rare cymbiola nobilis marine seashell

animal animalia aragoniet background black calcareous calciet calcium carbonate chalk chitin chitons clams closeup cockleshell collectors conch conchology conchs cradles cymbiola ecology exoskeleton expensive invertebrate item life malacology mantle marine membrane mollusca molluscs mollusks nature nobilis normal organism rare salt scallops sea seashell shape shell skeleton species studio valves white