Diplomoceratidae

{{Short description|Extinct family of ammonites}}

{{Automatic taxobox

| fossil_range = {{Fossil range|Cretaceous }}

| image = Diplomoceratidae - Scalarites scalaris.JPG

| image_caption = Scalarites scalaris

| taxon = Diplomoceratidae

| authority = Spath, 1926 Spath L. F. 1926. A Monograph of the Ammonoidea of the Gault; Part VI. Palaeontographical Society London

}}

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).[https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=95939 Paleobiology database] Studies of Diplomoceras suggest that members of this family could reach lifespans of over 200 years.{{Cite news|last=Sullivan|first=Rory|date=4 November 2020|title=Large squid-like creature that looked like a giant paperclip lived for 200 years — 68 million years ago|work=The Independent|url=https://www.independent.co.uk/news/long_reads/science-and-technology/ancient-squid-paperclip-shell-200-year-life-b1591785.html|url-status=live|archive-url=https://web.archive.org/web/20201104171127/https://www.independent.co.uk/news/long_reads/science-and-technology/ancient-squid-paperclip-shell-200-year-life-b1591785.html|archive-date=4 November 2020}}