| 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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 Publication Breton et al. (2011): cladogramspublication summary | cladograms
 Complete CitationBreton, S., D.T. Stewart, S. Shepardson, R.J. Trdan, A.E. Bogan et al. 2011. Novel protein genes in animal mtDNA: a new sex determination system in freshwater mussels (Bivalvia: Unionoida)? Molecular Biology and Evolution 28(5): 1645-1659. Available electronically. Cladogram Figures(click the figure number to see the cladogram) Cladogram Figure 3  +-------------------------------------- Echyridella_menziesii      
  |                                                                  
  |                             +-------- Cumberlandia_monodonta     
  |  +--------------------------+                                    
  |  |                          |  +----- Margaritifera_margaritifera
  |  |                          +--+                                 
--+  |                             |  +-- Margaritifera_falcata      
  |  |                             +--+                              
  |  |                                +-- Margaritifera_marrianae    
  |  |                                                               
  |  |                             +----- Quadrula_quadrula          
  |  |  +--------------------------+                                 
  +--+  |                          |  +-- Cyclonaias_tuberculata     
     |  |                          +--+                              
     |  |                             +-- Pustulosa_pustulosa        
     |  |                                                            
     |  |     +-------------------------- Pronodularia_japanensis    
     |  |     |                                                      
     |  |  +--+  +----------------------- Sinohyriopsis_cumingii     
     |  |  |  |  |                                                   
     |  |  |  +--+  +-------------------- Cristaria_plicata          
     |  |  |     |  |                                                
     +--+  |     |  |                 +-- Pterosyna_complanata       
        |  |     +--+  +--------------+                              
        |  |        |  |              +-- Lasmigona_costata          
        |  |        |  |                                             
        |  |        +--+  +-------------- Strophitus_undulatus       
        |  |           |  |                                          
        |  |           |  |           +-- Platynaias_compressa       
        |  |           |  |        +--+                              
        |  |           +--+        |  +-- Platynaias_subviridis      
        |  |              |  +-----+                                 
        |  |              |  |     |  +-- Alasmidonta_marginata      
        +--+              |  |     +--+                              
           |              |  |        +-- Alasmidonta_undulata       
           |              +--+                                       
           |                 |        +-- Pyganodon_lacustris        
           |                 |  +-----+                              
           |                 |  |     +-- Pyganodon_grandis          
           |                 +--+                                    
           |                    |  +----- Utterbackia_peninsularis__2
           |                    +--+                                 
           |                       |  +-- Utterbackia_peninsularis__1
           |                       +--+                              
           |                          +-- Utterbackia_imbecillis     
           |                                                         
           |  +-------------------------- Megalonaias_nervosa        
           |  |                                                      
           +--+  +----------------------- Fusconaia_flava            
              |  |                                                   
              +--+  +-------------------- Reginaia_ebenus            
                 |  |                                                
                 |  |           +-------- Toxolasma_paulum__2        
                 +--+  +--------+                                    
                    |  |        |  +----- Toxolasma_lividum          
                    |  |        +--+                                 
                    |  |           |  +-- Toxolasma_parvum           
                    +--+           +--+                              
                       |              +-- Toxolasma_paulum__1        
                       |                                             
                       |  +-------------- Ellipsaria_lineolata       
                       |  |                                          
                       +--+  +----------- Truncilla_macrodon         
                          |  |                                       
                          |  |        +-- Lemiox_rimosus             
                          +--+  +-----+                              
                             |  |     +-- Potamilus_metnecktayi      
                             |  |                                    
                             +--+     +-- Cambarunio_iris            
                                |  +--+                              
                                |  |  +-- Venustaconcha_ellipsiformis
                                +--+                                 
                                   |  +-- Lampsilis_powellii         
                                   |  |                              
                                   +--+-- Lampsilis_ornata           
                                      |                              
                                      +-- Lampsilis_siliquoidea      
 |