Diplomoceras is a genus of ammonites included in the family Diplomoceratidae.Spath L. F. (1926). A Monograph of the Ammonoidea of the Gault; Part VI. Palaeontographical Society London Fossils of species within this genus have been found in the Late Cretaceous sediments (age range: Campanian-Maastrichtian).Paleobiology database D. maximum had coiled shell length about , uncoiled shell being to over , with body chamber around . Some partial specimens may belong to shell with length around . Studies of Diplomoceras suggest that members of this genus could reach lifespans of over 200 years.
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