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Ptychodus decurrens Agassiz, 1838

Ptychodus_decurrens3.jpg Cosmopolitodus hastalisThumbnailsSqualicorax falcatus (Agassiz, 1843)Cosmopolitodus hastalisThumbnailsSqualicorax falcatus (Agassiz, 1843)Cosmopolitodus hastalisThumbnailsSqualicorax falcatus (Agassiz, 1843)Cosmopolitodus hastalisThumbnailsSqualicorax falcatus (Agassiz, 1843)Cosmopolitodus hastalisThumbnailsSqualicorax falcatus (Agassiz, 1843)Cosmopolitodus hastalisThumbnailsSqualicorax falcatus (Agassiz, 1843)Cosmopolitodus hastalisThumbnailsSqualicorax falcatus (Agassiz, 1843)

Shell-crushing shark tooth
Location: Shatsk (Ryazan region, Russia)
Upper Cretaceous
Scale bar divisions are millimeters.
Around 90 million years old