An extinct marine reptile from the early Mesozoic era, known from fossil remains found in rocks dating back hundreds of millions of years.
From Greek 'eos' (dawn) and 'saurus' (lizard), literally meaning 'dawn lizard' because it represents one of the earliest known large marine reptiles in Earth's history.
The name perfectly captures how paleontologists think about deep time—they use 'eos' to name creatures from the very beginning of life's story, treating Earth's history like the pages of a book opening at dawn.
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