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Page last updated
Thu 3 September 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 | ... | Unionoidea | Unionidae | Ambleminae | Quadrulini | Quadrulina | Theliderma

species Theliderma stapes (Lea, 1831): synonymy
     1 specimen

Unio stapes Lea, 1831
Lea, 1831. Trans. Amer. Phil. Soc. 4 [O. 1]: 77, pl. 7, fig. 8.
Type(s): HOLOTYPE (MONOTYPY) USNM_84218, Alabama R., Ala.

Quadrula (s.s.) stapesSimpson (1900), Simpson (1914)
Quadrula (Orthonymus) stapesFrierson (1927)
Orthonymus stapesHaas (1969)
Quadrula stapesBurch (1975), Turgeon et al. (1988), Williams et al. (1993), Turgeon et al. (1998), Lydeard et al. (1999), Jones et al. (2005), Williams et al. (2008), Bogan (2010), ITIS (2012), Haag (2012)
Theliderma stapesIUCN (1996), Graf & Cummings (2007), Cummings & Graf (2010), Williams et al. (2017), Lopes-Lima et al. (2019), Graf & Cummings (2021), FMCS (2021), Neemuchwala et al. (2023), Hopper et al. (2023), FMCS (2025)

Unio retusus Say, 1834
Say, 1834. Amer. Conch. 6: ??.
(misidentified reference to Unio retusa Lamarck, 1819)

Quadrula (s.s.) stapesSimpson (1900), Simpson (1914)

Unio stegarius Küster, 1861
‘Rafinesque’ Küster, 1861. Conchyl. Cab. 9(2): 211, pl. 70, fig. 3.
(misidentified reference to Obovaria stegaria Rafinesque, 1820)

Quadrula (s.s.) stapesSimpson (1900), Simpson (1914)

Taxonomic History (since 1900)

Quadrula (s.s.) stapesSimpson (1900), Simpson (1914)
Quadrula (Orthonymus) stapesFrierson (1927)
Orthonymus stapesHaas (1969)
Quadrula stapesBurch (1975), Turgeon et al. (1988), Williams et al. (1993), Turgeon et al. (1998), Lydeard et al. (1999), Jones et al. (2005), Williams et al. (2008), Bogan (2010), ITIS (2012), Haag (2012)
Theliderma stapesIUCN (1996), Graf & Cummings (2007), Cummings & Graf (2010), Williams et al. (2017), Lopes-Lima et al. (2019), Graf & Cummings (2021), FMCS (2021), Neemuchwala et al. (2023), Hopper et al. (2023), FMCS (2025)

 
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