Concise hierarchy
	(Kingdom) Animalia - (Phylum) Chordata - (Class) Mammalia
Current position
Alternative positions
	Historical positions
	
		
			| Metatheria (Clade) Huxley 1880 [O'Leary, Allard, Novacek, Meng & Gatesy 2004] | 
				Ref: 
					
						É.V. Oliveira et al., 2021: fig. 6.
					 | 
			
			
				| Metatheria (Clade) Huxley 1880 [O'Leary, Allard, Novacek, Meng & Gatesy 2004] | 
					Ref: 
						
							L.M. Carneiro et al., 2018: 122, fig. 5.
						 | 
				
				
					| Metatheria (Infraclass) Huxley, 1880 | 
						Ref: 
							
								S. Bi et al., 2018: fig. 4.
							 | 
					
				
				Number of Subtaxa