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Subprionocyclus
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Ammonitida
Suborder:
Ammonitina
Superfamily:
Acanthocerataceae
Family:
Collignoniceratidae
Subfamily:
Collignoniceratinae
Formal Genus Name and Reference:
Subprionocyclus SHIMIZU, 1932, p. 2
Type Species:
Prionocyclus hitchinensis BILLINGHURST, 1927, p. 516, OD
Images
(Click to enlarge in a new window)
F IG . 141,1a,b. *S. hitchinensis (BILLINGHURST), England; ×EINITZ 1 (Wright, 1979).—FIG. 141,1c,d. S. neptuni (G ), England; c, ×1; d, enlarged (Woods, 1896).
Synonyms
Oregoniceras, Ledoceras
Geographic Distribution
western Europe, Angola, Japan, California, Oregon, Brazil
Age Range
Beginning Stage in Treatise Usage:
Upper Cretaceous (Upper Turonian)
Beginning International Stage:
Turonian
Fraction Up In Beginning Stage:
75
Beginning Date:
90.52
Ending Stage in Treatise Usage:
Upper Cretaceous (Upper Turonian)
Ending International Stage:
Turonian
Fraction Up In Ending Stage:
100
Ending Date:
89.39
Description
Small, compressed to square-whorled, involute to rather evolute, prominent keel finely or coarsely serrate according to the ribbing, ribs sharp at first but may be flat on outer whorls, springing in pairs from weak umbilical tubercles or intercalated, outer ventrolateral clavi on all ribs and inner at least at some growth stage
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Ammonitida
Suborder:
Ammonitina
Superfamily:
Acanthocerataceae
Family:
Collignoniceratidae
Subfamily:
Collignoniceratinae
Formal Genus Name and Reference:
Subprionocyclus SHIMIZU, 1932, p. 2
Type Species:
Prionocyclus hitchinensis BILLINGHURST, 1927, p. 516, OD
Images
(Click to enlarge in a new window)
F IG . 141,1a,b. *S. hitchinensis (BILLINGHURST), England; ×EINITZ 1 (Wright, 1979).—FIG. 141,1c,d. S. neptuni (G ), England; c, ×1; d, enlarged (Woods, 1896).
Synonyms
Oregoniceras, Ledoceras
Geographic Distribution
western Europe, Angola, Japan, California, Oregon, Brazil
Age Range
Beginning Stage in Treatise Usage:
Upper Cretaceous (Upper Turonian)
Beginning International Stage:
Turonian
Fraction Up In Beginning Stage:
75
Beginning Date:
90.52
Ending Stage in Treatise Usage:
Upper Cretaceous (Upper Turonian)
Ending International Stage:
Turonian
Fraction Up In Ending Stage:
100
Ending Date:
89.39
Description
Small, compressed to square-whorled, involute to rather evolute, prominent keel finely or coarsely serrate according to the ribbing, ribs sharp at first but may be flat on outer whorls, springing in pairs from weak umbilical tubercles or intercalated, outer ventrolateral clavi on all ribs and inner at least at some growth stage