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Page last updated
Thu 17 July 2025

The Freshwater Mussels (Unionoida) of the World (and other less consequential bivalves)

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Publication Say (1817): summary
     publication summary

Complete Citation

Say, T. 1817. Conchology. [in] W. Nicholson (ed.), American Edition of the British Encyclopedia or Dictionary of Arts and Sciences, Comprising an Accurate and Popular View of the Present Improved State of Human Knowledge 2 (1st ed.). 15 [unumbered] pp. Available electronically.

Attributed Nominal Genera

Monodonta Say, 1817
Say, 1817. Nich. Encyc. 2: [13].
(homonym of Lamarck, 1801 [Gastrop.]; renamed Alasmidonta Say, 1818)
Type species: Unio undulata Say, 1817 (orig. desig.) = Alasmidonta undulata

Attributed Nominal Species

There are 15 available nominal species attributed to this publication (15 total).
Click here for a complete list.

Taxonomic Opinions

Anodonta cataracta Say, 1817 = Pyganodon cataracta

Anodonta marginata Say, 1817 = Pyganodon cataracta

Anodonta undulata Say, 1817 = Strophitus undulatus

Monodonta undulata (Say, 1817) = Alasmidonta undulata

Unio alatus Say, 1817 = Potamilus alatus

Unio cariosus Say, 1817 = Lampsilis cariosa
+ Mya radiata Gmelin, 1791

Unio crassus Say, 1817 = Ortmanniana ligamentina

Unio crassus var. plicata Say, 1817 = Amblema plicata

Unio cylindricus Say, 1817 = Theliderma cylindrica

Unio nasutus Say, 1817 = Sagittunio nasutus

Unio ochraceus Say, 1817 = Atlanticoncha ochracea

Unio ovatus Say, 1817 = Lampsilis ovata

Unio purpureus Say, 1817 = Elliptio complanata

 
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