Name: Ceratodus.
Meaning: Horn tooth.
Grouping: Fish,
Osteichthyan, Sarcopterygian,
Dipneustian.
Informal ID: Lungfish.
Fossil size: Width 7cm/2%in.
Reconstructed size:
Head-tail length 50cm/20in.
Habitat: Shallow seas.
Time span: Early Triassic to
Ea~y Tertiary, 346-55 million
years ago.
Main fossil sites: liVorldwiae,
especially Europe and Africa.
Occurrence: •••