Which of the following are the extinct classes of fishes?

Pterichthys

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Coccosteus

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Acanthodii

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All of the above

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Solution

The correct option is D All of the above
Pterichthys is a genus of Devonian fossil fishes with winglike appendages.
Coccostei or seed bone is an extinct genus of arthrodire placoderm (pre-historic fishes).
Acanthodii is a paraphyletic class of extinct fishes, sharing features with both bony and cartilaginous fishes. Thus, the correct answer is option D.

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