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Prionocyclus
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Acanthocerataceae
Family:
Collignoniceratidae
Formal Genus Name and Reference:
Prionocyclus MEEK, 1871b, p. 298
Type Species:
Ammonites serratocarinatus Meek, 1871a, p. 429, non StolicZKA, 1864, p. 57, =Prionocyclus wyomingensis MEEK, 1876, p. 452, SD
Images
(Click to enlarge in a new window)
Fig. 142, 4a, b. *P. wyomingensis, Wyoming, X 0.75 (White, 1880)
Synonyms
Geographic Distribution
Germany, Croatia, Tunisia, Angola, Japan, USA, Mexico
Age Range
Beginning Stage in Treatise Usage:
Upper Cretaceous (Turonian)
Beginning International Stage:
Turonian
Fraction Up In Beginning Stage:
0
Beginning Date:
93.9
Ending Stage in Treatise Usage:
Upper Cretaceous (Turonian)
Ending International Stage:
Turonian
Fraction Up In Ending Stage:
100
Ending Date:
89.39
Description
Differs from Collignoniceras in its generally denser and finer ribs, which are irregular in strength and length on outer whorl and dominant over tubercles at least at some stage, venter rather broad, with ribs joining keel, which has more serrations than there are ribs.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Acanthocerataceae
Family:
Collignoniceratidae
Formal Genus Name and Reference:
Prionocyclus MEEK, 1871b, p. 298
Type Species:
Ammonites serratocarinatus Meek, 1871a, p. 429, non StolicZKA, 1864, p. 57, =Prionocyclus wyomingensis MEEK, 1876, p. 452, SD
Images
(Click to enlarge in a new window)
Fig. 142, 4a, b. *P. wyomingensis, Wyoming, X 0.75 (White, 1880)
Synonyms
Geographic Distribution
Germany, Croatia, Tunisia, Angola, Japan, USA, Mexico
Age Range
Beginning Stage in Treatise Usage:
Upper Cretaceous (Turonian)
Beginning International Stage:
Turonian
Fraction Up In Beginning Stage:
0
Beginning Date:
93.9
Ending Stage in Treatise Usage:
Upper Cretaceous (Turonian)
Ending International Stage:
Turonian
Fraction Up In Ending Stage:
100
Ending Date:
89.39
Description
Differs from Collignoniceras in its generally denser and finer ribs, which are irregular in strength and length on outer whorl and dominant over tubercles at least at some stage, venter rather broad, with ribs joining keel, which has more serrations than there are ribs.