Bivalvia | Unionida | Etherioidea | Mycetopodidae | Monocondylaeinae | Monocondylaea
Spix in Wagner, 1827. Test. Fluv. Brasil.: pl. 25, figs. 1-2.
Monocondylaea inerme — Simpson (1900)
Monocondylaea inermis — Simpson (1914)
Monocondylaea minuana — Haas (1931), Haas (1969), Simone (2006)

d’Orbigny, 1835. Mag. Zool. 5(61-62): 37.
d’Orbigny, 1846. Voyage dans l’Amérique Méridionale 5(3): 612, pl. 70, figs. 8-10 [as ‘Monocondylaea minuana’].
Type(s): LECTOTYPE BMNH_1854-9-4-27, Rio del Rosario, Banda orientali, Uruguay.
Monocondylaea paraguayana — Simpson (1900)
Monocondylæa minuana — Corsi (1900)
Monocondylaea minuana — Simpson (1914), Ortmann (1921), Haas (1931), Morretes (1949), Figueiras (1965), ... Torres et al. (2018), Mansur et al. (2020), Graf & Cummings (2021), Torres et al. (2024), Campbell & Lydeard (2026)
Monocondylea [sic] minuana — Rumi et al. (2008), Hoeh et al. (2009), Zieritz et al. (2015)

Lea, 1866. Proc. Acad. Nat. Sci. 18: 34 [as ‘Monocondylœa pazii’].
Lea, 1868. Jour. Acad. Nat. Sci. 6 [O. 12]: 273, pl. 36, fig. 88 [as ‘Monocondylœa’].
Type(s): HOLOTYPE USNM_86342, South America.
Monocondylaea parchappii — Simpson (1900), Simpson (1914)
Monocondylæa pazii — Corsi (1900)
Monocondylaea minuana — Ortmann (1921), Bonetto (1966), Mansur (1970), Bonetto & Mansur (1970), Simone (2006)
Monocondylaea paraguayana paraguayana — Haas (1931), Haas (1969)
Monocondylaea paraguayana — Figueiras (1965), Quintana (1982)
Monocondylaea inerme — Simpson (1900)
Monocondylaea paraguayana — Simpson (1900), Figueiras (1965), Quintana (1982)
Monocondylæa minuana — Corsi (1900)
Monocondylaea parchappii — Simpson (1900), Simpson (1914)
Monocondylæa pazii — Corsi (1900)
Monocondylaea inermis — Simpson (1914)
Monocondylaea minuana — Simpson (1914), Ortmann (1921), Haas (1931), Morretes (1949), Figueiras (1965), ... Torres et al. (2018), Mansur et al. (2020), Graf & Cummings (2021), Torres et al. (2024), Campbell & Lydeard (2026)
Monocondylaea paraguayana paraguayana — Haas (1931), Haas (1969)
Monocondylea [sic] minuana — Rumi et al. (2008), Hoeh et al. (2009), Zieritz et al. (2015)