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Desmoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Desmocerataceae
Family:
Desmoceratidae
Formal Genus Name and Reference:
Desmoceras ZITTEL, 1885, p. 465
Type Species:
Ammonites latidorsatus Michelin, 1838, p. 101, SD ВӦНМ, 1895, p. 364
Images
(Click to enlarge in a new window)
Fig. 63, 3a-c. *D. (P.) japonica (Yabe), ?Cenomanian, Japan, X0.5 (Yabe, 1904)."
Synonyms
Latidorsella, Phyllodesmoceras, Lunatodorsella
Geographic Distribution
Europe, Africa, Madagascar, southern India, Japan, Australia (Queensland), New Zealand, Alaska, British Columbia, California, Texas, Venezuela
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Upper Aptian)
Beginning International Stage:
Aptian
Fraction Up In Beginning Stage:
66
Beginning Date:
115.99
Ending Stage in Treatise Usage:
Upper Cretaceous (Lower Turonian)
Ending International Stage:
Turonian
Fraction Up In Ending Stage:
25
Ending Date:
92.77
Description
Moderately to very involute, with cadicone, depressed-rounded, subquadrate, or oval section, with or without straight to sigmoid constrictions forming strong, rounded ribs on shell, with dense striae or feeble ribs between constrictions on outer part of side and venter
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Desmocerataceae
Family:
Desmoceratidae
Formal Genus Name and Reference:
Desmoceras ZITTEL, 1885, p. 465
Type Species:
Ammonites latidorsatus Michelin, 1838, p. 101, SD ВӦНМ, 1895, p. 364
Images
(Click to enlarge in a new window)
Fig. 63, 3a-c. *D. (P.) japonica (Yabe), ?Cenomanian, Japan, X0.5 (Yabe, 1904)."
Synonyms
Latidorsella, Phyllodesmoceras, Lunatodorsella
Geographic Distribution
Europe, Africa, Madagascar, southern India, Japan, Australia (Queensland), New Zealand, Alaska, British Columbia, California, Texas, Venezuela
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Upper Aptian)
Beginning International Stage:
Aptian
Fraction Up In Beginning Stage:
66
Beginning Date:
115.99
Ending Stage in Treatise Usage:
Upper Cretaceous (Lower Turonian)
Ending International Stage:
Turonian
Fraction Up In Ending Stage:
25
Ending Date:
92.77
Description
Moderately to very involute, with cadicone, depressed-rounded, subquadrate, or oval section, with or without straight to sigmoid constrictions forming strong, rounded ribs on shell, with dense striae or feeble ribs between constrictions on outer part of side and venter