Globefish

A plectognath fish of the genera Diodon, Tetrodon, and allied genera. The globefishes can suck in water or air and distend the body to a more or less globular form. Called also porcupine fish, and sea hedgehog. See Diodon.

any of numerous marine fishes whose elongated spiny body can inflate itself with water or air to form a globe; several species contain a potent nerve poison; closely related to spiny puffers