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. (December 2016)
Theriiformes is a subclass of mammals. The term was coined in 1997 by McKenna & Bell in their classification of mammals. In the strict sense, it is defined as all mammals more closely related to therians than to monotremes.
- ^ McKenna, Malcolm; Bell, Susan (March 15, 1997). Classification of Mammals Above the species Level (Hardback) (first ed.). New York City: Columbia University Press. ISBN 978-0231110129.