Calycoceras asiaticum
| Calycoceras asiaticum Temporal range: Cretaceous
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_spinosa.JPG)
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| Calycoceras asiaticum spinosum, Late Cretaceous (Cenomanian) from Madagascar, abt. 94 Mya | |
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| Species: | C. asiaticum
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| Binomial name | |
| Calycoceras asiaticum (Jimbo, 1894)
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Calycoceras asiaticum is an extinct cephalopod species belonging to the subclass Ammonoidea and family Acanthoceratidae. [1]
They lived during the Cenomanian stage of the Late Cretaceous, from 99.7 to 94.3 Mya.[1][2] [3][4]
Subspecies
- Calycoceras (Newboldiceras) asiaticum asiaticum (Jimbo, 1894)
- Calycoceras (Newboldiceras) asiaticum spinosum (Kossmat, 1897)
Description
Shells 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.[1][5]
Distribution
Calycoceras asiaticum may be found in the Cenomanian of Canada, Southern England, northern and southern France, Spain, Romania, Bulgaria, Tunisia, Madagascar, south India and Japan. [1][4]
References
- ^ a b c d e William James Kennedy, Herbert Christian Klinger (2010) Cretaceous faunas from Zululand and Natal, South Africa. The ammonite subfamily Acanthoceratinae de Grossouvre, 1894
- ^ Sepkoski, Jack Sepkoski's Online Genus Database – Cephalopodes
- ^ Ammonites
- ^ a b Paleobiology Database
- ^ Ammonites
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