Subclass
Theria (Therians)
Eumetopias jubatus. Photo: (c) Ryan Elliott, some rights reserved (CC BY)
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).