Learn how to say Bivalves correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word bivalve:
an aquatic mollusc which has a compressed body enclosed within a hinged shell, such as oysters, mussels, and scallops. Also called pelecypod or lamellibranch.
Class Bivalvia (formerly Pelecypoda or Lamellibranchia)
1(of a mollusc or other aquatic invertebrate) having a hinged double shell.
2 Botany having two valves.