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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 | Quadrula

species Quadrula fragosa (Conrad, 1836): synonymy
     1 specimen + 18 Genbank vouchers

Unio fragosus Conrad, 1835
Conrad, 1835. Monogr. Fam. Unionidae 1(1): 12, pl. 6, fig. 2.
Conrad, 1853. Proc. Acad. Nat. Sci. 6: 249.

Quadrula (sec. Theliderma) fragosusSimpson (1900)
Unio (s.s.) fragosusCall (1900)
Quadrula (sec. Theliderma) fragosaSimpson (1914)
Quadrula fragosaUtterback (1915), Ortmann (1924), Turgeon et al. (1988), Cummings & Mayer (1992), Williams et al. (1993), ... FMCS (2021), Neemuchwala et al. (2023), Hopper et al. (2023), Keogh et al. (2024), FMCS (2025)
Quadrula quadrula fragosaOrtmann (1925)
Quadrula (s.s.) quadrula-fragosaFrierson (1927)
Quadrula (s.s.) fragosusF.C. Baker (1928)
Quadrula (s.s.) quadrula fragosaHaas (1969)
Quadrula quadrulaBurch (1975), R.I. Johnson (1980), Howells et al. (1996)

Margarita (Unio) fragrosus Lea, 1836
‘Con.’ Lea, 1836. Synopsis Fam. Naiades: 14 [corrected in the errata].
(error for Unio fragosus Conrad, 1835)

Quadrula fragosaWatters et al. (2009)

Unio tragosus Hanley, 1843
‘Conrad’ Hanley, 1843. Illustr. Descr. Cat. Rec. Bivalve Shells: 178, pl. 20, fig. 40.
(error for Unio fragosus Conrad, 1835)

Quadrula (sec. Theliderma) fragosusSimpson (1900)
Quadrula (sec. Theliderma) fragosaSimpson (1914)
Quadrula fragosaWatters et al. (2009)

Quadrula fragosa Scammon, 1906
‘Conrad’ Scammon, 1906. KS Univ. Sci. Bull. 3(9): ??.
(reference to Unio fragosus Conrad, 1835)

Quadrula quadrulaMurray & Leonard (1962), Vidrine (1993)

Taxonomic History (since 1900)

Quadrula (sec. Theliderma) fragosusSimpson (1900)
Unio (s.s.) fragosusCall (1900)
Quadrula (sec. Theliderma) fragosaSimpson (1914)
Quadrula fragosaUtterback (1915), Ortmann (1924), Turgeon et al. (1988), Cummings & Mayer (1992), Williams et al. (1993), ... FMCS (2021), Neemuchwala et al. (2023), Hopper et al. (2023), Keogh et al. (2024), FMCS (2025)
Quadrula quadrula fragosaOrtmann (1925)
Quadrula (s.s.) quadrula-fragosaFrierson (1927)
Quadrula (s.s.) fragosusF.C. Baker (1928)
Quadrula quadrulaMurray & Leonard (1962), Burch (1975), R.I. Johnson (1980), Vidrine (1993), Howells et al. (1996)
Quadrula (s.s.) quadrula fragosaHaas (1969)

 
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