exoskeleton

White clawed crayfish Austropotamobius pallipes in profile with claws lifted and antennae extended

Pen and ink illustration showing the diversity of members in the Crustacea family

Edible crab Cancer pagurus pen and ink illustration with rich watercolour top wash, cut to white, stippled, view from above

Fresh water shrimp Gammarus pulex on a sandy background showing its laterally compressed sides