These California Mussels were visible this afternoon during a very low tide. I was surprised to find only one or two per rock, and all about 4-5" long.
White siphons to the right of the chiton!
shell thin and shiny. blue-black. in dense colonies.
Cyrtopleura costata (I think) - angel wing
Bivalvia is a class of marine and freshwater molluscs with laterally compressed bodies enclosed by a shell in two hinged parts. Bivalves include clams, oysters, mussels, scallops, and numerous other families of shells. The majority are filter feeders and have no head or radula. The gills have evolved into ctenidia, specialised organs for feeding and breathing. Most bivalves bury themselves in sediment on the seabed, where they are safe from predation. Others lie on the sea...