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Nigericeras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Acanthocerataceae
Family:
Acanthoceratidae
Formal Genus Name and Reference:
Nigericeras SCHNEEGANS, 1943, p. 118
Type Species:
N. gignouxi, OD, =Acanthoceras (?) gaddeni CHUDEAU, 1909, p. 71
Images
(Click to enlarge in a new window)
Fig. 122, 2a-c. *N. gignouxi, Niger, a, X 0.75, b, X 0.5, c, X 1 (Schneegans, 1943).
Synonyms
Acanthoceras(?) gaddeni
Geographic Distribution
England, western Africa, Israel, Turkestan, Colorado, Texas
Age Range
Beginning Stage in Treatise Usage:
Upper Cretaceous (Upper Cenomanian)
Beginning International Stage:
Cenomanian
Fraction Up In Beginning Stage:
75
Beginning Date:
95.55
Ending Stage in Treatise Usage:
Upper Cretaceous (Upper Cenomanian)
Ending International Stage:
Cenomanian
Fraction Up In Ending Stage:
100
Ending Date:
93.9
Description
Acanthoceratine ornament of ribs and umbilical, inner and outer ventrolateral, and siphonal tubercles persisting to varying diameters up to 40 mm, thereafter, shell smooth except for strong to weak folds, which may be rursiradiate, weak siphonal ridge may be present, whorl section oval, round, or quadrate. Suture simplifying.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Acanthocerataceae
Family:
Acanthoceratidae
Formal Genus Name and Reference:
Nigericeras SCHNEEGANS, 1943, p. 118
Type Species:
N. gignouxi, OD, =Acanthoceras (?) gaddeni CHUDEAU, 1909, p. 71
Images
(Click to enlarge in a new window)
Fig. 122, 2a-c. *N. gignouxi, Niger, a, X 0.75, b, X 0.5, c, X 1 (Schneegans, 1943).
Synonyms
Acanthoceras(?) gaddeni
Geographic Distribution
England, western Africa, Israel, Turkestan, Colorado, Texas
Age Range
Beginning Stage in Treatise Usage:
Upper Cretaceous (Upper Cenomanian)
Beginning International Stage:
Cenomanian
Fraction Up In Beginning Stage:
75
Beginning Date:
95.55
Ending Stage in Treatise Usage:
Upper Cretaceous (Upper Cenomanian)
Ending International Stage:
Cenomanian
Fraction Up In Ending Stage:
100
Ending Date:
93.9
Description
Acanthoceratine ornament of ribs and umbilical, inner and outer ventrolateral, and siphonal tubercles persisting to varying diameters up to 40 mm, thereafter, shell smooth except for strong to weak folds, which may be rursiradiate, weak siphonal ridge may be present, whorl section oval, round, or quadrate. Suture simplifying.