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Alligaticeras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Perisphinctaceae
Family:
Perisphinctidae
Formal Genus Name and Reference:
Alligaticeras BUCKMAN, 1923
Type Species:
A. alligatum (Leck.-Enby, 1859)
Images
(Click to enlarge in a new window)
Fig. 407,1. *A. alligatum (Leck.), U. Callov., Eng., 1a,b, x1 (65*)
Synonyms
Geographic Distribution
Eu.-Syria-Madag.-Cutch
Age Range
Beginning Stage in Treatise Usage:
M. Jur.(U.Callov.)
Beginning International Stage:
Callovian
Fraction Up In Beginning Stage:
70
Beginning Date:
162.66
Ending Stage in Treatise Usage:
U.Jur.(L.Oxf.)
Ending International Stage:
Oxfordian
Fraction Up In Ending Stage:
50
Ending Date:
158.16
Description
Small, whorls quadrate, constricted, finely ribbed, not modified on body chamber
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Perisphinctaceae
Family:
Perisphinctidae
Formal Genus Name and Reference:
Alligaticeras BUCKMAN, 1923
Type Species:
A. alligatum (Leck.-Enby, 1859)
Images
(Click to enlarge in a new window)
Fig. 407,1. *A. alligatum (Leck.), U. Callov., Eng., 1a,b, x1 (65*)
Synonyms
Geographic Distribution
Eu.-Syria-Madag.-Cutch
Age Range
Beginning Stage in Treatise Usage:
M. Jur.(U.Callov.)
Beginning International Stage:
Callovian
Fraction Up In Beginning Stage:
70
Beginning Date:
162.66
Ending Stage in Treatise Usage:
U.Jur.(L.Oxf.)
Ending International Stage:
Oxfordian
Fraction Up In Ending Stage:
50
Ending Date:
158.16
Description
Small, whorls quadrate, constricted, finely ribbed, not modified on body chamber