Diplodon parallelipipedon d’Orbigny, 1846
‘Lea’ of Authors.
d’Orbigny, 1846, Voyage dans l’Amérique Méridionale 5: 609.
Simpson, 1900, Proc. U.S. Nat. Mus. 22: 884.
Corsi, 1900, Anais Mus. Nac. Montevideo 2: 447.
Simpson, 1914, Descr. Cat. Naiades: 1274-1275.
Haas, 1930, Senckenbergiana 12: 189.
Morretes, 1949, Arqu. Mus. Paranaense 7: 18.
Parodiz, 1968, Sterkiana 30: 8.
Mansur, 1970, Iheringia 39: 83.
Quintana, 1982, Rev. Mus. Argentino Zoológicas 11: 128.
Simone, 2006, Land. Freshw. Moll. Brazil.: 260.
(error for Unio parallelopipedon Lea, 1834)

Diplodon beskeanus Lea, 1852
‘Dunker’ of Authors.
Lea, 1852, Synopsis Fam. Naiades: 39, Corrigenda et Addenda.
Lea, 1870, Synopsis Fam. Naiades: 61.
Simpson, 1900, Proc. U.S. Nat. Mus. 22: 875.
Ihering, 1910, Abh. Senckenb. Naturf. Ges. 32: 139.
Figueiras, 1965, Comm. Soc. Malac. Uruguay 1(8): 238.
Parodiz, 1968, Sterkiana 30: 3.
(error for Unio besckeanus Dunker, 1849)

Unio psammaticus Lea, 1852
‘Bronn’ Lea, 1852, Synopsis Fam. Naiades: 21.
‘Philippi’ Parodiz, 1968, Sterkiana 30: 9.
(error for Unio psammactinus Philippi, 1848)

Unio koseretzi Simpson, 1900
‘Clessin’ of Authors.
Simpson, 1900, Proc. U.S. Nat. Mus. 22: 894.
Simpson, 1914, Descr. Cat. Naiades: 1312.
Haas, 1930, Senckenbergiana 12: 182.
Bonetto, 1964, Physis 24(68): 327.
Parodiz, 1968, Sterkiana 30: 7.
Bonetto & Mansur, 1970, Acta Zool. Lilloana 27: 245.
(error for Unio koseritzi Clessin, 1888)

Unio janthinus Haas, 1930
‘Philippi’ of Authors.
Haas, 1930, Senckenbergiana 12: 178.
Parodiz, 1968, Sterkiana 30: 7.
(error for Unio ianthinus Philippi, 1869)

Unio demerarensis Parodiz, 1968
‘Lea’ Parodiz, 1968, Sterkiana 30: 4.
(error for Unio demeraraensis Lea, 1859)

Unio greeffianus Parodiz, 1968
‘von Ihering’ Parodiz, 1968, Sterkiana 30: 6.
(error for Unio greeffeanus Ihering, 1893)

Unio bomplandi Parodiz, 1968
‘Valenciennes’ Parodiz, 1968, Sterkiana 30: 3, 12.
(error for Unio bonplandii Lea, 1870)

Diplodon bassleri (Marsh., 1928)

Diplodon beskeanus [sic] (Dunker, 1848)
+ Diplodon garbei Ihering, 1910
+ Diplodon panco Ihering, 1910
+ Diplodon kelseyi F. Baker, 1913

Diplodon bondenbenderi D. J., 1927

Diplodon borealis Pils., 1921

Diplodon burroughianus burroughianus (Lea, 1834)
+ Unio locellus Lea, 1866
+ Diplodon (s.s.) iheringi Simpson, 1914
+ Diplodon (Cyclomya) smithi Marshall, 1926

Diplodon burroughianus wheatleyanus (Lea, 1834)
+ Unio pfeifferi Dunker, 1849
+ Unio rhuaconicus Küster, 1856

Diplodon charruanus (d’Orbigny, 1835)
+ Unio faba d’Orbigny, 1835
+ Unio lepidus Lea, 1860
+ Unio parcus Lea, 1866
+ Margaron (Unio) lepidior Lea, 1870
+ Diplodon (s.s.) perplexus Simpson, 1914
+ Diplodon trivialoides Marshall, 1922

Diplodon chilensis chilensis (Gray, 1828)
+ Unio smithii Griffith & Pidgeon, 1833
+ Unio depressa d’Orbigny, 1835
+ Unio obtusa d’Orbigny, 1835
+ Unio atratus Sowerby, 1839
+ Unio araucanus Philippi, 1847
+ Unio molinae Philippi, 1847
+ Unio casaeblancae Philippi, 1849
+ Unio casablancae Lea, 1852
+ Unio gassiei Küster, 1856
+ Unio limensis Küster, 1856
+ Unio modestus Küster, 1856
+ Unio auratus Küster, 1861
+ Unio chiloensis Küster, 1861
+ Unio aplatus Reeve, 1865
+ Unio fragilis Reeve, 1865
+ Unio colchaguensis Philippi, 1869
+ Unio diplodon Philippi, 1869
+ Unio foncki Philippi, 1869
+ Unio ianthinus Philippi, 1869
+ Unio jacobaeus Philippi, 1869
+ Unio landbecki Philippi, 1869
+ Unio montanus Philippi, 1869
+ Unio valdivianus Philippi, 1869
+ Unio longus Philippi, 1869
+ Unio funcki Paetel, 1890
+ Diplodon (s.s.) aureus Simpson, 1900
+ Diplodon (Dipldon) cuprinus Simpson, 1900

Diplodon chilensis patagonicus (d’Orbigny, 1835)
+ Unio frenzelii var. andina Ihering, 1893
+ Unio frenzelii Ihering, 1893
+ Diplodon huapensis Bartsch, 1906

Diplodon delodontus X uruguayensis

Diplodon delodontus delodontus (Lamarck, 1819)
+ Unio divaricatus Lea, 1834
+ Unio lacteolus Lea, 1834
+ Unio rudus Lea, 1859
+ Unio paraguayensis Lea, 1866
+ Unio firmus Lea, 1866
+ Unio delodon Martens, 1868
+ Unio paraguayanus Martens, 1895

Diplodon delodontus wymani (Lea, 1860)
+ Diplodon felipponei Marshall, 1917

Diplodon ellipticus (Wagner, 1827)
+ Diplodon ellypticum Wagner, 1827
+ Unio multistriatus Lea, 1831
+ Diplodon (s.s.) wagnerianum Simpson, 1900
+ Diplodon jacksoni Marshall, 1928

Diplodon expansus (Küster, 1856)
+ Unio effulgens Lea, 1856
+ Unio eurhynchus Küster, 1861
+ Unio aethiops var. piracicabana Ihering, 1893
+ Unio guahybae Simpson, 1900
+ Diplodon (s.s.) mimus Simpson, 1914
+ Diplodon (s.s.) mogymirim Ortmann, 1921

Diplodon flucki Morrison, 1943

Diplodon funebralis (Lea, 1860)
+ Unio disculus Lea, 1860

Diplodon funebralis X paranensis

Diplodon granosus (Bruguiere, 1792)
+ Unio psammactinus Philippi, 1848
+ Unio coriaceus Dunker, 1849
+ Unio granuliferus Dunker, 1849

Diplodon guaranianus (d’Orbigny, 1835)
+ Diplodon (s.s.) hasemani Ortmann, 1921
+ Diplodon asuncionis Marshall, 1926

Diplodon guaranianus biblianus (Marsh., 1932)

Diplodon guayanensis Haas, 1929

Diplodon hylaeus (d’Orbigny, 1835)

Diplodon losadae Haas, 1966

Diplodon martensi (von Ihering, 1893)
+ Unio binneyi Lea, 1845
+ Unio firmus var. boettgeri Ihering, 1893
+ Diplodon (s.s.) santamariae Simpson, 1914
+ Diplodon (s.s.) suppositus Simpson, 1914
+ Diplodon decipiens Ortmann, 1921
+ Diplodon (s.s.) imitator Ortmann, 1921
+ Diplodon simillimus Ortmann, 1921
+ Diplodon vicarius Ortmann, 1921
+ Unio sebastiani Haas, 1930
+ Unio multistriatus Haas, 1931

Diplodon obsolescens Baker, F., 1914

Diplodon parallelipipedon [sic] aethiops (Lea, 1860)
+ Unio dunkerianus Lea, 1856
+ Unio aethiopiformis Simpson, 1900

Diplodon parallelipipedon parallelipipedon [sic] (Lea, 1834)
+ Unio acutirostris Lea, 1866

Diplodon paranensis (Lea, 1834)
+ Unio patelloides Lea, 1860

Diplodon parodizi Bonetto, 1962

Diplodon paulista (von Ihering, 1893)
+ Margarita (Unio) modestus Lea, 1836
+ Unio greeffeanus Ihering, 1893
+ Diplodon (s.s.) leai Simpson, 1900
+ Diplodon (s.s.) semigranosus Simpson, 1914

Diplodon pazi (Hidalgo, 1868)

Diplodon peraeformis (Lea, 1860)
+ Unio prunoides Lea, 1868

Diplodon piceus (Lea, 1860)
+ Unio koseritzi Clessin, 1888
+ Diplodon hidalgoi Haas, 1916
+ Diplodon fortis Marshall, 1917
+ Diplodon berthae Ortmann, 1921
+ Diplodon hildae Ortmann, 1921

Diplodon rhombeus (Wagner in Spix, 1827)
+ Unio brownii Lea, 1856
+ Unio suavidicus Lea, 1856
+ Unio demeraraensis Lea, 1859
+ Diplodon hartwrighti Ihering, 1910
+ Diplodon ellipticus santanus Ihering, 1910
+ Diplodon (Diplodon) besckeanus nordestinus Haas, 1938

Diplodon rhuacoicus (d’Orbigny, 1835)
+ Diplodon subcylindricus Marshall, 1922
+ Diplodon pilsbryi Marshall, 1928
+ Diplodon yaguaronis Marshall, 1930

Diplodon rotundus enno (Ortmann, 1921)

Diplodon rotundus fontaineanus [sic] (d’Orbigny, 1835)

Diplodon rotundus gratus (Lea, 1860)
+ Unio rufofuscus Lea, 1865
+ Unio gratus Ihering, 1893
+ Diplodon (Cyclomya s.s.) fontainianus var. deceptus Simpson, 1914

Diplodon rotundus rotundus (Wagner, 1827)
+ Unio quadrans Lea, 1860
+ Unio schenederi Ihering, 1893

Diplodon solidulus (Philippi, 1869)

Diplodon solisianus (d’Orbigny, 1835)

Diplodon trifidus (Lea, 1860)

Diplodon uruguayensis (Lea, 1860)
+ Unio piger Lea, 1860
+ Unio ampullaceus Lea, 1866
+ Unio apprimus Lea, 1866
+ Diplodon podagrosus Marshall, 1923

Diplodon variabilis (Maton, 1811)
+ Unio matoniana d’Orbigny, 1835
+ Unio membranacea Hanley, 1843
+ Unio subtrapezius Philippi, 1847
+ Unio bulloides Lea, 1859
+ Diplodon arcuatus Marshall, 1922
+ Diplodon subquadratus Marshall, 1922
+ Diplodon (Bulloideus ?) perfragilis Marshall, 1923

Prisodon obliquus Schumacher
+ Unio macropterus Dunker, 1846