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Spitidiscus
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Desmocerataceae
Family:
Desmoceratidae
Formal Genus Name and Reference:
Spitidiscus KILIAN, 1910c, p. 264
Type Species:
Ammonites rotula J. de C. Sowerby, 1827b, p. 136, SD ROMAN, 1938, p. 389
Images
(Click to enlarge in a new window)
Fig. 49, 1a-c. *S. rotula (J. de C. Sowerby), Hauterivian, England, a, b, X 1, c, enlarged (Pavlow, 1892).
Synonyms
Geographic Distribution
England, France, Spain, Austria
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Upper Valanginian)
Beginning International Stage:
Valanginian
Fraction Up In Beginning Stage:
45
Beginning Date:
135.41
Ending Stage in Treatise Usage:
Lower Cretaceous (Upper Hauterivian, ?Lower Barremian)
Ending International Stage:
Barremian
Fraction Up In Ending Stage:
50
Ending Date:
123.95
Description
Rather involute to rather evolute, whorl section more or less circular to flat-sided, frequent constrictions straight or slightly sinuous, moderately deep but wide, truncating low, single or rarely branching ribs. Earliest species have slight umbilical tubercles.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Desmocerataceae
Family:
Desmoceratidae
Formal Genus Name and Reference:
Spitidiscus KILIAN, 1910c, p. 264
Type Species:
Ammonites rotula J. de C. Sowerby, 1827b, p. 136, SD ROMAN, 1938, p. 389
Images
(Click to enlarge in a new window)
Fig. 49, 1a-c. *S. rotula (J. de C. Sowerby), Hauterivian, England, a, b, X 1, c, enlarged (Pavlow, 1892).
Synonyms
Geographic Distribution
England, France, Spain, Austria
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Upper Valanginian)
Beginning International Stage:
Valanginian
Fraction Up In Beginning Stage:
45
Beginning Date:
135.41
Ending Stage in Treatise Usage:
Lower Cretaceous (Upper Hauterivian, ?Lower Barremian)
Ending International Stage:
Barremian
Fraction Up In Ending Stage:
50
Ending Date:
123.95
Description
Rather involute to rather evolute, whorl section more or less circular to flat-sided, frequent constrictions straight or slightly sinuous, moderately deep but wide, truncating low, single or rarely branching ribs. Earliest species have slight umbilical tubercles.