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Xenocephalites
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Haplocerataceae
Family:
Macrocephalitidae
Formal Genus Name and Reference:
Xenocephalites SPATH, 1928
Type Species:
Macrocephalites neuquenensis STEHN, 1924
Images
(Click to enlarge in a new window)
Fig. 352,13. *X. neuquenensis (Stehn), Arg., x1 (492*)
Synonyms
Geographic Distribution
S.Am.-Mex.-S.Alaska-Greenl.
Age Range
Beginning Stage in Treatise Usage:
Callov.
Beginning International Stage:
Callovian
Fraction Up In Beginning Stage:
0
Beginning Date:
165.29
Ending Stage in Treatise Usage:
Callov.
Ending International Stage:
Callovian
Fraction Up In Ending Stage:
100
Ending Date:
161.53
Description
Ribbing very coarse, biplicate with widely splayed secondaries
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Haplocerataceae
Family:
Macrocephalitidae
Formal Genus Name and Reference:
Xenocephalites SPATH, 1928
Type Species:
Macrocephalites neuquenensis STEHN, 1924
Images
(Click to enlarge in a new window)
Fig. 352,13. *X. neuquenensis (Stehn), Arg., x1 (492*)
Synonyms
Geographic Distribution
S.Am.-Mex.-S.Alaska-Greenl.
Age Range
Beginning Stage in Treatise Usage:
Callov.
Beginning International Stage:
Callovian
Fraction Up In Beginning Stage:
0
Beginning Date:
165.29
Ending Stage in Treatise Usage:
Callov.
Ending International Stage:
Callovian
Fraction Up In Ending Stage:
100
Ending Date:
161.53
Description
Ribbing very coarse, biplicate with widely splayed secondaries