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Lyelliceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Acanthocerataceae
Family:
Lyelliceratidae
Formal Genus Name and Reference:
Lyelliceras SPATH, 1922a, p. 107
Type Species:
Ammonites lyelli ORBIGNY, 1841, p. 255, OD
Images
(Click to enlarge in a new window)
Fig. 113, 2a-c. *L. lyelli (Orbigny), Middle Albian, France, a, b, X 0.75, c, enlarged (Orbigny, 1840-1842).
Synonyms
Geographic Distribution
western Europe, Madagascar, Pakistan, Mexico, Colombia, Peru, Venezuela
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Lower Albian)
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
Moderately to very evolute, whorl section slightly compressed to circular, normally having straight radial ribs with 2 or 3 rows of lateral clavi and one row of siphonal clavi, but siphonal clavi effaced in some forms, tubercles normally dominant over ribs, ribs continuing straight over venter or zigzagging.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Acanthocerataceae
Family:
Lyelliceratidae
Formal Genus Name and Reference:
Lyelliceras SPATH, 1922a, p. 107
Type Species:
Ammonites lyelli ORBIGNY, 1841, p. 255, OD
Images
(Click to enlarge in a new window)
Fig. 113, 2a-c. *L. lyelli (Orbigny), Middle Albian, France, a, b, X 0.75, c, enlarged (Orbigny, 1840-1842).
Synonyms
Geographic Distribution
western Europe, Madagascar, Pakistan, Mexico, Colombia, Peru, Venezuela
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Lower Albian)
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
Moderately to very evolute, whorl section slightly compressed to circular, normally having straight radial ribs with 2 or 3 rows of lateral clavi and one row of siphonal clavi, but siphonal clavi effaced in some forms, tubercles normally dominant over ribs, ribs continuing straight over venter or zigzagging.