ostracoderm


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ostracoderm

[′ä·strə·kō‚dərm]
(paleontology)
Any of various extinct jawless vertebrates covered with an external skeleton of bone which together with the Cyclostomata make up the class Agnatha.
References in periodicals archive ?
A new cephalaspid fish from the Downtonian of Scotland, with notes on the structure and classification of ostracoderms.