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The Holotheria are a group of mammals.
Therefore, the group does not include the monotremes.
References[change | change source]
- Wible J.R; Rougier G.W; Novacek M.J. & McKenna M.C. 2001. Earliest eutherian ear region: a petrosal referred to Prokennalestes from the Early Cretaceous of Mongolia". American Museum Novitates, 3322.