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 ?
The Early Devonian fish beds of the Midland Valley are considered lacustrine (Trewin and Davidson 1996; Braddy 2000, 2001), with Pterygotus anglicus at sites such as Tillywhandland sharing 'Lake Forfar' with acanthodians (Mesacanthus, Ischnacanthus and Euthacanthus) and ostracoderms (Cephalaspis pagei).
Uusi ostrakoderme Saaremaa Eurypterus-lademest [New Ostracoderms from the Eurypterus-Beds of Saaremaa].
Les Cyclostomes fossiles ou ostracodermes. In Traite de Paleontologie, vol.