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Cheloniceras
Classification
Phylum:
Unknown
Class:
Unknown
Order:
Unknown
Superfamily:
Douvilleicerataceae
Family:
Douvilleiceratidae
Formal Genus Name and Reference:
Cheloniceras HYATT, 1903, p. 101
Type Species:
Ammonites cornuelianus ORBIGNY, 1841, p. 364, ICZN Specific Name No. 1040
Images
(Click to enlarge in a new window)
FIG. 208,4a,b. *C. (C.) cornuelianum (ORBIGNY), France; ×0.75 (Orbigny, 1841).
Synonyms
Geographic Distribution
Europe, eastern Africa, South Africa, Madagascar, Egypt (Sinai), Iran, Japan, California, Texas, Mexico, South America
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Upper Aptian)
Beginning International Stage:
Aptian
Fraction Up In Beginning Stage:
66
Beginning Date:
115.99
Ending Stage in Treatise Usage:
Lower Cretaceous (Upper Aptian)
Ending International Stage:
Aptian
Fraction Up In Ending Stage:
100
Ending Date:
113.2
Description
Moderately evolute, whorl section circular to depressed, at some stage with lateral and umbilical tubercles, ribs branching at lateral tubercles and intercalated, shoulders rounded, angulate, or with tubercles. In late stages lateral tubercles disappearing and ribs branching from umbilical tubercles. Suture with long E and very broad, asymmetrically bifid L.
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Unknown
Order:
Unknown
Superfamily:
Douvilleicerataceae
Family:
Douvilleiceratidae
Formal Genus Name and Reference:
Cheloniceras HYATT, 1903, p. 101
Type Species:
Ammonites cornuelianus ORBIGNY, 1841, p. 364, ICZN Specific Name No. 1040
Images
(Click to enlarge in a new window)
FIG. 208,4a,b. *C. (C.) cornuelianum (ORBIGNY), France; ×0.75 (Orbigny, 1841).
Synonyms
Geographic Distribution
Europe, eastern Africa, South Africa, Madagascar, Egypt (Sinai), Iran, Japan, California, Texas, Mexico, South America
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Upper Aptian)
Beginning International Stage:
Aptian
Fraction Up In Beginning Stage:
66
Beginning Date:
115.99
Ending Stage in Treatise Usage:
Lower Cretaceous (Upper Aptian)
Ending International Stage:
Aptian
Fraction Up In Ending Stage:
100
Ending Date:
113.2
Description
Moderately evolute, whorl section circular to depressed, at some stage with lateral and umbilical tubercles, ribs branching at lateral tubercles and intercalated, shoulders rounded, angulate, or with tubercles. In late stages lateral tubercles disappearing and ribs branching from umbilical tubercles. Suture with long E and very broad, asymmetrically bifid L.