Douvilleiceras mammillatum
- kingdom: Animalia
- phylum: Mollusca
- class: Cephalopoda
- order: Ammonoidea
- family: Douvilleiceratidae
- genus: Douvilleiceras
- species: Douvilleiceras mammillatum
- France
Folkestone
Leighton Buzzard
England
United KingdomCanyon Lake
Texas
United States