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Lewesiceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Desmocerataceae
Family:
Pachydiscidae
Formal Genus Name and Reference:
Lewesiceras SPATH, 1939b, p. 296
Type Species:
Ammonites peramplus MANTELL, 1822, p. 200, OD
Images
(Click to enlarge in a new window)
Fig. 78, 2a, b. L. mantelli Wright & Wright, Upper Turonian, England, ×1 (Sharpe, 1853-1857)
Synonyms
Geographic Distribution
Europe, northern Africa, Madagascar, central Asia, southern India, Japan, Montana
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 Turonian, ?Coniacian)
Ending International Stage:
Coniacian
Fraction Up In Ending Stage:
100
Ending Date:
85.7
Description
Early whorls with ribs and constrictions much as in early whorls of Eopachydiscus but with more or less strong umbilical tubercles and with ribs more sinuous and persisting to a later stage, later whorls tending to become smooth, more compressed, and higherwhorled. Sutures well spaced, with simple and massive elements, and rather less finely frilled than in Eopachydiscus.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Desmocerataceae
Family:
Pachydiscidae
Formal Genus Name and Reference:
Lewesiceras SPATH, 1939b, p. 296
Type Species:
Ammonites peramplus MANTELL, 1822, p. 200, OD
Images
(Click to enlarge in a new window)
Fig. 78, 2a, b. L. mantelli Wright & Wright, Upper Turonian, England, ×1 (Sharpe, 1853-1857)
Synonyms
Geographic Distribution
Europe, northern Africa, Madagascar, central Asia, southern India, Japan, Montana
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 Turonian, ?Coniacian)
Ending International Stage:
Coniacian
Fraction Up In Ending Stage:
100
Ending Date:
85.7
Description
Early whorls with ribs and constrictions much as in early whorls of Eopachydiscus but with more or less strong umbilical tubercles and with ribs more sinuous and persisting to a later stage, later whorls tending to become smooth, more compressed, and higherwhorled. Sutures well spaced, with simple and massive elements, and rather less finely frilled than in Eopachydiscus.