Unio guaraniana d’Orbigny, 1835
d’Orbigny, 1835. Mag. Zool. 5(61-62): 37.
d’Orbigny, 1846. Voyage dans l’Amérique Méridionale 5: 608, pl. 69, figs. 10-12.
Type(s): LECTOTYPE BMNH_54-12-4-841, Rio Paraná, Prov. Corrientes, Argentina.

Diplodon (s.s.) hylaeus — Simpson (1900), Simpson (1914)
Diplodon (s.s.) guaranianus — Ortmann (1921), Morretes (1949), Pereira et al. (2014)
Diplodon guaranianus guaranianus — Haas (1930)
Ecuadorea guaraniana — Modell (1950)
Diplodon hylaeus — Bonetto (1954)
Diplodon (Rhipidodonta) hylaeus — Bonetto (1965)
Diplodon (Rhipidodonta) hylaeus hylaeus — Figueiras (1965)
Diplodon guaranianus — Parodiz (1968), Quintana (1982), Mansur et al. (2020), Graf & Cummings (2021), Breure et al. (2022)
Diplodon (s.s.) guaranianus guaranianus — Haas (1969)
Rhipidodonta hylaea — Simone (2006), IUCN (2011)

Castalia pazi Hidalgo, 1868
Hidalgo, 1868. J. de Conch. 16: 353, pl. 13, fig. 6.
Type(s): SYNTYPE SMF_3892, Rio Imbabura, Amazonas - Geb., Ecuador.

Diplodon (s.s.) pazi — Simpson (1900), Simpson (1914)
Diplodon guaranianus pazi — Haas (1930)
Ecuadorea pazi — Modell (1950)
Diplodon (Rhipidodonta) hylaeus pazi — Figueiras (1965)
Diplodon pazi — Parodiz (1968)
Diplodon (s.s.) guaranianus pazi — Haas (1969)
Rhipidodonta hylaea — Simone (2006), IUCN (2011)
Diplodon guaranianus — Breure et al. (2022)

Diplodon (s.s.) hasemani Ortmann, 1921
Ortmann, 1921. Mem. Carnegie Mus. 8: 478, pl. 34, figs. 1-4; pl. 47, fig. 5; text fig. 4a.
Type(s): LECTOTYPE CM_61.5857 (by R.I. Johnson, 1977: 238), Rio Guaporé, near Rio Sao Simao, Matto Grosso, Brazil.

Diplodon (s.s.) hasemani — Ortmann (1921), Morretes (1949)
Diplodon guaranianus hasemani — Haas (1930)
Schleschiella iheringi hasemani — Modell (1950)
Diplodon hasemani — Bonetto (1959)
Diplodon (Rhipidodonta) hylaeus hasemani — Figueiras (1965)
Diplodon guaranianus — Parodiz (1968)
Diplodon (s.s.) guaranianus hasemani — Haas (1969)
Rhipidodonta hylaea — Simone (2006)

Diplodon asuncionis Marshall, 1926
Marshall, 1926. Proc. U.S. Nat. Mus. 69(2638): 8, pl. 2, fig. 2; pl. 3, fig. 5.
Type(s): HOLOTYPE USNM_361959, Paraguay R., Asuncion, Paraguay.

Diplodon asunicionis [sic] — Haas (1930)
Schleschiella burroughiana burroughiana — Modell (1950)
Diplodon hylaeus — Bonetto (1954)
Diplodon asuncionis — Bonetto (1959)
Diplodon (Rhipidodonta) hylaeus — Bonetto (1965)
Diplodon (Rhipidodonta) hylaeus hylaeus — Figueiras (1965)
Diplodon guaranianus — Parodiz (1968), Quintana (1982)
Diplodon (s.s.) asuncionis — Haas (1969)
Rhipidodonta hylaea — Simone (2006), IUCN (2011)

Schleschiella iheringi schadei Modell, 1950
Modell, 1950. Arch. Moll. 79(4/6): 141, pl. 11, fig. 9.
(intro'd as intra-sp. of Diplodon (s.s.) iheringi Simpson, 1914)

Schleschiella iheringi schadei — Modell (1950)
Diplodon (Rhipidodonta) hylaeus — Bonetto (1965)
Diplodon (Rhipidodonta) hylaeus hylaeus — Figueiras (1965)
— Parodiz (1968)
Diplodon (s.s.) iheringi — Haas (1969)
Diplodon guaranianus — Quintana (1982)
Rhipidodonta hylaea — Simone (2006)

Unio guarianus Lea, 1852
‘D’Orb.’ Lea, 1852. Synopsis Fam. Naiades: 21.
‘D’Orb.’ Lea, 1870. Synopsis Fam. Naiades: 31.
(error for Unio guaraniana d’Orbigny, 1835)

Unio hylaeus Martens, 1894
Martens, 1894. S.-Ber. Ges. Naturf. Freunde zu Berlin 1894: 164.
(misidentified reference to Unio hylaea d’Orbigny, 1835)

Diplodon guaranianus — Quintana (1982)

Unio garaniana Bonetto, 1965
‘d’Orbigny’ Bonetto, 1965. Anais Congr. Lat.-Amer. Zool. 2: 51.
(error for Unio guaraniana d’Orbigny, 1835)