Name: Cephalaspis.
Meaning: Head shield.
Grouping: Fish, Agnathan,
Osteostracan.
Infonnal ID: Armoured
jawless fish.
Fossil size: Head shield
width 12cm/4J{in.
Reconstructed size:
Head-tail length up to
30cm/20in.
Habitat: Rivers, estuaries,
perhaps also shallow
sea coasts.
Time span: Early Devonian,
400 million years ago.
Main fossil sites:
Throughout Europe.
Occurrence: ••