Mya syrmatophora Gmelin, 1791
Meuschen in Gronovius, 1781, Zoophylacium Gronovianum: pl. 8, figs. 1-2. [non-binomial]
Gmelin, 1791, Syst. Nat. 1(6): 3222.

Mya syrmatophora — Gmelin (1791), Schreibers (1793), Dillwyn (1817), Wood (1825)
Hyria avicularis — Lamarck (1819), Children (1823), Wood (1828)
Unio avicularis — Deshayes (1832)
Hyria syrmatophora — Lea (1834), Sowerby (1839), Swainson (1840), Hanley (1843), Küster (1856), Hupé (1857), Sowerby (1869)
Margarita (Unio) syrmatophorus — Lea (1836), Lea (1838)
Margaron (Triquetra) subviridis — Lea (1852), Lea (1870)
Unio (Hyria) syrmatophora — Woodward (1871)
Hyria (s.s.) syrmatophora — Fischer (1887)
Prisodon (s.s.) syrmatophorus — Simpson (1900), Simpson (1914)
Prisodon syrmatophora — Ihering (1910), F. Baker (1913)
Prisodon syrmatophorus — H.B. Baker (1930), Modell (1942), IUCN (2014), Graf & Cummings (2021)
Prisodon syrmatophorus syrmatophorus — Haas (1931), Haas (1949)
Paxyodon syrmatophorus — Parodiz & Bonetto (1963), Mansur & Valer (1992), Mansur et al. (1997), Simone (2006), Lasso et al. (2009), Bogan (2010), Santos-Neto et al. (2016), Santos-Neto et al. (2018), Mansur et al. (2020)
Paxyodon syrmatophorus syrmatophorus — Haas (1969)
Paxyodon syrmatophora — Haas (1969), Martinez et al. (2004)
Paxyodon syrmathophorus — Ramírez et al. (2003), Pereira et al. (2014)
Prisodon (Paxyodon) syrmatophorus — Graf & Cummings (2007)

Hyria alata Sowerby, 1869
Sowerby, 1869, Conch. Icon. 17: pl. 5, sp. 13.
Type(s): LECTOTYPE BMNH_1849-6-1-2, Guayana.

Hyria alata — Sowerby (1869)
Margaron (Triquetra) subviridis — Lea (1870)
Prisodon (s.s.) alatus — Simpson (1900), Simpson (1914)
Prisodon alatus — Ortmann (1921), Haas (1931), Morretes (1949), Haas (1949), Haas (1969), Soliman et al. (2016)
Paxyodon alatus — Haas (1969)
Paxyodon syrmatophorus — Simone (2006)

Unio brownianus Lea, 1838
Lea, 1838, Trans. Amer. Phil. Soc. 6 [O. 2]: 108, pl. 24, fig. 116.
Type(s): HOLOTYPE USNM_83883, Amazon R., S. Am.

Unio brownianus — Lea (1838)
Margarita (Unio) brownianus — Lea (1838)
Hyria browniana — Hanley (1843), Hupé (1857), Sowerby (1869)
Margaron (Triquetra) browniana — Lea (1852), Lea (1870)
Triquetra brownianus — Adams & Adams (1857)
Prisodon (s.s.) brownianus — Simpson (1900), Simpson (1914)
Prisodon brownianus — Haas (1969)
Paxyodon syrmatophorus — Simone (2006)

Hyria complanata Hupé, 1857
Hupé, 1857, [in] Castelnau, Anim. Nouv. Rares d’Amer. Sud: 80, pl. 15, fig. 3.
Type(s): UNKNOWN MNHN_MP_1542, Bresil.

Hyria complanata — Hupé (1857), Sowerby (1869)
Margaron (Triquetra) subviridis — Lea (1870)
Prisodon (s.s.) complanatus — Simpson (1900)
Prisodon (s.s.) complanata — Simpson (1914)
Prisodon syrmatophorus complanatus — Haas (1931), Haas (1932)
Paxyodon syrmatophorus complanatus — Haas (1969)
Paxyodon syrmatophorus — Simone (2006)

Triquetra pectunculus subviridis Klein, 1753
Klein, 1753, Tent. Method. Ostrac., etc.: 135, pl. 9, fig. 36. [pre-linnaean]

Triquetra pectunculus subviridis — Klein (1753)
Margaron (Triquetra) subviridis — Lea (1852), Lea (1870)
Triquetra subviridis — Adams & Adams (1857)
Prisodon (s.s.) syrmatophorus — Simpson (1900), Simpson (1914)
Paxyodon syrmatophorus — Simone (2006)

Paxyodon ponderosus Schumacher, 1817
Schumacher, 1816, Overs. Dansk. Vid. Selsk. Forhandl. Kjobehhaven 1816: 7 [as ‘ponderosum’]. [nomen nudum]
Schumacher, 1817, Essai. Nouv. Syst.: 46, 139, pl. 11, fig. 3.

Paxyodon ponderosus — Schumacher (1817)
Paxyodon ponderosum — Schumacher (1816)
Margarita (Unio) angulatus — Lea (1836), Lea (1838)
Margaron (Triquetra) corrugata — Lea (1852), Lea (1870)
Hyria syrmatophora — Küster (1856)
Prisodon (s.s.) syrmatophorus — Simpson (1900), Simpson (1914)
Paxyodon syrmatophorus — Parodiz & Bonetto (1963), Simone (2006)
Paxyodon syrmatophorus syrmatophorus — Haas (1969)
Paxyodon syrmatophora — Haas (1969)
Prisodon (Paxyodon) syrmatophorus — Graf & Cummings (2007)

Hyria avicularis Lamarck, 1819
Lister, 1685, Conch.: pl. 160, fig. 16 ?.
Lamarck, 1819, Hist. Natur. Anim. sans Vert. 6: 82, sp. 1, var. [b]. [in part]
(misidentified reference to Hyria avicularis Lamarck, 1819)

Hyria avicularis — Lamarck (1819)
Hyria cordata — Menke (1828)
Margarita (Unio) syrmatophorus — Lea (1838)
Hyria syrmatophora — Hanley (1843), Hupé (1857), Sowerby (1869)
Prisodon (s.s.) syrmatophorus — Simpson (1900), Simpson (1914)
Prisodon obliquus — Haas (1916), Haas (1969)
Paxyodon syrmatophorus — Mansur & Valer (1992)

Unio corrugata Blainville, 1825
Blainville, 1825, Manuel Malacol. et Conch.: pl. 67, fig. 1.
(misidentified reference to Hyria corrugata Lamarck, 1819)

Unio corrugata — Blainville (1825)
Margarita (Unio) angulatus — Lea (1838)
Margaron (Triquetra) subviridis — Lea (1870)
Hyria corrugata — Haas (1916)

Hyria cordata Menke, 1828
Lamarck, 1819, Hist. Natur. Anim. sans Vert. 6: 82, sp. 1, var. [b]. [in part]
Menke, 1828, Syn. Method. Moll.: 63.

Hyria cordata — Menke (1828)
Margaron (Triquetra) subviridis — Lea (1852), Lea (1870)

Hyria humilis Troschel, 1847
Troschel, 1847, unknown publication: ??. [nomen nudum]

Hyria humilis — Troschel (1847)
Margaron (Triquetra) browniana — Lea (1852), Lea (1870)

Hyria syrmatophora Küster, 1856
‘Gronov.’ Küster, 1856, Conchyl. Cab. 9(2): 141, pl. 41, fig. 4.
(reference to Mya syrmatophora Gmelin, 1791)

Hyria syrmatophora — Küster (1856)
Prisodon (s.s.) complanatus — Simpson (1900)
Prisodon (s.s.) complanata — Simpson (1914)

Paxyodon syrmathophorus Ramírez et al., 2003
‘Meuschen’ of Authors.
Ramírez et al., 2003, Rev. Biol. Trop. 51: 273.
Pereira et al., 2014, Hydrobiologia 735: [11].
(error for Mya syrmatophora Gmelin, 1791)

Paxyodon syrmathophorus — Ramírez et al. (2003)

Paxyodon symatophorus Simone, 2006
‘auctt.’ Simone, 2006, Land. Freshw. Moll. Brazil.: 251.
(error for Mya syrmatophora Gmelin, 1791)

Paxyodon symatophorus — Simone (2006)
Paxyodon syrmatophorus — Simone (2006)

Prisodon syrmatophorous IUCN, 2014
‘Meuschen’ IUCN, 2014, IUCN Red List: [web].
(error for Mya syrmatophora Gmelin, 1791)

Prisodon syrmatophorous — IUCN (2014)

Taxonomic History (since 1900)

Prisodon (s.s.) syrmatophorus — Simpson (1900), Simpson (1914)
Prisodon (s.s.) brownianus — Simpson (1900), Simpson (1914)
Prisodon (s.s.) complanatus — Simpson (1900)
Prisodon (s.s.) alatus — Simpson (1900), Simpson (1914)
Prisodon syrmatophora — Ihering (1910), F. Baker (1913)
Prisodon (s.s.) complanata — Simpson (1914)
Prisodon obliquus — Haas (1916), Haas (1969)
Hyria corrugata — Haas (1916)
Prisodon alatus — Ortmann (1921), Haas (1931), Morretes (1949), Haas (1949), Haas (1969), Soliman et al. (2016)
Prisodon syrmatophorus — H.B. Baker (1930), Modell (1942), IUCN (2014), Graf & Cummings (2021)
Prisodon syrmatophorus syrmatophorus — Haas (1931), Haas (1949)
Prisodon syrmatophorus complanatus — Haas (1931), Haas (1932)
Paxyodon syrmatophorus — Parodiz & Bonetto (1963), Mansur & Valer (1992), Mansur et al. (1997), Simone (2006), Lasso et al. (2009), Bogan (2010), Santos-Neto et al. (2016), Santos-Neto et al. (2018), Mansur et al. (2020)
Paxyodon syrmatophorus syrmatophorus — Haas (1969)
Paxyodon syrmatophora — Haas (1969), Martinez et al. (2004)
Prisodon brownianus — Haas (1969)
Paxyodon syrmatophorus complanatus — Haas (1969)
Paxyodon alatus — Haas (1969)
Paxyodon syrmathophorus — Ramírez et al. (2003), Pereira et al. (2014)
Paxyodon symatophorus — Simone (2006)
Prisodon (Paxyodon) syrmatophorus — Graf & Cummings (2007)
Prisodon syrmatophorous — IUCN (2014)