An extinct genus of cephalopods with curved, horn-like shells, common as fossils in ancient seas.
From Greek 'kyrtos' (curved) and 'keras' (horn). Named by 19th-century paleontologists for the distinctive curved shape of their preserved shells.
Finding a Cyrtoceras fossil today means you're holding the shell of a creature that swam Earth's oceans 500 million years before dinosaurs evolved.
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