Sea tombstones are the cleaning force of the oceans, feeding primarily on floating carrion. The large shelled head carapace acts as a propulsion agent. pushing water out of it and propelling the ST through the water. their flippers aid in locomotion. The only visible thing while feeding, they get their names from the carapace itself. The head being a marker of death.
the barbed tail hooks them to the carrion. Their sensitive mouth parts are protected when not feeding, the eye stalks folding over it. The toothy mouth part is capable of extending up to six feet if necessary.
i'd like to color it at some point. but for now here it is in B/W