Blue crab may refer to: Blue Crab 11, an American sailboat design Callinectes sapidus – Chesapeake or Atlantic blue crab of the West Atlantic, introduced elsewhere Cardisoma guanhumi – blue land crab of the West Atlantic Tuerkayana celeste – Christmas Island blue crab Paralithodes platypus – blue king crab of the North Pacific Portunus pelagicus – blue swimmer crab of Australia and Southwest Pacific Portunus segnis - a Western Indian Ocean species, was recently recorded in Tunisian waters, where it is invasive Portunus trituberculatus – Japanese blue crab of the Northwest Pacific