Page last updated
Wed 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!

Bivalvia | ... | Unionoidea | Unionidae | Unioninae | Anodontini | Alasmidontina | Simpsonaias

species Simpsonaias ambigua (Say, 1825): specimens
     2 available nominal species synonyms (4 total synonyms)

Recent Taxonomic Opinions

Simpsonaias ambigua — Graf & Cummings (2007), Watters et al. (2009), Bogan (2010), Cummings & Graf (2010), ITIS (2012), ... Graf & Cummings (2021), FMCS (2021), Jeratthitikul et al. (2022), Hopper et al. (2023), FMCS (2025)
Simpsonais [sic] ambigua — Whelan et al. (2023)

Range

Wide but discontinuous distribution in the Interior and Great Lakes basins of eastern North America.

Map of Georeferenced Specimens

USA

Georeferenced Genbank Vouchers

USA

NCSM_30607. (28S: KX822622, COI: KX822666, go to Genbank) USA.