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 | Lampsilini | Ortmanniana ligamentina nominal species Unio callosus Lea, 1841  Lea, 1841. Proc. Amer. Phil. Soc. 2: 31.
 Lea, 1842. Trans. Amer. Phil. Soc. 8 [O. 3]: 239 [77], pl. 23, fig. 54.
Type(s): HOLOTYPE (MONOTYPY) AMNH_30561, Ohio Canal, 12 mi below Columbus, Franklin Co., Ohio.
= Ortmanniana ligamentina Taxonomic Opinions+ — Cummings et al., 2025 = Sphenonaias callosa (Lea, 1841) — Graf & Cummings, 2021 + Actinonaias ligamentina — Inoue et al., 2020 = Sphenonaias callosa (Lea, 1841) — Graf & Cummings, 2007 + Nephronaias (Sphenonaias) mexicana (Philippi, 1847) — Haas, 1969 = Elliptio (Sphenonaias) callosus (Lea, 1841) — Frierson, 1927 = Unio (sec. Elliptio) callosus Lea, 1841 — Simpson, 1914 = Unio (sec. Elliptio) callosus Lea, 1841 — Simpson, 1900 = Unio (Simonaias) callosus Lea, 1841 — Martens, 1900 = Unio callosus Lea — B.H. Wright, 1888 = Margaron (Unio) callosus (Lea) — Lea, 1870 = Unio (Niäa) callosus Lea — Adams & Adams, 1857 = Unio callosus Lea, 1841 — Conrad, 1853 = Margaron (Unio) callosus (Lea) — Lea, 1852
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