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Anisoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Turrilitaceae
Family:
Anisoceratidae
Formal Genus Name and Reference:
Anisoceras PICTET, 1854, p. 705
Type Species:
Hamites saussureanus PICTET, 1847, p. 374, OD
Images
(Click to enlarge in a new window)
Fig. 187, 3a-c. *A. saussureanum (Рістет), Upper Albian, France, a, b, X 1, c, enlarged (Pictet, 1847)."
Synonyms
Geographic Distribution
Europe, northern and eastern Africa, Madagascar, Pakistan, India, New Zealand, Alaska, Texas, Mexico
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Upper Albian)
Beginning International Stage:
Albian
Fraction Up In Beginning Stage:
50
Beginning Date:
106.85
Ending Stage in Treatise Usage:
Upper Cretaceous (Upper Turonian)
Ending International Stage:
Turonian
Fraction Up In Ending Stage:
100
Ending Date:
89.39
Description
Differs from Protanisoceras primarily in its more helicoid coiling, fibulate ribbing, and more complex suture with regularly bifid L and U, occasional subtrifid lobes occur.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Turrilitaceae
Family:
Anisoceratidae
Formal Genus Name and Reference:
Anisoceras PICTET, 1854, p. 705
Type Species:
Hamites saussureanus PICTET, 1847, p. 374, OD
Images
(Click to enlarge in a new window)
Fig. 187, 3a-c. *A. saussureanum (Рістет), Upper Albian, France, a, b, X 1, c, enlarged (Pictet, 1847)."
Synonyms
Geographic Distribution
Europe, northern and eastern Africa, Madagascar, Pakistan, India, New Zealand, Alaska, Texas, Mexico
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Upper Albian)
Beginning International Stage:
Albian
Fraction Up In Beginning Stage:
50
Beginning Date:
106.85
Ending Stage in Treatise Usage:
Upper Cretaceous (Upper Turonian)
Ending International Stage:
Turonian
Fraction Up In Ending Stage:
100
Ending Date:
89.39
Description
Differs from Protanisoceras primarily in its more helicoid coiling, fibulate ribbing, and more complex suture with regularly bifid L and U, occasional subtrifid lobes occur.