Cephalaspis (pronounced SEFF-ah-LASS-pis) means “head shield”, which fits this genus of fish quite well. Although their heads was covered in armour these fish were jawless, and are assumed to have played a role similar to the modern catfish, feeding on small organisms on the bottom of freshwater streams. The head plate had three indentations, which could have housed sensory organs sensitive to vibrations or even primitive electric organs. They lived in Devonian Europe, and it is believed their head shield served to protect them from the carnivorous placoderms around at the time.

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