アメリカ自然史博物館のインスタグラム(amnh) - 6月21日 04時05分

Today, we’re celebrating ‪#‎CephalopodWeek with one of our favorites–the amazing ammonite.
The extinct mollusks known as ammonites inhabited the planet for more than 300 million years—almost twice as long as dinosaurs—before disappearing in the mass extinction event more than 65 million years ago. As many as 10,000 species may have existed, ranging from tiny organisms that measured only a fraction of an inch across to formidable animals more than 2 feet (0.6 meters) in diameter, such as the spectacular 75-million-year-old specimen shown here, which is on view in the Museum’s Grand Gallery.

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