Subclass
Theria (Therians)
Physeter macrocephalus. Photo: (c) Wayne and Pam Osborn, some rights reserved (CC BY-NC)
Theria (/ˈθɪəriə/; Greek: θηρίον theríon, wild beast) is a subclass of mammals amongst the Theriiformes (the sister taxon to Yinotheria). Theria includes the eutherians (including the placental mammals) and the metatherians (including the marsupials).
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