Spider Piranha is a new boss character set to appear in Super Mario Wars and a boss in New Super Mario Sunshine. Spider Piranha can spit Spider Webs and wrap its foes in silk. It can also throw sharp thorny leaves to attack and can drain Mario's HP if Mario is hit. It also appears in Yoshi's Island D.I.Y. and Umbrella Labyrinth.
As of Umbrella Labyrinth, Spider Piranha can also use thunder breath.