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Prionocycloceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Ammonitida
Suborder:
Ammonitina
Superfamily:
Acanthocerataceae
Family:
Collignoniceratidae
Subfamily:
Collignoniceratinae
Formal Genus Name and Reference:
Prionocycloceras SPATH, 1926a, p. 80
Type Species:
Prionocyclus guayabanus GERHARDT, 1897b, p. 197, OD
Images
(Click to enlarge in a new window)
Fig. 142, 2a, b. *P. guayabanum (Gerhardt), Colombia, X 1 (Gerhardt, 1897b)
Synonyms
Donjuaniceras
Geographic Distribution
Spain, Armenia, northern Africa, Madagascar, Texas, Venezuela, Colombia, Brazil
Age Range
Beginning Stage in Treatise Usage:
Upper Cretaceous (Coniacian)
Beginning International Stage:
Coniacian
Fraction Up In Beginning Stage:
0
Beginning Date:
89.39
Ending Stage in Treatise Usage:
Upper Cretaceous (Coniacian)
Ending International Stage:
Coniacian
Fraction Up In Ending Stage:
100
Ending Date:
85.7
Description
Evolute, whorl section more or less rectangular, with angular to sharply rounded shoulders, keel mainly distinct with grooves on either side but may weaken on outer whorls, keel with crenulations more numerous than ribs, ribs generally simple but may be intercalated, typically distant, rursiradiate at shoulder, strongly projected on venter, crossing keel as riblets, ventrolateral tubercles may be double, but inner ones dominant and enlarging into a septate horn
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:
Prionocycloceras SPATH, 1926a, p. 80
Type Species:
Prionocyclus guayabanus GERHARDT, 1897b, p. 197, OD
Images
(Click to enlarge in a new window)
Fig. 142, 2a, b. *P. guayabanum (Gerhardt), Colombia, X 1 (Gerhardt, 1897b)
Synonyms
Donjuaniceras
Geographic Distribution
Spain, Armenia, northern Africa, Madagascar, Texas, Venezuela, Colombia, Brazil
Age Range
Beginning Stage in Treatise Usage:
Upper Cretaceous (Coniacian)
Beginning International Stage:
Coniacian
Fraction Up In Beginning Stage:
0
Beginning Date:
89.39
Ending Stage in Treatise Usage:
Upper Cretaceous (Coniacian)
Ending International Stage:
Coniacian
Fraction Up In Ending Stage:
100
Ending Date:
85.7
Description
Evolute, whorl section more or less rectangular, with angular to sharply rounded shoulders, keel mainly distinct with grooves on either side but may weaken on outer whorls, keel with crenulations more numerous than ribs, ribs generally simple but may be intercalated, typically distant, rursiradiate at shoulder, strongly projected on venter, crossing keel as riblets, ventrolateral tubercles may be double, but inner ones dominant and enlarging into a septate horn