Ключевые слова: animal, calcareous, calcium, carbonate, chalk, chitin, chitons, clams, collectors, conch, conchology, conchs, ecology, exoskeleton, invertebrate, malacology, mantle, marine, mollusca, molluscs, mollusks, organism, scallops, sea, seashell, shape, shell, skeleton, species, valves, white,