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Oxyaenidae (superorder Ferae, order Creodonta) An extinct family of carnivores that appeared during the late Palaeocene and flourished during the Eocene, but were extinct by its end. The large, deep jaw was mounted on a broad skull and in most forms carnassials were developed from the first and second molars. Most oxyaenids were rather like mustelids in shape, although Paleonictis resembled a cat.