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Data last updated
Mon 1 Dec 2025

Bivalvia | Unionoida | Unionoidea | Unionidae | Gonideinae | Contradentini

genus Trapezoideus Simpson, 1900: cladomics

5 Recent valid species (5 total species)

Cladomics pages are experimental — even more so than the rest of this site!

The purpose of the cladomics pages for each genus and family-group level taxon is to provide statistics and references indicating the extent to which published phylogenetic work supports the classification used here.

The Cladomics Summary provides an overview of the number of studies that have included terminal species representing this taxon as well as an indication of how frequently it has been recovered as monophyletic.

Following the summary, the available published clades representing the taxon are listed.

For more information, visit the Cladomics FARQ (frequently asked rhetorical questions) page. Abbreviations for the various statistics are explained on the FARQ!

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 of Trapezoideus cladogram distances
PCoA Ordination

NJ Tree of Trapezoideus cladogram distances
NJ Tree

Cladograms

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

** Top Monophyly Cladogram **

iTtTbiriSoTroTroSiD
5 5 3 5 77 14 3 0 
              +-- 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
2 2 0 2 27 13 4 -- 
     +----- Physunio               
  +--+                             
  |  |  +-- Trapezoideus_subviridis **
  |  +--+                          
--+     +-- Trapezoideus_foliaceus ** 
  |                                
  |  +----- Yaukthwa               
  +--+                             
     |  +-- Solenaia               
     +--+                          
        +-- Lens

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

iTtTbiriSoTroTroSiD
3 3 1 3 12 12 2 4 
  +----------- Yaukthwa               
--+                                   
  |  +-------- Physunio               
  +--+                                
     |  +----- Trapezoideus_foliaceus ** 
     +--+                             
        |  +-- Trapezoideus_lenya **     
        +--+                          
           +-- Trapezoideus_mitanensis **

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

iTtTbiriSoTroTroSiD
3 3 1 3 5 5 2 4 
  +----------- Yaukthwa               
--+                                   
  |  +-------- Physunio               
  +--+                                
     |  +----- Trapezoideus_foliaceus ** 
     +--+                             
        |  +-- Trapezoideus_lenya **     
        +--+                          
           +-- Trapezoideus_subviridis **

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

iTtTbiriSoTroTroSiD
3 3 1 3 46 9 1 2 
  +-------- Yaukthwa               
--+                                
  |  +----- Trapezoideus_mitanensis **
  +--+                             
     |  +-- Trapezoideus_foliaceus ** 
     +--+                          
        +-- Trapezoideus_lenya **

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

iTtTbiriSoTroTroSiD
2 2 0 2 110 21 3 -- 
  +-------- Physunio              
  |                               
--+     +-- Trapezoideus_lenya **    
  |  +--+                         
  |  |  +-- Trapezoideus_foliaceus **
  +--+                            
     |  +-- Lens                  
     +--+                         
        +-- Yaukthwa

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

iTtTbiriSoTroTroSiD
2 2 0 2 116 21 3 -- 
        +-- Yaukthwa              
  +-----+                         
  |     +-- Lens                  
--+                               
  |  +----- Physunio              
  +--+                            
     |  +-- Trapezoideus_lenya **    
     +--+                         
        +-- Trapezoideus_foliaceus **

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

iTtTbiriSoTroTroSiD
1 1 0 1 57 2 2 -- 
  +----- Physunio              
--+                            
  |  +-- Lens                  
  +--+                         
     +-- Trapezoideus_foliaceus **

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

iTtTbiriSoTroTroSiD
1 1 0 1 37 6 3 -- 
     +-- Physunio              
  +--+                         
  |  +-- Trapezoideus_foliaceus **
--+                            
  |  +-- Lens                  
  +--+                         
     +-- Yaukthwa

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

iTtTbiriSoTroTroSiD
1 1 0 1 75 2 2 -- 
  +----- Lens                  
--+                            
  |  +-- Trapezoideus_foliaceus **
  +--+                         
     +-- Physunio

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

iTtTbiriSoTroTroSiD
1 1 0 1 36 6 3 -- 
     +-- Physunio              
  +--+                         
  |  +-- Trapezoideus_foliaceus **
--+                            
  |  +-- Lens                  
  +--+                         
     +-- Yaukthwa

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

iTtTbiriSoTroTroSiD
1 1 0 1 31 6 3 -- 
  +-------- Physunio              
--+                               
  |  +----- Trapezoideus_foliaceus **
  +--+                            
     |  +-- Lens                  
     +--+                         
        +-- Yaukthwa

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

iTtTbiriSoTroTroSiD
1 1 0 1 35 2 2 -- 
  +----- Lens                  
--+                            
  |  +-- Trapezoideus_foliaceus **
  +--+                         
     +-- Physunio

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

iTtTbiriSoTroTroSiD
1 1 0 1 36 6 3 -- 
     +-- Physunio              
  +--+                         
  |  +-- Trapezoideus_foliaceus **
--+                            
  |  +-- Lens                  
  +--+                         
     +-- Yaukthwa

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

iTtTbiriSoTroTroSiD
1 1 0 1 51 15 3 -- 
  +-------- Yaukthwa              
--+                               
  |  +----- Physunio              
  +--+                            
     |  +-- Trapezoideus_foliaceus **
     +--+                         
        +-- Lens

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

iTtTbiriSoTroTroSiD
1 1 0 1 6 3 2 -- 
  +-- Physunio    
  |               
--+-- Trapezoideus **
  |               
  +-- Lens

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

iTtTbiriSoTroTroSiD
1 1 0 1 36 6 3 -- 
  +----------- Yaukthwa_elongatula   
  |                                  
--+  +-------- Trapezoideus_foliaceus **
  |  |                               
  +--+     +-- Physunio              
     |  +--+                         
     |  |  +-- Yaukthwa_inlenensis   
     +--+                            
        |  +-- Yaukthwa_paiensis     
        +--+                         
           +-- Lens

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

iTtTbiriSoTroTroSiD
1 1 0 1 45 7 3 -- 
     +-- Physunio              
  +--+                         
  |  +-- Trapezoideus_foliaceus **
--+                            
  |  +-- Yaukthwa              
  +--+                         
     +-- Lens

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

iTtTbiriSoTroTroSiD
1 1 0 1 36 6 3 -- 
  +-- Physunio              
  |                         
  +-- Yaukthwa_paiensis     
  |                         
  +-- Yaukthwa_inlenensis   
--+                         
  +-- Trapezoideus_foliaceus **
  |                         
  +-- Yaukthwa_elongatula   
  |                         
  +-- Lens

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

iTtTbiriSoTroTroSiD
1 1 0 1 36 6 3 -- 
     +-- Physunio              
  +--+                         
  |  +-- Trapezoideus_foliaceus **
--+                            
  |  +-- Lens                  
  +--+                         
     +-- Yaukthwa

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

iTtTbiriSoTroTroSiD
1 1 0 1 56 4 4 -- 
        +-- Trapezoideus_foliaceus **
  +-----+                         
  |     +-- Physunio              
--+                               
  |  +----- Yaukthwa              
  +--+                            
     |  +-- Lens                  
     +--+                         
        +-- Solenaia

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

iTtTbiriSoTroTroSiD
1 1 0 1 20 9 3 -- 
     +-- Trapezoideus_foliaceus **
  +--+                         
  |  +-- Physunio              
--+                            
  |  +-- Yaukthwa              
  +--+                         
     +-- Lens

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

iTtTbiriSoTroTroSiD
1 1 0 1 30 13 3 -- 
  +-------- Physunio              
--+                               
  |  +----- Yaukthwa              
  +--+                            
     |  +-- Trapezoideus_foliaceus **
     +--+                         
        +-- Lens

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

iTtTbiriSoTroTroSiD
1 1 0 1 75 2 2 -- 
  +----- Lens                  
--+                            
  |  +-- Trapezoideus_foliaceus **
  +--+                         
     +-- Physunio

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

iTtTbiriSoTroTroSiD
1 1 0 1 33 18 3 -- 
  +-------- Yaukthwa              
--+                               
  |  +----- Lens                  
  +--+                            
     |  +-- Trapezoideus_foliaceus **
     +--+                         
        +-- Physunio

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

iTtTbiriSoTroTroSiD
1 1 0 1 35 2 2 -- 
  +----- Lens                  
--+                            
  |  +-- Trapezoideus_foliaceus **
  +--+                         
     +-- Physunio

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

iTtTbiriSoTroTroSiD
1 1 0 1 56 4 4 -- 
        +-- Trapezoideus_foliaceus **
  +-----+                         
  |     +-- Physunio              
--+                               
  |  +----- Yaukthwa              
  +--+                            
     |  +-- Lens                  
     +--+                         
        +-- Solenaia
 
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