florida horse conch in background

background pattern isolated horse ocean natural shape decoration invertebrate seashell shell variety hobby beaches exoskeleton identification size snails collection cephalopods conchology combination malacology gastropods buy pleuroploca gigantea outer layer beachcombers brown coiled shells protective commercial trade molluscan triplofusus papillosus fasciolariidae calcium carbonate hard mix serpulidae florida conch form sea snail marine urchin mollusks gastropod mollusc