[het-uh-ros-truh-kuh n]
noun Paleontology.
  1. 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 of heterostracan

< New Latin Heterostrac(i) (plural) name of the order, equivalent to heter- heter- + Greek ostrak(ón) (singular) “shell” + -an
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Historical Examples of heterostracan