| Page last updatedWed 1 October 2025
 | The Freshwater Mussels (Unionoida) of the World (and other less consequential bivalves)FM(U)otW(aolcb) is the web version of the MUSSEL Project Database. Follow the links to browse the data or use the custom Google search field. Either way, you win! 
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 Bivalvia | Unionoida | Etherioidea | Iridinidae | Aspathariinae | Chambardia trapezia nominal species Spathopsis trapezia ovoidea Mandahl-Barth, 1988 = Chambardia trapezia Taxonomic Opinions= Chambardia trapezia ovoidea (Mandahl-Barth, 1988) — Graf & Cummings, 2007 = Chambardia trapezia ovoidea (Mandahl-Barth, 1988) — Daget, 1998 = Spathopsis trapezia ovoidea Mandahl-Barth, 1988 — Mandahl-Barth, 1988 |