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Didymoceras ✝

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Description

Didymoceras is an extinct genus of ammonite cephalopod from the Late Cretaceous epoch (approximately 76 Ma). It is one of the most bizarrely shaped genera, with a shell that spirals upwards into a loose, hooked tip. It is thought to have drifted in the water vertically, moving up and down. The generic name is Latin for "paired horns".

From Wikipedia article at https://en.wikipedia.org/wiki/Didymoceras, which is released under the Creative Commons Attribution-Share-Alike License 3.0.

Source Data

Source	ID	Link
Global Biodiversity Information Facility ID (GBIF)	7235210	https://www.gbif.org/species/7235210
PaleoBioDB ID (PBDB)	14774	https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=14774

Rank

genus

Taxonomy (GBIF)

Life : Animalia : Mollusca : Cephalopoda : Ammonoidea : Nostoceratidae : Didymoceras

Taxonomy (PBDB)

Life : Animalia : Mollusca : Cephalopoda : Ammonitida : Nostoceratidae : Didymoceras

Taxonomic Status (GBIF)

accepted

Classification
(PBDB,GBIF)

Rank	Name	Author
-	Eukaryota
-	Opisthokonta	Cavalier-Smith 1987
kingdom	Animalia
-	Bilateria
-	Eubilateria	Ax 1987
-	Protostomia	Grobben 1908
-	Spiralia
superphylum	Lophotrochozoa
phylum	Mollusca	Linnaeus 1758
class	Cephalopoda	Cuvier 1797
subclass	Ammonoidea
order	Ammonitida	Hyatt 1889
suborder	Ancyloceratina	Wiedmann 1966
superfamily	Turrilitoidea
family	Nostoceratidae	Hyatt 1894
genus	Didymoceras	Hyatt 1894

Scientific Name

Didymoceras Hyatt, 1894

Name Published In

Proc. Amer. Phil. Soc., 32

Opinions (PBDB)

Name	Rank	Opinion	Evidence	Author
Didymoceras	genus	belongs to Nostoceratidae	stated with evidence	Reyment, 1955
Didymoceras	genus	belongs to Turrilitidae	stated without evidence	Zaborski, 1985
Didymoceras	genus	belongs to Nostoceratidae	stated with evidence	Kennedy and Cobban, 1993
Didymoceras	subgenus	belongs to Nostoceras	stated with evidence	Wright et al., 1996
Didymoceras	genus	belongs to Nostoceratidae	stated with evidence	Kennedy and Cobban, 1997
Didymoceras	genus	belongs to Ammonoidea	second hand	Sepkoski, 2002
Didymoceras	genus	belongs to Nostoceratidae	stated with evidence	Ifrim et al., 2015

Status (PBDB)

extinct

Taxon Size (PBDB)

First Recorded Appearance

101 - 90 Ma
Late/Upper Cretaceous

Last Recorded Appearance

72.1 - 66.0 Ma
Late/Upper Cretaceous

Motility

fast-moving (based on Ammonoidea)

Vision

well-developed (based on Cephalopoda)

Diet

carnivore (based on Ammonoidea)

Taphonomy

aragonite (based on Ammonoidea)

Primary Reference (PBDB)

J. J. Sepkoski, Jr. 2002. A compendium of fossil marine animal genera. Bulletins of American Paleontology 363:1-560

Wikipedia

https://en.wikipedia.org/wiki/Didymoceras

Fossil Distribution

Subtaxa

Name	Status	Common Name(s)	Fossil Occurrences	Oldest	Youngest
Didymoceras angulatum ✝ species	accepted (GBIF) listed (PBDB)
Didymoceras aurarium ✝ species	accepted (GBIF) listed (PBDB)		1	83.5 Ma Late/Upper Cretaceous	83.5 Ma Late/Upper Cretaceous
Didymoceras awajiense ✝ species	accepted (GBIF) listed (PBDB)		2	83.5 Ma Late/Upper Cretaceous	83.5 Ma Late/Upper Cretaceous
Didymoceras binodosum ✝ species	accepted (GBIF) listed (PBDB)		6	83.6 Ma Late/Upper Cretaceous	83.5 Ma Late/Upper Cretaceous
Didymoceras californicum ✝ species	accepted (GBIF) listed (PBDB)		1	83.5 Ma Late/Upper Cretaceous	83.5 Ma Late/Upper Cretaceous
Didymoceras cheyenense ✝ species	accepted (GBIF) listed (PBDB)
Didymoceras cheyenensis species	accepted (GBIF)	No associated record in PBDB
Didymoceras cheyennense ✝ species	listed (PBDB)		8	83.5 Ma Late/Upper Cretaceous	83.5 Ma Late/Upper Cretaceous
Didymoceras cochleatus ✝ species	accepted (GBIF) listed (PBDB)
Didymoceras donezianum ✝ species	accepted (GBIF) listed (PBDB)		3	83.5 Ma Late/Upper Cretaceous	83.5 Ma Late/Upper Cretaceous
Didymoceras draconis ✝ species	accepted (GBIF) listed (PBDB)		8	83.5 Ma Late/Upper Cretaceous	83.5 Ma Late/Upper Cretaceous
Didymoceras fresnoense ✝ species	listed (PBDB)
Didymoceras hidakense ✝ species	accepted (GBIF) listed (PBDB)		2	83.5 Ma Late/Upper Cretaceous	83.5 Ma Late/Upper Cretaceous
Didymoceras hornbyense ✝ species	accepted (GBIF) listed (PBDB)		9	83.6 Ma Late/Upper Cretaceous	72.1 Ma Late/Upper Cretaceous
Didymoceras jorgenseni species	accepted (GBIF)	No associated record in PBDB
Didymoceras nebrascense ✝ species	accepted (GBIF) listed (PBDB)		7	83.5 Ma Late/Upper Cretaceous	83.5 Ma Late/Upper Cretaceous
Didymoceras newtoni ✝ species	accepted (GBIF) listed (PBDB)
Didymoceras nicolletii ✝ species	accepted (GBIF) listed (PBDB)
Didymoceras orestimbense ✝ species	listed (PBDB)
Didymoceras platycostatum ✝ species	accepted (GBIF) listed (PBDB)		3	83.5 Ma Late/Upper Cretaceous	83.5 Ma Late/Upper Cretaceous
Didymoceras puebloense species	accepted (GBIF)	No associated record in PBDB
Didymoceras stevensoni ✝ species	accepted (GBIF) listed (PBDB)		9	83.5 Ma Late/Upper Cretaceous	83.5 Ma Late/Upper Cretaceous
Didymoceras subtuberculatum ✝ species	accepted (GBIF) listed (PBDB)		1	83.5 Ma Late/Upper Cretaceous	83.5 Ma Late/Upper Cretaceous
Didymoceras tenuicostatus ✝ species	accepted (GBIF) listed (PBDB)
Didymoceras tortus ✝ species	accepted (GBIF) listed (PBDB)
Didymoceras tricostatus ✝ species	accepted (GBIF) listed (PBDB)
Didymoceras umbilicatus ✝ species	accepted (GBIF) listed (PBDB)
Didymoceras uncus ✝ species	accepted (GBIF) listed (PBDB)
Didymoceras vancouverensis ✝ species	listed (PBDB)		4	83.5 Ma Late/Upper Cretaceous	72.1 Ma Late/Upper Cretaceous
Didymoceras vespertinus ✝ species	accepted (GBIF) listed (PBDB)
Didymoceras wrighti species	accepted (GBIF)	No associated record in PBDB
Hamites vancouverensis species	accepted (GBIF)	No associated record in PBDB

Synonymy List

Year	Name and Author
1894	Emperoceras Hyatt p. 575
1900	Didymoceras Hyatt
1955	Didymoceras Reyment p. 13
1976	Didymoceras Atabekyan and Khakimov p. 43
1979	Didymoceras Wright p. 294
1985	Didymoceras Morozumi p. 34
1985	Didymoceras Zaborski p. 14
1993	Didymoceratoides Kennedy and Cobban p. 90
1993	Didymoceras Kennedy and Cobban p. 421
1994	Didymoceras Kennedy and Cobban p. 1290
1995	Didymoceras Kennedy and Bilotte p. 364

Year	Name and Author
1996	Nostoceras (Didymoceras) Wright et al. p. 247
1997	Didymoceras Kennedy and Cobban p. 67
1999	Didymoceras Kennedy and Summesberger p. 26
2000	Didymoceras Kennedy p. 469
2000	Didymoceras Kennedy et al. p. 9
2000	Didymoceras Kennedy et al. p. 6
2002	Didymoceras Sepkoski, Jr.
2002	Emperoceras Sepkoski, Jr.
2015	Didymoceras Ifrim et al. p. 246
2016	Didymoceras Shigeta p. 345

References

Sepkoski, Jr. J. J. (2002) A compendium of fossil marine animal genera, Bulletins of American Paleontology 363, 1-560

Reyment R. A. (1955) The Cretaceous Ammonoidea of southern Nigeria and the southern Cameroons, Geological Survey of Nigeria Bulletin 25, 1-112

Atabekyan A. A., Khakimov F. K. (1976) , Kampanskie i Maastrikhtskie ammonity sredney Azii, 1-146

Wright C. W. (1979) The ammonites of the English Chalk Rock (Upper Turonian), Bulletin of the British Museum of Natural History (Geology) 31, 281-332

Morozumi Y. (1985) Late Cretaceous (Campanian and Maastrichtian) ammonites from Awaji Island, southwest Japan, Bulletin of the Osaka Museum of Natural History 39, 1-58

Zaborski P. M. P. (1985) Upper Cretaceous ammonites from the Calabar region, south-east Nigeria, Bull. Br. Mus. nat. Hist. (Geol.) 39 1, 1-72

Kennedy W. J., Cobban W. A. (1993) Ammonites from the Saratoga Chalk (Upper Cretaceous), Arkansas, Journal of Paleontology 67 3, 404-434

Kennedy W. J., Cobban W. A. (1994) Upper Campanian ammonites from the Mount Laurel Sand at Biggs Farm, Delaware, Journal of Paleontology 68 6, 1285-1305

Kennedy W. J., Bilotte M. (1995) A new ammonite fauna from the sub-Pyrenean Campanian (Upper Cretaceous), Geobios 28 3, 359-370

Wright C. W., Calloman J. H., et al (1996) Cretaceous Ammonoidea, Treatise on Invertebrate Paleontology L 4, 1-362

Kennedy W. J., Cobban W.A (1997) Upper Campanian (Upper Cretaceous) ammonites from the Marshalltown Formation-Mount Laurel boundary beds in Delaware, Journal of Paleontology 71 1, 62-73

Kennedy W. J., Summesberger H. (1999) New Late Campanian ammonites from the Gschliefgraben near Gmuden (Ultrahelvetic, Austria), Beiträge zur Paläontologie 24, 23-39

Kennedy W. J. (2000) Systematic paleontology, in Upper Campanian (Cretaceous) ammonites from the Shinarish Formation, Djebel Sinjar, northwest Iraq, Journal of Paleontology 74 3, 464-473

Kennedy W. J., Cobban W. A., et al (2000) Heteromorph ammonites from the Upper Campanian (Upper Cretaceous) Baculites cuneatus and Baculites reesidei zones of the Pierre Shale in Colorado, USA, Acta Geologica Polonica 50, 1-20

Kennedy W. J., Landman N. H., et al (2000) Late Campanian (Cretaceous) heteromorph ammonites, Bulletin of the American Museum of Natural History 251, 1-88

Ifrim C., Stinnesbeck W., et al (2015) Upper Campanian (Upper Cretaceous) cephalopods from the Parras Shale near Saucedas, Coahuila, Mexico, Journal of South American Earth Sciences 64, 229-257

Shigeta Y. (2016) Paleontological description, in Middle and late Campanian (Late Cretaceous) ammonoids from the Urakawa area, Hokkaido, northern Japan, Paleontological Research 20, 322-366

Nomenclator Zoologicus. A list of the names of genera and subgenera in zoology from the tenth edition of Linnaeus, 1758 to the end of 2004. Digitised by uBio from vols. 1-9 of Neave (ed.), 1939-1996 plus supplementary digital-only volume. http://ubio.org/NomenclatorZoologicus (as at 2006). - via The Interim Register of Marine and Nonmarine Genera

Sepkoski, J. J., Jr. (2002). A compendium of fossil marine animal genera. Bulletins of American Paleontology. 363, 1-560. - via The Interim Register of Marine and Nonmarine Genera

Proc. Amer. Phil. Soc., 32 - via The Interim Register of Marine and Nonmarine Genera

Data courtesy of: PBDB: The Paleobiology Database, Creative Commons CC-BY licenced. , GBIF: the Global Biodiversity Information Facility, various licences, iDigBio, various licences, and EOL: The Encyclopedia of Life (Open Data Public Domain). Because fossils are made of minerals too!

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