Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Spiralia
Cladus: Lophotrochozoa
Phylum: Mollusca
Classis: Cephalopoda
Subclassis: †Ammonoidea
Ordo: †Ammonitida
Subordo: †Ammonitina
Superfamilia: Acanthocerataceae
Familia: † Acanthoceratidae
Subfamilia: † Acanthoceratinae
Genus: Calycoceras
Name
Calycoceras Hyatt, 1900
References
The Paleobiology Database Accessed on 12/12/08
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
C. algeriense Kennedy & Gale, 2017
C. annulatum Collignon, 1964
C. asiaticum (Jimbo, 1894)[3]
C. a. asiaticum (Jimbo, 1894)[3]
C. a. spinosum (Kossmat, 1897)[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
Calycoceras 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]
Calycoceras orientale, Late Cretaceous from Japan.
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.[3][14]
References
Sepkoski, Jack Sepkoski's Online Genus Database – Cephalopodes
Ammonites
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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