| Atollidae () | 
	
		
	
	| 15 cm WD (male/unsexed) | 
| pelagic; marine; depth range 0 - 1500 m | 
	
	
	
		| Indo-Pacific, Atlantic Ocean and the Antarctic.  Tropical to polar. | 
	
		
	| Up to 15 cm wide; basal attachment of stomach clover-shaped; with up to 32, usually about 22, tentacles; marginal septa diverging at their proximal ends, not completely covered by coronal muscle. | 
	
	
		| Largest and best known of the Atolla species.  Minimum depth from Ref. 116114. Inhabits offshore (Ref. 813).  Found in deep waters (Ref. 2376). | 
	
	
    | Not Evaluated (N.E.) Ref. 123251) | 
  
  
 		
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