Ash-black Slug 
Asian Clam 
Asian trampsnail 
Ass's-ear abalone 
Asteronotus cespitosus 
Asteronotus mimeticus 
Atagema intecta 
Atagema spongiosa 
Atlantic bay scallop 
Atlantic Black Seahare 
Atlantic calico scallop 
Atlantic jackknife clam 
Atlantic Rangia 
Atlantic surf clam 
Atopos rugosus 
Australian Giant Cuttlefish 
Australian Pheasant 
Baeolidia moebii 
Baiaplecta lowi 
Balkan Threeband Slug 
Banded bonnet 
Banded Periwinkle 
Banded piglet squid 
Barnacle-eating Dorid