Description: Cerithidea costata (da Costa, 1778) - apertural view of a costate horn snail shell, 2.05 cm tall. Family Potamididae - horn snails are algae scrapers or deposit feeders in intertidal marine, mangrove swamp, and mangrove-lined saline lake environments. Date: 20 February 2011, 22:09. Source: Cerithidea costata (costate horn snail) (San Salvador Island, Bahamas) 2. Author: James St. John.
