Shallow-water Commensals In shallow-water sand flats in eastern Florida, beautiful and snail-like “yoyo clams” (members of the superfamily Galeommatoidea) live commensally with mantis shrimps, meaning that the shrimp share the clams’ food without harming them. Yabbie pumps will be used at Moreton Bay to search for Australian species of this group. photo © P. Mikkelson