Plesiosaur

The sea monster that did Ganzacks bidding. Sea monster was a massive pleasiosaur. The monster wore a helmet on its head. Upon first encountering the beast it kidnaped Nami despite Luffy's attempt toeat it. Latter it assisted Ganzack in his battle aginst Luffy. The monster was finaly defeated by the islanders who hurled dynamite at it sinking Ganzacks ship in the process.