According to the fossil record, which of these jawed fishes diversified in the Devonian and Carboniferous periods, but left no direct descendants?

Name: According to the fossil record, which of these jawed fishes diversified in the Devonian and Carboniferous periods, but left no direct descendants?
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Placoderms were a class of armored prehistoric fish that diversified significantly during the Devonian period but became extinct by the end of the Devonian, leaving no direct descendants.

According to the Fossil Record, Which of These Jawed Fishes