Supergroup Rhizaria Cavalier-Smith, 2002 see Infrakingdom Rhizaria Cavalier-Smith, 2002 Phylum Foraminifera d'Orbigny, 1826 see Subphylum Foraminifera d'Orbigny, 1826 Class Astrorhizata Saidova, 1981 Subclass Lagynana Mikhalevich, 1980 Order Ammoscalariida Mikhalevich, 1980 Family Phthanotrochidae Arnold, 1978 Genus Phthanotrochus Arnold, 1978