The Requienia (2011)

Phylum : Mollusca Class : Bivalvia Subclass : Heterodonta Order : Hippuritoida Family : Requieniidae Genus : Requienia Species : R. ammonia

Requienia is an extinct genus of fossil saltwater clam, a marine bivalve mollusk in the order Hippuritoida, family Requieniidae. These rudists lived in the Cretaceous period, from the Valanginian age to the Campanian age. They were stationary intermediate-level suspension feeders.