pearly-shelled mussel

English Thesaurus

1. the pearly lining of the dark shells is a source of mother-of-pearl (noun.animal)

hypernym	:	freshwater clam, freshwater mussel,
definition	:	bivalve mollusk abundant in rivers of central United States (noun.animal)

member meronym	:	genus unio, unio,
definition	:	type genus of the family Unionidae (noun.animal)