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Calycoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Acanthocerataceae
Family:
Acanthoceratidae
Formal Genus Name and Reference:
Calycoceras HYATT, 1900, p. 589
Type Species:
Ammonites navicularis Mantell, 1822, p. 198, ICZN Specific Name No. 1633
Images
(Click to enlarge in a new window)
Fig. 125a–f. *C. (C.) naviculare (MANTELL ); a–d, Upper Cenomanian, England; a,b, holotype, × 0.7; c,d, × 1 (Kennedy, 1971); e,f, Upper Cenomanian, Angola, × 0.75 (H. Douvillé, 1931).
Synonyms
Metacalycoceras
Geographic Distribution
Europe, Africa, Madagascar, Syria, Iran, southern India, Papua New Guinea, Japan, USA, Argentina
Age Range
Beginning Stage in Treatise Usage:
Upper Cretaceous (Cenomanian)
Beginning International Stage:
Cenomanian
Fraction Up In Beginning Stage:
0
Beginning Date:
100.5
Ending Stage in Treatise Usage:
Upper Cretaceous (Cenomanian)
Ending International Stage:
Cenomanian
Fraction Up In Ending Stage:
100
Ending Date:
93.9
Description
Rather evolute, with whorl section depressed and subcircular, oval, polygonal, or subquadrate, ribs strong, generally straight, continuous over rounded or flat but not concave venter, on early whorls at least umbilical, ventrolateral, siphonal, and, in most specimens, midlateral tubercles
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Acanthocerataceae
Family:
Acanthoceratidae
Formal Genus Name and Reference:
Calycoceras HYATT, 1900, p. 589
Type Species:
Ammonites navicularis Mantell, 1822, p. 198, ICZN Specific Name No. 1633
Images
(Click to enlarge in a new window)
Fig. 125a–f. *C. (C.) naviculare (MANTELL ); a–d, Upper Cenomanian, England; a,b, holotype, × 0.7; c,d, × 1 (Kennedy, 1971); e,f, Upper Cenomanian, Angola, × 0.75 (H. Douvillé, 1931).
Synonyms
Metacalycoceras
Geographic Distribution
Europe, Africa, Madagascar, Syria, Iran, southern India, Papua New Guinea, Japan, USA, Argentina
Age Range
Beginning Stage in Treatise Usage:
Upper Cretaceous (Cenomanian)
Beginning International Stage:
Cenomanian
Fraction Up In Beginning Stage:
0
Beginning Date:
100.5
Ending Stage in Treatise Usage:
Upper Cretaceous (Cenomanian)
Ending International Stage:
Cenomanian
Fraction Up In Ending Stage:
100
Ending Date:
93.9
Description
Rather evolute, with whorl section depressed and subcircular, oval, polygonal, or subquadrate, ribs strong, generally straight, continuous over rounded or flat but not concave venter, on early whorls at least umbilical, ventrolateral, siphonal, and, in most specimens, midlateral tubercles