Length 26 mm. Llŷn, North Wales. March 2016.
Mantle greatly thickened where reflected around periphery to form a fleshy girdle into which ends of valves deeply embedded
If detatched from substrate, A. crinita usually curls into a defensive ball, when girdle can often be seen for 100% of chiton’s width.

KEY ID FEATURES and similar species at: 01 Acanthochitona crinita