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Crioceratites
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Ancylocerataceae
Family:
Ancyloceratidae
Formal Genus Name and Reference:
Crioceratites LÉVEILLÉ, 1837, p. 313
Type Species:
C. duvalii, SD DIENER, 1925, p. 191
Images
(Click to enlarge in a new window)
Fig. 164, 5a-c. C. (C.) nolani (Kilian), Upper Hauterivian, France, a, b, X 0.25, c, X 0.5 (Orbigny, 1840-1842). Fig. 164, 5d. C. (C.) trinodosum (Thieuloy), Upper Valanginian, France, X 0.5 (Thieuloy, 1965). Fig. 164, 5e. C. (C.) binelli (Astier), Upper Hauterivian, France, X 1 (Thomel, 1964).
Synonyms
Crioceras, ?Hoplitocrioceras
Geographic Distribution
Europe, southern Russia, Turkey, South Africa (Zululand), Madagascar, Japan, California, Mexico, South America
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Upper Valanginian)
Beginning International Stage:
Valanginian
Fraction Up In Beginning Stage:
45
Beginning Date:
135.41
Ending Stage in Treatise Usage:
Lower Cretaceous (Upper Barremian)
Ending International Stage:
Barremian
Fraction Up In Ending Stage:
100
Ending Date:
121.4
Description
Typically coiled in equiangular spiral, but spiral angle may increase with age, whorl section oval to subquadrate, with more or less trapezoidal top, ribs generally dense, rounded, straight to flexuous, single or bundled at umbilical edge, and untuberculate, stronger major ribs strengthened on shoulders or with ventrolateral or umbilical, lateral, and ventrolateral spines, constrictions may be present.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Ancylocerataceae
Family:
Ancyloceratidae
Formal Genus Name and Reference:
Crioceratites LÉVEILLÉ, 1837, p. 313
Type Species:
C. duvalii, SD DIENER, 1925, p. 191
Images
(Click to enlarge in a new window)
Fig. 164, 5a-c. C. (C.) nolani (Kilian), Upper Hauterivian, France, a, b, X 0.25, c, X 0.5 (Orbigny, 1840-1842). Fig. 164, 5d. C. (C.) trinodosum (Thieuloy), Upper Valanginian, France, X 0.5 (Thieuloy, 1965). Fig. 164, 5e. C. (C.) binelli (Astier), Upper Hauterivian, France, X 1 (Thomel, 1964).
Synonyms
Crioceras, ?Hoplitocrioceras
Geographic Distribution
Europe, southern Russia, Turkey, South Africa (Zululand), Madagascar, Japan, California, Mexico, South America
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Upper Valanginian)
Beginning International Stage:
Valanginian
Fraction Up In Beginning Stage:
45
Beginning Date:
135.41
Ending Stage in Treatise Usage:
Lower Cretaceous (Upper Barremian)
Ending International Stage:
Barremian
Fraction Up In Ending Stage:
100
Ending Date:
121.4
Description
Typically coiled in equiangular spiral, but spiral angle may increase with age, whorl section oval to subquadrate, with more or less trapezoidal top, ribs generally dense, rounded, straight to flexuous, single or bundled at umbilical edge, and untuberculate, stronger major ribs strengthened on shoulders or with ventrolateral or umbilical, lateral, and ventrolateral spines, constrictions may be present.