 Fish of the genus "Cyclicthys" have three-rooted, rigid spines (actually modified scales) distributed over their bodies, and beak-like jaws, used to crush their hard-shelled prey (crustaceans and molluscs).They differ from the porcupinefishes of the genus "Diodon", which have moveable spines.Like Tetraodontidae (blowfish) they have the ability to inflate themselves.