Of the belemnites thought to be extinct, the Challenger Expedition discovered the living fossil genus:

Name: Of the belemnites thought to be extinct, the Challenger Expedition discovered the living fossil genus:
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The living fossil genus discovered by the Challenger Expedition is Spirula, which belongs to the belemnites group. Latimeria is a living fossil coelacanth fish, Neopilina is a living fossil mollusk, and Calyptegena is a genus of deep-sea clams.

Of the Belemnites Thought to Be Extinct, the Challenger Expedition