Gastropoda Cuvier, 1795 see Class Gastropoda Cuvier, 1795 Nudipleura Wägele & Willan, 2000 Pleurobranchoidea Gray, 1827 Family Pleurobranchidae Gray, 1827 Genus Berthella Blainville, 1824 Berthella plumula (Montagu, 1803)