Bivalvia | Unionida | Unionoidea | Unionidae | Parreysiinae | Lamellidentini

genus Trapezidens Bolotov, Vikhrev & Konopleva in Bolotov et al., 2017: cladomics

6 Recent valid species (6 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 = 6 (6 total)
analyzed in 43 cladograms in 25 publications
maximum number of terminals in an analysis = 6 (mean = 3.05, median = 2)

Basic Monophyly

number of cladograms that test basic monophyly (i.e., more than 1 included species) = 26
maximum number of included terminals = 6, (mean = 4.38 median = 5)
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 Trapezidens cladogram distances
PCoA Ordination

NJ Tree of Trapezidens cladogram distances
NJ Tree

Cladograms

Bolotov et al., 2024 [Publ 4369], fig. 2

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

cstiTtTbiriSoTroTroSiD
1.000 6 6 4 6 56 11 2 ** 
  +-------------------- Lamellidens                
--+                                                
  |  +----------------- Balwantia                  
  +--+                                             
     |  +-------------- Trapezidens_mogaungensis **   
     +--+                                          
        |  +----------- Trapezidens_exolescens **     
        +--+                                       
           |  +-------- Trapezidens_scutum **         
           +--+                                    
              |  +----- Trapezidens_yeti **           
              +--+                                 
                 |  +-- Trapezidens_angustior **      
                 +--+                              
                    +-- Trapezidens_dolichorhynchus **

Bolotov et al., 2024 [Publ 4369], fig. S1

cstiTtTbiriSoTroTroSiD
1.000 6 6 4 6 57 11 2 0.0 
  +-------------------- Lamellidens                
--+                                                
  |  +----------------- Balwantia                  
  +--+                                             
     |  +-------------- Trapezidens_mogaungensis **   
     +--+                                          
        |  +----------- Trapezidens_exolescens **     
        +--+                                       
           |  +-------- Trapezidens_scutum **         
           +--+                                    
              |  +----- Trapezidens_yeti **           
              +--+                                 
                 |  +-- Trapezidens_dolichorhynchus **
                 +--+                              
                    +-- Trapezidens_angustior **

Campbell & Lydeard, 2026 [Publ 4810], fig. 6-14

cstiTtTbiriSoTroTroSiD
0.750 6 6 4 6 627 11 2 0 
  +----------------- Balwantia                  
--+                                             
  |  +-------------- Trapezidens_mogaungensis **   
  +--+                                          
     |  +----------- Trapezidens_exolescens **     
     +--+                                       
        |  +-------- Trapezidens_scutum **         
        +--+                                    
           |  +----- Trapezidens_yeti **           
           +--+                                 
              |  +-- Trapezidens_angustior **      
              +--+                              
                 +-- Trapezidens_dolichorhynchus **

Konopleva et al., 2026 [Publ 4847], fig. 2

cstiTtTbiriSoTroTroSiD
1.000 6 6 4 6 60 12 2 2.0 
  +----------------- Lamellidens                
  |                                             
--+  +-------------- Balwantia                  
  |  |                                          
  +--+  +----------- Trapezidens_mogaungensis **   
     |  |                                       
     +--+        +-- Trapezidens_exolescens **     
        |  +-----+                              
        |  |     +-- Trapezidens_scutum **         
        +--+                                    
           |  +----- Trapezidens_yeti **           
           +--+                                 
              |  +-- Trapezidens_angustior **      
              +--+                              
                 +-- Trapezidens_dolichorhynchus **

Konopleva et al., 2026 [Publ 4847], fig. S1

cstiTtTbiriSoTroTroSiD
1.000 6 6 3 6 60 12 2 1.0 
  +----------------- Lamellidens                
  |                                             
--+  +-------------- Balwantia                  
  |  |                                          
  +--+  +----------- Trapezidens_mogaungensis **   
     |  |                                       
     +--+  +-------- Trapezidens_exolescens **     
        |  |                                    
        +--+  +----- Trapezidens_scutum **         
           |  |                                 
           +--+  +-- Trapezidens_angustior **      
              |  |                              
              +--+-- Trapezidens_dolichorhynchus **
                 |                              
                 +-- Trapezidens_yeti **

Konopleva et al., 2026 [Publ 4847], fig. S2

cstiTtTbiriSoTroTroSiD
1.000 6 6 4 6 61 12 2 0 
  +-------------------- Lamellidens                
--+                                                
  |  +----------------- Balwantia                  
  +--+                                             
     |  +-------------- Trapezidens_mogaungensis **   
     +--+                                          
        |  +----------- Trapezidens_exolescens **     
        +--+                                       
           |  +-------- Trapezidens_scutum **         
           +--+                                    
              |  +----- Trapezidens_yeti **           
              +--+                                 
                 |  +-- Trapezidens_angustior **      
                 +--+                              
                    +-- Trapezidens_dolichorhynchus **

Konopleva et al., 2026 [Publ 4847], fig. S3

cstiTtTbiriSoTroTroSiD
1.000 6 6 4 6 61 12 2 0 
  +-------------------- Lamellidens                
--+                                                
  |  +----------------- Balwantia                  
  +--+                                             
     |  +-------------- Trapezidens_mogaungensis **   
     +--+                                          
        |  +----------- Trapezidens_exolescens **     
        +--+                                       
           |  +-------- Trapezidens_scutum **         
           +--+                                    
              |  +----- Trapezidens_yeti **           
              +--+                                 
                 |  +-- Trapezidens_angustior **      
                 +--+                              
                    +-- Trapezidens_dolichorhynchus **

Bolotov et al., 2022 [Publ 4252], fig. 2

cstiTtTbiriSoTroTroSiD
1.000 6 6 3 6 55 10 1 1.0 
  +-------------- Lamellidens                
  |                                          
--+  +----------- Trapezidens_mogaungensis **   
  |  |                                       
  +--+  +-------- Trapezidens_exolescens **     
     |  |                                    
     +--+  +----- Trapezidens_scutum **         
        |  |                                 
        +--+  +-- Trapezidens_angustior **      
           |  |                              
           +--+-- Trapezidens_dolichorhynchus **
              |                              
              +-- Trapezidens_yeti **

Bolotov et al., 2022 [Publ 4252], fig. S1

cstiTtTbiriSoTroTroSiD
1.000 6 6 4 6 55 10 1 2.0 
  +----------------- Lamellidens                
--+                                             
  |  +-------------- Trapezidens_mogaungensis **   
  +--+                                          
     |  +----------- Trapezidens_scutum **         
     +--+                                       
        |  +-------- Trapezidens_exolescens **     
        +--+                                    
           |  +----- Trapezidens_yeti **           
           +--+                                 
              |  +-- Trapezidens_dolichorhynchus **
              +--+                              
                 +-- Trapezidens_angustior **

Konopleva et al., 2020 [Publ 4072], fig. 2

cstiTtTbiriSoTroTroSiD
1.000 5 5 3 5 7 4 1 3.0 
  +-------------- Lamellidens                
--+                                          
  |  +----------- Trapezidens_scutum **         
  +--+                                       
     |  +-------- Trapezidens_exolescens **     
     +--+                                    
        |  +----- Trapezidens_yeti **           
        +--+                                 
           |  +-- Trapezidens_angustior **      
           +--+                              
              +-- Trapezidens_dolichorhynchus **

Bolotov et al., 2022 [Publ 4239], fig. 2

cstiTtTbiriSoTroTroSiD
1.000 5 5 3 5 53 9 1 5.0 
  +----------- Lamellidens                
  |                                       
--+        +-- Trapezidens_exolescens **     
  |  +-----+                              
  |  |     +-- Trapezidens_scutum **         
  +--+                                    
     |  +----- Trapezidens_angustior **      
     +--+                                 
        |  +-- Trapezidens_dolichorhynchus **
        +--+                              
           +-- Trapezidens_yeti **

Bolotov et al., 2022 [Publ 4239], fig. S1

cstiTtTbiriSoTroTroSiD
1.000 5 5 2 5 53 9 1 2.0 
  +----------- Lamellidens                
  |                                       
--+  +-------- Trapezidens_exolescens **     
  |  |                                    
  +--+  +----- Trapezidens_scutum **         
     |  |                                 
     +--+  +-- Trapezidens_angustior **      
        |  |                              
        +--+-- Trapezidens_dolichorhynchus **
           |                              
           +-- Trapezidens_yeti **

Bolotov et al., 2022 [Publ 4239], fig. S2

cstiTtTbiriSoTroTroSiD
1.000 5 5 3 5 53 9 1 3.0 
  +-------------- Lamellidens                
--+                                          
  |  +----------- Trapezidens_scutum **         
  +--+                                       
     |  +-------- Trapezidens_exolescens **     
     +--+                                    
        |  +----- Trapezidens_yeti **           
        +--+                                 
           |  +-- Trapezidens_dolichorhynchus **
           +--+                              
              +-- Trapezidens_angustior **

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

cstiTtTbiriSoTroTroSiD
1.000 5 5 3 5 44 4 1 1.0 
  +-------------- Lamellidens                
--+                                          
  |  +----------- Trapezidens_exolescens **     
  +--+                                       
     |  +-------- Trapezidens_scutum **         
     +--+                                    
        |  +----- Trapezidens_yeti **           
        +--+                                 
           |  +-- Trapezidens_angustior **      
           +--+                              
              +-- Trapezidens_dolichorhynchus **

Bolotov et al., 2022 [Publ 4250], fig. S4

cstiTtTbiriSoTroTroSiD
1.000 5 5 2 5 4 4 1 4.0 
  +----------- Lamellidens                
  |                                       
--+  +-------- Trapezidens_scutum **         
  |  |                                    
  +--+  +----- Trapezidens_exolescens **     
     |  |                                 
     +--+  +-- Trapezidens_dolichorhynchus **
        |  |                              
        +--+-- Trapezidens_angustior **      
           |                              
           +-- Trapezidens_yeti **

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

cstiTtTbiriSoTroTroSiD
1.000 4 4 2 4 113 4 1 2.0 
  +----------- Lamellidens                
--+                                       
  |  +-------- Trapezidens_exolescens **     
  +--+                                    
     |  +----- Trapezidens_scutum **         
     +--+                                 
        |  +-- Trapezidens_dolichorhynchus **
        +--+                              
           +-- Trapezidens_angustior **

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

cstiTtTbiriSoTroTroSiD
1.000 4 4 2 4 107 4 1 2.0 
  +----------- Lamellidens                
--+                                       
  |  +-------- Trapezidens_exolescens **     
  +--+                                    
     |  +----- Trapezidens_scutum **         
     +--+                                 
        |  +-- Trapezidens_dolichorhynchus **
        +--+                              
           +-- Trapezidens_angustior **

Bolotov et al., 2017 [Publ 3764], fig. S1

cstiTtTbiriSoTroTroSiD
0.333 3 3 1 3 122 8 1 3.0 
  +-------- Lamellidens                
--+                                    
  |  +----- Trapezidens_exolescens **     
  +--+                                 
     |  +-- Trapezidens_dolichorhynchus **
     +--+                              
        +-- Trapezidens_angustior **

Huang et al., 2019 [Publ 3843], fig. 2

cstiTtTbiriSoTroTroSiD
1.000 3 3 1 3 198 8 1 3.0 
  +-------- Lamellidens                
--+                                    
  |  +----- Trapezidens_exolescens **     
  +--+                                 
     |  +-- Trapezidens_dolichorhynchus **
     +--+                              
        +-- Trapezidens_angustior **

Huang et al., 2019 [Publ 3843], fig. S3

cstiTtTbiriSoTroTroSiD
1.000 3 3 1 3 196 8 1 3.0 
  +-------- Lamellidens                
--+                                    
  |  +----- Trapezidens_exolescens **     
  +--+                                 
     |  +-- Trapezidens_angustior **      
     +--+                              
        +-- Trapezidens_dolichorhynchus **

Huang et al., 2019 [Publ 3843], fig. S4

cstiTtTbiriSoTroTroSiD
1.000 3 3 1 3 198 8 1 3.0 
  +-------- Lamellidens                
--+                                    
  |  +----- Trapezidens_exolescens **     
  +--+                                 
     |  +-- Trapezidens_angustior **      
     +--+                              
        +-- Trapezidens_dolichorhynchus **

Bolotov et al., 2017 [Publ 3761], fig. S1

cstiTtTbiriSoTroTroSiD
1.000 2 2 0 2 137 6 1 -- 
  +----- Lamellidens                
--+                                 
  |  +-- Trapezidens_dolichorhynchus **
  +--+                              
     +-- Trapezidens_exolescens **

Bolotov et al., 2017 [Publ 3761], fig. S2

cstiTtTbiriSoTroTroSiD
1.000 2 2 0 2 137 6 1 -- 
  +----- Lamellidens                
--+                                 
  |  +-- Trapezidens_dolichorhynchus **
  +--+                              
     +-- Trapezidens_exolescens **

Konopleva et al., 2017 [Publ 3807], fig. 5

cstiTtTbiriSoTroTroSiD
1.000 2 2 0 2 3 3 1 -- 
  +----- Lamellidens                
--+                                 
  |  +-- Trapezidens_exolescens **     
  +--+                              
     +-- Trapezidens_dolichorhynchus **

Konopleva et al., 2017 [Publ 3807], fig. 6

cstiTtTbiriSoTroTroSiD
1.000 2 2 0 2 29 3 1 -- 
  +----- Lamellidens                
--+                                 
  |  +-- Trapezidens_exolescens **     
  +--+                              
     +-- Trapezidens_dolichorhynchus **

Bolotov et al., 2018 [Publ 3826], fig. 2

cstiTtTbiriSoTroTroSiD
1.000 2 2 0 2 80 4 1 -- 
  +----- Lamellidens                
--+                                 
  |  +-- Trapezidens_exolescens **     
  +--+                              
     +-- Trapezidens_dolichorhynchus **

Whelan et al., 2011 [Publ 3380], fig. 1-ML

cstiTtTbiriSoTroTroSiD
1.000 1 1 0 1 35 1 1 -- 
  +-- Lamellidens                
--+                              
  +-- Trapezidens_dolichorhynchus **

Whelan et al., 2011 [Publ 3380], fig. 1-MP

cstiTtTbiriSoTroTroSiD
1.000 1 1 0 1 35 1 1 -- 
  +-- Lamellidens                
--+                              
  +-- Trapezidens_dolichorhynchus **

Pfeiffer & Graf, 2015 [Publ 3620], fig. 2

cstiTtTbiriSoTroTroSiD
1.000 1 1 0 1 39 1 1 -- 
  +-- Trapezidens_dolichorhynchus **
--+                              
  +-- Lamellidens

Pfeiffer et al., 2018 [Publ 3827], fig. 2

cstiTtTbiriSoTroTroSiD
1.000 1 1 0 1 27 1 1 -- 
  +-- Trapezidens_dolichorhynchus **
--+                              
  +-- Lamellidens

Jeratthitikul et al., 2019 [Publ 3922], fig. 1

cstiTtTbiriSoTroTroSiD
1.000 1 1 0 1 22 1 1 -- 
  +-- Lamellidens           
--+                         
  +-- Trapezidens_exolescens **

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

cstiTtTbiriSoTroTroSiD
1.000 1 1 0 1 56 1 1 -- 
  +-- Trapezidens_dolichorhynchus **
--+                              
  +-- Lamellidens

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

cstiTtTbiriSoTroTroSiD
1.000 1 1 0 1 56 1 1 -- 
  +-- Trapezidens_dolichorhynchus **
--+                              
  +-- Lamellidens

Wu et al., 2021 [Publ 4366], fig. 2_I

cstiTtTbiriSoTroTroSiD
1.000 1 1 0 1 90 3 1 -- 
  +-- Trapezidens_exolescens **
--+                         
  +-- Lamellidens

Wu et al., 2021 [Publ 4366], fig. 6

cstiTtTbiriSoTroTroSiD
1.000 1 1 0 1 90 3 1 -- 
  +-- Trapezidens_exolescens **
--+                         
  +-- Lamellidens

Konopleva et al., 2023 [Publ 4269], fig. S1_4

cstiTtTbiriSoTroTroSiD
1.000 1 1 0 1 55 1 1 -- 
  +-- Trapezidens_exolescens **
--+                         
  +-- Lamellidens

Chen et al., 2026 [Publ 4833], fig. 1

cstiTtTbiriSoTroTroSiD
0.667 1 1 0 1 26 1 1 -- 
  +----------------------------- Trapezidens_dolichorhynchus **
  |                                                         
--+  +-------------------------- Parreysia                  
  |  |                                                      
  +--+  +----------------------- Leoparreysia               
     |  |                                                   
     |  |                 +----- Nitia                      
     +--+  +--------------+                                 
        |  |              |  +-- Coelatura                  
        |  |              +--+                              
        |  |                 +-- Prisodontopsis             
        +--+                                                
           |                 +-- Indochinella               
           |  +--------------+                              
           |  |              +-- Indonaia                   
           +--+                                             
              |  +-------------- Radiatula                  
              |  |                                          
              +--+  +----------- Songkhlanaia               
                 |  |                                       
                 +--+  +-------- Harmandia                  
                    |  |                                    
                    +--+     +-- Chenunionetta              
                       |  +--+                              
                       |  |  +-- Unionetta_fabagina__2      
                       +--+                                 
                          |  +-- Unionetta_fabagina__1      
                          +--+                              
                             +-- Scabies

Lopes-Lima et al., 2017 [Publ 3745], fig. 1-2

cstiTtTbiriSoTroTroSiD
1.000 1 1 0 1 80 0 0 -- 
  +-------- Trapezidens_dolichorhynchus **
--+                                    
  |  +----- Leoparreysia               
  +--+                                 
     |  +-- Coelatura                  
     +--+                              
        +-- Indochinella

Dai et al., 2024 [Publ 4385], fig. 3-BI

cstiTtTbiriSoTroTroSiD
1.000 1 1 0 1 30 0 0 -- 
  +-- Trapezidens_exolescens **
--+                         
  +-- Scabies

Dai et al., 2024 [Publ 4385], fig. 3-ML

cstiTtTbiriSoTroTroSiD
1.000 1 1 0 1 30 0 0 -- 
  +-- Trapezidens_exolescens **
--+                         
  +-- Scabies

Dai et al., 2024 [Publ 4386], fig. 5-BI

cstiTtTbiriSoTroTroSiD
1.000 1 1 0 1 21 0 0 -- 
  +-- Trapezidens_exolescens **
--+                         
  +-- Scabies

Dai et al., 2024 [Publ 4386], fig. 5-ML

cstiTtTbiriSoTroTroSiD
1.000 1 1 0 1 21 0 0 -- 
  +-- Trapezidens_exolescens **
--+                         
  +-- Scabies

Dai et al., 2026 [Publ 4757], fig. 3

cstiTtTbiriSoTroTroSiD
1.000 1 1 0 1 33 0 0 -- 
  +-- Scabies               
--+                         
  +-- Trapezidens_exolescens **