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*aka “placental mammals”*
/juːˈθɪəriə/
from Greek εὐ-, eu-
“true/good”
and
θηρίον, thēríon “beast”
(hence “true beasts”)
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(“eutheria” is one of two mammalian clades with extant members that diverged in the early cretaceous or perhaps the “late jurassic”)
(except for the ‘virginia opossum’, from ‘north america’, which is a ‘metatherian’, all ‘mammals’ indigenous to ‘europe’, ‘africa’, ‘asia’, and ‘north america’ north of ‘Mexico’ are ‘eutherians’)
(extant ‘eutherians’, their last common ancestor, and all extinct descendants of that ancestor are members of “placentalia”)
(‘eutherians’ are distinguished from ‘noneutherians’ by various phenotypic traits of the ‘feet’, ‘ankles’, ‘jaws’, and ‘teeth’)
(all extant ‘eutherians’ lack ‘epipubic bones’, which are present in all other living ‘mammals’ (‘marsupials’ and ‘monotremes’))
(this allows for expansion of the ‘abdomen’ during ‘pregnancy’)
(the oldest known eutherian species is Juramaia sinensis, dated at 160 million years ago from the ‘Jurassic’ in ‘China’)
(“eutheria” was named in 1872 by ‘theodore gill’)
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*in 1880 ‘thomas henry huxley’ defined it to encompass a more broadly defined group than “placentalia”*
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💕💝💖💓🖤💙🖤💙🖤💙🖤❤️💚💛🧡❣️💞💔💘❣️🧡💛💚❤️🖤💜🖤💙🖤💙🖤💗💖💝💘
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*🌈✨ *TABLE OF CONTENTS* ✨🌷*
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🔥🔥🔥🔥🔥🔥*we won the war* 🔥🔥🔥🔥🔥🔥