| Named By: | Hyatt in 1900 |
| Time Period: | Cretaceous |
| Location: | Worldwide distribution with fossil site locations including Antarctica - Lopez de Bertodano Formation, Santa Marta Formation. Australia - Korojon Calcarenite Formation, Miria Formatio. Belgium - Craie de Ciply Formation, Maastricht Formation. Chile - Quiriquina Formation, Rio Blanco Formation, Santa Ana Formation. Denmark - Danish White Chalk Formation. France - Craie de Valognes Formation, Les Vignes Formation. Greenland. Japan - Senpohshi Formation. Netherlands - Maastricht Formation. Russia. South Africa. Spain - Vallcarga Formation. Tunisia. USA, Alabama - Prairie Bluff Formation;, Alaska - Kaguyak Formation, Matanuska Formation; California - Moreno Formation; Mississippi - Prairie Bluff Formation; Texas - Corsicana Marl Formation, Escondido Formation |
| Size: | Large individuals had shells up to 2 meters across (4 meters or more when you account for the shell winding) |
| Diet: | Carnivore/Piscivore |
| Fossil(s): | Well over a hundred specimens known from shells with varying degrees of preservation |
| Classification: | | Animalia | Mollusca | Cephalopoda | |
| Also known as: | | Eudiplomoceras | |
Diplomoceratidae is a family of ammonites included in the order Ammonitida. Fossils of species within this genus have been found in the Cretaceous sediments.(age range: from 99.7 to 66.043 million years ago).