Heavy Turban Shell (Turbo torquata)
© John Turnbull
Operculum - Turbo torquatus #marineexplorer
Marine snails have a hard "trapdoor" (operculum) which they pull closed when they retract into their shell. This provides protection from predators if the snail is dislodged. In this shot you can see the black animal just behind the white operculum.
Photo taken on 13 Jan 2016
Usage licence:
Attribution-NonCommercial-ShareAlike License