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Dufrenoyia
Classification
Phylum:
Unknown
Class:
Unknown
Order:
Unknown
Superfamily:
Deshayesitaceae
Family:
Deshayesitidae
Formal Genus Name and Reference:
Dufrenoyia Kilian & REBOUL, 1915, p. 37
Type Species:
Ammonites furcatus J. de C. Sowerby, in FITTON, 1836, p. 339, OD
Images
(Click to enlarge in a new window)
FIG. 212,2a,b. *D. furcata (J. de C. SOWERBY), Lower Aptian, England; × 1 (Casey, 1964).——F IG . 212,2c,d. D. dufrenoyi (ORBIGNY), Upper Aptian, France; ×1 (Orbigny, 1840–1842).
Synonyms
Dufrenoya, Juandurhamiceras
Geographic Distribution
Europe, Ja
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Lower Aptian)
Beginning International Stage:
Aptian
Fraction Up In Beginning Stage:
0
Beginning Date:
121.4
Ending Stage in Treatise Usage:
Upper Aptian, ?Lower Albian
Ending International Stage:
Albian
Fraction Up In Ending Stage:
25
Ending Date:
110.03
Description
Compressed, with sides and venter flat, ribs more or less sinuous, fine or coarse, commonly broad and flat, branching or long and short, interrupted at first on venter, later continuous, raised in at least some growth stage into ventrolateral clavi. In macroconchs up to 400 mm in diameter, angularity of shoulders lost, but venter remaining flat and ribs strengthening. Derived directly from Deshayesites.
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Unknown
Order:
Unknown
Superfamily:
Deshayesitaceae
Family:
Deshayesitidae
Formal Genus Name and Reference:
Dufrenoyia Kilian & REBOUL, 1915, p. 37
Type Species:
Ammonites furcatus J. de C. Sowerby, in FITTON, 1836, p. 339, OD
Images
(Click to enlarge in a new window)
FIG. 212,2a,b. *D. furcata (J. de C. SOWERBY), Lower Aptian, England; × 1 (Casey, 1964).——F IG . 212,2c,d. D. dufrenoyi (ORBIGNY), Upper Aptian, France; ×1 (Orbigny, 1840–1842).
Synonyms
Dufrenoya, Juandurhamiceras
Geographic Distribution
Europe, Ja
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Lower Aptian)
Beginning International Stage:
Aptian
Fraction Up In Beginning Stage:
0
Beginning Date:
121.4
Ending Stage in Treatise Usage:
Upper Aptian, ?Lower Albian
Ending International Stage:
Albian
Fraction Up In Ending Stage:
25
Ending Date:
110.03
Description
Compressed, with sides and venter flat, ribs more or less sinuous, fine or coarse, commonly broad and flat, branching or long and short, interrupted at first on venter, later continuous, raised in at least some growth stage into ventrolateral clavi. In macroconchs up to 400 mm in diameter, angularity of shoulders lost, but venter remaining flat and ribs strengthening. Derived directly from Deshayesites.