| 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!
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South America The region is inhabited by 115 species (19
genera) in three families: Hyriidae,
Mycetopodidae and Etheriidae.
South America is composed of six subregions. The Magdalena-Pacific
Subregion (SA1; 5 gen., 12 spp., 5 endemic) is the area between
the Isthmus of Panama and the Andes Mountains in the northwest. The
Orinoco-Guayana Subregion (SA2; 10 gen., 31 spp., 17 endemic)
includes the Orinoco basin east to the Guayanas. These basins are north
of the Amazon Subregion (SA3; 16 gen., 37 spp., 12 endemic),
composed of the whole Amazon Basin. The Atlantic coastal streams
(including the São Francisco) in eastern Brazil comprise the
São Francisco-Atlantic Subregion (SA4; 5 gen., 17 spp., 4 endemic). The Paraná-Paraguay Subregion (SA5; 11 gen., 63 spp., 42 endemic) is composed of all the rivers draining via the Rio de la Plata
and the coastal streams of Uruguay and southern Brazil. Finally,
the Patagonia Subregion (SA6; 2 gen., 3 spp., 2 endemic)
includes southern Argentina and Chile. Endemic species are marked with an asterisk (*). Magdalena-Pacific (SA1)Orinoco-Guayana (SA2)Amazon (SA3)São Francisco-Atlantic (SA4)Paraná-Paraguay (SA5)Patagonia (SA6)
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