mussel

Rocky shore line ecosystem zonation of species.  Some of the animals and pants featured include whelks, mussels, bladderwrack, star fish, top shells, periwinkles, crabs, branacles, and anenomes.  Illustration from The Hidden Universe: Adventures in Biodiversity by Alexandre Antonelli

Blue mussels Mytilus edulis with byssal threads on wooden piling.  Illustration includes barnacles and limpets, and some bladder wrack seaweed.  Illustration from “30 Animals that made us smarter” by Patrick Ayree (BBC Books).