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Page last updated
Thu 7 August 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!


Bivalvia | ... | Unionoidea | Unionidae | Unioninae | Anodontini | Alasmidontina

genus Arcidens Simpson, 1900: cladomics
     2 Recent valid species (3 total species)

Cladomics Summary

number of species = 2 (3 total)
analyzed in 11 cladograms in 7 publications
maximum number of terminals in an analysis = 2 (mean = 1.55, median = 2)

Basic Monophyly

number of cladograms that test basic monophyly (i.e., more than 1 included species) = 6
maximum number of included terminals = 2, (mean = 2 median = 2)
proportion of cladograms that support basic monophyly = 0.83


Whelan et al., 2023 [Publ 4287], fig. 2

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

iTtTbiriSoTroTroSiD
2202393112--
                 +-- Utterbackia         
  +--------------+                       
  |              +-- Pyganodon           
  |                                      
  |     +----------- Utterbackiana       
  |     |                                
  |  +--+        +-- Lasmigona_costata   
--+  |  |  +-----+                       
  |  |  |  |     +-- Pseudodontoideus    
  |  |  +--+                             
  |  |     |  +----- Lasmigona_complanata
  |  |     +--+                          
  |  |        |  +-- Arcidens_confragosus **
  +--+        +--+                       
     |           +-- Arcidens_wheeleri **   
     |                                   
     |        +----- Pressodonta         
     |     +--+                          
     |     |  |  +-- Anodontoides        
     |     |  +--+                       
     |     |     +-- Strophitus          
     +-----+                             
           |     +-- Prolasmidonta       
           |  +--+                       
           |  |  +-- Platynaias          
           +--+                          
              |  +-- Alasminota          
              +--+                       
                 +-- Alasmidonta         

Whelan et al., 2023 [Publ 4287], fig. 3

iTtTbiriSoTroTroSiD
2202262511--
  +-------------------- Utterbackiana       
  |                                         
  |                 +-- Utterbackia         
--+  +--------------+                       
  |  |              +-- Pyganodon           
  |  |                                      
  |  |        +-------- Alasmidonta         
  +--+  +-----+                             
     |  |     |  +----- Pseudodontoideus    
     |  |     +--+                          
     |  |        |  +-- Arcidens_confragosus **
     +--+        +--+                       
        |           +-- Arcidens_wheeleri **   
        |                                   
        |  +----------- Alasminota          
        |  |                                
        +--+        +-- Anodontoides        
           |  +-----+                       
           |  |     +-- Strophitus          
           +--+                             
              |  +----- Pressodonta         
              +--+                          
                 |  +-- Platynaias          
                 +--+                       
                    +-- Prolasmidonta       

Inoue et al., 2014 [Publ 3635], fig. 3B

iTtTbiriSoTroTroSiD
2202652--
  +-------- Pyganodon_grandis   
  |                             
  +-------- Pyganodon_cataracta 
  |                             
--+-------- Pyganodon_fragilis  
  |                             
  +-------- Pyganodon           
  |                             
  |  +----- Platynaias          
  +--+                          
     |  +-- Arcidens_confragosus **
     +--+                       
        +-- Arcidens_wheeleri **   

Inoue et al., 2014 [Publ 3635], fig. 3A

iTtTbiriSoTroTroSiD
220218127--
     +----------- Pseudodontoideus    
  +--+                                
  |  |  +-------- Lasmigona_costata   
  |  +--+                             
  |     |  +----- Lasmigona_complanata
  |     +--+                          
--+        |  +-- Arcidens_confragosus **
  |        +--+                       
  |           +-- Arcidens_wheeleri **   
  |                                   
  |     +-------- Strophitus          
  |     |                             
  +-----+     +-- Pyganodon           
        |  +--+                       
        |  |  +-- Utterbackia         
        +--+                          
           |  +-- Platynaias          
           +--+                       
              +-- Alasmidonta         

Inoue et al., 2018 [Publ 3858], fig. 1_3a-c

iTtTbiriSoTroTroSiD
22002102148--
  +-- Alasmidonta_marginata      
  |                              
  +-- Prolasmidonta              
  |                              
  +-- Alasmidonta_undulata       
  |                              
  +-- Beringiana                 
  |                              
  +-- Anodonta_kennerlyi         
  |                              
  +-- Anodonta_nuttalliana       
  |                              
  +-- Anodonta_oregonensis       
  |                              
  +-- Arcidens_confragosus **       
  |                              
  +-- Arcidens_wheeleri **          
  |                              
  +-- Lasmigona_complanata       
  |                              
--+-- Platynaias_compressa       
  |                              
  +-- Lasmigona_costata          
  |                              
  +-- Platynaias_decorata        
  |                              
  +-- Platynaias_subviridis      
  |                              
  +-- Pyganodon_grandis          
  |                              
  +-- Pyganodon_lacustris        
  |                              
  +-- Pseudodontoideus           
  |                              
  +-- Strophitus                 
  |                              
  +-- Utterbackia_imbecillis     
  |                              
  +-- Utterbackia_peninsularis__1
  |                              
  +-- Utterbackia_peninsularis__2

Whelan et al., 2023 [Publ 4287], fig. 4

iTtTbiriSoTroTroSiD
2202252310--
  +-------------------- Pressodonta         
  |                                         
  |        +----------- Utterbackiana       
  |  +-----+                                
--+  |     |  +-------- Alasminota          
  |  |     +--+                             
  |  |        |  +----- Pseudodontoideus    
  |  |        +--+                          
  +--+           |  +-- Arcidens_confragosus **
     |           +--+                       
     |              +-- Arcidens_wheeleri **   
     |                                      
     |  +-------------- Alasmidonta         
     +--+                                   
        |  +----------- Platynaias          
        +--+                                
           |  +-------- Strophitus          
           +--+                             
              |  +----- Pyganodon           
              +--+                          
                 |  +-- Utterbackia         
                 +--+                       
                    +-- Anodontoides        

Inoue et al., 2020 [Publ 3941], fig. 3

iTtTbiriSoTroTroSiD
11014100--
-- Arcidens_confragosus **

Hewitt et al., 2018 [Publ 3758], fig. 5

iTtTbiriSoTroTroSiD
1101854--
  +-------- Pyganodon           
  |                             
  |     +-- Platynaias          
--+-----+                       
  |     +-- Strophitus          
  |                             
  |  +----- Lasmigona_costata   
  +--+                          
     |  +-- Arcidens_wheeleri **   
     +--+                       
        +-- Lasmigona_complanata

Pieri et al., 2018 [Publ 3867], fig. 3

iTtTbiriSoTroTroSiD
11011900--
-- Arcidens_confragosus **

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

iTtTbiriSoTroTroSiD
11013787--
  +-------------- Strophitus          
  |                                   
  |        +----- Lasmigona_complanata
--+  +-----+                          
  |  |     |  +-- Lasmigona_costata   
  |  |     +--+                       
  +--+        +-- Arcidens_confragosus **
     |                                
     |  +-------- Utterbackia         
     |  |                             
     +--+-------- Alasmidonta         
        |                             
        |  +----- Pyganodon           
        +--+                          
           |  +-- Anodontoides        
           +--+                       
              +-- Platynaias          

Inoue et al., 2020 [Publ 3941], fig. 4

iTtTbiriSoTroTroSiD
11014000--
-- Arcidens_confragosus **
 
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