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Lythronax
''Lythronax'' is an extinct genus of tyrannosaurid theropod dinosaur that lived around 80.6 to 79.9 million years ago in what is now southern Utah, USA. The generic name is derived from the Greek words ''lythron'' meaning "gore" and ''anax'' meaning "king". ''Lythronax'' was a large sized, moderately-built, ground-dwelling, bipedal carnivore that could grow up to an estimated in length and weighed .
''L. argestes'' is the oldest known tyrannosaurid, based on its stratigraphic position. It is known from a specimen thought to be from a single adult that consists of a mostly complete skull, both pubic bones, a tibia, fibula, and metatarsal II and IV from the left hindlimb, as well as an assortment of other bones. Its skull anatomy indicates that, like ''Tyrannosaurus'', ''Lythronax'' had both eyes facing the front, giving it depth perception.
==Etymology==
''Lythronax'' was named for its likeness to ''Tyrannosaurus''. Loewen ''et al.'' wanted to symbolize that the fossil was alike in most features to the much later tyrannosaurid. They decided to keep the 'king' in the name and without using 'rex', named it ''Lythronax'', the "Gore King", accordingly. For the specific name they agreed to use ''argestes'', relating to the area where the fossil was found, southwest Utah.〔 The generic name is derived from the Greek λύθρον, ''lythron'', 'gore' and ἄναξ, ''anax'', 'king'. The specific name is the Greek ἀργεστής, "clearing", used by the poet Homer as the epithet of the southwind.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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