Petalifera
 Petalifera is a genus of sea slugs or sea hares marine gastropod mollusks belonging to the family Aplysiidae the sea hares. Some authors place this genus in a separate family Dolabriferidae. A new study published in September 2004 has shown that the genus Petalifera is paraphyletic.(Note: Gastropod taxonomy has been in flux for more than half a century and this is especially true currently because of new research in molecular phylogeny.