marine flat top shell gastropod, gibbula umbilicalis, on an alga

animal aquatic atlantic beach beauty closeup conch cone crawl creature ecology ecosystem estuarine flat flora gastropod genus gibbula habitat intertidal invertebrate life living low marin marine mudflat natural nature object ocean outdoors pool scuba sea seacoast seagrass seashell shell shore shoreline small snail submarine summer textured tidal tide top umbilicalis water