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Page last updated
5 August
2015

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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 search fields. Either way, you win!

Taxa known only as fossils are highlighted in gray. Those without representatives in fresh waters are highlighted in gold.

 

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Bivalvia
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Bivalvia: orders

Arcoida: 1 family
Arcoids are primarily marine. However, one family is represented in fresh waters.

Myoida: 5 families
Myoids are also primarily marine bivalves, but there are freshwater species as well.

Mytiloida: 1 family
There are a few secondarily freshwater species in this order, but otherwise mytiloids are primarily marine.

Pectinoida: 1 family
An order of bivalves that has freshwater species or at least species attributed to freshwater clades.

Pterioida: 1 family
There are not really any freshwater pterioids, but at least one fossil family has been assigned to a freshwaterclade.

Unionoida: 12 families
These are the freshwater mussels. There are six modern families, restricted entirely to fresh waters. In addition, there are several fossil families.

unknown: 2 families
Some bivalve families (typically fossils) can't be convincingly assigned to an order at this time.

Veneroida: 20 families
There are several groups of freshwater veneroids, including Sphaeriidae, Cyrenidae (= Corbiculidae) and Dreissenidae. There are also a number of freshwater species in primarily marine families.

 
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