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]
| Calycoceras Temporal range: Cretaceous
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_spinosa.JPG)
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| Calycoceras asiaticum spinosum, Late Cretaceous (Cenomanian) from Madagascar, abt. 94 Mya | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | †Ammonoidea |
| Order: | †Ammonitida |
| Family: | †Acanthoceratidae |
| Subfamily: | †Acanthoceratinae |
| Genus: | †Calycoceras Hyatt, 1900 |
| Species | |
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| Synonyms | |
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Species
edit- C. algeriense Kennedy & Gale, 2017
- C. annulatum Collignon, 1964
- C. asiaticum (Jimbo, 1894)[3]
- C. besairieri Collignon, 1937
- C. boreale Kennedy, Cobban & Landman, 1996 [4]
- C. dromense (Thomel, 1972) [5]
- C. cenomanense (d’Archiac, 1846)
- C. navicularis (Mantell, 1822)
- C. orientale Matsumoto, Saito & Fukada [6]
- C. paucinodatum (Crick) [7]
- C. tarrantense[8]
Distribution
editCalycoceras 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]
Description
editShells of Calycoceras asiaticum may reach a diameter of about 20 centimetres (7.9 in). The larger phragmocones may reach 59–72 millimetres (2.3–2.8 in) 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]
References
edit- ^ Sepkoski, Jack Sepkoski's Online Genus Database – Cephalopodes
- ^ Ammonites
- ^ a b c d e f William James Kennedy, Herbert Christian Klinger (2010) Cretaceous faunas from Zululand and Natal, South Africa. The ammonite subfamily Acanthoceratinae de Grossouvre, 1894
- ^ Global Names Index
- ^ AMNH
- ^ UMUT
- ^ Smithsonian Institutions
- ^ The Paleobiology Database
- ^ Paleobiology Database
- ^ P. Moreau, I.H. Francis, W.J. Kennedy Cenomanian ammonites from northern aquitaine
- ^ William James Kennedy, Ireneusz Walaszczyk, Andrew S. Gale, Krzysztof Dembicz, Tomasz Praszkier - Lower and Middle Cenomanian ammonites from the Morondava Basin, Madagascar
- ^ 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
- ^ Sepkoski, Jack Sepkoski's Online Genus Database – Cephalopodes
- ^ Ammonites
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