heterostracan

heterostracan

[het-uh-ros-truh-kuhn]
noun Paleontology.
any of several ostracoderms of the order Heterostraci, from the Silurian and Devonian Periods, having the anterior part of the body enclosed in bony plates.

Origin:
< Neo-Latin Heterostrac(i) (plural) name of the order, equivalent to heter- heter- + Greek ostrak(ón) (singular) shell + -an

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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 
WordNet® 3.0, © 2006 by Princeton University.
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