| 词条 | Calycoceras |
| 释义 |
| fossil_range = Cretaceous | image = Gasteropods - Ammonites - Calycoceras (Newboldiceras) spinosa.JPG | image_caption = Calycoceras asiaticum spinosum, Late Cretaceous (Cenomanian) from Madagascar, abt. 94 Mya | taxon = Calycoceras | authority = Hyatt, 1900 | subdivision_ranks = Species | subdivision =
| synonyms =
}}Calycoceras is an extinct genus of cephalopods belonging to the subclass Ammonoidea and family Acanthoceratidae that lived during the Cenomanian stage of the Late Cretaceous, 100-94 Mya.[1] Their shells had ornate ribs.[2] Species
DistributionCalycoceras species may be found in the Cretaceous of Angola, Antarctica, Canada (British Columbia), France, Germany, Japan, Nigeria, Oman, Russia, the United Kingdom, United States (Alaska, Arizona, Kansas, New Mexico, South Dakota, Utah) [3]C. asiaticum may be found in the Cenomanian of Canada, Southern England, northern and southern France, Spain, Romania, Bulgaria, Tunisia, Madagascar, south India and Japan.[3][9]C. cenomanense may be found in the Cenomanian of United Kingdom, France and Madagascar.[10][11][12][13]DescriptionShells of Calycoceras asiaticum may reach a diameter of about {{convert|20|cm}}. The larger phragmocones may reach {{convert|59|-|72|mm}} in diameter. Coiling is moderately involute. All ribs show strong subspinose tubercles. C. asiaticum asiaticum and C. asiaticum spinosum are very similar, the latter has much more robust tuberculation.[3][14] References1. ^Sepkoski, Jack Sepkoski's Online Genus Database – Cephalopodes {{Taxonbar|from=Q5024617}}{{ammonitina-stub}}{{Cretaceous-animal-stub}}2. ^Ammonites 3. ^1 2 3 4 5 William James Kennedy, Herbert Christian Klinger (2010) Cretaceous faunas from Zululand and Natal, South Africa. The ammonite subfamily Acanthoceratinae de Grossouvre, 1894 4. ^Global Names Index 5. ^AMNH 6. ^UMUT 7. ^Smithsonian Institutions 8. ^The Paleobiology Database 9. ^Paleobiology Database 10. ^ P. Moreau, I.H. Francis, W.J. Kennedy [https://www.researchgate.net/publication/222807311_Cenomanian_ammonites_from_northern_aquitaine Cenomanian ammonites from northern aquitaine] 11. ^ William James Kennedy, Ireneusz Walaszczyk, Andrew S. Gale, Krzysztof Dembicz, Tomasz Praszkier - Lower and Middle Cenomanian ammonites from the Morondava Basin, Madagascar 12. ^ W. J. Kennedy 1971. - Cenomanian Ammonites from Southern England. Special Papers in Palaeontology Number 8. v + 133 pp., 64 pls, 5 tables. The Palaeontological Association, London 13. ^ Sepkoski, Jack Sepkoski's Online Genus Database – Cephalopodes 14. ^Ammonites 7 : Acanthoceratidae|Ammonitida genera|Cretaceous ammonites|Late Cretaceous ammonites of North America|Late Cretaceous cephalopods of North America|Late Cretaceous animals of Africa|Cenomanian life |
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