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Noun: heterostracan  ,he-tu'ró-stru-kun
  1. Extinct jawless fish with the anterior part of the body covered with bony plates; of the Silurian and Devonian

Derived forms: heterostracans

Type of: agnathan, jawless fish, jawless vertebrate

Part of: Heterostraci, suborder Heterostraci

Encyclopedia: Heterostracan