Aplodon Wagner, 1827
Spix in Wagner, 1827, Test. Fluv. Brasil.: pl. 25, figs. 1-2.
(homonym of Rafinesque, 1819 [Gastrop.]; renamed Spixoconcha Pilsbry, 1893)
Type species: Aplodon inerme Wagner, 1827 (monotypy) = Monocondylaea minuana

Monocondylaea d’Orbigny, 1835
d’Orbigny, 1835, Mag. Zool. 5(61-62): 37.
(intro'd as sub-gen. of Unio Retzius, 1788; renamed Monocondylus Morelet, 1866)
Type species: Unio (Monocondylaea) paraguayana d’Orbigny, 1835 (original designation) = Monocondylaea paraguayana

Monocondylea Moricand, 1837
Moricand, 1837, Mém. Soc. Phys. Hist. Nat. Genève 8(1): 145.
d’Orbigny, 1846, Voyage dans l’Amérique Méridionale 5: 611.
Gray, 1847, Proc. Zool. Soc. London 15: 196.
Herrmannsen, 1849, Ind. Gener. Malacol. 2: 668.
Gould, 1850, Proc. Boston Soc. Nat. Hist. 3: 293.
Hupé, 1857, [in] Castelnau, Anim. Nouv. Rares d’Amer. Sud: 84.
Petit de la Saussaye, 1865, J. de Conch. 13: 15.
Heude, 1875, Conch. Fluv. Nanking (1): pl. 4.
Deshayes & Jullien, 1876, Nouv. Arch. Mus. Hist. Nat. Paris 10: 117.
Morlet, 1889, J. de Conch. 37: 165.
Hoeh et al., 2009, Malacologia 51(2): 310.
Zieritz et al., 2015, J. Zool. Syst. Evol. Res. 53(1): 82.
(error for Monocondylaea d’Orbigny, 1835)

Monocondyla Gray, 1840
Gray, 1840, Synopt. Cont. Brit. Mus. 42nd ed.: 150.
(error for Monocondylaea d’Orbigny, 1835)

Monocondyloea Lea, 1852
Lea, 1852, Synopsis Fam. Naiades: 45 [as ‘Monocondylœa’].
Lea, 1859, Proc. Acad. Nat. Sci. 11: 187 [as ‘Monocondylœa’].
Lea, 1860, Jour. Acad. Nat. Sci. 4 [O. 7]: 235 [53] [as ‘Monocondylœa’].
Lea, 1870, Synopsis Fam. Naiades: 73 [as ‘Monocondylœa’].
(error for Monocondylaea d’Orbigny, 1835)

Monocondloea Lea, 1862
Lea, 1862, Proc. Acad. Nat. Sci. 14: 176 [as ‘Monocondlœa’].
(error for Monocondylaea d’Orbigny, 1835)

Monocondylus Morelet, 1866
Morelet, 1866, J. de Conch. 14: 62.
Morelet, 1866, Rev. Mag. Zool. 18: 167.
(new name for Monocondylaea d’Orbigny, 1835)

Monocondyloia Paetel, 1875
Paetel, 1875, Fam. Gatt. Moll.: 128.
(error for Monocondylaea d’Orbigny, 1835)

Moncondylaea Clessin, 1876
Clessin, 1876, Conchyl. Cab.: 251.
(error for Monocondylaea d’Orbigny, 1835)

Spixoconcha Pilsbry, 1893
Pilsbry, 1893, Nautilus 7: 30.
(new name for Aplodon Wagner, 1827)

Monocondilaea Salisbury, 1948
Salisbury, 1948, Zool. Rec. 82: 50.
(error for Monocondylaea d’Orbigny, 1835)

Spixioconcha Simone, 2006
‘Pilsbry’ Simone, 2006, Land. Freshw. Moll. Brazil.: 290.
(error for Spixoconcha Pilsbry, 1893)

Taxonomic History (since 1900)

Monocondylaea — Simpson (1900), Simpson (1914), Ortmann (1921), Marshall (1922), ..., Guerra et al. (2019), Mansur et al. (2020), Graf & Cummings (2021), Torres et al. (2024)
Iheringella — Simpson (1900), Simpson (1914)
Monocondylæa — Corsi (1900)
Aplodon — Ihering (1910)
Monocondylea [sic] — Rumi et al. (2008), Hoeh et al. (2009), Zieritz et al. (2015)