Intertidal Invertebrates of the Central California Coast

abdomen Acmaea algae amphipods anal animals Annelida antennule aperture appendages Arthropoda ascidians Balanus barnacles basal beach body branched branchiae brown bryozoans burrowing California californiensis carapace chelae Chelifores chitons cirri clam coast colony color commensal common conspicuous crabs ctenidia dark distal dorsal elongate Elytra encrusting fauna flagellum flats flattened fresh-water genera gnathopod grooves habitats Hartman hydranth hydroids Idothea intertidal invertebrates isopods larvae lateral Laub legs lobes longitudinal male mantle margin maxilliped median medusae Mollusca Monterey Obelia operculum pair palp palpi parapodia phoronids phylum plates pleopods polychaetes posterior present proboscis prostomium radial region ribs ridges rocks rostrum rows sand second antenna segments sessile setae shell side siphons slender smooth species specimens spicules spines sponges Stimpson Suborder substrate surface telson tentacles tentacular thoracic tidal tide pools tooth tubercles tubes Uropods usually valves ventral whorl zoöecia zoöids