An extinct genus of armored fish from ancient times with a large shield-like head covering.
From Greek 'kephalē' (head) + 'aspis' (shield). The name perfectly describes these primitive fish, which had hard bony plates protecting their heads like a medieval shield.
Cephalaspis swam in ancient seas over 350 million years ago, and their heavy armor plates were so effective that they barely needed bodies—they were basically heads with shields, representing an early evolutionary strategy for survival!
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