Ammonite

Additional images

Uneven coils

Ammonites with uneven coils like these are called heteromorph ammonites. The shells of this ammonite were coiled tightly when it was young and wider as it got older. Why? No-one is really sure but this must have had a profound impact on how the animal lived. It is thought that Scaphites probably floated in the water filtering it with adapted tentacles in order to capture microscopic food. But as no soft parts have been found so far, we may never know.

Find out more about ammonites on the molluscs pages.

Common name

Ammonite

Scientific name

Scaphites equalis

Type

Molluscs > Cephalopods


Strata

Chalk, Lower

Time period

Upper Cretaceous

Age

96 million years

Where found

Eggardon Hill

Found by

Unknown

Museum

Dorset County Museum, Dorchester

Accession number

DCM.G.09700