmetricus | Characidae | |
| Astyanax taeniatus | (Jenyns, 1842) | Deuterodon taeniatus | Characidae | |
| Astyanax tamiahua | Schmitter-Soto, 2017 | Astyanax tamiahua | Characidae | |
| Astyanax taurorum | Lucena, Zaluski & Lucena, 2017 | Genus Species | New species | |
| Astyanax tehuacanensis | Schmitter-Soto, 2017 | Astyanax tehuacanensis | Characidae | |
| Astyanax totae | Ferreira Haluch & Abilhoa, 2005 | Astyanax totae | Characidae | |
| Astyanax trierythropterus | Godoy, 1970 | Astyanax trierythropterus | Characidae | |
| Astyanax troya | Azpelicueta, Casciotta & Almirón, 2002 | Psalidodon troya | Characidae | |
| Astyanax tumbayaensis | Miquelarena & Menni, 2005 | Psalidodon tumbayaensis | Characidae | |
| Astyanax tupi | Azpelicueta, Mirande, Almirón & Casciotta, 2003 | Andromakhe tupi | Characidae | |
| Astyanax turmalinensis | Triques, Vono & Caiafa, 2003 | Astyanax turmalinensis | Characidae | |
| Astyanax unitaeniatus | Garutti, 1998 | Astyanax unitaeniatus | Characidae | |
| Astyanax utiariti | Bertaco & Garutti, 2007 | Astyanax utiariti | Characidae | |
| Astyanax validus | Géry, Planquette & Le Bail, 1991 | Astyanax validus | Characidae | |
| Astyanax varii | Zanata, Burger, Vita & Camelier, 2019 | Astyanax varii | Characidae | |
| Astyanax varzeae | Abilhoa & Duboc, 2007 | Astyanax varzeae | Characidae | |
| Astyanax venezuelae | Schultz, 1944 | Astyanax venezuelae | Characidae | |
| Astyanax vermilion | Zanata & Camelier, 2009 | Astyanax vermilion | Characidae | |
| Astyanax viejita | (Valenciennes, 1850) | Psalidodon fasciatus | Characidae | Banded astyanax |
| Astyanax villwocki | Zarske & Géry, 1999 | Astyanax villwocki | Characidae | |
| Astyanax viridis | Salgado, 2021 | Genus Species | New species | |
| Astyanax xavante | Garutti & Venere, 2009 | Psalidodon xavante | Characidae | |
| Astyanax xiru | Lucena, Castro & Bertaco, 2013 | Psalidodon xiru | Characidae | |
| Astyanax yariguies | (Torres-Mejia, Hernández & Senechal, 2012) | Astyanax yariguies | Characidae | |
| Astyanax zonatus | Eigenmann, 1908 | Jupiaba zonata | Characidae |