A group of extinct armored fish from ancient times characterized by their tough, bony head shields with a ganoid-type surface coating.
From Greek ganos (lustre) plus kephale (head). The term describes fish whose heads were covered in that distinctive shiny, enamel-like substance found on primitive fish scales and armor.
Ganocephalans were some of the first fish to evolve armored heads—imagine wearing a knight's helmet made of the same lustrous material found on modern fish scales, 400 million years before knights were even invented!
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