Diplomoceras

Diplomoceras is a genus of ammonites included in the family Diplomoceratidae.^[2] Fossils of species within this genus have been found in the Late Cretaceous sediments (age range: Campanian-Maastrichtian).^[3][4] D. maximum had coiled shell length about 1.5 m (4.9 ft), uncoiled shell being 3 m (9.8 ft) to over 4 m (13 ft), with body chamber around 2 m (6.6 ft).^[5][6][7] Some partial specimens may belong to shell with length around 1.7 m (5.6 ft).^[8] Studies of Diplomoceras suggest that members of this genus could reach lifespans of over 200 years.^[9]

Diplomoceras Temporal range: Late Cretaceous, Campanian–Maastrichtian PreꞒ Ꞓ O S D C P T J K Pg N
Life restoration of Diplomoceras around Aristonectes
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Ammonitida
Suborder:	†Ancyloceratina
Family:	†Diplomoceratidae
Genus:	†Diplomoceras Hyatt, 1900
Type species
Diplomoceras cylindraceum Hyatt, 1900
Species[1]
†D. cascadense Anderson, 1958 †D. cylindraceum (DeFrance, 1816) †D. jimboi Anderson, 1958 †D. mercedense Anderson, 1958 †D. mustangense Anderson, 1958 †D. oshaughnessyi Anderson, 1958 †D. vernaculare Anderson, 1958
Synonyms
Baculites cylindracea DeFrance, 1816