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Page last updated
Thu 17 July 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 | Unionoida | Unionoidea | Unionidae | Gonideinae | Contradentini

genus Trapezoideus Simpson, 1900: cladomics
     5 Recent valid species (5 total species)

Cladomics Summary

number of species = 5 (5 total)
analyzed in 27 cladograms in 18 publications
maximum number of terminals in an analysis = 5 (mean = 1.48, median = 1)

Basic Monophyly

number of cladograms that test basic monophyly (i.e., more than 1 included species) = 7
maximum number of included terminals = 5, (mean = 2.86 median = 3)
proportion of cladograms that support basic monophyly = 1

Pairwise Cladogram Clustering

The graphs below depict in two dimensions all pair-wise ingroup distances within the cladome. See the Cladmoics FARQ for more information.


PCoA Ordination


NJ Tree

Konopleva et al., 2023 [Publ 4262], fig. 8

** Top Monophyly Cladogram **

iTtTbiriSoTroTroSiD
5535771430
              +-- Yaukthwa                  
  +-----------+                             
  |           +-- Lens                      
--+                                         
  |  +----------- Physunio                  
  |  |                                      
  +--+        +-- Trapezoideus_thachiadensis **
     |  +-----+                             
     |  |     +-- Trapezoideus_subviridis **   
     +--+                                   
        |  +----- Trapezoideus_mitanensis **   
        +--+                                
           |  +-- Trapezoideus_foliaceus **    
           +--+                             
              +-- Trapezoideus_lenya **

Pfeiffer et al., 2021 [Publ 4126], fig. 9

** Top Sister-Group Cladogram **

iTtTbiriSoTroTroSiD
220227134--
     +----- Physunio               
  +--+                             
  |  |  +-- Trapezoideus_subviridis **
  |  +--+                          
--+     +-- Trapezoideus_foliaceus ** 
  |                                
  |  +----- Yaukthwa               
  +--+                             
     |  +-- Solenaia               
     +--+                          
        +-- Lens

Bolotov et al., 2022 [Publ 4250], fig. S5

iTtTbiriSoTroTroSiD
3313121224
  +----------- Yaukthwa               
--+                                   
  |  +-------- Physunio               
  +--+                                
     |  +----- Trapezoideus_foliaceus ** 
     +--+                             
        |  +-- Trapezoideus_lenya **     
        +--+                          
           +-- Trapezoideus_mitanensis **

Bolotov et al., 2022 [Publ 4250], fig. 8

iTtTbiriSoTroTroSiD
331346912
  +-------- Yaukthwa               
--+                                
  |  +----- Trapezoideus_mitanensis **
  +--+                             
     |  +-- Trapezoideus_foliaceus ** 
     +--+                          
        +-- Trapezoideus_lenya **

Pfeiffer et al., 2021 [Publ 4126], fig. 18

iTtTbiriSoTroTroSiD
33135524
  +----------- Yaukthwa               
--+                                   
  |  +-------- Physunio               
  +--+                                
     |  +----- Trapezoideus_foliaceus ** 
     +--+                             
        |  +-- Trapezoideus_lenya **     
        +--+                          
           +-- Trapezoideus_subviridis **

Bolotov et al., 2020 [Publ 4100], fig. S1

iTtTbiriSoTroTroSiD
2202110213--
  +-------- Physunio              
  |                               
--+     +-- Trapezoideus_lenya **    
  |  +--+                         
  |  |  +-- Trapezoideus_foliaceus **
  +--+                            
     |  +-- Lens                  
     +--+                         
        +-- Yaukthwa

Bolotov et al., 2020 [Publ 4100], fig. 1

iTtTbiriSoTroTroSiD
2202116213--
        +-- Yaukthwa              
  +-----+                         
  |     +-- Lens                  
--+                               
  |  +----- Physunio              
  +--+                            
     |  +-- Trapezoideus_lenya **    
     +--+                         
        +-- Trapezoideus_foliaceus **

Zieritz et al., 2021 [Publ 4218], fig. 5

iTtTbiriSoTroTroSiD
11013163--
  +-------- Physunio              
--+                               
  |  +----- Trapezoideus_foliaceus **
  +--+                            
     |  +-- Lens                  
     +--+                         
        +-- Yaukthwa

Pfeiffer et al., 2019 [Publ 3937], fig. 4-5

iTtTbiriSoTroTroSiD
11015644--
        +-- Trapezoideus_foliaceus **
  +-----+                         
  |     +-- Physunio              
--+                               
  |  +----- Yaukthwa              
  +--+                            
     |  +-- Lens                  
     +--+                         
        +-- Solenaia

Pfeiffer et al., 2019 [Publ 3937], fig. 6

iTtTbiriSoTroTroSiD
11015644--
        +-- Trapezoideus_foliaceus **
  +-----+                         
  |     +-- Physunio              
--+                               
  |  +----- Yaukthwa              
  +--+                            
     |  +-- Lens                  
     +--+                         
        +-- Solenaia

Jeratthitikul et al., 2024 [Publ 4387], fig. 1

iTtTbiriSoTroTroSiD
11015722--
  +----- Physunio              
--+                            
  |  +-- Lens                  
  +--+                         
     +-- Trapezoideus_foliaceus **

Liu et al., 2024 [Publ 4380], fig. 5

iTtTbiriSoTroTroSiD
11013663--
     +-- Physunio              
  +--+                         
  |  +-- Trapezoideus_foliaceus **
--+                            
  |  +-- Lens                  
  +--+                         
     +-- Yaukthwa

Konopleva et al., 2019 [Publ 4041], fig. 3

iTtTbiriSoTroTroSiD
110133183--
  +-------- Yaukthwa              
--+                               
  |  +----- Lens                  
  +--+                            
     |  +-- Trapezoideus_foliaceus **
     +--+                         
        +-- Physunio

Zieritz et al., 2020 [Publ 4102], fig. 4

iTtTbiriSoTroTroSiD
110130133--
  +-------- Physunio              
--+                               
  |  +----- Yaukthwa              
  +--+                            
     |  +-- Trapezoideus_foliaceus **
     +--+                         
        +-- Lens

Jeratthitikul et al., 2021 [Publ 4219], fig. 2

iTtTbiriSoTroTroSiD
11013522--
  +----- Lens                  
--+                            
  |  +-- Trapezoideus_foliaceus **
  +--+                         
     +-- Physunio

Jeratthitikul et al., 2021 [Publ 4212], fig. 4

iTtTbiriSoTroTroSiD
11012093--
     +-- Trapezoideus_foliaceus **
  +--+                         
  |  +-- Physunio              
--+                            
  |  +-- Yaukthwa              
  +--+                         
     +-- Lens

Wu et al., 2024 [Publ 4350], fig. 5c

iTtTbiriSoTroTroSiD
11013663--
  +-- Physunio              
  |                         
  +-- Yaukthwa_paiensis     
  |                         
  +-- Yaukthwa_inlenensis   
--+                         
  +-- Trapezoideus_foliaceus **
  |                         
  +-- Yaukthwa_elongatula   
  |                         
  +-- Lens

Jeratthitikul et al., 2021 [Publ 4219], fig. 1

iTtTbiriSoTroTroSiD
11013522--
  +----- Lens                  
--+                            
  |  +-- Trapezoideus_foliaceus **
  +--+                         
     +-- Physunio

Konopleva et al., 2019 [Publ 3900], fig. 1

iTtTbiriSoTroTroSiD
110151153--
  +-------- Yaukthwa              
--+                               
  |  +----- Physunio              
  +--+                            
     |  +-- Trapezoideus_foliaceus **
     +--+                         
        +-- Lens

Pfeiffer et al., 2018 [Publ 3827], fig. 1

iTtTbiriSoTroTroSiD
1101632--
  +-- Physunio    
  |               
--+-- Trapezoideus **
  |               
  +-- Lens

Wu et al., 2024 [Publ 4350], fig. 6-7

iTtTbiriSoTroTroSiD
11013663--
     +-- Physunio              
  +--+                         
  |  +-- Trapezoideus_foliaceus **
--+                            
  |  +-- Lens                  
  +--+                         
     +-- Yaukthwa

Wu et al., 2024 [Publ 4350], fig. 5a

iTtTbiriSoTroTroSiD
11013663--
     +-- Physunio              
  +--+                         
  |  +-- Trapezoideus_foliaceus **
--+                            
  |  +-- Lens                  
  +--+                         
     +-- Yaukthwa

Wu et al., 2024 [Publ 4388], fig. 5

iTtTbiriSoTroTroSiD
11013763--
     +-- Physunio              
  +--+                         
  |  +-- Trapezoideus_foliaceus **
--+                            
  |  +-- Lens                  
  +--+                         
     +-- Yaukthwa

Wu et al., 2024 [Publ 4350], fig. 5b

iTtTbiriSoTroTroSiD
11013663--
  +----------- Yaukthwa_elongatula   
  |                                  
--+  +-------- Trapezoideus_foliaceus **
  |  |                               
  +--+     +-- Physunio              
     |  +--+                         
     |  |  +-- Yaukthwa_inlenensis   
     +--+                            
        |  +-- Yaukthwa_paiensis     
        +--+                         
           +-- Lens

Jeratthitikul et al., 2022 [Publ 4260], fig. S1_1

iTtTbiriSoTroTroSiD
11017522--
  +----- Lens                  
--+                            
  |  +-- Trapezoideus_foliaceus **
  +--+                         
     +-- Physunio

Jeratthitikul et al., 2022 [Publ 4260], fig. S2_2

iTtTbiriSoTroTroSiD
11017522--
  +----- Lens                  
--+                            
  |  +-- Trapezoideus_foliaceus **
  +--+                         
     +-- Physunio

Zieritz et al., 2024 [Publ 4381], fig. 2

iTtTbiriSoTroTroSiD
11014573--
     +-- Physunio              
  +--+                         
  |  +-- Trapezoideus_foliaceus **
--+                            
  |  +-- Yaukthwa              
  +--+                         
     +-- Lens
 
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