- 
    
    
    - 
    
Eumetazoa (metazoans)- 
    
Bilateria (bilaterally symmetrical animals)- 
    
Deuterostomia (deuterostomes)- 
    
Echinodermata (sea stars, sea urchins, sea cucumbers, and relatives)- 
    
Class Ophiuroidea- 
    
Order Euryalida- 
    
Family Euryalidae- 
    
Genus Sthenocephalus- 
        
Species Sthenocephalus anopla
- 
        
Species Sthenocephalus indicus
 
- 
        
 
- 
    
 
- 
    
 
- 
    
 
- 
    
 
- 
    
 
- 
    
 
- 
    
 
- 
    
