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Unio ambigua Blainville, 1825

Blainville, 1825. Manuel Malacol. et Conch.: 539, pl. 67, fig. 4.
(misidentified reference to Castalia ambigua Lamarck, 1819)

Tetraplodon multisulcatus — Simpson (1914)

Castalia multisulcata Hupé, 1857

Hupé, 1857. [in] Castelnau, Anim. Nouv. Rares d’Amer. Sud: 75, pl. 14, fig. 4.
Type(s): SYNTYPES MNHN-IM-2000-35484, Rio Mondego, (Bresil).

Tetraplodon multisulcatus — Simpson (1900), Ihering (1910), Simpson (1914)
Castalia multisulcata — Haas (1931), Morretes (1949), Haas (1969), Mansur (1991), Mansur & Valer (1992), ... Lasso et al. (2009), Bogan (2010), Pereira et al. (2014), Mansur et al. (2020), Graf & Cummings (2021)
Castalia (s.s.) ambigua multisulcata — Modell (1950)
Castalia ambigua multisulcata — Bonetto (1965)

Castalia multicostata Sowerby, 1869

‘Hupé’ Sowerby, 1869. Conch. Icon. 17: pl. 2, sp. 9, figs. 9a-b.
(error for Castalia multisulcata Hupé, 1857)

Tetraplodon multisulcatus — Simpson (1900), Ihering (1910), Simpson (1914)
Castalia (s.s.) ambigua multisulcata — Modell (1950)
Castalia multisulcata — Ramírez et al. (2003), Simone (2006)