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Hammatoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Eoderocerataceae
Family:
Hammatoceratidae
Formal Genus Name and Reference:
Hammatoceras HYATT, 1867
Type Species:
* Am. insignis Zieten, 1831, SD BUCKMAN, 1887
Images
(Click to enlarge in a new window)
Fig. 307, la,b. H. pachu (Buck.) (type of Pachammatoceras), * (595*).-Fig. 307,1c-e. *H. insigne (Zieten), Ger., * (742*)
Synonyms
Geographic Distribution
Eu.-N. Afr.-Bureya Basin-Indon.-Can.-S.Am.
Age Range
Beginning Stage in Treatise Usage:
U.Toarc.(jurense z.)
Beginning International Stage:
Toarcian
Fraction Up In Beginning Stage:
50
Beginning Date:
179.45
Ending Stage in Treatise Usage:
U.Toarc.(jurense z.)
Ending International Stage:
Toarcian
Fraction Up In Ending Stage:
100
Ending Date:
174.7
Description
Coiling moderately involute or evolute, whorl section subtriangular, primary ribs short, secondary ribs long, branching from near umbilical margin, usually from a tubercle, outer whorl becoming smooth.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Eoderocerataceae
Family:
Hammatoceratidae
Formal Genus Name and Reference:
Hammatoceras HYATT, 1867
Type Species:
* Am. insignis Zieten, 1831, SD BUCKMAN, 1887
Images
(Click to enlarge in a new window)
Fig. 307, la,b. H. pachu (Buck.) (type of Pachammatoceras), * (595*).-Fig. 307,1c-e. *H. insigne (Zieten), Ger., * (742*)
Synonyms
Geographic Distribution
Eu.-N. Afr.-Bureya Basin-Indon.-Can.-S.Am.
Age Range
Beginning Stage in Treatise Usage:
U.Toarc.(jurense z.)
Beginning International Stage:
Toarcian
Fraction Up In Beginning Stage:
50
Beginning Date:
179.45
Ending Stage in Treatise Usage:
U.Toarc.(jurense z.)
Ending International Stage:
Toarcian
Fraction Up In Ending Stage:
100
Ending Date:
174.7
Description
Coiling moderately involute or evolute, whorl section subtriangular, primary ribs short, secondary ribs long, branching from near umbilical margin, usually from a tubercle, outer whorl becoming smooth.