  
    Fig. 23. Uca lactea lactea, a 
    common sympatric species of Uca formosensis. | 
    
      
    Fig. 24. Uca arcuata, a 
    common sympatric species of Uca formosensis. | 
  
  
    
      
    Fig. 25. Uca chlorophthalmus crassipes, 
    a common sympatric species of Uca formosensis in Penghu (Pescadores) 
    habitat. | 
    
      
    Fig. 26. Helice 
    formosensis is another crab species sympatric to Uca formosensis. | 
  
  
    
      
    Fig. 27. A typical "volcano" 
    built by the sympatric crustacean, Laomedia astacina. |