| Ctenaspis
416.0-412.3 mya | |
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| C. dentata | |
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Ctenaspis
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| Binomial name | |
| C. kiaeri Zych, 1931 | |
Ctenaspis (Ctenaspis kaieri) is an extinct genusofheterostracan cyathaspid agnathans from the early DevonianofCanada, Norway and Russia 416.0 to 412.3 million years ago. Species of Ctenaspis are typically 10 to 18 cm long with the max length being 40 cm long. The genus contains only one known species, namely Ctenaspis kaieri.
C. kaieri has no adorbital opening and only two dorsal and ventral plates . The dorsal plate is fused with branchials and the plates notably thin. C. kiaeri has its branchial openings located at the posterior edge of armour. The dorsal shield is flat.[1]
| Ctenaspis |
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