Ctenaspis (Ctenaspis kaieri) is an extinct genus of heterostracan cyathaspid agnathans from the early Devonian of Canada, Norway and Russia 416.0 to 412.3 million years ago.

C. kaieri has no adorbital opening and only two dorsal and ventral plates .

C. kiaeri has its branchial openings located at the posterior edge of armour.

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