Amano Snails!

I am beginning to think Takashi Amano thrills to make me crazy. In his 
first book he had shrimp all over his tanks (Yamato Numaebi). In his two 
latest books, he has snails all over the place. The only snails I have 
felt safe keeping are Malaysian Trumpets. Clearly, Amano has a better 
idea. Does anyone have a guess as to what the snails in the tanks 
pictured in his latest books are? Makes me nuts!
Justin Healy in sunny, dry, cool Savannah