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Data last updated
Mon 1 Dec 2025

Bivalvia | Unionoida | Unionoidea | Unionidae | Ambleminae | Lampsilini

genus Pachynaias Crosse & Fischer, 1894: cladomics

1 Recent valid species (1 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 = 1 (1 total)
analyzed in 8 cladograms in 5 publications
maximum number of terminals in an analysis = 1 (mean = 1, median = 1)


Cladograms

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

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

iTtTbiriSoTroTroSiD
1 1 0 1 30 11 11 --
                       +-- Cyrtonaias            
  +--------------------+                         
  |                    +-- Glebula               
--+                                              
  |  +-------------------- Potamilus             
  |  |                                           
  +--+                 +-- Truncilla             
     |  +--------------+                         
     |  |              +-- Ptychobranchus        
     +--+                                        
        |  +-------------- Pachynaias_spheniopsis **
        |  |                                     
        +--+  +----------- Mesonaias             
           |  |                                  
           +--+        +-- Lampsilis             
              |  +-----+                         
              |  |     +-- Ortmanniana           
              +--+                               
                 |  +----- Cambarunio            
                 +--+                            
                    |  +-- Epioblasma            
                    +--+                         
                       +-- Ligumia               

Smith et al., 2020 [Publ 4129], fig. 2-3

iTtTbiriSoTroTroSiD
1 1 0 1 27 19 7 --
  +-------------- Obliquaria            
  |                                     
--+  +----------- Cyrtonaias            
  |  |                                  
  |  |        +-- Pachynaias_spheniopsis **
  +--+  +-----+                         
     |  |     +-- Lampsilis             
     |  |                               
     +--+     +-- Ellipsaria            
        |  +--+                         
        |  |  +-- Truncilla             
        +--+                            
           |  +-- Atlanticoncha         
           +--+                         
              +-- Potamilus             

Smith et al., 2020 [Publ 4129], fig. 1

iTtTbiriSoTroTroSiD
1 1 0 1 27 19 7 --
  +-------------- Obliquaria            
  |                                     
--+  +----------- Cyrtonaias            
  |  |                                  
  |  |        +-- Pachynaias_spheniopsis **
  +--+  +-----+                         
     |  |     +-- Lampsilis             
     |  |                               
     +--+     +-- Ellipsaria            
        |  +--+                         
        |  |  +-- Truncilla             
        +--+                            
           |  +-- Atlanticoncha         
           +--+                         
              +-- Potamilus             

Freeman et al., 2025 [Publ 4443], fig. 2

iTtTbiriSoTroTroSiD
1 1 0 1 5 1 1 --
  +-- Mesonaias             
--+                         
  +-- Pachynaias_spheniopsis **

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

iTtTbiriSoTroTroSiD
1 1 0 1 56 4 4 --
  +----------- Obliquaria            
--+                                  
  |  +-------- Cyrtonaias            
  +--+                               
     |  +----- Leaunio               
     +--+                            
        |  +-- Lampsilis             
        +--+                         
           +-- Pachynaias_spheniopsis **

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

iTtTbiriSoTroTroSiD
1 1 0 1 21 10 10 --
  +----------------------- Cyrtonaias            
  |                                              
--+  +-------------------- Ptychobranchus        
  |  |                                           
  +--+  +----------------- Ligumia               
     |  |                                        
     +--+  +-------------- Potamilus             
        |  |                                     
        +--+  +----------- Pachynaias_spheniopsis **
           |  |                                  
           |  |        +-- Epioblasma            
           +--+  +-----+                         
              |  |     +-- Truncilla             
              |  |                               
              +--+     +-- Mesonaias             
                 |  +--+                         
                 |  |  +-- Cambarunio            
                 +--+                            
                    |  +-- Ortmanniana           
                    +--+                         
                       +-- Lampsilis             

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

iTtTbiriSoTroTroSiD
1 1 0 1 22 11 11 --
           +-- Glebula               
  +--------+                         
  |        +-- Cyrtonaias            
  |                                  
--+  +-------- Potamilus             
  |  |                               
  |  |     +-- Ptychobranchus        
  +--+  +--+                         
     |  |  +-- Truncilla             
     |  |                            
     |  |  +-- Ortmanniana           
     +--+  |                         
        |  +-- Epioblasma            
        |  |                         
        |  +-- Lampsilis             
        |  |                         
        +--+-- Ligumia               
           |                         
           +-- Cambarunio            
           |                         
           +-- Pachynaias_spheniopsis **
           |                         
           +-- Mesonaias             

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

iTtTbiriSoTroTroSiD
1 1 0 1 56 4 4 --
  +----------- Obliquaria            
--+                                  
  |  +-------- Cyrtonaias            
  +--+                               
     |  +----- Leaunio               
     +--+                            
        |  +-- Lampsilis             
        +--+                         
           +-- Pachynaias_spheniopsis **
 
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