Requienia is an extinct genus of fossil saltwater clam, a marine bivalve molluscs in the order Hippuritida, family Requieniidae.

They were stationary intermediate-level suspension feeders.

This genus occurs in the Cretaceous of Albania (collection), Croatia, France, Germany, Hungary, Iraq, Italy, Mexico, Oman, Portugal, Serbia and Montenegro, Spain, Switzerland, Turkey, Ukraine, United States, Venezuela; Jurassic of Hungary.

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