"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 ...
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placental mammals) and the metatherians (including the marsupials). Therian mammals are the dominant group of terrestrial amniotes on Earth since replacing the Non-Avian Dinosaurs due to the K-PG Extinction event" - (en.wikipedia.org 19.09.2020)
