Microbiotheria Ameghino 1889

Families: 1 family with 1 genus and 1 species:

Family Microbiotheriidae Ameghino 1887 (1 genus with 1 species)

Discussion: Traditionally included in Marsupialia. Included in order Polyprotodonta by Reig et al. (1987); considered a separate order by Aplin and Archer (1987) and Marshall et al. (1990). Phylogenetically allied with australidelphian marsupials (e.g., Spotorno et al., 1997; Burk et al., 1999).