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Definition of Heterostracan
1. Noun. Extinct jawless fish with the anterior part of the body covered with bony plates; of the Silurian and Devonian.
Generic synonyms: Agnathan, Jawless Fish, Jawless Vertebrate
Group relationships: Heterostraci, Suborder Heterostraci
Group relationships: Heterostraci, Suborder Heterostraci