An extinct group of early armored fish (agnathans) from the Paleozoic era, characterized by a cuplike shield covering the head and body.
From cyath- (cup) + aspis (shield, from Greek). The name literally means 'cup-shield,' describing their distinctive armor.
Cyathaspis were some of the first armored vertebrates, swimming around 500 million years ago with shields that made them look like tiny medieval tanks made of bone.
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