Calycoceras asiaticum

Calycoceras asiaticum
Temporal range: Cretaceous
Calycoceras asiaticum spinosum, Late Cretaceous (Cenomanian) from Madagascar, abt. 94 Mya
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Ammonoidea
Order: Ammonitida
Family: Acanthoceratidae
Genus: Calycoceras
Species: C. asiaticum
Binomial name
Calycoceras asiaticum
(Jimbo, 1894)

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

[1]

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

  1. 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
  2. ↑ Sepkoski, Jack Sepkoski's Online Genus Database – Cephalopodes
  3. ↑ Ammonites
  4. 1 2 Paleobiology Database
  5. ↑ Ammonites
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