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Cleoniceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Desmocerataceae
Family:
Cleoniceratidae
Formal Genus Name and Reference:
Cleoniceras Parona & BONARELLI, 1897, p. 83
Type Species:
Ammonites cleon ORBIGNY, 1850a, p. 124, OD
Images
(Click to enlarge in a new window)
FIG. 75,4a–c. *C. (C.) cleon (ORBIGNY), Lower Albian, France; a,b, ×1; c, ×2 (Casey, 1966).
Synonyms
Eocleoniceras
Geographic Distribution
western Europe, Transcaspia, Madagascar, northwestern India, Alaska, British Columbia
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Lower Albian, tardefurcata Zone)
Beginning International Stage:
Albian
Fraction Up In Beginning Stage:
0
Beginning Date:
113.2
Ending Stage in Treatise Usage:
Lower Cretaceous (Middle Albian)
Ending International Stage:
Albian
Fraction Up In Ending Stage:
50
Ending Date:
106.85
Description
Rather involute, compressed, venter arched to acute, rarely flat, typically with strong, sigmoid to falcoid ribs at some growth stage, single or springing in pairs from distinct umbilical bullae, commonly branching again or intercalated at midflank, tending to disappear on outer whorls of macroconchs, and commonly weak on venter
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Desmocerataceae
Family:
Cleoniceratidae
Formal Genus Name and Reference:
Cleoniceras Parona & BONARELLI, 1897, p. 83
Type Species:
Ammonites cleon ORBIGNY, 1850a, p. 124, OD
Images
(Click to enlarge in a new window)
FIG. 75,4a–c. *C. (C.) cleon (ORBIGNY), Lower Albian, France; a,b, ×1; c, ×2 (Casey, 1966).
Synonyms
Eocleoniceras
Geographic Distribution
western Europe, Transcaspia, Madagascar, northwestern India, Alaska, British Columbia
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Lower Albian, tardefurcata Zone)
Beginning International Stage:
Albian
Fraction Up In Beginning Stage:
0
Beginning Date:
113.2
Ending Stage in Treatise Usage:
Lower Cretaceous (Middle Albian)
Ending International Stage:
Albian
Fraction Up In Ending Stage:
50
Ending Date:
106.85
Description
Rather involute, compressed, venter arched to acute, rarely flat, typically with strong, sigmoid to falcoid ribs at some growth stage, single or springing in pairs from distinct umbilical bullae, commonly branching again or intercalated at midflank, tending to disappear on outer whorls of macroconchs, and commonly weak on venter