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Thu 3 September 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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Bivalvia | Unionoida | Unionoidea | Unionidae | Ambleminae | Lampsilini

genus Ligumia Swainson, 1840: cladomics
     1 Recent valid species (9 total species)

Cladomics Summary

number of species = 1 (9 total)
analyzed in 34 cladograms in 20 publications
maximum number of terminals in an analysis = 1 (mean = 1, median = 1)


Zanatta & Murphy, 2006 [Publ 2672], fig. 1

** Top Monophyly Cladogram ** ** Top Sister-Group Cladogram **

iTtTbiriSoTroTroSiD
1101554722--
                                   +-- Cyrtonaias             
  +--------------------------------+                          
  |                                +-- Glebula                
  |                                                           
--+  +-------------------------------- Paetulunio             
  |  |                                                        
  |  |                             +-- Obliquaria             
  +--+  +--------------------------+                          
     |  |                          +-- Toxolasma              
     |  |                                                     
     |  |  +-------------------------- Sagittunio             
     +--+  |                                                  
        |  |              +----------- Potamilus              
        |  |              |                                   
        |  |  +-----------+        +-- Medionidus_conradicus  
        |  |  |           |  +-----+                          
        +--+  |           |  |     +-- Ptychobranchus         
           |  |           +--+                                
           |  |              |  +----- Medionidus_acutissimus 
           |  |              |  |                             
           |  |              +--+----- Lemiox                 
           |  |                 |                             
           |  |                 |  +-- Dromus                 
           +--+                 +--+                          
              |                    +-- Cyprogenia             
              |                                               
              |                 +----- Lampsilis_teres        
              |  +--------------+                             
              |  |              |  +-- Truncilla              
              |  |              +--+                          
              |  |                 +-- Ellipsaria             
              |  |                                            
              +--+  +----------------- Leaunio                
                 |  |                                         
                 |  |     +----------- Hamiota                
                 |  |     |                                   
                 |  |  +--+        +-- Lampsilis_fasciola     
                 +--+  |  |  +-----+                          
                    |  |  |  |     +-- Ortmanniana_pectorosa  
                    |  |  +--+                                
                    |  |     |  +----- Lampsilis_ornata       
                    |  |     +--+                             
                    |  |        |  +-- Lampsilis_ovata        
                    +--+        +--+                          
                       |           +-- Lampsilis_cardium      
                       |                                      
                       |        +----- Venustaconcha          
                       |  +-----+                             
                       |  |     |  +-- Obovaria               
                       |  |     +--+                          
                       +--+        +-- Epioblasma             
                          |                                   
                          |  +-------- Lampsilis_siliquoidea  
                          +--+                                
                             |  +----- Ortmanniana_ligamentina
                             +--+                             
                                |  +-- Cambarunio             
                                +--+                          
                                   +-- Ligumia_recta **          

Boyer et al., 2011 [Publ 2718], fig. 3

iTtTbiriSoTroTroSiD
110134159--
  +----------- Toxolasma            
  |                                 
  |  +-------- Obliquaria           
--+  |                              
  |  |  +----- Obovaria             
  |  |  |                           
  |  |  +----- Lampsilis_cardium    
  +--+  |                           
     |  +----- Potamilus            
     |  |                           
     |  |  +-- Epioblasma           
     |  +--+                        
     |  |  +-- Lampsilis_siliquoidea
     +--+                           
        |  +-- Ortmanniana          
        +--+                        
        |  +-- Lampsilis_higginsii  
        |                           
        |  +-- Ligumia_recta **        
        +--+                        
        |  +-- Lampsilis_teres      
        |                           
        |  +-- Ellipsaria           
        +--+                        
           +-- Truncilla            

Graf & Ó Foighil, 2000 [Publ 2648], fig. 2A

iTtTbiriSoTroTroSiD
110129118--
  +----------- Ligumia_recta **        
  |                                 
  +----------- Truncilla            
  |                                 
  |        +-- Ptychobranchus       
  +--------+                        
--+        +-- Sagittunio           
  |                                 
  |        +-- Lampsilis_siliquoidea
  |  +-----+                        
  |  |     +-- Epioblasma           
  |  |                              
  +--+  +----- Ortmanniana          
     |  |                           
     |  +----- Cambarunio           
     +--+                           
        +----- Leaunio              
        |                           
        |  +-- Lampsilis_cardium    
        +--+                        
           +-- Lampsilis_fasciola   

Walker et al., 2006 [Publ 2666], fig. 4

iTtTbiriSoTroTroSiD
11011444--
  +----------- Mesonaias    
--+                         
  |  +-------- Potamilus    
  +--+                      
     |  +----- Ligumia_recta **
     +--+                   
        |  +-- Ortmanniana  
        +--+                
           +-- Lampsilis    

Hoeh et al., 2001 [Publ 2652], fig. 14f2

iTtTbiriSoTroTroSiD
11013055--
  +----------- Ortmanniana  
--+                         
  |  +-------- Glebula      
  +--+                      
     |  +----- Potamilus    
     +--+                   
        |  +-- Ligumia_recta **
        +--+                
           +-- Toxolasma    

Graf & Ó Foighil, 2000 [Publ 2648], fig. 2B

iTtTbiriSoTroTroSiD
110129118--
  +-------------------- Truncilla            
  |                                          
--+  +----------------- Ligumia_recta **        
  |  |                                       
  |  |              +-- Ptychobranchus       
  +--+  +-----------+                        
     |  |           +-- Sagittunio           
     |  |                                    
     +--+  +----------- Lampsilis_siliquoidea
        |  |                                 
        |  |     +----- Ortmanniana          
        +--+  +--+                           
           |  |  |  +-- Lampsilis_cardium    
           |  |  +--+                        
           +--+     +-- Lampsilis_fasciola   
              |                              
              |  +----- Epioblasma           
              +--+                           
                 |  +-- Cambarunio           
                 +--+                        
                    +-- Leaunio              

Bogan & Hoeh, 2000 [Publ 2650], fig. 1

iTtTbiriSoTroTroSiD
11013355--
  +----- Potamilus    
--+                   
  |  +-- Ortmanniana  
  +--+                
     +-- Ligumia_recta **

Inoue et al., 2020 [Publ 4128], fig. 3

iTtTbiriSoTroTroSiD
1101211010--
  +----------------------- Cyrtonaias    
  |                                      
--+  +-------------------- Ptychobranchus
  |  |                                   
  +--+  +----------------- Ligumia_recta ** 
     |  |                                
     +--+  +-------------- Potamilus     
        |  |                             
        +--+  +----------- Pachynaias    
           |  |                          
           |  |        +-- Epioblasma    
           +--+  +-----+                 
              |  |     +-- Truncilla     
              |  |                       
              +--+     +-- Mesonaias     
                 |  +--+                 
                 |  |  +-- Cambarunio    
                 +--+                    
                    |  +-- Ortmanniana   
                    +--+                 
                       +-- Lampsilis     

Inoue et al., 2020 [Publ 4128], fig. 2

iTtTbiriSoTroTroSiD
1101221111--
           +-- Glebula       
  +--------+                 
  |        +-- Cyrtonaias    
  |                          
--+  +-------- Potamilus     
  |  |                       
  |  |     +-- Ptychobranchus
  +--+  +--+                 
     |  |  +-- Truncilla     
     |  |                    
     |  |  +-- Ortmanniana   
     +--+  |                 
        |  +-- Epioblasma    
        |  |                 
        |  +-- Lampsilis     
        |  |                 
        +--+-- Ligumia_recta ** 
           |                 
           +-- Cambarunio    
           |                 
           +-- Pachynaias    
           |                 
           +-- Mesonaias     

Campbell et al., 2005 [Publ 2660], fig. 2

iTtTbiriSoTroTroSiD
11011014222--
           +----- Obliquaria                    
  +--------+                                    
  |        |  +-- Cyrtonaias                    
  |        +--+                                 
  |           +-- Glebula                       
  |                                             
  |  +----------- Sagittunio                    
  |  |                                          
  |  +----------- Leaunio                       
  |  |                                          
  |  +----------- Potamilus                     
  |  |                                          
  |  +----------- Hamiota                       
  |  |                                          
  |  |        +-- Ellipsaria                    
--+  +--------+                                 
  |  |        +-- Truncilla                     
  |  |                                          
  |  |     +----- Lampsilis_teres               
  |  +-----+                                    
  |  |     |  +-- Ortmanniana_ligamentina       
  |  |     +--+                                 
  |  |        +-- Lampsilis_siliquoidea         
  |  |                                          
  |  |     +----- Villosa                       
  |  +-----+                                    
  |  |     |  +-- Ligumia_recta **                 
  |  |     +--+                                 
  |  |        +-- Cambarunio                    
  |  |                                          
  +--+  +-------- Ortmanniana_pectorosa         
     +--+                                       
     |  |  +----- Lampsilis_ornata              
     |  +--+                                    
     |     |  +-- Lampsilis_cardium             
     |     +--+                                 
     |        +-- Lampsilis_ovata               
     |                                          
     |  +-------- Obovaria_olivaria             
     |  |                                       
     |  +-------- Venustaconcha_ellipsiformis__2
     +--+                                       
     |  +-------- Epioblasma                    
     |  |                                       
     |  |  +----- Obovaria_unicolor             
     |  +--+                                    
     |     |  +-- Obovaria_arkansasensis        
     |     +--+                                 
     |        +-- Obovaria_subrotunda           
     |                                          
     |        +-- Ptychobranchus                
     |  +-----+                                 
     |  |     +-- Venustaconcha_ellipsiformis__1
     |  |                                       
     +--+  +----- Medionidus_conradicus         
        |  |                                    
        |  |  +-- Lemiox                        
        +--+--+                                 
           |  +-- Medionidus_acutissimus        
           |                                    
           |  +-- Dromus                        
           +--+                                 
              +-- Cyprogenia                    

Walker et al., 2006 [Publ 2666], fig. 6

iTtTbiriSoTroTroSiD
11013544--
  +-------- Potamilus    
--+                      
  |  +----- Lampsilis    
  +--+                   
     |  +-- Ligumia_recta **
     +--+                
        +-- Ortmanniana  

Gangloff et al., 2013 [Publ 3551], fig. 2

iTtTbiriSoTroTroSiD
1101332--
  +----- Venustaconcha
--+                   
  |  +-- Ligumia_recta **
  +--+                
     +-- Sagittunio   

Hoeh et al., 2009 [Publ 2716], fig. 4

iTtTbiriSoTroTroSiD
11014577--
  +----------------- Ptychobranchus
--+                                
  |  +-------------- Truncilla     
  +--+                             
     |  +----------- Ortmanniana   
     +--+                          
        |  +-------- Lampsilis     
        +--+                       
           |  +----- Cambarunio    
           +--+                    
              |  +-- Ligumia_recta ** 
              +--+                 
                 +-- Epioblasma    

Hoeh et al., 2002 [Publ 2653], fig. 2

iTtTbiriSoTroTroSiD
11013055--
  +----- Potamilus    
--+                   
  |  +-- Ligumia_recta **
  +--+                
     +-- Ortmanniana  

Hoeh et al., 2002 [Publ 2673], fig. 1-M

iTtTbiriSoTroTroSiD
1101844--
  +----------- Potamilus    
--+                         
  |  +-------- Cyrtonaias   
  +--+                      
     |  +----- Ligumia_recta **
     +--+                   
        |  +-- Lampsilis    
        +--+                
           +-- Ortmanniana  

Jadhav & Jamkhedkar, 2009 [Publ 3697], fig. 11

iTtTbiriSoTroTroSiD
11012477--
  +----------- Truncilla    
  |                         
--+        +-- Lampsilis    
  |  +-----+                
  |  |     +-- Epioblasma   
  +--+                      
     |  +----- Ligumia_recta **
     +--+                   
        |  +-- Obliquaria   
        +--+                
           +-- Ortmanniana  

Roe & Hoeh, 2003 [Publ 2655], fig. 4f2

iTtTbiriSoTroTroSiD
11013055--
  +----------- Ortmanniana  
--+                         
  |  +-------- Glebula      
  +--+                      
     |  +----- Potamilus    
     +--+                   
        |  +-- Ligumia_recta **
        +--+                
           +-- Toxolasma    

Hoeh et al., 2009 [Publ 2716], fig. 5

iTtTbiriSoTroTroSiD
11014566--
  +----- Truncilla     
  |                    
  +----- Ptychobranchus
--+                    
  |  +-- Ortmanniana   
  |  |                 
  |  +-- Cambarunio    
  +--+                 
     +-- Ligumia_recta ** 
     |                 
     +-- Epioblasma    

Hoeh et al., 2009 [Publ 2716], fig. 3

iTtTbiriSoTroTroSiD
11014677--
  +----------------- Ptychobranchus
--+                                
  |  +-------------- Truncilla     
  +--+                             
     |  +----------- Ortmanniana   
     +--+                          
        |  +-------- Lampsilis     
        +--+                       
           |  +----- Cambarunio    
           +--+                    
              |  +-- Ligumia_recta ** 
              +--+                 
                 +-- Epioblasma    

Boyer et al., 2011 [Publ 2718], fig. 4

iTtTbiriSoTroTroSiD
110137159--
  +----------------- Potamilus            
  |                                       
  |              +-- Ellipsaria           
--+  +-----------+                        
  |  |           +-- Truncilla            
  |  |                                    
  +--+  +----------- Lampsilis_cardium    
     |  |                                 
     |  |     +----- Ligumia_recta **        
     |  +-----+                           
     +--+     |  +-- Obovaria             
        |     +--+                        
        |        +-- Epioblasma           
        |                                 
        |  +-------- Lampsilis_teres      
        +--+                              
           |  +----- Lampsilis_siliquoidea
           +--+                           
              |  +-- Ortmanniana          
              +--+                        
                 +-- Lampsilis_higginsii  

Walker et al., 2006 [Publ 2666], fig. 2

iTtTbiriSoTroTroSiD
11011444--
  +----------- Mesonaias    
--+                         
  |  +-------- Potamilus    
  +--+                      
     |  +----- Ligumia_recta **
     +--+                   
        |  +-- Ortmanniana  
        +--+                
           +-- Lampsilis    

Walker et al., 2006 [Publ 2666], fig. 3

iTtTbiriSoTroTroSiD
11011444--
  +----------- Potamilus    
--+                         
  |  +-------- Mesonaias    
  +--+                      
     |  +----- Ligumia_recta **
     +--+                   
        |  +-- Ortmanniana  
        +--+                
           +-- Lampsilis    

Grobler et al., 2011 [Publ 3359], fig. 2

iTtTbiriSoTroTroSiD
110116159--
        +-------- Lemiox               
  +-----+                              
  |     |  +----- Medionidus           
  |     +--+                           
  |        |  +-- Dromus               
  |        +--+                        
--+           +-- Cyprogenia           
  |                                    
  |  +----------- Potamilus            
  |  |                                 
  |  |     +----- Lampsilis_siliquoidea
  |  |  +--+                           
  +--+  |  |  +-- Lampsilis_higginsii  
     |  |  +--+                        
     |  |     +-- Ortmanniana          
     |  |                              
     |  |  +----- Lampsilis_fasciola   
     +--+--+                           
        |  |  +-- Lampsilis_cardium    
        |  +--+                        
        |     +-- Lampsilis_ovata      
        |                              
        |     +-- Cambarunio           
        |     |                        
        +-----+-- Ligumia_recta **        
              |                        
              +-- Epioblasma           

Graf & Cummings, 2006 [Publ 1968], fig. 2

iTtTbiriSoTroTroSiD
11014677--
  +-------------- Obliquaria    
  |                             
  +-------------- Truncilla     
--+                             
  +-------------- Ptychobranchus
  |                             
  |  +----------- Ligumia_recta ** 
  +--+                          
     |  +-------- Cambarunio    
     +--+                       
        |  +----- Epioblasma    
        +--+                    
           |  +-- Lampsilis     
           +--+                 
              +-- Ortmanniana   

Roe et al., 2002 [Publ 2689], fig. 3a

iTtTbiriSoTroTroSiD
1101994--
  +----- Ligumia_recta **
  |                   
  +----- Obliquaria   
--+                   
  +----- Lampsilis    
  |                   
  |  +-- Villosa      
  +--+                
     +-- Hamiota      

Campbell et al., 2005 [Publ 2660], fig. 1

iTtTbiriSoTroTroSiD
11011014222--
                       +-------- Toxolasma                     
  +--------------------+                                       
  |                    |  +----- Obliquaria                    
  |                    +--+                                    
  |                       |  +-- Cyrtonaias                    
  |                       +--+                                 
  |                          +-- Glebula                       
  |                                                            
  |              +-------------- Potamilus                     
  |              |                                             
  |              |     +-------- Medionidus_acutissimus        
--+              |  +--+                                       
  |  +-----------+  |  |  +----- Lemiox                        
  |  |           |  |  +--+                                    
  |  |           |  |     |  +-- Dromus                        
  |  |           |  |     +--+                                 
  |  |           +--+        +-- Cyprogenia                    
  |  |              |                                          
  |  |              |        +-- Sagittunio                    
  |  |              |     +--+                                 
  |  |              |     |  +-- Medionidus_conradicus         
  +--+              +-----+                                    
     |                    |  +-- Ptychobranchus                
     |                    +--+                                 
     |                       +-- Venustaconcha_ellipsiformis__2
     |                                                         
     |                       +-- Ellipsaria                    
     |  +--------------------+                                 
     |  |                    +-- Truncilla                     
     |  |                                                      
     |  |  +-------------------- Villosa                       
     +--+  |                                                   
        |  |                 +-- Obovaria_olivaria             
        |  |        +--------+                                 
        |  |        |        +-- Venustaconcha_ellipsiformis__1
        |  |  +-----+                                          
        +--+  |     |  +-------- Epioblasma                    
           |  |     +--+                                       
           |  |        |  +----- Obovaria_unicolor             
           |  |        +--+                                    
           |  |           |  +-- Obovaria_arkansasensis        
           |  |           +--+                                 
           |  |              +-- Obovaria_subrotunda           
           +--+                                                
              |        +-------- Hamiota                       
              |        |                                       
              |  +-----+     +-- Lampsilis_cardium             
              |  |     |  +--+                                 
              |  |     |  |  +-- Lampsilis_ovata               
              |  |     +--+                                    
              |  |        |  +-- Ortmanniana_pectorosa         
              +--+        +--+                                 
                 |           +-- Lampsilis_ornata              
                 |                                             
                 |           +-- Ligumia_recta **                 
                 |  +--------+                                 
                 |  |        +-- Cambarunio                    
                 +--+                                          
                    |  +-------- Lampsilis_teres               
                    +--+                                       
                       |  +----- Ortmanniana_ligamentina       
                       +--+                                    
                          |  +-- Lampsilis_siliquoidea         
                          +--+                                 
                             +-- Leaunio                       

Pfeiffer et al., 2019 [Publ 3866], fig. 1

iTtTbiriSoTroTroSiD
1101301111--
                       +-- Cyrtonaias    
  +--------------------+                 
  |                    +-- Glebula       
--+                                      
  |  +-------------------- Potamilus     
  |  |                                   
  +--+                 +-- Truncilla     
     |  +--------------+                 
     |  |              +-- Ptychobranchus
     +--+                                
        |  +-------------- Pachynaias    
        |  |                             
        +--+  +----------- Mesonaias     
           |  |                          
           +--+        +-- Lampsilis     
              |  +-----+                 
              |  |     +-- Ortmanniana   
              +--+                       
                 |  +----- Cambarunio    
                 +--+                    
                    |  +-- Epioblasma    
                    +--+                 
                       +-- Ligumia_recta ** 

Szumowski et al., 2012 [Publ 3569], fig. 4

iTtTbiriSoTroTroSiD
110115149--
  +----------------------- Ellipsaria           
  |                                             
--+  +-------------------- Truncilla            
  |  |                                          
  +--+  +----------------- Obliquaria           
     |  |                                       
     |  |  +-------------- Potamilus            
     +--+  |                                    
        |  |        +----- Lampsilis_ornata     
        |  |  +-----+                           
        |  |  |     |  +-- Lampsilis_cardium    
        +--+  |     +--+                        
           |  |        +-- Lampsilis_ovata      
           |  |                                 
           |  |  +-------- Lampsilis_teres      
           |  +--+                              
           +--+  |  +----- Lampsilis_siliquoidea
              |  +--+                           
              |     |  +-- Ortmanniana          
              |     +--+                        
              |        +-- Lampsilis_higginsii  
              |                                 
              |     +----- Hamiota              
              |     |                           
              +-----+  +-- Epioblasma           
                    |  |                        
                    +--+-- Cambarunio           
                       |                        
                       +-- Ligumia_recta **        

Roe & Hoeh, 2003 [Publ 2655], fig. 4f3

iTtTbiriSoTroTroSiD
11013055--
           +-- Cyrtonaias   
  +--------+                
  |        +-- Glebula      
--+                         
  |  +-------- Toxolasma    
  +--+                      
     |  +----- Ortmanniana  
     +--+                   
        |  +-- Ligumia_recta **
        +--+                
           +-- Potamilus    

Smith et al., 2019 [Publ 3951], fig. 2

iTtTbiriSoTroTroSiD
1101403519--
  +----------------------- Obliquaria             
  |                                               
  |                    +-- Medionidus             
  |                 +--+                          
  |                 |  +-- Lemiox                 
--+  +--------------+                             
  |  |              |  +-- Cyprogenia             
  |  |              +--+                          
  |  |                 +-- Ptychobranchus         
  |  |                                            
  +--+           +-------- Potamilus              
     |  +--------+                                
     |  |        |  +----- Atlanticoncha          
     |  |        +--+                             
     |  |           |  +-- Ellipsaria             
     |  |           +--+                          
     +--+              +-- Truncilla              
        |                                         
        |              +-- Hamiota                
        |  +-----------+                          
        |  |           +-- Villosa                
        |  |                                      
        +--+  +----------- Ligumia_recta **          
           |  |                                   
           |  |     +----- Venustaconcha          
           +--+  +--+                             
              |  |  |  +-- Obovaria               
              |  |  +--+                          
              +--+     +-- Epioblasma             
                 |                                
                 |  +----- Ortmanniana_pectorosa  
                 +--+                             
                    |  +-- Ortmanniana_ligamentina
                    +--+                          
                       +-- Lampsilis              

Hoeh et al., 2002 [Publ 2673], fig. 1-F

iTtTbiriSoTroTroSiD
1101844--
  +----------- Cyrtonaias   
--+                         
  |  +-------- Ortmanniana  
  +--+                      
     |  +----- Lampsilis    
     +--+                   
        |  +-- Potamilus    
        +--+                
           +-- Ligumia_recta **

Hoeh et al., 2001 [Publ 2652], fig. 14f4

iTtTbiriSoTroTroSiD
11013055--
           +-- Cyrtonaias   
  +--------+                
  |        +-- Glebula      
--+                         
  |  +-------- Toxolasma    
  +--+                      
     |  +----- Potamilus    
     +--+                   
        |  +-- Ligumia_recta **
        +--+                
           +-- Ortmanniana  

Walker et al., 2006 [Publ 2666], fig. 6-M

iTtTbiriSoTroTroSiD
11011344--
  +----------- Potamilus    
--+                         
  |  +-------- Cyrtonaias   
  +--+                      
     |  +----- Ligumia_recta **
     +--+                   
        |  +-- Lampsilis    
        +--+                
           +-- Ortmanniana  

Zanatta & Murphy, 2006 [Publ 2672], fig. 2

iTtTbiriSoTroTroSiD
1101564722--
                                      +-- Paetulunio             
  +-----------------------------------+                          
  |                                   +-- Toxolasma              
  |                                                              
  |                                +----- Obliquaria             
  |  +-----------------------------+                             
--+  |                             |  +-- Glebula                
  |  |                             +--+                          
  |  |                                +-- Cyrtonaias             
  |  |                                                           
  |  |                             +----- Ptychobranchus         
  |  |                          +--+                             
  +--+                          |  |  +-- Dromus                 
     |                          |  +--+                          
     |  +-----------------------+     +-- Cyprogenia             
     |  |                       |                                
     |  |                       |  +----- Medionidus_conradicus  
     |  |                       +--+                             
     |  |                          |  +-- Medionidus_acutissimus 
     |  |                          +--+                          
     +--+                             +-- Lemiox                 
        |                                                        
        |  +----------------------------- Sagittunio             
        |  |                                                     
        |  +----------------------------- Potamilus              
        |  |                                                     
        |  |                          +-- Truncilla              
        +--+  +-----------------------+                          
           |  |                       +-- Ellipsaria             
           |  |                                                  
           |  |                       +-- Ortmanniana_pectorosa  
           |  |                 +-----+                          
           |  |                 |     +-- Lampsilis_fasciola     
           +--+  +--------------+                                
              |  |              |  +----- Lampsilis_ornata       
              |  |              +--+                             
              |  |                 |  +-- Lampsilis_ovata        
              |  |                 +--+                          
              |  |                    +-- Lampsilis_cardium      
              +--+                                               
                 |                    +-- Ligumia_recta **          
                 |                 +--+                          
                 |                 |  +-- Cambarunio             
                 |  +--------------+                             
                 |  |              |  +-- Lampsilis_teres        
                 |  |              +--+                          
                 +--+                 +-- Hamiota                
                    |                                            
                    |  +----------------- Leaunio                
                    |  |                                         
                    +--+  +-------------- Ortmanniana_ligamentina
                       |  |                                      
                       +--+  +----------- Lampsilis_siliquoidea  
                          |  |                                   
                          +--+  +-------- Obovaria_olivaria      
                             |  |                                
                             |  +-------- Venustaconcha          
                             +--+                                
                                +-------- Epioblasma             
                                |                                
                                |  +----- Obovaria_unicolor      
                                +--+                             
                                   |  +-- Obovaria_subrotunda    
                                   +--+                          
                                      +-- Obovaria_arkansasensis 
 
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