Heterostracan definitions

Heterostracan

1) Agnathan 2) Jawless fish 3) Jawless vertebrate
Found on https://www.crosswordclues.com/clue/heterostracan

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heterostracan

[n] - extinct jawless fish with the anterior part of the body covered with bony plates
Found on http://www.webdictionary.co.uk/definition.php?query=heterostracan

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heterostracan

noun extinct jawless fish with the anterior part of the body covered with bony plates; of the Silurian and Devonian
Found on https://www.encyclo.co.uk/local/20974

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