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The giant African snail is classified under phylum mollusca, gastropoda class, in the order of achatinoidea. It belongs to the family of achatinidae and genus achatina. The halaan or also known as clam also belongs to the class of bivalvia or those with bivalved shell while the  tridacna is under class bivalvia, the order veneroida, and family of cardiidae. 
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