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Acanthoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Acanthocerataceae
Family:
Acanthoceratidae
Formal Genus Name and Reference:
Acanthoceras NEUMAYR, 1875b, p. 929
Type Species:
Ammonites rhotomagensis Brongniart in Cuvier & Brongniart, 1822, p. 83, SD GROSSOUVRE, 1894, p. 27
Images
(Click to enlarge in a new window)
Fig. 119, 3a-c. *A. rhotomagense (Brongniart in Cuvier & Brongniart), Lower Cenomanian, France, a, b, lectotype, X, c, topotype, X (Kennedy & Hancock, 1970)
Synonyms
Metacanthoplites
Geographic Distribution
Europe, Africa, Iran, southern India, Japan, northern Australia, USA, Peru
Age Range
Beginning Stage in Treatise Usage:
Upper Cretaceous (Lower Cenomanian)
Beginning International Stage:
Cenomanian
Fraction Up In Beginning Stage:
0
Beginning Date:
100.5
Ending Stage in Treatise Usage:
Upper Cretaceous (Upper Cenomanian)
Ending International Stage:
Cenomanian
Fraction Up In Ending Stage:
100
Ending Date:
93.9
Description
Early whorls with round to square whorl section and with umbilical, inner and outer (generally clavate) ventrolateral, and siphonal tubercles, distinct ribs, if present, branching or long and short. Later whorls with ribs, single and uniform or long and short, sometimes weakening, umbilical tubercles may enlarge and move up side, ventrolaterals may fuse to form large horn, while siphonals may disappear, leaving broad, flat venter.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Acanthocerataceae
Family:
Acanthoceratidae
Formal Genus Name and Reference:
Acanthoceras NEUMAYR, 1875b, p. 929
Type Species:
Ammonites rhotomagensis Brongniart in Cuvier & Brongniart, 1822, p. 83, SD GROSSOUVRE, 1894, p. 27
Images
(Click to enlarge in a new window)
Fig. 119, 3a-c. *A. rhotomagense (Brongniart in Cuvier & Brongniart), Lower Cenomanian, France, a, b, lectotype, X, c, topotype, X (Kennedy & Hancock, 1970)
Synonyms
Metacanthoplites
Geographic Distribution
Europe, Africa, Iran, southern India, Japan, northern Australia, USA, Peru
Age Range
Beginning Stage in Treatise Usage:
Upper Cretaceous (Lower Cenomanian)
Beginning International Stage:
Cenomanian
Fraction Up In Beginning Stage:
0
Beginning Date:
100.5
Ending Stage in Treatise Usage:
Upper Cretaceous (Upper Cenomanian)
Ending International Stage:
Cenomanian
Fraction Up In Ending Stage:
100
Ending Date:
93.9
Description
Early whorls with round to square whorl section and with umbilical, inner and outer (generally clavate) ventrolateral, and siphonal tubercles, distinct ribs, if present, branching or long and short. Later whorls with ribs, single and uniform or long and short, sometimes weakening, umbilical tubercles may enlarge and move up side, ventrolaterals may fuse to form large horn, while siphonals may disappear, leaving broad, flat venter.