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] 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).[4][5][6] Some partial specimens may belong to shell with length around 1.7 m (5.6 ft).[7] Studies of Diplomoceras suggest that members of this genus could reach lifespans of over 200 years.[8]

Diplomoceras
Temporal range: Late Cretaceous,
Life restoration of Diplomoceras around Aristonectes
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: †Ammonoidea
Order: †Ammonitida
Suborder: †Ancyloceratina
Family: †Diplomoceratidae
Genus: †Diplomoceras
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

References
  1. F. M. Anderson. (1958). Upper Cretaceous of the Pacific Coast. Geological Society of America Memoir 71:1-378
  2. Spath L. F. (1926). A Monograph of the Ammonoidea of the Gault; Part VI. Palaeontographical Society London
  3. Paleobiology database
  4. Zinsmeister, WJ; Oleinik, AE (1995). "Discovery of a remarkably complete specimen of the giant cephalopod Diplomoceras maximum from the Late Cretaceous of Seymour Island, Antarctica". Antarctic Journal of the United States.
  5. Syracuse University; Artruc, Emily G.; Ivany, Linda C. (2016). "GROWTH RATE AND ECOLOGY OF THE GIANT HETEROMORPH AMMONITE DIPLOMOCERAS MAXIMUM USING STABLE ISOTOPES OF ACCRETIONARY SHELL CARBONATE". doi:10.1130/abs/2016NE-272500. {{cite journal}}: Cite journal requires |journal= (help)
  6. "Giant Heteromorph Ammonite". Paleontological Research Institution. 2023-07-25.
  7. Masukawa, Genya; Ando, Hisao (2018-11-01). "Late Campanian–early Maastrichtian heteromorph-dominated ammonoid assemblages of the Nakaminato Group, central Honshu, Japan: biostratigraphic and paleontological implications". Cretaceous Research. 91: 362–381. doi:10.1016/j.cretres.2018.06.018. ISSN 0195-6671.
  8. Sullivan, Rory (4 November 2020). "Large squid-like creature that looked like a giant paperclip lived for 200 years — 68 million years ago". The Independent. Archived from the original on 4 November 2020.
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