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nounfrom 425 million to 405 million years ago; first air-breathing animals
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Definition that contains silurian
- heterostracan extinct jawless fish with the anterior part of the body covered with bony plates; of the Silurian and Devonian
- anaspid extinct small freshwater jawless fish usually having a heterocercal tail and an armored head; of the Silurian and Devonian