Ammonite

The specimen that defines a species

This is a really significant specimen as it is a ‘holotype’, meaning it defines the species Reineckia duplex. If anyone wants to identify a similar find, they would need to come back to this specimen in order to make comparisons.  

The fossil is also unusual in that the mouth border is complete and includes a strange extension of the shell known as a lappet.

Find out more about ammonites on the molluscs pages.

Common name

Ammonite

Scientific name

Reineckia (reineckeiles) duplex

Type

Molluscs > Cephalopods


Strata

Oxford Clay

Time period

Upper Jurassic

Age

160 million years

Where found

Weymouth

Found by

Unknown

Museum

Dorset County Museum, Dorchester

Accession number

DCM.G.02946