 Natura - nature | | Mundus Plinius - physical world | | Naturalia | | Biota | | Domain Eukaryota - eukaryotes | | Kingdom Animalia C. Linnaeus, 1758 - animals | | Subkingdom Bilateria (Hatschek, 1888) Cavalier-Smith, 1983 - bilaterians | | Branch Deuterostomia Grobben, 1908 - deuterostomes | | Infrakingdom Chordonia (Haeckel, 1874) Cavalier-Smith, 1998 | | Phylum Chordata Bateson, 1885 - chordates | | Subphylum Vertebrata Cuvier, 1812 - vertebrates | | Infraphylum Gnathostomata auct. - jawed vertebrates | | Superclass Tetrapoda Goodrich, 1930 - tetrapods | | Series Amniota | | Mammaliaformes Rowe, 1988 | | Class Mammalia C. Linnaeus, 1758 - mammals | | Subclass Theriiformes (Rowe, 1988) M.C. McKenna & S.K. Bell, 1997 | | Infraclass Holotheria (Wible et al., 1995) M.C. McKenna & S.K. Bell, 1997 | | Superlegion Trechnotheria McKenna, 1975 | | Legion Cladotheria McKenna, 1975 | | Sublegion Zatheria McKenna, 1975 | | Infralegion Tribosphenida (McKenna, 1975) M.C. McKenna & S.K. Bell, 1997 | | Supercohort Theria (Parker & Haswell, 1897) M.C. McKenna & S.K. Bell, 1997 - therians | | Cohort Placentalia (Owen, 1837) M.C. McKenna & S.K. Bell, 1997 - placentals | | Magnorder Xenarthra (Cope, 1889) M.C. McKenna & S.K. Bell, 1997 - xenarthrans | | Order Pilosa (Flower, 1883) McKenna, 1975 - sloths | | Suborder Folivora Delsuc et al., 2001 | | Infraorder Megatheria M.C. McKenna & S.K. Bell, 1997 | | Superfamily Megatherioidea™
(Gray, 1821) Cabrera, 1929 | | Family ‡Megatheriidae™
(Gray, 1821) Owen, 1842 | | Subfamily ‡Megatheriinae™
(Gray, 1821) Gill, 1872 | | Tribe ‡Nothrotheriini (Ameghino, 1920) M.C. McKenna & S.K. Bell, 1997 |  Genus †Thalassocnus |
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