Acanthochitona garnoti, the spiny chiton, is a medium-sized polyplacophoran mollusc in the family Acanthochitonidae,[1] found on the coast of southern Africa.

This species is conspicuous for the nine paired tufts or rosettes of long glassy spines that decorate its girdle.

The spicules are sharp, and if carelessly handled, easily penetrate the human skin, where they detach and remain, becoming painfully irritating.

It can be found on exposed rock surfaces high up in the inter-tidal zone, a location that is unusually far from the water for chitons.

Both the range and the pattern of foraging are adapted to the type of substrate, with different strategies adopted on rocky versus sandy ground.