heterostracan
/het-uh-ros-truh-kuhn/US // ˌhɛt əˈrɒs trə kən //
异体人,异质性,异体字,异质纤维素
Definitions
n.名词 noun
- 1
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.
Examples
Older than the latter is the heterostracan, Pteraspis, and Cyathaspis.
The best known of the Heterostracan families is that of Pteraspidæ.
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