Giant Clam

This clam is a summon of the Second Mizukage; he would later use this summon in the Fourth Shinobi World War.

Trivia

 * Although simply called 'giant clam', the kanji is actually the name for a mythical giant clam and usually pronounced as 'shin' in Japanese ('shèn' or 'chèn' in Chinese). This shin is actually a kind of aquatic, shape-shifting dragon in the form a giant clam. It is said to be able to cause mirages and Fata Morganas. In fact, its name has become almost synonymous with 'mirage': in Japanese, the word for 'mirage' is.