Paralomis histrix is a species of king crab, family Lithodidae. It lives at a depth of in Tokyo Bay, Enshunada and through to Kyūshū. It has few predators because of its size and spiky carapace.[1] It is sometimes kept in public aquariums and is occasionally referred to as the porcupine crab,[2] a name otherwise used for Neolithodes grimaldii.